feat(tui): NVIDIA SAT with nvtop, GPU selection, metrics and chart — v1.0.0

- TUI: duration presets (10m/1h/8h/24h), GPU multi-select checkboxes
- nvtop launched concurrently with SAT via tea.ExecProcess; can reopen or abort
- GPU metrics collected per-second during bee-gpu-stress (temp/usage/power/clock)
- Outputs: gpu-metrics.csv, gpu-metrics.html (offline SVG), gpu-metrics-term.txt
- Terminal chart: asciigraph-style line chart with box-drawing chars and ANSI colours
- AUDIT_VERSION bumped 0.1.1 → 1.0.0; nvtop added to ISO package list
- runtime-flows.md updated with full NVIDIA SAT TUI flow documentation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/app/app.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"log/slog"
@@ -71,8 +72,10 @@ type toolManager interface {
 
 type satRunner interface {
 	RunNvidiaAcceptancePack(baseDir string) (string, error)
+	RunNvidiaAcceptancePackWithOptions(ctx context.Context, baseDir string, durationSec int, sizeMB int, gpuIndices []int) (string, error)
 	RunMemoryAcceptancePack(baseDir string) (string, error)
 	RunStorageAcceptancePack(baseDir string) (string, error)
+	ListNvidiaGPUs() ([]platform.NvidiaGPU, error)
 }
 
 type runtimeChecker interface {
@@ -395,6 +398,29 @@ func (a *App) RunNvidiaAcceptancePackResult(baseDir string) (ActionResult, error
 	return ActionResult{Title: "NVIDIA SAT", Body: body}, err
 }
 
+func (a *App) ListNvidiaGPUs() ([]platform.NvidiaGPU, error) {
+	return a.sat.ListNvidiaGPUs()
+}
+
+func (a *App) RunNvidiaAcceptancePackWithOptions(ctx context.Context, baseDir string, durationSec int, sizeMB int, gpuIndices []int) (ActionResult, error) {
+	if strings.TrimSpace(baseDir) == "" {
+		baseDir = DefaultSATBaseDir
+	}
+	path, err := a.sat.RunNvidiaAcceptancePackWithOptions(ctx, baseDir, durationSec, sizeMB, gpuIndices)
+	body := "Archive written."
+	if path != "" {
+		body = "Archive written to " + path
+	}
+	// Include terminal chart if available (runDir = archive path without .tar.gz).
+	if path != "" {
+		termPath := filepath.Join(strings.TrimSuffix(path, ".tar.gz"), "gpu-metrics-term.txt")
+		if chart, readErr := os.ReadFile(termPath); readErr == nil && len(chart) > 0 {
+			body += "\n\n" + string(chart)
+		}
+	}
+	return ActionResult{Title: "NVIDIA SAT", Body: body}, err
+}
+
 func (a *App) RunMemoryAcceptancePack(baseDir string) (string, error) {
 	if strings.TrimSpace(baseDir) == "" {
 		baseDir = DefaultSATBaseDir

audit/internal/app/app_test.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"os"
@@ -105,6 +106,14 @@ func (f fakeSAT) RunNvidiaAcceptancePack(baseDir string) (string, error) {
 	return f.runNvidiaFn(baseDir)
 }
 
+func (f fakeSAT) RunNvidiaAcceptancePackWithOptions(_ context.Context, baseDir string, _ int, _ int, _ []int) (string, error) {
+	return f.runNvidiaFn(baseDir)
+}
+
+func (f fakeSAT) ListNvidiaGPUs() ([]platform.NvidiaGPU, error) {
+	return nil, nil
+}
+
 func (f fakeSAT) RunMemoryAcceptancePack(baseDir string) (string, error) {
 	return f.runMemoryFn(baseDir)
 }

