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NVIDIA Management Library (NVML) bindings for Go

License: Apache License 2.0

Makefile 0.25% Go 8.37% Shell 0.06% C 91.32%

cgo golang gpu monitoring nvml

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Cannot dynamic link nvidia-ml and use gonvml at the same time

example failed to query device count:

package main

// #cgo LDFLAGS: -ldl -lnvidia-ml
// #cgo CFLAGS: -I /usr/local/cuda-8.0/include
/*
#include <stdio.h>
#include "nvml.h"
void testNvml()
{
    nvmlReturn_t result;
    unsigned int device_count, i;

    // First initialize NVML library
    result = nvmlInit();
    if (NVML_SUCCESS != result)
    {
        printf("Failed to initialize NVML: %s\n", nvmlErrorString(result));
        return;
    }

    result = nvmlDeviceGetCount(&device_count);
    if (NVML_SUCCESS != result)
    {
        printf("Failed to query device count: %s\n", nvmlErrorString(result));
        return;
    }
    printf("Found %d device%s\n\n", device_count, device_count != 1 ? "s" : "");
}
*/
import "C"

import (
	"fmt"

	"github.com/mindprince/gonvml"
)

func testGoNvml() (value []string) {
	err := gonvml.Initialize()
	if err != nil {
		return
	}
	defer func() { _ = gonvml.Shutdown() }()

	n, err := gonvml.DeviceCount()
	if err != nil {
		panic(err)
	}
	fmt.Println("testGoNvml gpu num:", n)
	return
}

func main() {
	C.testNvml()
	testGoNvml()
	C.testNvml()
}

output:

Failed to query device count: nvmlErrorString Function Not Found
testGoNvml gpu num: 8
Found 8 devices

example ok

package main

// #cgo LDFLAGS: -ldl -lnvidia-ml
// #cgo CFLAGS: -I /usr/local/cuda-8.0/include
/*
#include <stdio.h>
#include "nvml.h"
void testNvml()
{
    nvmlReturn_t result;
    unsigned int device_count, i;

    // First initialize NVML library
    result = nvmlInit();
    if (NVML_SUCCESS != result)
    {
        printf("Failed to initialize NVML: %s\n", nvmlErrorString(result));
        return;
    }

    result = nvmlDeviceGetCount(&device_count);
    if (NVML_SUCCESS != result)
    {
        printf("Failed to query device count: %s\n", nvmlErrorString(result));
        return;
    }
    printf("Found %d device%s\n\n", device_count, device_count != 1 ? "s" : "");
}
*/
import "C"

func main() {
	C.testNvml()
}

output:

Found 8 devices

This is a simple example, actually a possible situation:

a complex golang program import package a and b
package a import gonvml
package b call libnvidia-xxx use cgo
libnvidia-xxx dynamic link libnvidia-ml

Updating to nvidia driver 390.116 has broken this

I updated to the latest nvidia drivers and there's an issue with running the example go file...

$ gonvml/cmd/example$ go run example.go
Initialize() took 668.203408ms
SystemDriverVersion(): 390.116
DeviceCount(): 1
	minorNumber: 0
	uuid: GPU-f4978516-fb34-9fff-a5ae-d7a5b7f8a33c
	name: Quadro P2000
	memory.total: 5304745984, memory.used: 0
	utilization.gpu: 0, utilization.memory: 0
	power.draw: 18850
	average power.draw for last 10s: 18565
	dev.AverageGPUUtilization() error: nvml: Not Found

Found the library on my system in these paths

/usr/lib/i386-linux-gnu/libnvidia-ml.so
/usr/lib/i386-linux-gnu/libnvidia-ml.so.1
/usr/lib/i386-linux-gnu/libnvidia-ml.so.390.116
/usr/lib/x86_64-linux-gnu/libnvidia-ml.so
/usr/lib/x86_64-linux-gnu/libnvidia-ml.so.1
/usr/lib/x86_64-linux-gnu/libnvidia-ml.so.390.116

Query clock speeds

I'd like to be able to query the current and maximum gpu clock speeds if possible:

Specifically, for my purposes:

nvmlDeviceGetMaxClockInfo
and
nvmlDeviceGetClockInfo with a clock type of NVML_CLOCK_SM = 1

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