fix: GPU ID collision between Intel and NVIDIA collectors (#1522)

- Prefix Intel GPU ID as i0 to avoid NVML/NVIDIA index IDs like 0
- Update frontend GPU engines chart to select a GPU by id instead of
assuming g[0]
- Adjust tests to use the new Intel GPU id

agent/gpu.go

@@ -237,10 +237,11 @@ func (gm *GPUManager) parseAmdData(output []byte) bool {
 		totalMemory, _ := strconv.ParseFloat(v.MemoryTotal, 64)
 		usage, _ := strconv.ParseFloat(v.Usage, 64)
 
-		if _, ok := gm.GpuDataMap[v.ID]; !ok {
-			gm.GpuDataMap[v.ID] = &system.GPUData{Name: v.Name}
+		id := v.ID
+		if _, ok := gm.GpuDataMap[id]; !ok {
+			gm.GpuDataMap[id] = &system.GPUData{Name: v.Name}
 		}
-		gpu := gm.GpuDataMap[v.ID]
+		gpu := gm.GpuDataMap[id]
 		gpu.Temperature, _ = strconv.ParseFloat(v.Temperature, 64)
 		gpu.MemoryUsed = bytesToMegabytes(memoryUsage)
 		gpu.MemoryTotal = bytesToMegabytes(totalMemory)

agent/gpu_intel.go

@@ -27,10 +27,11 @@ func (gm *GPUManager) updateIntelFromStats(sample *intelGpuStats) bool {
 	defer gm.Unlock()
 
 	// only one gpu for now - cmd doesn't provide all by default
-	gpuData, ok := gm.GpuDataMap["0"]
+	id := "i0" // prefix with i to avoid conflicts with nvidia card ids
+	gpuData, ok := gm.GpuDataMap[id]
 	if !ok {
 		gpuData = &system.GPUData{Name: "GPU", Engines: make(map[string]float64)}
-		gm.GpuDataMap["0"] = gpuData
+		gm.GpuDataMap[id] = gpuData
 	}
 
 	gpuData.Power += sample.PowerGPU

agent/gpu_test.go

@@ -1385,7 +1385,7 @@ func TestIntelUpdateFromStats(t *testing.T) {
 	ok := gm.updateIntelFromStats(&sample1)
 	assert.True(t, ok)
 
-	gpu := gm.GpuDataMap["0"]
+	gpu := gm.GpuDataMap["i0"]
 	require.NotNil(t, gpu)
 	assert.Equal(t, "GPU", gpu.Name)
 	assert.EqualValues(t, 10.5, gpu.Power)
@@ -1407,7 +1407,7 @@ func TestIntelUpdateFromStats(t *testing.T) {
 	ok = gm.updateIntelFromStats(&sample2)
 	assert.True(t, ok)
 
-	gpu = gm.GpuDataMap["0"]
+	gpu = gm.GpuDataMap["i0"]
 	require.NotNil(t, gpu)
 	assert.EqualValues(t, 10.5, gpu.Power)
 	assert.EqualValues(t, 30.0, gpu.Engines["Render/3D"]) // 20 + 10
@@ -1446,7 +1446,7 @@ echo "298  295      278  51  2.20  3.12   1675    942   5.75    1   2    9.50
 		t.Fatalf("collectIntelStats error: %v", err)
 	}
 
-	gpu := gm.GpuDataMap["0"]
+	gpu := gm.GpuDataMap["i0"]
 	require.NotNil(t, gpu)
 	// Power should be sum of samples 2-4 (first is skipped): 2.0 + 1.8 + 2.2 = 6.0
 	assert.EqualValues(t, 6.0, gpu.Power)

internal/site/src/components/routes/system.tsx

@@ -409,26 +409,18 @@ export default memo(function SystemDetail({ id }: { id: string }) {
 	if (lastGpus) {
 		// check if there are any GPUs at all
 		hasGpuData = Object.keys(lastGpus).length > 0
-		// check if there are any GPUs with engines
-		for (let i = 0; i < systemStats.length && !hasGpuEnginesData; i++) {
+		// check if there are any GPUs with engines or power data
+		for (let i = 0; i < systemStats.length && (!hasGpuEnginesData || !hasGpuPowerData); i++) {
 			const gpus = systemStats[i].stats?.g
 			if (!gpus) continue
 			for (const id in gpus) {
-				if (gpus[id].e !== undefined) {
+				if (!hasGpuEnginesData && gpus[id].e !== undefined) {
 					hasGpuEnginesData = true
-					break
 				}
-			}
-		}
-		// check if there are any GPUs with power data
-		for (let i = 0; i < systemStats.length && !hasGpuPowerData; i++) {
-			const gpus = systemStats[i].stats?.g
-			if (!gpus) continue
-			for (const id in gpus) {
-				if (gpus[id].p !== undefined || gpus[id].pp !== undefined) {
+				if (!hasGpuPowerData && (gpus[id].p !== undefined || gpus[id].pp !== undefined)) {
 					hasGpuPowerData = true
-					break
 				}
+				if (hasGpuEnginesData && hasGpuPowerData) break
 			}
 		}
 	}
@@ -896,16 +888,30 @@ export default memo(function SystemDetail({ id }: { id: string }) {
 })
 
 function GpuEnginesChart({ chartData }: { chartData: ChartData }) {
-	const dataPoints: DataPoint[] = []
-	const engines = Object.keys(chartData.systemStats?.at(-1)?.stats.g?.[0]?.e ?? {}).sort()
-	for (const engine of engines) {
-		dataPoints.push({
-			label: engine,
-			dataKey: ({ stats }: SystemStatsRecord) => stats?.g?.[0]?.e?.[engine] ?? 0,
-			color: `hsl(${140 + (((engines.indexOf(engine) * 360) / engines.length) % 360)}, 65%, 52%)`,
-			opacity: 0.35,
-		})
+	const { gpuId, engines } = useMemo(() => {
+		for (let i = chartData.systemStats.length - 1; i >= 0; i--) {
+			const gpus = chartData.systemStats[i].stats?.g
+			if (!gpus) continue
+			for (const id in gpus) {
+				if (gpus[id].e) {
+					return { gpuId: id, engines: Object.keys(gpus[id].e).sort() }
 				}
+			}
+		}
+		return { gpuId: null, engines: [] }
+	}, [chartData.systemStats])
+
+	if (!gpuId) {
+		return null
+	}
+
+	const dataPoints: DataPoint[] = engines.map((engine, i) => ({
+		label: engine,
+		dataKey: ({ stats }: SystemStatsRecord) => stats?.g?.[gpuId]?.e?.[engine] ?? 0,
+		color: `hsl(${140 + (((i * 360) / engines.length) % 360)}, 65%, 52%)`,
+		opacity: 0.35,
+	}))
+
 	return (
 		<LineChartDefault
 			legend={true}