audit/internal/platform/gpu_metrics.go

@@ -0,0 +1,577 @@
+package platform
+
+import (
+	"bytes"
+	"fmt"
+	"math"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// GPUMetricRow is one telemetry sample from nvidia-smi during a stress test.
+type GPUMetricRow struct {
+	ElapsedSec float64
+	GPUIndex   int
+	TempC      float64
+	UsagePct   float64
+	PowerW     float64
+	ClockMHz   float64
+}
+
+// sampleGPUMetrics runs nvidia-smi once and returns current metrics for each GPU.
+func sampleGPUMetrics(gpuIndices []int) ([]GPUMetricRow, error) {
+	args := []string{
+		"--query-gpu=index,temperature.gpu,utilization.gpu,power.draw,clocks.current.graphics",
+		"--format=csv,noheader,nounits",
+	}
+	if len(gpuIndices) > 0 {
+		ids := make([]string, len(gpuIndices))
+		for i, idx := range gpuIndices {
+			ids[i] = strconv.Itoa(idx)
+		}
+		args = append([]string{"--id=" + strings.Join(ids, ",")}, args...)
+	}
+	out, err := exec.Command("nvidia-smi", args...).Output()
+	if err != nil {
+		return nil, err
+	}
+	var rows []GPUMetricRow
+	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		parts := strings.Split(line, ", ")
+		if len(parts) < 5 {
+			continue
+		}
+		idx, _ := strconv.Atoi(strings.TrimSpace(parts[0]))
+		rows = append(rows, GPUMetricRow{
+			GPUIndex: idx,
+			TempC:    parseGPUFloat(parts[1]),
+			UsagePct: parseGPUFloat(parts[2]),
+			PowerW:   parseGPUFloat(parts[3]),
+			ClockMHz: parseGPUFloat(parts[4]),
+		})
+	}
+	return rows, nil
+}
+
+func parseGPUFloat(s string) float64 {
+	s = strings.TrimSpace(s)
+	if s == "N/A" || s == "[Not Supported]" || s == "" {
+		return 0
+	}
+	v, _ := strconv.ParseFloat(s, 64)
+	return v
+}
+
+// WriteGPUMetricsCSV writes collected rows as a CSV file.
+func WriteGPUMetricsCSV(path string, rows []GPUMetricRow) error {
+	var b bytes.Buffer
+	b.WriteString("elapsed_sec,gpu_index,temperature_c,usage_pct,power_w,clock_mhz\n")
+	for _, r := range rows {
+		fmt.Fprintf(&b, "%.1f,%d,%.1f,%.1f,%.1f,%.0f\n",
+			r.ElapsedSec, r.GPUIndex, r.TempC, r.UsagePct, r.PowerW, r.ClockMHz)
+	}
+	return os.WriteFile(path, b.Bytes(), 0644)
+}
+
+// WriteGPUMetricsHTML writes a standalone HTML file with one SVG chart per GPU.
+func WriteGPUMetricsHTML(path string, rows []GPUMetricRow) error {
+	// Group by GPU index preserving order.
+	seen := make(map[int]bool)
+	var order []int
+	gpuMap := make(map[int][]GPUMetricRow)
+	for _, r := range rows {
+		if !seen[r.GPUIndex] {
+			seen[r.GPUIndex] = true
+			order = append(order, r.GPUIndex)
+		}
+		gpuMap[r.GPUIndex] = append(gpuMap[r.GPUIndex], r)
+	}
+
+	var svgs strings.Builder
+	for _, gpuIdx := range order {
+		svgs.WriteString(drawGPUChartSVG(gpuMap[gpuIdx], gpuIdx))
+		svgs.WriteString("\n")
+	}
+
+	ts := time.Now().UTC().Format("2006-01-02 15:04:05 UTC")
+	html := fmt.Sprintf(`<!DOCTYPE html>
+<html><head>
+<meta charset="utf-8">
+<title>GPU Stress Test Metrics</title>
+<style>
+body { font-family: sans-serif; background: #f0f0f0; margin: 0; padding: 20px; }
+h1 { text-align: center; color: #333; margin: 0 0 8px; }
+p  { text-align: center; color: #888; font-size: 13px; margin: 0 0 24px; }
+</style>
+</head><body>
+<h1>GPU Stress Test Metrics</h1>
+<p>Generated %s</p>
+%s
+</body></html>`, ts, svgs.String())
+
+	return os.WriteFile(path, []byte(html), 0644)
+}
+
+// drawGPUChartSVG generates a self-contained SVG chart for one GPU.
+func drawGPUChartSVG(rows []GPUMetricRow, gpuIdx int) string {
+	// Layout
+	const W, H = 960, 520
+	const plotX1 = 120 // usage axis / chart left border
+	const plotX2 = 840 // power axis / chart right border
+	const plotY1 = 70  // top
+	const plotY2 = 465 // bottom  (PH = 395)
+	const PW = plotX2 - plotX1
+	const PH = plotY2 - plotY1
+	// Outer axes
+	const tempAxisX = 60  // temp axis line
+	const clockAxisX = 900 // clock axis line
+
+	colors := [4]string{"#e74c3c", "#3498db", "#2ecc71", "#f39c12"}
+	seriesLabel := [4]string{
+		fmt.Sprintf("GPU %d Temp (°C)", gpuIdx),
+		fmt.Sprintf("GPU %d Usage (%%)", gpuIdx),
+		fmt.Sprintf("GPU %d Power (W)", gpuIdx),
+		fmt.Sprintf("GPU %d Clock (MHz)", gpuIdx),
+	}
+	axisLabel := [4]string{"Temperature (°C)", "GPU Usage (%)", "Power (W)", "Clock (MHz)"}
+
+	// Extract series
+	t := make([]float64, len(rows))
+	vals := [4][]float64{}
+	for i := range vals {
+		vals[i] = make([]float64, len(rows))
+	}
+	for i, r := range rows {
+		t[i] = r.ElapsedSec
+		vals[0][i] = r.TempC
+		vals[1][i] = r.UsagePct
+		vals[2][i] = r.PowerW
+		vals[3][i] = r.ClockMHz
+	}
+
+	tMin, tMax := gpuMinMax(t)
+	type axisScale struct {
+		ticks    []float64
+		min, max float64
+	}
+	var axes [4]axisScale
+	for i := 0; i < 4; i++ {
+		mn, mx := gpuMinMax(vals[i])
+		tks := gpuNiceTicks(mn, mx, 8)
+		axes[i] = axisScale{ticks: tks, min: tks[0], max: tks[len(tks)-1]}
+	}
+
+	xv := func(tv float64) float64 {
+		if tMax == tMin {
+			return float64(plotX1)
+		}
+		return float64(plotX1) + (tv-tMin)/(tMax-tMin)*float64(PW)
+	}
+	yv := func(v float64, ai int) float64 {
+		a := axes[ai]
+		if a.max == a.min {
+			return float64(plotY1 + PH/2)
+		}
+		return float64(plotY2) - (v-a.min)/(a.max-a.min)*float64(PH)
+	}
+
+	var b strings.Builder
+
+	fmt.Fprintf(&b, `<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d"`+
+		` style="background:#fff;border-radius:8px;display:block;margin:0 auto 24px;`+
+		`box-shadow:0 2px 12px rgba(0,0,0,.12)">`+"\n", W, H)
+
+	// Title
+	fmt.Fprintf(&b, `<text x="%d" y="22" text-anchor="middle" font-family="sans-serif"`+
+		` font-size="14" font-weight="bold" fill="#333">GPU Stress Test Metrics — GPU %d</text>`+"\n",
+		plotX1+PW/2, gpuIdx)
+
+	// Horizontal grid (align to temp axis ticks)
+	b.WriteString(`<g stroke="#e0e0e0" stroke-width="0.5">` + "\n")
+	for _, tick := range axes[0].ticks {
+		y := yv(tick, 0)
+		if y < float64(plotY1) || y > float64(plotY2) {
+			continue
+		}
+		fmt.Fprintf(&b, `<line x1="%d" y1="%.1f" x2="%d" y2="%.1f"/>`+"\n",
+			plotX1, y, plotX2, y)
+	}
+	// Vertical grid
+	xTicks := gpuNiceTicks(tMin, tMax, 10)
+	for _, tv := range xTicks {
+		x := xv(tv)
+		if x < float64(plotX1) || x > float64(plotX2) {
+			continue
+		}
+		fmt.Fprintf(&b, `<line x1="%.1f" y1="%d" x2="%.1f" y2="%d"/>`+"\n",
+			x, plotY1, x, plotY2)
+	}
+	b.WriteString("</g>\n")
+
+	// Chart border
+	fmt.Fprintf(&b, `<rect x="%d" y="%d" width="%d" height="%d"`+
+		` fill="none" stroke="#333" stroke-width="1"/>`+"\n",
+		plotX1, plotY1, PW, PH)
+
+	// X axis ticks and labels
+	b.WriteString(`<g font-family="sans-serif" font-size="11" fill="#333" text-anchor="middle">` + "\n")
+	for _, tv := range xTicks {
+		x := xv(tv)
+		if x < float64(plotX1) || x > float64(plotX2) {
+			continue
+		}
+		fmt.Fprintf(&b, `<text x="%.1f" y="%d">%s</text>`+"\n", x, plotY2+18, gpuFormatTick(tv))
+		fmt.Fprintf(&b, `<line x1="%.1f" y1="%d" x2="%.1f" y2="%d" stroke="#333" stroke-width="1"/>`+"\n",
+			x, plotY2, x, plotY2+4)
+	}
+	b.WriteString("</g>\n")
+	fmt.Fprintf(&b, `<text x="%d" y="%d" font-family="sans-serif" font-size="13"`+
+		` fill="#333" text-anchor="middle">Time (seconds)</text>`+"\n",
+		plotX1+PW/2, plotY2+38)
+
+	// Y axes: [tempAxisX, plotX1, plotX2, clockAxisX]
+	axisLineX := [4]int{tempAxisX, plotX1, plotX2, clockAxisX}
+	axisRight := [4]bool{false, false, true, true}
+	// Label x positions (for rotated vertical text)
+	axisLabelX := [4]int{10, 68, 868, 950}
+
+	for i := 0; i < 4; i++ {
+		ax := axisLineX[i]
+		right := axisRight[i]
+		color := colors[i]
+
+		// Axis line
+		fmt.Fprintf(&b, `<line x1="%d" y1="%d" x2="%d" y2="%d"`+
+			` stroke="%s" stroke-width="1"/>`+"\n",
+			ax, plotY1, ax, plotY2, color)
+
+		// Ticks and tick labels
+		fmt.Fprintf(&b, `<g font-family="sans-serif" font-size="10" fill="%s">`+"\n", color)
+		for _, tick := range axes[i].ticks {
