Add comments and units to all nvidia metrics

collectors.json

@@ -1,13 +1,18 @@
 {
-    "numastats": {},
     "cpufreq": {},
     "cpufreq_cpuinfo": {},
     "gpfs": {
-        "exclude_filesystem": [ "test_fs" ]
+        "exclude_filesystem": [
+            "test_fs"
+        ]
     },
     "loadavg": {
-        "exclude_metrics": [ "proc_total" ]
+        "exclude_metrics": [
+            "proc_total"
+        ]
     },
+    "numastats": {},
+    "nvidia": {},
     "tempstat": {
         "tag_override": {
             "hwmon0": {

collectors/nvidiaMetric.go

@@ -134,17 +134,29 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		device := &m.gpus[i]
 
 		if !device.excludeMetrics["nv_util"] || !device.excludeMetrics["nv_mem_util"] {
+			// Retrieves the current utilization rates for the device's major subsystems.
+			//
+			// Available utilization rates
+			// * Gpu: Percent of time over the past sample period during which one or more kernels was executing on the GPU.
+			// * Memory: Percent of time over the past sample period during which global (device) memory was being read or written
+			//
+			// Note:
+			// * During driver initialization when ECC is enabled one can see high GPU and Memory Utilization readings.
+			//   This is caused by ECC Memory Scrubbing mechanism that is performed during driver initialization.
+			// * On MIG-enabled GPUs, querying device utilization rates is not currently supported.
 			util, ret := nvml.DeviceGetUtilizationRates(device.device)
 			if ret == nvml.SUCCESS {
 				if !device.excludeMetrics["nv_util"] {
 					y, err := lp.New("nv_util", device.tags, m.meta, map[string]interface{}{"value": float64(util.Gpu)}, time.Now())
 					if err == nil {
+						y.AddMeta("unit", "%")
 						output <- y
 					}
 				}
 				if !device.excludeMetrics["nv_mem_util"] {
 					y, err := lp.New("nv_mem_util", device.tags, m.meta, map[string]interface{}{"value": float64(util.Memory)}, time.Now())
 					if err == nil {
+						y.AddMeta("unit", "%")
 						output <- y
 					}
 				}
@@ -152,6 +164,20 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_mem_total"] || !device.excludeMetrics["nv_fb_memory"] {
+			// Retrieves the amount of used, free and total memory available on the device, in bytes.
+			//
+			// Enabling ECC reduces the amount of total available memory, due to the extra required parity bits.
+			//
+			// The reported amount of used memory is equal to the sum of memory allocated by all active channels on the device.
+			//
+			// Available memory info:
+			// * Free: Unallocated FB memory (in bytes).
+			// * Total: Total installed FB memory (in bytes).
+			// * Used: Allocated FB memory (in bytes). Note that the driver/GPU always sets aside a small amount of memory for bookkeeping.
+			//
+			// Note:
+			// In MIG mode, if device handle is provided, the API returns aggregate information, only if the caller has appropriate privileges.
+			// Per-instance information can be queried by using specific MIG device handles.
 			meminfo, ret := nvml.DeviceGetMemoryInfo(device.device)
 			if ret == nvml.SUCCESS {
 				if !device.excludeMetrics["nv_mem_total"] {
@@ -175,6 +201,11 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_temp"] {
+			// Retrieves the current temperature readings for the device, in degrees C.
+			//
+			// Available temperature sensors:
+			// * TEMPERATURE_GPU: Temperature sensor for the GPU die.
+			// * NVML_TEMPERATURE_COUNT
 			temp, ret := nvml.DeviceGetTemperature(device.device, nvml.TEMPERATURE_GPU)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_temp", device.tags, m.meta, map[string]interface{}{"value": float64(temp)}, time.Now())
@@ -186,33 +217,50 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_fan"] {
+			// Retrieves the intended operating speed of the device's fan.
+			//
+			// Note: The reported speed is the intended fan speed.
+			// If the fan is physically blocked and unable to spin, the output will not match the actual fan speed.
+			//
+			// For all discrete products with dedicated fans.
+			//
+			// The fan speed is expressed as a percentage of the product's maximum noise tolerance fan speed.
+			// This value may exceed 100% in certain cases.
 			fan, ret := nvml.DeviceGetFanSpeed(device.device)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_fan", device.tags, m.meta, map[string]interface{}{"value": float64(fan)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "%")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_ecc_mode"] {
+			// Retrieves the current and pending ECC modes for the device.
+			//
+			// For Fermi or newer fully supported devices. Only applicable to devices with ECC.
+			// Requires NVML_INFOROM_ECC version 1.0 or higher.
+			//
+			// Changing ECC modes requires a reboot.
+			// The "pending" ECC mode refers to the target mode following the next reboot.
 			_, ecc_pend, ret := nvml.DeviceGetEccMode(device.device)
 			if ret == nvml.SUCCESS {
 				var y lp.CCMetric
 				var err error
 				switch ecc_pend {
 				case nvml.FEATURE_DISABLED:
-					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": string("OFF")}, time.Now())
+					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": "OFF"}, time.Now())
 				case nvml.FEATURE_ENABLED:
-					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": string("ON")}, time.Now())
+					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": "ON"}, time.Now())
 				default:
-					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": string("UNKNOWN")}, time.Now())
+					y, err = lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": "UNKNOWN"}, time.Now())
 				}
 				if err == nil {
 					output <- y
 				}
 			} else if ret == nvml.ERROR_NOT_SUPPORTED {
-				y, err := lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": string("N/A")}, time.Now())
+				y, err := lp.New("nv_ecc_mode", device.tags, m.meta, map[string]interface{}{"value": "N/A"}, time.Now())
 				if err == nil {
 					output <- y
 				}
@@ -220,9 +268,16 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_perf_state"] {
-			pstate, ret := nvml.DeviceGetPerformanceState(device.device)
+			// Retrieves the current performance state for the device.
+			//
+			// Allowed PStates:
+			//  0: Maximum Performance.
+			// ..
+			// 15: Minimum Performance.
+			// 32: Unknown performance state.
+			pState, ret := nvml.DeviceGetPerformanceState(device.device)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_perf_state", device.tags, m.meta, map[string]interface{}{"value": fmt.Sprintf("P%d", int(pstate))}, time.Now())
+				y, err := lp.New("nv_perf_state", device.tags, m.meta, map[string]interface{}{"value": fmt.Sprintf("P%d", int(pState))}, time.Now())
 				if err == nil {
 					output <- y
 				}
@@ -230,77 +285,115 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_power_usage_report"] {
+			// Retrieves power usage for this GPU in milliwatts and its associated circuitry (e.g. memory)
+			//
+			// On Fermi and Kepler GPUs the reading is accurate to within +/- 5% of current power draw.
+			//
+			// It is only available if power management mode is supported
 			power, ret := nvml.DeviceGetPowerUsage(device.device)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_power_usage_report", device.tags, m.meta, map[string]interface{}{"value": float64(power) / 1000}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "watts")
 					output <- y
 				}
 			}
 		}
 
