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rapl-wrapper.c
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268 lines (214 loc) · 6.95 KB
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/*
* rapl-wrapper.c
*
* Created on: May 24, 2015
* Author: millad
*/
#include "rapl-wrapper.h"
int msr_open(int core) {
char filename[BUFSIZ];
int f;
sprintf(filename, "/dev/cpu/%d/msr", core);
f = open(filename, O_RDONLY);
if (f < 0) {
if ( errno == ENXIO) {
fprintf(stderr, "rdmsr: No CPU %d\n", core);
exit(2);
} else if ( errno == EIO) {
fprintf(stderr, "rdmsr: CPU %d doesn't support MSRs\n", core);
exit(3);
} else {
perror("rdmsr:open");
fprintf(stderr, "Trying to open %s\n", filename);
exit(127);
}
}
return f;
}
long long msr_read(int f, int which) {
uint64_t data;
if (pread(f, &data, sizeof data, which) != sizeof data) {
perror("rdmsr:pread");
exit(127);
}
return (long long) data;
}
int detect_cpu() {
FILE *f;
int family, model = -1;
char buffer[BUFSIZ], *result;
char vendor[BUFSIZ];
f = fopen("/proc/cpuinfo", "r");
if (f == NULL)
return -1;
while (1) {
result = fgets(buffer, BUFSIZ, f);
if (result == NULL)
break;
if (!strncmp(result, "vendor_id", 8)) {
sscanf(result, "%*s%*s%s", vendor);
if (strncmp(vendor, "GenuineIntel", 12)) {
printf("%s not an Intel chip\n", vendor);
return -1;
}
}
if (!strncmp(result, "cpu family", 10)) {
sscanf(result, "%*s%*s%*s%d", &family);
if (family != 6) {
printf("Wrong CPU family %d\n", family);
return -1;
}
}
if (!strncmp(result, "model", 5)) {
sscanf(result, "%*s%*s%d", &model);
}
}
fclose(f);
return model;
}
void print_cpu_model() {
int model = detect_cpu();
switch (model) {
case CPU_SANDYBRIDGE:
printf("Found Sandybridge CPU\n");
break;
case CPU_SANDYBRIDGE_EP:
printf("Found Sandybridge-EP CPU\n");
break;
case CPU_IVYBRIDGE:
printf("Found Ivybridge CPU\n");
break;
case CPU_IVYBRIDGE_EP:
printf("Found Ivybridge-EP CPU\n");
break;
case CPU_HASWELL:
printf("Found Haswell CPU\n");
break;
default:
printf("Unsupported model %d\n", model);
break;
}
}
PETU_t validate_PETU(int msr_handler, PETU_t *pet) {
return (pet == 0) ? msr_calculate_units(msr_handler) : *pet;
}
PETU_t msr_calculate_units(int msr_handler) {
/* Calculate the units used */
long long result=msr_read(msr_handler, MSR_RAPL_POWER_UNIT);
PETU_t pet;
pet.power_units = pow(0.5, (double) (result & 0xf));
pet.energy_units = pow(0.5, (double) ((result >> 8) & 0x1f));
pet.time_units = pow(0.5, (double) ((result >> 16) & 0xf));
return pet;
}
PackagePowerInfo_t msr_get_package_power_info(int msr_handler, PETU_t *pet) {
/* Show package power info */
long long result=msr_read(msr_handler, MSR_PKG_POWER_INFO);
PackagePowerInfo_t ppi;
PETU_t p = validate_PETU(msr_handler, pet);
ppi.thermal_spec_power = p.power_units * (double) (result & 0x7fff);
ppi.minimum_power = p.power_units * (double) ((result >> 16) & 0x7fff);
ppi.maximum_power = p.power_units * (double) ((result >> 32) & 0x7fff);
ppi.time_window = p.time_units * (double) ((result >> 48) & 0x7fff);
return ppi;
}
PackagePowerInfo_t msr_get_package_power_info_no_pet(int msr_handler) {
return msr_get_package_power_info(msr_handler, 0);
}
PackagePowerLimit_t msr_get_package_power_limit(int msr_handler, PETU_t *pet) {
/* Show package power limit */
long long result=msr_read(msr_handler, MSR_PKG_RAPL_POWER_LIMIT);
PackagePowerLimit_t ppl;
PETU_t p = validate_PETU(msr_handler, pet);
ppl.power_limit_is_locked = (result >> 63);
ppl.pkg_power_limit_1 = p.power_units*(double)((result>>0)&0x7FFF);