+			y := yv(tick, i)
+			if y < float64(plotY1) || y > float64(plotY2) {
+				continue
+			}
+			dx := -5
+			textX := ax - 8
+			anchor := "end"
+			if right {
+				dx = 5
+				textX = ax + 8
+				anchor = "start"
+			}
+			fmt.Fprintf(&b, `<line x1="%d" y1="%.1f" x2="%d" y2="%.1f"`+
+				` stroke="%s" stroke-width="1"/>`+"\n",
+				ax, y, ax+dx, y, color)
+			fmt.Fprintf(&b, `<text x="%d" y="%.1f" text-anchor="%s" dy="4">%s</text>`+"\n",
+				textX, y, anchor, gpuFormatTick(tick))
+		}
+		b.WriteString("</g>\n")
+
+		// Axis label (rotated)
+		lx := axisLabelX[i]
+		fmt.Fprintf(&b, `<text transform="translate(%d,%d) rotate(-90)"`+
+			` font-family="sans-serif" font-size="12" fill="%s" text-anchor="middle">%s</text>`+"\n",
+			lx, plotY1+PH/2, color, axisLabel[i])
+	}
+
+	// Data lines
+	for i := 0; i < 4; i++ {
+		var pts strings.Builder
+		for j := range rows {
+			x := xv(t[j])
+			y := yv(vals[i][j], i)
+			if j == 0 {
+				fmt.Fprintf(&pts, "%.1f,%.1f", x, y)
+			} else {
+				fmt.Fprintf(&pts, " %.1f,%.1f", x, y)
+			}
+		}
+		fmt.Fprintf(&b, `<polyline points="%s" fill="none" stroke="%s" stroke-width="1.5"/>`+"\n",
+			pts.String(), colors[i])
+	}
+
+	// Legend
+	const legendY = 42
+	for i := 0; i < 4; i++ {
+		lx := plotX1 + i*(PW/4) + 10
+		fmt.Fprintf(&b, `<line x1="%d" y1="%d" x2="%d" y2="%d"`+
+			` stroke="%s" stroke-width="2"/>`+"\n",
+			lx, legendY, lx+20, legendY, colors[i])
+		fmt.Fprintf(&b, `<text x="%d" y="%d" font-family="sans-serif" font-size="12" fill="#333">%s</text>`+"\n",
+			lx+25, legendY+4, seriesLabel[i])
+	}
+
+	b.WriteString("</svg>\n")
+	return b.String()
+}
+
+const (
+	ansiRed    = "\033[31m"
+	ansiBlue   = "\033[34m"
+	ansiGreen  = "\033[32m"
+	ansiYellow = "\033[33m"
+	ansiReset  = "\033[0m"
+)
+
+const (
+	termChartWidth  = 70
+	termChartHeight = 12
+)
+
+// RenderGPUTerminalChart returns ANSI line charts (asciigraph-style) per GPU.
+// Suitable for display in the TUI screenOutput.
+func RenderGPUTerminalChart(rows []GPUMetricRow) string {
+	seen := make(map[int]bool)
+	var order []int
+	gpuMap := make(map[int][]GPUMetricRow)
+	for _, r := range rows {
+		if !seen[r.GPUIndex] {
+			seen[r.GPUIndex] = true
+			order = append(order, r.GPUIndex)
+		}
+		gpuMap[r.GPUIndex] = append(gpuMap[r.GPUIndex], r)
+	}
+
+	type seriesDef struct {
+		caption string
+		color   string
+		fn      func(GPUMetricRow) float64
+	}
+	defs := []seriesDef{
+		{"Temperature (°C)", ansiRed, func(r GPUMetricRow) float64 { return r.TempC }},
+		{"GPU Usage (%)", ansiBlue, func(r GPUMetricRow) float64 { return r.UsagePct }},
+		{"Power (W)", ansiGreen, func(r GPUMetricRow) float64 { return r.PowerW }},
+		{"Clock (MHz)", ansiYellow, func(r GPUMetricRow) float64 { return r.ClockMHz }},
+	}
+
+	var b strings.Builder
+	for _, gpuIdx := range order {
+		gr := gpuMap[gpuIdx]
+		if len(gr) == 0 {
+			continue
+		}
+		tMax := gr[len(gr)-1].ElapsedSec - gr[0].ElapsedSec
+		fmt.Fprintf(&b, "GPU %d — Stress Test Metrics  (%.0f seconds)\n\n", gpuIdx, tMax)
+		for _, d := range defs {
+			b.WriteString(renderLineChart(extractGPUField(gr, d.fn), d.color, d.caption,
+				termChartHeight, termChartWidth))
+			b.WriteRune('\n')
+		}
+	}
+
+	return strings.TrimRight(b.String(), "\n")
+}
+
+// renderLineChart draws a single time-series line chart using box-drawing characters.
+// Produces output in the style of asciigraph: ╭─╮ │ ╰─╯ with a Y axis and caption.
+func renderLineChart(vals []float64, color, caption string, height, width int) string {
+	if len(vals) == 0 {
+		return caption + "\n"
+	}
+
+	mn, mx := gpuMinMax(vals)
+	if mn == mx {
+		mx = mn + 1
+	}
+
+	// Use the smaller of width or len(vals) to avoid stretching sparse data.
+	w := width
+	if len(vals) < w {
+		w = len(vals)
+	}
+	data := gpuDownsample(vals, w)
+
+	// row[i] = display row index: 0 = top = max value, height = bottom = min value.
+	row := make([]int, w)
+	for i, v := range data {
+		r := int(math.Round((mx - v) / (mx - mn) * float64(height)))
+		if r < 0 {
+			r = 0
+		}
+		if r > height {
+			r = height
+		}
+		row[i] = r
+	}
+
+	// Fill the character grid.
+	grid := make([][]rune, height+1)
+	for i := range grid {
+		grid[i] = make([]rune, w)
+		for j := range grid[i] {
+			grid[i][j] = ' '
+		}
+	}
+	for x := 0; x < w; x++ {
+		r := row[x]
+		if x == 0 {
+			grid[r][0] = '─'
+			continue
+		}
+		p := row[x-1]
+		switch {
+		case r == p:
+			grid[r][x] = '─'
+		case r < p: // value went up (row index decreased toward top)
+			grid[r][x] = '╭'
+			grid[p][x] = '╯'
+			for y := r + 1; y < p; y++ {
+				grid[y][x] = '│'
+			}
+		default: // r > p, value went down
+			grid[p][x] = '╮'
+			grid[r][x] = '╰'
+			for y := p + 1; y < r; y++ {
+				grid[y][x] = '│'
+			}
+		}
+	}
+
+	// Y axis tick labels.
+	ticks := gpuNiceTicks(mn, mx, height/2)
+	tickAtRow := make(map[int]string)
+	labelWidth := 4
+	for _, t := range ticks {
+		r := int(math.Round((mx - t) / (mx - mn) * float64(height)))
+		if r < 0 || r > height {
+			continue
+		}
+		s := gpuFormatTick(t)
+		tickAtRow[r] = s
+		if len(s) > labelWidth {
+			labelWidth = len(s)
+		}
+	}
+
+	var b strings.Builder
+	for r := 0; r <= height; r++ {
+		label := tickAtRow[r]
+		fmt.Fprintf(&b, "%*s", labelWidth, label)
+		switch {
+		case label != "":
+			b.WriteRune('┤')
+		case r == height:
+			b.WriteRune('┼')
+		default:
+			b.WriteRune('│')
+		}
+		b.WriteString(color)
+		b.WriteString(string(grid[r]))
+		b.WriteString(ansiReset)
+		b.WriteRune('\n')
+	}
+
+	// Bottom axis.
+	b.WriteString(strings.Repeat(" ", labelWidth))
+	b.WriteRune('└')
+	b.WriteString(strings.Repeat("─", w))
+	b.WriteRune('\n')
+
+	// Caption centered under the chart.
+	if caption != "" {
+		total := labelWidth + 1 + w
+		if pad := (total - len(caption)) / 2; pad > 0 {
+			b.WriteString(strings.Repeat(" ", pad))
+		}
+		b.WriteString(caption)
+		b.WriteRune('\n')
+	}
+
+	return b.String()
+}
+
+func extractGPUField(rows []GPUMetricRow, fn func(GPUMetricRow) float64) []float64 {
+	v := make([]float64, len(rows))
+	for i, r := range rows {
+		v[i] = fn(r)
+	}
+	return v
+}
+
+// gpuDownsample averages vals into w buckets (or nearest-neighbor upsamples if len(vals) < w).
+func gpuDownsample(vals []float64, w int) []float64 {
+	n := len(vals)
+	if n == 0 {
+		return make([]float64, w)
+	}
+	result := make([]float64, w)
+	if n >= w {
+		counts := make([]int, w)
+		for i, v := range vals {
+			bucket := i * w / n
+			if bucket >= w {
+				bucket = w - 1
+			}
+			result[bucket] += v
+			counts[bucket]++
+		}
+		for i := range result {
+			if counts[i] > 0 {
+				result[i] /= float64(counts[i])
+			}
+		}
+	} else {
+		// Nearest-neighbour upsample.
+		for i := range result {
+			src := i * (n - 1) / (w - 1)
+			if src >= n {
+				src = n - 1
+			}
+			result[i] = vals[src]
+		}
+	}
+	return result
+}
+
+func gpuMinMax(vals []float64) (float64, float64) {
+	if len(vals) == 0 {
+		return 0, 1
+	}
+	mn, mx := vals[0], vals[0]
+	for _, v := range vals[1:] {
+		if v < mn {
+			mn = v
+		}
+		if v > mx {
+			mx = v
+		}
+	}
+	return mn, mx
+}
+
+func gpuNiceTicks(mn, mx float64, targetCount int) []float64 {
+	if mn == mx {
+		mn -= 1
+		mx += 1
+	}
+	r := mx - mn
+	step := math.Pow(10, math.Floor(math.Log10(r/float64(targetCount))))
+	for _, f := range []float64{1, 2, 5, 10} {
+		if r/(f*step) <= float64(targetCount)*1.5 {
+			step = f * step
+			break
+		}
+	}
+	lo := math.Floor(mn/step) * step
+	hi := math.Ceil(mx/step) * step
+	var ticks []float64
+	for v := lo; v <= hi+step*0.001; v += step {
+		ticks = append(ticks, math.Round(v*1e9)/1e9)
+	}
+	return ticks
+}
+
+func gpuFormatTick(v float64) string {
+	if v == math.Trunc(v) {
+		return strconv.Itoa(int(v))
+	}
+	return strconv.FormatFloat(v, 'f', 1, 64)
+}

