How to compile Code having PCM API?

totochan1985 — Tue, 21 Sep 2021 21:55:11 GMT

There is a piece of code (c_example.c) that comes with the PCM installation. Can someone tell me how to compile that i.e which libraries it needs to be linked against. Below is the code.

#include "cpucounters.h" #include <stdio.h> #include <dlfcn.h> #include <stdint.h> #include <stdlib.h> int pcm_getcpu() { int id = -1; asm volatile ( "rdtscp\n\t" "mov %%ecx, %0\n\t": "=r" (id) :: "%rax", "%rcx", "%rdx"); // processor ID is in ECX: https://www.felixcloutier.com/x86/rdtscp // Linux encodes the NUMA node starting at bit 12, so remove the NUMA // bits when returning the CPU integer by masking with 0xFFF. return id & 0xFFF; } struct { int (*pcm_c_build_core_event)(uint8_t id, const char * argv); int (*pcm_c_init)(); void (*pcm_c_start)(); void (*pcm_c_stop)(); uint64_t (*pcm_c_get_cycles)(uint32_t core_id); uint64_t (*pcm_c_get_instr)(uint32_t core_id); uint64_t (*pcm_c_get_core_event)(uint32_t core_id, uint32_t event_id); } PCM; #ifndef PCM_DYNAMIC_LIB /* Library functions declaration (instead of .h file) */ int pcm_c_build_core_event(uint8_t, const char *); int pcm_c_init(); void pcm_c_start(); void pcm_c_stop(); uint64_t pcm_c_get_cycles(uint32_t); uint64_t pcm_c_get_instr(uint32_t); uint64_t pcm_c_get_core_event(uint32_t, uint32_t); #endif int main(int argc, const char *argv[]) { int i,a[100],b[100],c[100]; uint32_t total = 0; int lcore_id; /* Seed for predictable rand() results */ srand(0); for (i=0; i < 100; ++i) { a[i] = rand(); b[i] = rand(); c[i] = rand(); } #ifdef PCM_DYNAMIC_LIB void * handle = dlopen("libpcm.so", RTLD_LAZY); if(!handle) { printf("Abort: could not (dynamically) load shared library \n"); return -1; } PCM.pcm_c_build_core_event = (int (*)(uint8_t, const char *)) dlsym(handle, "pcm_c_build_core_event"); PCM.pcm_c_init = (int (*)()) dlsym(handle, "pcm_c_init"); PCM.pcm_c_start = (void (*)()) dlsym(handle, "pcm_c_start"); PCM.pcm_c_stop = (void (*)()) dlsym(handle, "pcm_c_stop"); PCM.pcm_c_get_cycles = (uint64_t (*)(uint32_t)) dlsym(handle, "pcm_c_get_cycles"); PCM.pcm_c_get_instr = (uint64_t (*)(uint32_t)) dlsym(handle, "pcm_c_get_instr"); PCM.pcm_c_get_core_event = (uint64_t (*)(uint32_t,uint32_t)) dlsym(handle, "pcm_c_get_core_event"); #else PCM.pcm_c_build_core_event = pcm_c_build_core_event; PCM.pcm_c_init = pcm_c_init; PCM.pcm_c_start = pcm_c_start; PCM.pcm_c_stop = pcm_c_stop; PCM.pcm_c_get_cycles = pcm_c_get_cycles; PCM.pcm_c_get_instr = pcm_c_get_instr; PCM.pcm_c_get_core_event = pcm_c_get_core_event; #endif if(PCM.pcm_c_init == NULL || PCM.pcm_c_start == NULL || PCM.pcm_c_stop == NULL || PCM.pcm_c_get_cycles == NULL || PCM.pcm_c_get_instr == NULL || PCM.pcm_c_build_core_event == NULL) return -1; switch(argc-1) { case 4: PCM.pcm_c_build_core_event(3,argv[3]); case 3: PCM.pcm_c_build_core_event(2,argv[2]); case 2: PCM.pcm_c_build_core_event(1,argv[2]); case 1: PCM.pcm_c_build_core_event(0,argv[1]); case 0: break; default: printf("Number of arguments are too many! exit...\n"); return -2; } printf("[c_example] Initializing PCM measurements:\n"); PCM.pcm_c_init(); printf("[c_example] Calling PCM start()\n"); PCM.pcm_c_start(); for(i=0;i<10000;i++) c[i%100] = 4 * a[i%100] + b[i%100]; for(i=0;i<100;i++) total += c[i]; PCM.pcm_c_stop(); printf("[c_example] PCM measurment stopped, compute result %u\n", total); lcore_id = pcm_getcpu(); printf("C:%lu I:%lu, IPC:%3.2f\n", PCM.pcm_c_get_cycles(lcore_id), PCM.pcm_c_get_instr(lcore_id), (double)PCM.pcm_c_get_instr(lcore_id)/PCM.pcm_c_get_cycles(lcore_id)); printf("CPU%d E0: %lu, E1: %lu, E2: %lu, E3: %lu\n", lcore_id, PCM.pcm_c_get_core_event(lcore_id,0), PCM.pcm_c_get_core_event(lcore_id,1), PCM.pcm_c_get_core_event(lcore_id,2), PCM.pcm_c_get_core_event(lcore_id,3)); return 0; }

Re: How to compile Code having PCM API?

Thomas_W_Intel — Mon, 27 Sep 2021 10:21:56 GMT

The example needs to be linked against libpcm. This should be everything you need.
You might also want to have a look at the Makefile of the project. It includes the rules to compile and link the example.

topic Re: How to compile Code having PCM API? in Software Tuning, Performance Optimization & Platform Monitoring

How to compile Code having PCM API?

Re: How to compile Code having PCM API?