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nvsettings.cpp
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nvsettings.cpp
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/**
* nvidia-settings command line interface for linux - tpruvot 2017
*
* Notes: need X setup and running, with an opened X session.
* init speed could be improved, running multiple threads
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h> // pid_t
#include "miner.h"
#include "nvml.h"
#include "cuda_runtime.h"
#ifdef __linux__
#define NVS_PATH "/usr/bin/nvidia-settings"
static int8_t nvs_dev_map[MAX_GPUS] = { 0 };
static uint8_t nvs_bus_ids[MAX_GPUS] = { 0 };
static int32_t nvs_clocks_set[MAX_GPUS] = { 0 };
extern int32_t device_mem_offsets[MAX_GPUS];
#if 0 /* complicated exec way and not better in fine */
int nvs_query_fork_int(int nvs_id, const char* field)
{
pid_t pid;
int pipes[2] = { 0 };
if (pipe(pipes) < 0)
return -1;
if ((pid = fork()) == -1) {
close(pipes[0]);
close(pipes[1]);
return -1;
} else if (pid == 0) {
char gpu_field[128] = { 0 };
sprintf(gpu_field, "[gpu:%d]/%s", nvs_id, field);
dup2(pipes[1], STDOUT_FILENO);
close(pipes[0]);
//close(pipes[1]);
if (-1 == execl(NVS_PATH, "nvidia-settings", "-q", gpu_field, "-t", NULL)) {
exit(-1);
}
} else {
int intval = -1;
FILE *p = fdopen(pipes[0], "r");
close(pipes[1]);
if (!p) {
applog(LOG_WARNING, "%s: fdopen(%d) failed", __func__, pipes[0]);
return -1;
}
int rc = fscanf(p, "%d", &intval); // BUS 0000:2a:00.0 is read 42
if (rc > 0) {
//applog(LOG_BLUE, "%s res=%d", field, intval);
}
fclose(p);
close(pipes[0]);
return intval;
}
return -1;
}
#endif
int nvs_query_int(int nvs_id, const char* field, int showerr)
{
FILE *fp;
char command[256] = { 0 };
sprintf(command, "%s -t -q '[gpu:%d]/%s' 2>&1", NVS_PATH, nvs_id, field);
fp = popen(command, "r");
if (fp) {
int intval = -1;
if (!showerr) {
int b = fscanf(fp, "%d", &intval);
if (!b) {
pclose(fp);
return -1;
}
} else {
char msg[512] = { 0 };
char buf[64] = { 0 };
ssize_t bytes, len=0, maxlen=sizeof(msg)-1;
while ((bytes=fscanf(fp, "%s", buf)) > 0) {
len += snprintf(&msg[len], maxlen-len, "%s ", buf);
if (len >= maxlen) break;
}
if (strstr(msg, "ERROR")) {
char *xtra = strstr(msg, "; please run");
if (xtra) *xtra = '\0'; // strip noise
applog(LOG_INFO, "%s", msg);
intval = -1;
} else {
sscanf(msg, "%d", &intval);
}
}
pclose(fp);
return intval;
}
return -1;
}
int nvs_query_str(int nvs_id, const char* field, char* output, size_t maxlen)
{
FILE *fp;
char command[256] = { 0 };
*output = '\0';
sprintf(command, "%s -t -q '[gpu:%d]/%s' 2>&1", NVS_PATH, nvs_id, field);
fp = popen(command, "r");
if (fp) {
char buf[256] = { 0 };
ssize_t len=0;
ssize_t bytes=0;
while ((bytes=fscanf(fp, "%s", buf)) > 0) {
//applog(LOG_BLUE, "%d %s %d", nvs_id, buf, (int) bytes);
len += snprintf(&output[len], maxlen-len, "%s ", buf);
if (len >= maxlen) break;
}
pclose(fp);
if (strstr(output, "ERROR")) {