audit/internal/platform/sat.go

@@ -3,6 +3,7 @@ package platform
 import (
 	"archive/tar"
 	"compress/gzip"
+	"context"
 	"fmt"
 	"io"
 	"os"
@@ -14,10 +15,55 @@ import (
 	"time"
 )
 
+// NvidiaGPU holds basic GPU info from nvidia-smi.
+type NvidiaGPU struct {
+	Index    int
+	Name     string
+	MemoryMB int
+}
+
+// ListNvidiaGPUs returns GPUs visible to nvidia-smi.
+func (s *System) ListNvidiaGPUs() ([]NvidiaGPU, error) {
+	out, err := exec.Command("nvidia-smi",
+		"--query-gpu=index,name,memory.total",
+		"--format=csv,noheader,nounits").Output()
+	if err != nil {
+		return nil, fmt.Errorf("nvidia-smi: %w", err)
+	}
+	var gpus []NvidiaGPU
+	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		parts := strings.SplitN(line, ", ", 3)
+		if len(parts) != 3 {
+			continue
+		}
+		idx, err := strconv.Atoi(strings.TrimSpace(parts[0]))
+		if err != nil {
+			continue
+		}
+		memMB, _ := strconv.Atoi(strings.TrimSpace(parts[2]))
+		gpus = append(gpus, NvidiaGPU{
+			Index:    idx,
+			Name:     strings.TrimSpace(parts[1]),
+			MemoryMB: memMB,
+		})
+	}
+	return gpus, nil
+}
+
 func (s *System) RunNvidiaAcceptancePack(baseDir string) (string, error) {
 	return runAcceptancePack(baseDir, "gpu-nvidia", nvidiaSATJobs())
 }
 