+		// Retrieves the current clock speeds for the device.
+		//
+		// Available clock information:
+		// * CLOCK_GRAPHICS: Graphics clock domain.
+		// * CLOCK_SM: Streaming Multiprocessor clock domain.
+		// * CLOCK_MEM: Memory clock domain.
 		if !device.excludeMetrics["nv_graphics_clock_report"] {
-			gclk, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_GRAPHICS)
+			graphicsClock, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_GRAPHICS)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_graphics_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(gclk)}, time.Now())
+				y, err := lp.New("nv_graphics_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(graphicsClock)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_sm_clock_report"] {
-			smclk, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_SM)
+			smCock, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_SM)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_sm_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(smclk)}, time.Now())
+				y, err := lp.New("nv_sm_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(smCock)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_mem_clock_report"] {
-			memclk, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_MEM)
+			memClock, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_MEM)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_mem_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(memclk)}, time.Now())
+				y, err := lp.New("nv_mem_clock_report", device.tags, m.meta, map[string]interface{}{"value": float64(memClock)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
+		// Retrieves the maximum clock speeds for the device.
+		//
+		// Available clock information:
+		// * CLOCK_GRAPHICS: Graphics clock domain.
+		// * CLOCK_SM:       Streaming multiprocessor clock domain.
+		// * CLOCK_MEM:      Memory clock domain.
+		// * CLOCK_VIDEO:    Video encoder/decoder clock domain.
+		// * CLOCK_COUNT:    Count of clock types.
+		//
+		// Note:
+		/// On GPUs from Fermi family current P0 clocks (reported by nvmlDeviceGetClockInfo) can differ from max clocks by few MHz.
 		if !device.excludeMetrics["nv_max_graphics_clock"] {
 			max_gclk, ret := nvml.DeviceGetMaxClockInfo(device.device, nvml.CLOCK_GRAPHICS)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_max_graphics_clock", device.tags, m.meta, map[string]interface{}{"value": float64(max_gclk)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_max_sm_clock"] {
-			max_smclk, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_SM)
+			maxSmClock, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_SM)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_max_sm_clock", device.tags, m.meta, map[string]interface{}{"value": float64(max_smclk)}, time.Now())
+				y, err := lp.New("nv_max_sm_clock", device.tags, m.meta, map[string]interface{}{"value": float64(maxSmClock)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_max_mem_clock"] {
-			max_memclk, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_MEM)
+			maxMemClock, ret := nvml.DeviceGetClockInfo(device.device, nvml.CLOCK_MEM)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_max_mem_clock", device.tags, m.meta, map[string]interface{}{"value": float64(max_memclk)}, time.Now())
+				y, err := lp.New("nv_max_mem_clock", device.tags, m.meta, map[string]interface{}{"value": float64(maxMemClock)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "MHz")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_ecc_db_error"] {
-			ecc_db, ret := nvml.DeviceGetTotalEccErrors(device.device, 1, 1)
+			// Retrieves the total ECC error counts for the device.
+			//
+			// For Fermi or newer fully supported devices.
+			// Only applicable to devices with ECC.
+			// Requires NVML_INFOROM_ECC version 1.0 or higher.
+			// Requires ECC Mode to be enabled.
+			//
+			// The total error count is the sum of errors across each of the separate memory systems,
+			// i.e. the total set of errors across the entire device.
+			ecc_db, ret := nvml.DeviceGetTotalEccErrors(device.device, nvml.MEMORY_ERROR_TYPE_UNCORRECTED, nvml.AGGREGATE_ECC)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_ecc_db_error", device.tags, m.meta, map[string]interface{}{"value": float64(ecc_db)}, time.Now())
 				if err == nil {
@@ -310,7 +403,7 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_ecc_sb_error"] {
-			ecc_sb, ret := nvml.DeviceGetTotalEccErrors(device.device, 0, 1)
+			ecc_sb, ret := nvml.DeviceGetTotalEccErrors(device.device, nvml.MEMORY_ERROR_TYPE_CORRECTED, nvml.AGGREGATE_ECC)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_ecc_sb_error", device.tags, m.meta, map[string]interface{}{"value": float64(ecc_sb)}, time.Now())
 				if err == nil {
@@ -320,30 +413,49 @@ func (m *NvidiaCollector) Read(interval time.Duration, output chan lp.CCMetric)
 		}
 