ppl.pkg_time_window_1 = p.time_units*(double)((result>>17)&0x007F);
ppl.pkg_is_enabled_1 = (result & (1LL<<15));
ppl.pkg_is_clamped_1 = (result & (1LL<<16));
ppl.pkg_power_limit_2 = p.power_units*(double)((result>>32)&0x7FFF);
ppl.pkg_time_window_2 = p.time_units*(double)((result>>49)&0x007F);
ppl.pkg_is_enabled_1 = (result & (1LL<<47));
ppl.pkg_is_clamped_1 = (result & (1LL<<48));
return ppl;
}
PackagePowerLimit_t msr_get_package_power_limit_no_pet(int msr_handler) {
return msr_get_package_power_limit(msr_handler, 0);
}
double msr_get_package_energy(int msr_handler, PETU_t *pet) {
long long result=msr_read(msr_handler, MSR_PKG_ENERGY_STATUS);
PETU_t p = validate_PETU(msr_handler, pet);
return (double)result*p.energy_units;
}
double msr_get_package_energy_no_pet(int msr_handler) {
return msr_get_package_energy(msr_handler, 0);
}
double msr_get_accum_pkg_throttled_time(int msr_handler, PETU_t *pet) {
int cpu_model = detect_cpu();
/* only available on *Bridge-EP */
if ((cpu_model==CPU_SANDYBRIDGE_EP) || (cpu_model==CPU_IVYBRIDGE_EP))
{
long long result=msr_read(msr_handler, MSR_PKG_PERF_STATUS);
PETU_t p = validate_PETU(msr_handler, pet);
return (double)result*p.time_units;
}
return 0.0;
}
double msr_get_accum_pkg_throttled_time_no_pet(int msr_handler) {
return msr_get_accum_pkg_throttled_time(msr_handler, 0);
}
PowerPlane_EnergyPolicy_t msr_get_energy_policy_for_core(int msr_handler, PETU_t *pet) {
PowerPlane_EnergyPolicy_t pp;
PETU_t p = validate_PETU(msr_handler, pet);
long long result;
result = msr_read(msr_handler, MSR_PP0_ENERGY_STATUS);
pp.energy = (double)result*p.energy_units;
result = msr_read(msr_handler, MSR_PP0_POLICY);
pp.policy = (int)result&0x001f;
pp.accum_throttled_time = 0.0;
int cpu_model = detect_cpu();
/* only available on *Bridge-EP */
if ((cpu_model==CPU_SANDYBRIDGE_EP) || (cpu_model==CPU_IVYBRIDGE_EP))
{
result=msr_read(msr_handler, MSR_PP0_PERF_STATUS);
pp.accum_throttled_time = (double)result*p.time_units;
}
return pp;
}
PowerPlane_EnergyPolicy_t msr_get_energy_policy_for_core_no_pet(int msr_handler) {
return msr_get_energy_policy_for_core(msr_handler, 0);
}
PowerPlane_EnergyPolicy_t msr_get_energy_policy_for_integ_gpu(int msr_handler, PETU_t *pet) {
PowerPlane_EnergyPolicy_t pp;
pp.energy = 0.0;
pp.policy = -1;
pp.accum_throttled_time = 0.0;
PETU_t p = validate_PETU(msr_handler, pet);
int cpu_model = detect_cpu();
/* not available on *Bridge-EP */
if ((cpu_model==CPU_SANDYBRIDGE) || (cpu_model==CPU_IVYBRIDGE) || (cpu_model==CPU_HASWELL)) {
long long result;
result = msr_read(msr_handler, MSR_PP1_ENERGY_STATUS);
PETU_t p = validate_PETU(msr_handler, pet);
pp.energy = (double)result*p.energy_units;
result = msr_read(msr_handler, MSR_PP1_POLICY);
pp.policy = (int)result&0x001f;
}
return pp;
}
PowerPlane_EnergyPolicy_t msr_get_energy_policy_for_integ_gpu_no_pet(int msr_handler) {
return msr_get_energy_policy_for_integ_gpu(msr_handler, 0);
}
double msr_get_energy_for_DRAM(int msr_handler, PETU_t *pet) {
int cpu_model = detect_cpu();
/* Despite documentation saying otherwise, it looks like */
/* You can get DRAM readings on regular Haswell */
if ((cpu_model==CPU_SANDYBRIDGE_EP) || (cpu_model==CPU_IVYBRIDGE_EP) || (cpu_model==CPU_HASWELL)) {
long long result = msr_read(msr_handler,MSR_DRAM_ENERGY_STATUS);
PETU_t p = validate_PETU(msr_handler, pet);
return (double)result*p.energy_units;
}
return 0;
}
double msr_get_energy_for_DRAM_no_pet(int msr_handler) {
return msr_get_energy_for_DRAM(msr_handler, 0);
}