+// RunNvidiaAcceptancePackWithOptions runs the NVIDIA SAT with explicit duration,
+// GPU memory size, and GPU index selection. ctx cancellation kills the running job.
+func (s *System) RunNvidiaAcceptancePackWithOptions(ctx context.Context, baseDir string, durationSec int, sizeMB int, gpuIndices []int) (string, error) {
+	return runAcceptancePackCtx(ctx, baseDir, "gpu-nvidia", nvidiaSATJobsWithOptions(durationSec, sizeMB, gpuIndices))
+}
+
 func (s *System) RunMemoryAcceptancePack(baseDir string) (string, error) {
 	sizeMB := envInt("BEE_MEMTESTER_SIZE_MB", 128)
 	passes := envInt("BEE_MEMTESTER_PASSES", 1)
@@ -84,8 +130,11 @@ func (s *System) RunStorageAcceptancePack(baseDir string) (string, error) {
 }
 
 type satJob struct {
-	name string
+	name       string
-	cmd  []string
+	cmd        []string
+	env        []string // extra env vars (appended to os.Environ)
+	collectGPU bool     // collect GPU metrics via nvidia-smi while this job runs
+	gpuIndices []int    // GPU indices to collect metrics for (empty = all)
 }
 
 type satStats struct {
@@ -147,6 +196,109 @@ func runAcceptancePack(baseDir, prefix string, jobs []satJob) (string, error) {
 	return archive, nil
 }
 
+func nvidiaSATJobsWithOptions(durationSec, sizeMB int, gpuIndices []int) []satJob {
+	var env []string
+	if len(gpuIndices) > 0 {
+		ids := make([]string, len(gpuIndices))
+		for i, idx := range gpuIndices {
+			ids[i] = strconv.Itoa(idx)
+		}
+		env = []string{"CUDA_VISIBLE_DEVICES=" + strings.Join(ids, ",")}
+	}
+	return []satJob{
+		{name: "01-nvidia-smi-q.log", cmd: []string{"nvidia-smi", "-q"}},
+		{name: "02-dmidecode-baseboard.log", cmd: []string{"dmidecode", "-t", "baseboard"}},
+		{name: "03-dmidecode-system.log", cmd: []string{"dmidecode", "-t", "system"}},
+		{name: "04-nvidia-bug-report.log", cmd: []string{"nvidia-bug-report.sh", "--output-file", "{{run_dir}}/nvidia-bug-report.log"}},
+		{
+			name:       "05-bee-gpu-stress.log",
+			cmd:        []string{"bee-gpu-stress", "--seconds", strconv.Itoa(durationSec), "--size-mb", strconv.Itoa(sizeMB)},
+			env:        env,
+			collectGPU: true,
+			gpuIndices: gpuIndices,
+		},
+	}
+}
+
+func runAcceptancePackCtx(ctx context.Context, baseDir, prefix string, jobs []satJob) (string, error) {
+	if baseDir == "" {
+		baseDir = "/var/log/bee-sat"
+	}
+	ts := time.Now().UTC().Format("20060102-150405")
+	runDir := filepath.Join(baseDir, prefix+"-"+ts)
+	if err := os.MkdirAll(runDir, 0755); err != nil {
+		return "", err
+	}
+	verboseLog := filepath.Join(runDir, "verbose.log")
+
+	var summary strings.Builder
+	stats := satStats{}
+	fmt.Fprintf(&summary, "run_at_utc=%s\n", time.Now().UTC().Format(time.RFC3339))
+	for _, job := range jobs {
+		if ctx.Err() != nil {
+			break
+		}
+		cmd := make([]string, 0, len(job.cmd))
+		for _, arg := range job.cmd {
+			cmd = append(cmd, strings.ReplaceAll(arg, "{{run_dir}}", runDir))
+		}
+
+		var out []byte
+		var err error
+
+		if job.collectGPU {
+			out, err = runSATCommandWithMetrics(ctx, verboseLog, job.name, cmd, job.env, job.gpuIndices, runDir)
+		} else {
+			out, err = runSATCommandCtx(ctx, verboseLog, job.name, cmd, job.env)
+		}
+
+		if writeErr := os.WriteFile(filepath.Join(runDir, job.name), out, 0644); writeErr != nil {
+			return "", writeErr
+		}
+		status, rc := classifySATResult(job.name, out, err)
+		stats.Add(status)
+		key := strings.TrimSuffix(strings.TrimPrefix(job.name, "0"), ".log")
+		fmt.Fprintf(&summary, "%s_rc=%d\n", key, rc)
+		fmt.Fprintf(&summary, "%s_status=%s\n", key, status)
+	}
+	writeSATStats(&summary, stats)
+	if err := os.WriteFile(filepath.Join(runDir, "summary.txt"), []byte(summary.String()), 0644); err != nil {
+		return "", err
+	}
+
+	archive := filepath.Join(baseDir, prefix+"-"+ts+".tar.gz")
+	if err := createTarGz(archive, runDir); err != nil {
+		return "", err
+	}
+	return archive, nil
+}
+
+func runSATCommandCtx(ctx context.Context, verboseLog, name string, cmd []string, env []string) ([]byte, error) {
+	start := time.Now().UTC()
+	appendSATVerboseLog(verboseLog,
+		fmt.Sprintf("[%s] start %s", start.Format(time.RFC3339), name),
+		"cmd: "+strings.Join(cmd, " "),
+	)
+
+	c := exec.CommandContext(ctx, cmd[0], cmd[1:]...)
+	if len(env) > 0 {
+		c.Env = append(os.Environ(), env...)
+	}
+	out, err := c.CombinedOutput()
+
+	rc := 0
+	if err != nil {
+		rc = 1
+	}
+	appendSATVerboseLog(verboseLog,
+		fmt.Sprintf("[%s] finish %s", time.Now().UTC().Format(time.RFC3339), name),
+		fmt.Sprintf("rc: %d", rc),
+		fmt.Sprintf("duration_ms: %d", time.Since(start).Milliseconds()),
+		"",
+	)
+	return out, err
+}
+
 func listStorageDevices() ([]string, error) {
 	out, err := exec.Command("lsblk", "-dn", "-o", "NAME,TYPE").Output()
 	if err != nil {
@@ -251,6 +403,51 @@ func runSATCommand(verboseLog, name string, cmd []string) ([]byte, error) {
 	return out, err
 }
 