 		if !device.excludeMetrics["nv_power_man_limit"] {
+			// Retrieves the power management limit associated with this device.
+			//
+			// For Fermi or newer fully supported devices.
+			//
+			// The power limit defines the upper boundary for the card's power draw.
+			// If the card's total power draw reaches this limit the power management algorithm kicks in.
 			pwr_limit, ret := nvml.DeviceGetPowerManagementLimit(device.device)
 			if ret == nvml.SUCCESS {
-				y, err := lp.New("nv_power_man_limit", device.tags, m.meta, map[string]interface{}{"value": float64(pwr_limit)}, time.Now())
+				y, err := lp.New("nv_power_man_limit", device.tags, m.meta, map[string]interface{}{"value": float64(pwr_limit) / 1000}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "watts")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_encoder_util"] {
+			// Retrieves the current utilization and sampling size in microseconds for the Encoder
+			//
+			// For Kepler or newer fully supported devices.
+			//
+			// Note: On MIG-enabled GPUs, querying encoder utilization is not currently supported.
 			enc_util, _, ret := nvml.DeviceGetEncoderUtilization(device.device)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_encoder_util", device.tags, m.meta, map[string]interface{}{"value": float64(enc_util)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "%")
 					output <- y
 				}
 			}
 		}
 
 		if !device.excludeMetrics["nv_decoder_util"] {
+			// Retrieves the current utilization and sampling size in microseconds for the Decoder
+			//
+			// For Kepler or newer fully supported devices.
+			//
+			// Note: On MIG-enabled GPUs, querying decoder utilization is not currently supported.
 			dec_util, _, ret := nvml.DeviceGetDecoderUtilization(device.device)
 			if ret == nvml.SUCCESS {
 				y, err := lp.New("nv_decoder_util", device.tags, m.meta, map[string]interface{}{"value": float64(dec_util)}, time.Now())
 				if err == nil {
+					y.AddMeta("unit", "%")
 					output <- y
 				}
 			}