char *xtra = strstr(output, "; please run");
if (xtra) *xtra = '\0'; // strip noise
applog(LOG_INFO, "%s", output);
*output='\0';
}
return (int) len;
}
return -1;
}
int nvs_set_int(int nvs_id, const char* field, int value)
{
FILE *fp;
char command[256] = { 0 };
int res = -1;
snprintf(command, 256, "%s -a '[gpu:%d]/%s=%d' 2>&1", NVS_PATH, nvs_id, field, value);
fp = popen(command, "r");
if (fp) {
char msg[512] = { 0 };
char buf[64] = { 0 };
ssize_t bytes, len=0, maxlen=sizeof(msg)-1;
while ((bytes=fscanf(fp, "%s", buf)) > 0) {
len += snprintf(&msg[len], maxlen-len, "%s ", buf);
if (len >= maxlen) break;
}
if (strstr(msg, "ERROR")) {
char *xtra = strstr(msg, "; please run");
if (xtra) *xtra = '\0'; // strip noise
applog(LOG_INFO, "%s", msg);
} else
res = 0;
pclose(fp);
}
return res;
}
int8_t nvs_devnum(int dev_id)
{
return nvs_dev_map[dev_id];
}
int nvs_devid(int8_t nvs_id)
{
for (int i=0; i < opt_n_threads; i++) {
int dev_id = device_map[i % MAX_GPUS];
if (nvs_dev_map[dev_id] == nvs_id)
return dev_id;
}
return 0;
}
int nvs_init()
{
struct stat info;
struct timeval tv_start, tv_end, diff;
int x_devices = 0;
int n_threads = opt_n_threads;
if (stat(NVS_PATH, &info))
return -ENOENT;
gettimeofday(&tv_start, NULL);
for (int d = 0; d < MAX_GPUS; d++) {
// this part can be "slow" (100-200ms per device)
int res = nvs_query_int(d, "PCIBus", 1);
if (res < 0) break;
nvs_bus_ids[d] = 0xFFu & res;
x_devices++;
}
if (opt_debug) {
gettimeofday(&tv_end, NULL);
timeval_subtract(&diff, &tv_end, &tv_start);
applog(LOG_DEBUG, "nvidia-settings pci bus queries took %.2f ms",
(1000.0 * diff.tv_sec) + (0.001 * diff.tv_usec));
}
if (!x_devices)
return -ENODEV;
if (!n_threads) n_threads = cuda_num_devices();
for (int i = 0; i < n_threads; i++) {
int dev_id = device_map[i % MAX_GPUS];
cudaDeviceProp props;
if (cudaGetDeviceProperties(&props, dev_id) == cudaSuccess) {
for (int8_t d = 0; d < x_devices; d++) {
if (nvs_bus_ids[d] == (uint8_t) props.pciBusID) {
gpulog(LOG_DEBUG, i, "matches X gpu:%d by busId %u",
(int) d, (uint) nvs_bus_ids[d]);
nvs_dev_map[dev_id] = d;
/* char buf[1024] = { 0 };
nvs_query_str(d, "GPUCurrentClockFreqsString", buf, sizeof(buf)-1);
gpulog(LOG_DEBUG, d, "%s", buf); */
break;
}
}
}
}
return 0;
}
int nvs_set_clocks(int dev_id)
{
int res;
int8_t d = nvs_devnum(dev_id);
if (d < 0) return -ENODEV;
if (!device_mem_offsets[dev_id] || nvs_clocks_set[d]) return 0;
res = nvs_set_int(d, "GPUMemoryTransferRateOffsetAllPerformanceLevels", device_mem_offsets[dev_id]*2);
if (res) nvs_clocks_set[d] = device_mem_offsets[dev_id]*2;
return res;
}
void nvs_reset_clocks(int dev_id)
{
int8_t d = nvs_devnum(dev_id);
if (d < 0 || !nvs_clocks_set[d]) return;
nvs_set_int(d, "GPUMemoryTransferRateOffsetAllPerformanceLevels", 0);
nvs_clocks_set[d] = 0;
}
#else
int nvs_init() { return -ENOSYS; }
int nvs_set_clocks(int dev_id) { return -ENOSYS; }
void nvs_reset_clocks(int dev_id) { }
#endif