+// runSATCommandWithMetrics runs a command while collecting GPU metrics in the background.
+// On completion it writes gpu-metrics.csv and gpu-metrics.html into runDir.
+func runSATCommandWithMetrics(ctx context.Context, verboseLog, name string, cmd []string, env []string, gpuIndices []int, runDir string) ([]byte, error) {
+	stopCh := make(chan struct{})
+	doneCh := make(chan struct{})
+	var metricRows []GPUMetricRow
+	start := time.Now()
+
+	go func() {
+		defer close(doneCh)
+		ticker := time.NewTicker(time.Second)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-stopCh:
+				return
+			case <-ticker.C:
+				samples, err := sampleGPUMetrics(gpuIndices)
+				if err != nil {
+					continue
+				}
+				elapsed := time.Since(start).Seconds()
+				for i := range samples {
+					samples[i].ElapsedSec = elapsed
+				}
+				metricRows = append(metricRows, samples...)
+			}
+		}
+	}()
+
+	out, err := runSATCommandCtx(ctx, verboseLog, name, cmd, env)
+
+	close(stopCh)
+	<-doneCh
+
+	if len(metricRows) > 0 {
+		_ = WriteGPUMetricsCSV(filepath.Join(runDir, "gpu-metrics.csv"), metricRows)
+		_ = WriteGPUMetricsHTML(filepath.Join(runDir, "gpu-metrics.html"), metricRows)
+		chart := RenderGPUTerminalChart(metricRows)
+		_ = os.WriteFile(filepath.Join(runDir, "gpu-metrics-term.txt"), []byte(chart), 0644)
+	}
+
+	return out, err
+}
+
 func appendSATVerboseLog(path string, lines ...string) {
 	if path == "" {
 		return

audit/internal/tui/messages.go

@@ -27,3 +27,16 @@ type exportTargetsMsg struct {
 type bannerMsg struct {
 	text string
 }
+
+type nvidiaGPUsMsg struct {
+	gpus []platform.NvidiaGPU
+	err  error
+}
+
+type nvtopClosedMsg struct{}
+
+type nvidiaSATDoneMsg struct {
+	title string
+	body  string
+	err   error
+}

audit/internal/tui/screen_acceptance.go

@@ -10,7 +10,7 @@ func (m model) handleAcceptanceMenu() (tea.Model, tea.Cmd) {
 	}
 	switch m.cursor {
 	case 0:
-		m.pendingAction = actionRunNvidiaSAT
+		return m.enterNvidiaSATSetup()
 	case 1:
 		m.pendingAction = actionRunMemorySAT
 	case 2:

audit/internal/tui/screen_nvidia_sat.go

@@ -0,0 +1,238 @@
+package tui
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"bee/audit/internal/platform"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+var nvidiaDurationOptions = []struct {
+	label   string
+	seconds int
+}{
+	{"10 minutes", 600},
+	{"1 hour", 3600},
+	{"8 hours", 28800},
+	{"24 hours", 86400},
+}
+
+// enterNvidiaSATSetup resets the setup screen and starts loading GPU list.
+func (m model) enterNvidiaSATSetup() (tea.Model, tea.Cmd) {
+	m.screen = screenNvidiaSATSetup
+	m.nvidiaGPUs = nil
+	m.nvidiaGPUSel = nil
+	m.nvidiaDurIdx = 0
+	m.nvidiaSATCursor = 0
+	m.busy = true
+	m.busyTitle = "NVIDIA SAT"
+	return m, func() tea.Msg {
+		gpus, err := m.app.ListNvidiaGPUs()
+		return nvidiaGPUsMsg{gpus: gpus, err: err}
+	}
+}
+
+// handleNvidiaGPUsMsg processes the GPU list response.
+func (m model) handleNvidiaGPUsMsg(msg nvidiaGPUsMsg) (tea.Model, tea.Cmd) {
+	m.busy = false
+	m.busyTitle = ""
+	if msg.err != nil {
+		m.title = "NVIDIA SAT"
+		m.body = fmt.Sprintf("Failed to list GPUs: %v", msg.err)
+		m.prevScreen = screenAcceptance
+		m.screen = screenOutput
+		return m, nil
+	}
+	m.nvidiaGPUs = msg.gpus
+	m.nvidiaGPUSel = make([]bool, len(msg.gpus))
+	for i := range m.nvidiaGPUSel {
+		m.nvidiaGPUSel[i] = true // all selected by default
+	}
+	m.nvidiaSATCursor = 0
+	return m, nil
+}
+
+// updateNvidiaSATSetup handles keys on the setup screen.
+func (m model) updateNvidiaSATSetup(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
+	numDur := len(nvidiaDurationOptions)
+	numGPU := len(m.nvidiaGPUs)
+	totalItems := numDur + numGPU + 2 // +2: Start, Cancel
+	switch msg.String() {
+	case "up", "k":
+		if m.nvidiaSATCursor > 0 {
+			m.nvidiaSATCursor--
+		}
+	case "down", "j":
+		if m.nvidiaSATCursor < totalItems-1 {
+			m.nvidiaSATCursor++
+		}
+	case " ":
+		switch {
+		case m.nvidiaSATCursor < numDur:
+			m.nvidiaDurIdx = m.nvidiaSATCursor
+		case m.nvidiaSATCursor < numDur+numGPU:
+			i := m.nvidiaSATCursor - numDur
+			m.nvidiaGPUSel[i] = !m.nvidiaGPUSel[i]
+		}
+	case "enter":
+		startIdx := numDur + numGPU
+		cancelIdx := startIdx + 1
+		switch {
+		case m.nvidiaSATCursor < numDur:
+			m.nvidiaDurIdx = m.nvidiaSATCursor
+		case m.nvidiaSATCursor < startIdx:
+			i := m.nvidiaSATCursor - numDur
+			m.nvidiaGPUSel[i] = !m.nvidiaGPUSel[i]
+		case m.nvidiaSATCursor == startIdx:
+			return m.startNvidiaSAT()
+		case m.nvidiaSATCursor == cancelIdx:
+			m.screen = screenAcceptance
+			m.cursor = 0
+		}
+	case "esc":
+		m.screen = screenAcceptance
+		m.cursor = 0
+	case "ctrl+c", "q":
+		return m, tea.Quit
+	}
+	return m, nil
+}
+
+// startNvidiaSAT launches the SAT and nvtop.
+func (m model) startNvidiaSAT() (tea.Model, tea.Cmd) {
+	var selectedGPUs []platform.NvidiaGPU
+	for i, sel := range m.nvidiaGPUSel {
+		if sel {
+			selectedGPUs = append(selectedGPUs, m.nvidiaGPUs[i])
+		}
+	}
+	if len(selectedGPUs) == 0 {
+		selectedGPUs = m.nvidiaGPUs // fallback: use all if none explicitly selected
+	}
+
+	sizeMB := 0
+	for _, g := range selectedGPUs {
+		if sizeMB == 0 || g.MemoryMB < sizeMB {
+			sizeMB = g.MemoryMB
+		}
+	}
+	if sizeMB == 0 {
+		sizeMB = 64
+	}
+
+	var gpuIndices []int
+	for _, g := range selectedGPUs {
+		gpuIndices = append(gpuIndices, g.Index)
+	}
+
+	durationSec := nvidiaDurationOptions[m.nvidiaDurIdx].seconds
+
+	ctx, cancel := context.WithCancel(context.Background())
+	m.nvidiaSATCancel = cancel
+	m.nvidiaSATAborted = false
+	m.screen = screenNvidiaSATRunning
+	m.nvidiaSATCursor = 0
+
+	satCmd := func() tea.Msg {
+		result, err := m.app.RunNvidiaAcceptancePackWithOptions(ctx, "", durationSec, sizeMB, gpuIndices)
+		return nvidiaSATDoneMsg{title: result.Title, body: result.Body, err: err}
+	}
+
+	nvtopPath, lookErr := exec.LookPath("nvtop")
+	if lookErr != nil {
+		// nvtop not available: just run the SAT, show running screen
+		return m, satCmd
+	}
+
+	return m, tea.Batch(
+		satCmd,
+		tea.ExecProcess(exec.Command(nvtopPath), func(_ error) tea.Msg {
+			return nvtopClosedMsg{}
+		}),
+	)
+}
+
+// updateNvidiaSATRunning handles keys on the running screen.
+func (m model) updateNvidiaSATRunning(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
+	switch msg.String() {
+	case "o", "O":
+		nvtopPath, err := exec.LookPath("nvtop")
+		if err != nil {
+			return m, nil
+		}
+		return m, tea.ExecProcess(exec.Command(nvtopPath), func(_ error) tea.Msg {
+			return nvtopClosedMsg{}
+		})
+	case "a", "A":
+		if m.nvidiaSATCancel != nil {
+			m.nvidiaSATCancel()
+			m.nvidiaSATCancel = nil
+		}
+		m.nvidiaSATAborted = true
+		m.screen = screenAcceptance
+		m.cursor = 0
+	case "ctrl+c":
+		return m, tea.Quit
+	}
+	return m, nil
+}
+
+// renderNvidiaSATSetup renders the setup screen.
+func renderNvidiaSATSetup(m model) string {
+	var b strings.Builder
+	fmt.Fprintln(&b, "NVIDIA SAT")
+	fmt.Fprintln(&b)
+	fmt.Fprintln(&b, "Duration:")
+	for i, opt := range nvidiaDurationOptions {
+		radio := "( )"
+		if i == m.nvidiaDurIdx {
+			radio = "(*)"
+		}
+		prefix := "  "
+		if m.nvidiaSATCursor == i {
+			prefix = "> "
+		}
+		fmt.Fprintf(&b, "%s%s %s\n", prefix, radio, opt.label)
+	}
+	fmt.Fprintln(&b)
+	if len(m.nvidiaGPUs) == 0 {
+		fmt.Fprintln(&b, "GPUs: (none detected)")
+	} else {
+		fmt.Fprintln(&b, "GPUs:")
+		for i, gpu := range m.nvidiaGPUs {
+			check := "[ ]"
+			if m.nvidiaGPUSel[i] {
+				check = "[x]"
+			}
+			prefix := "  "
+			if m.nvidiaSATCursor == len(nvidiaDurationOptions)+i {
+				prefix = "> "
+			}
+			fmt.Fprintf(&b, "%s%s %d: %s (%d MB)\n", prefix, check, gpu.Index, gpu.Name, gpu.MemoryMB)
+		}
+	}
+	fmt.Fprintln(&b)
+	startIdx := len(nvidiaDurationOptions) + len(m.nvidiaGPUs)
+	startPfx := "  "
+	cancelPfx := "  "
+	if m.nvidiaSATCursor == startIdx {
+		startPfx = "> "
+	}
+	if m.nvidiaSATCursor == startIdx+1 {
+		cancelPfx = "> "
+	}
+	fmt.Fprintf(&b, "%sStart\n", startPfx)
+	fmt.Fprintf(&b, "%sCancel\n", cancelPfx)
+	fmt.Fprintln(&b)
+	b.WriteString("[↑/↓] move  [space] toggle  [enter] select  [esc] cancel\n")
+	return b.String()
+}
+
+// renderNvidiaSATRunning renders the running screen.
+func renderNvidiaSATRunning() string {
+	return "NVIDIA SAT\n\nTest is running...\n\n[o] Open nvtop  [a] Abort test  [ctrl+c] quit\n"
+}

audit/internal/tui/tui_test.go

@@ -255,7 +255,7 @@ func TestOutputScreenReturnsToPreviousScreen(t *testing.T) {
 	}
 }
 
-func TestAcceptanceConfirmFlow(t *testing.T) {
+func TestAcceptanceNvidiaSATOpensSetup(t *testing.T) {
 	t.Parallel()
 
 	m := newTestModel()
@@ -265,17 +265,15 @@ func TestAcceptanceConfirmFlow(t *testing.T) {
 	next, cmd := m.handleAcceptanceMenu()
 	got := next.(model)
 
-	if cmd != nil {
+	if cmd == nil {
-		t.Fatal("expected nil cmd")
+		t.Fatal("expected non-nil cmd (GPU list loader)")
 	}
-	if got.screen != screenConfirm {
+	if got.screen != screenNvidiaSATSetup {
-		t.Fatalf("screen=%q want %q", got.screen, screenConfirm)
+		t.Fatalf("screen=%q want %q", got.screen, screenNvidiaSATSetup)
-	}
-	if got.pendingAction != actionRunNvidiaSAT {
-		t.Fatalf("pendingAction=%q want %q", got.pendingAction, actionRunNvidiaSAT)
 	}
 
-	next, _ = got.updateConfirm(tea.KeyMsg{Type: tea.KeyEsc})
+	// esc from setup returns to acceptance
+	next, _ = got.updateNvidiaSATSetup(tea.KeyMsg{Type: tea.KeyEsc})
 	got = next.(model)
 	if got.screen != screenAcceptance {
 		t.Fatalf("screen after esc=%q want %q", got.screen, screenAcceptance)
@@ -289,7 +287,6 @@ func TestAcceptanceMenuMapsNewTargets(t *testing.T) {
 		cursor int
 		want   actionKind
 	}{
-		{cursor: 0, want: actionRunNvidiaSAT},
 		{cursor: 1, want: actionRunMemorySAT},
 		{cursor: 2, want: actionRunStorageSAT},
 	}

audit/internal/tui/types.go

@@ -1,6 +1,8 @@
 package tui
 
 import (
+	"context"
+
 	"bee/audit/internal/app"
 	"bee/audit/internal/platform"
 	"bee/audit/internal/runtimeenv"
@@ -12,16 +14,18 @@ import (
 type screen string
 
 const (
-	screenMain          screen = "main"
+	screenMain             screen = "main"
-	screenNetwork       screen = "network"
+	screenNetwork          screen = "network"
-	screenInterfacePick screen = "interface_pick"
+	screenInterfacePick    screen = "interface_pick"
-	screenServices      screen = "services"
+	screenServices         screen = "services"
-	screenServiceAction screen = "service_action"
+	screenServiceAction    screen = "service_action"
-	screenAcceptance    screen = "acceptance"
+	screenAcceptance       screen = "acceptance"
-	screenExportTargets screen = "export_targets"
+	screenExportTargets    screen = "export_targets"
-	screenOutput        screen = "output"
+	screenOutput           screen = "output"
-	screenStaticForm    screen = "static_form"
+	screenStaticForm       screen = "static_form"
-	screenConfirm       screen = "confirm"
+	screenConfirm          screen = "confirm"
+	screenNvidiaSATSetup   screen = "nvidia_sat_setup"
+	screenNvidiaSATRunning screen = "nvidia_sat_running"
 )
 
 type actionKind string
@@ -63,6 +67,16 @@ type model struct {
 
 	formFields []formField
 	formIndex  int
+
+	// NVIDIA SAT setup
+	nvidiaGPUs       []platform.NvidiaGPU
+	nvidiaGPUSel     []bool
+	nvidiaDurIdx     int // index into nvidiaDurationOptions
+	nvidiaSATCursor  int
+
+	// NVIDIA SAT running
+	nvidiaSATCancel  context.CancelFunc
+	nvidiaSATAborted bool
 }
 
 type formField struct {

audit/internal/tui/update.go

@@ -87,6 +87,33 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case bannerMsg:
 		m.banner = strings.TrimSpace(msg.text)
 		return m, nil
+	case nvidiaGPUsMsg:
+		return m.handleNvidiaGPUsMsg(msg)
+	case nvtopClosedMsg:
+		// nvtop closed — stay on running screen (or result if SAT is already done)
+		return m, nil
+	case nvidiaSATDoneMsg:
+		if m.nvidiaSATAborted {
+			return m, nil
+		}
+		if m.nvidiaSATCancel != nil {
+			m.nvidiaSATCancel()
+			m.nvidiaSATCancel = nil
+		}
+		m.prevScreen = screenAcceptance
+		m.screen = screenOutput
+		m.title = msg.title
+		if msg.err != nil {
+			body := strings.TrimSpace(msg.body)
+			if body == "" {
+				m.body = fmt.Sprintf("ERROR: %v", msg.err)
+			} else {
+				m.body = fmt.Sprintf("%s\n\nERROR: %v", body, msg.err)
+			}
+		} else {
+			m.body = msg.body
+		}
+		return m, nil
 	}
 
 	return m, nil
@@ -104,6 +131,10 @@ func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		return m.updateMenu(msg, len(m.serviceMenu), m.handleServiceActionMenu)
 	case screenAcceptance:
 		return m.updateMenu(msg, 4, m.handleAcceptanceMenu)
+	case screenNvidiaSATSetup:
+		return m.updateNvidiaSATSetup(msg)
+	case screenNvidiaSATRunning:
+		return m.updateNvidiaSATRunning(msg)
 	case screenExportTargets:
 		return m.updateMenu(msg, len(m.targets), m.handleExportTargetsMenu)
 	case screenInterfacePick:

audit/internal/tui/view.go

@@ -43,6 +43,10 @@ func (m model) View() string {
 	case screenConfirm:
 		title, body := m.confirmBody()
 		return renderConfirm(title, body, m.cursor)
+	case screenNvidiaSATSetup:
+		return renderNvidiaSATSetup(m)
+	case screenNvidiaSATRunning:
+		return renderNvidiaSATRunning()
 	case screenOutput:
 		return fmt.Sprintf("%s\n\n%s\n\n[enter/esc] back  [ctrl+c] quit\n", m.title, strings.TrimSpace(m.body))
 	default:

bible-local/architecture/runtime-flows.md

@@ -140,3 +140,34 @@ Acceptance flows:
   - `BEE_GPU_STRESS_SIZE_MB`
   - `BEE_MEMTESTER_SIZE_MB`
   - `BEE_MEMTESTER_PASSES`
+
+## NVIDIA SAT TUI flow (v1.0.0+)
+
+```
+TUI: Acceptance tests → NVIDIA command pack
+  1. screenNvidiaSATSetup
+       a. enumerate GPUs via `nvidia-smi --query-gpu=index,name,memory.total`
+       b. user selects duration preset: 10 min / 1 h / 8 h / 24 h
+       c. user selects GPUs via checkboxes (all selected by default)
+       d. memory size = max(selected GPU memory) — auto-detected, not exposed to user
+  2. Start → screenNvidiaSATRunning
+       a. CUDA_VISIBLE_DEVICES set to selected GPU indices
+       b. tea.Batch: SAT goroutine + tea.ExecProcess(nvtop) launched concurrently
+       c. nvtop occupies full terminal; SAT result queues in background
+       d. [o] reopen nvtop at any time; [a] abort (cancels context → kills bee-gpu-stress)
+  3. GPU metrics collection (during bee-gpu-stress)
+       - background goroutine polls `nvidia-smi` every second
+       - per-second rows: elapsed, GPU index, temp°C, usage%, power W, clock MHz
+       - outputs: gpu-metrics.csv, gpu-metrics.html (offline SVG chart), gpu-metrics-term.txt
+  4. After SAT completes
+       - result shown in screenOutput with terminal line-chart (gpu-metrics-term.txt)
+       - chart is asciigraph-style: box-drawing chars (╭╮╰╯─│), 4 series per GPU,
+         Y axis with ticks, ANSI colours (red=temp, blue=usage, green=power, yellow=clock)
+```
+
+**Critical invariants:**
+- `nvtop` must be in `iso/builder/config/package-lists/bee.list.chroot` (baked into ISO).
+- `bee-gpu-stress` uses `exec.CommandContext` — aborted on cancel.
+- Metric goroutine uses stopCh/doneCh pattern; main goroutine waits `<-doneCh` before reading rows (no mutex needed).
+- If `nvtop` is not found on PATH, SAT still runs without it (graceful degradation).
+- SVG chart is fully offline: no JS, no external CSS, pure inline SVG.

iso/builder/VERSIONS

@@ -2,4 +2,4 @@ DEBIAN_VERSION=12
 DEBIAN_KERNEL_ABI=6.1.0-43
 NVIDIA_DRIVER_VERSION=590.48.01
 GO_VERSION=1.24.0
-AUDIT_VERSION=0.1.1
+AUDIT_VERSION=1.0.0

iso/builder/config/package-lists/bee.list.chroot

@@ -27,6 +27,7 @@ less
 vim-tiny
 mc
 htop
+nvtop
 sudo
 zstd
 mstflint