BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px;
}Dear All,
I am a newbie to use perfmon2 interface but have a considerable
experience in using Oprofile as a system-wide profiler. I am trying
to get the same measurement using perfmon just to analyze the two
tools performance with respect to my experiment.
I have installed perfmon2 library and pfmon on AMD 64 Opetron box
running 2.6.29 linux kernel. Using the samples, I am able to collect
the performance counter values for one event (my hardware can support
up to 4 events), I have two main queries:
1. It is strange that when I increase the number of events to
monitor, pfm_read_pmds given me error, whe I do 'perror' it gives me
message as "Invalid Argument."
2. I tried to enable system-wide option using the same code, it does
not even load the context, 'perror' returns same error message.
Please find the code below, I am using simple dense matrix
multiplication as the code to monitor at the instance.
----------------------------------------------------------------------------------
#include
#include
#include
#include
#include
#include
#include
#include
#define MAX 500
int main(){
int a[MAX],b[MAX],c[MAX];
int i,j,k=0;
char name[50];
pfarg_ctx_t ctx;
int fd,tid;
pfarg_load_t load;
pfarg_pmd_t pd[2];
pfarg_pmc_t pc[2];
pfmlib_input_param_t inp;
pfmlib_output_param_t outp;
if (pfm_initialize() != PFMLIB_SUCCESS){
printf("nCan't initialize libraryn");
exit(1);
}
memset(pd, 0, sizeof(pd));
memset(pc, 0,sizeof(pc));
memset(&ctx, 0, sizeof(ctx));
memset(&load, 0, sizeof(load));
memset(&inp, 0, sizeof(inp));
memset(&outp, 0, sizeof(outp));
if(pfm_find_event("cpu_clk_unhalted",
&inp.pfp_events[0].event) == PFMLIB_ERR_NOTFOUND)
printf("ncpu_clk_unhalted not foundn");
//if(pfm_find_event("data_cache_accesses",
&inp.pfp_events[1].event) == PFMLIB_ERR_NOTFOUND)
// printf("ndata_cache_accesses not foundn");
inp.pfp_flags |= PFMLIB_PFP_SYSTEMWIDE;
inp.pfp_dfl_plm |= PFM_PLM3 | PFM_PLM0;
inp.pfp_event_count = 1; // 2
if(pfm_dispatch_events(&inp, NULL, &outp, NULL) !=
PFMLIB_SUCCESS) {
perror("nCan't perform dispatchn");
exit(1);
}
for(i=0;i < outp.pfp_pmc_count; i++) {
pc[i].reg_num = outp.pfp_pmcs[i].reg_num;
pc[i].reg_value = outp.pfp_pmcs[i].reg_value;
}
for(i=0; i < outp.pfp_pmd_count; i++) {
pd[i].reg_num = outp.pfp_pmds[i].reg_num;
pd[i].reg_value = 0;
}
ctx.ctx_flags |= PFM_FL_SYSTEM_WIDE;
fd = pfm_create_context(&ctx, NULL, 0, 0);
if(fd == -1) {
perror("nCan't create pfm contextn");
exit(1);
}
if(pfm_write_pmcs(fd, pc, outp.pfp_pmc_count) == -1){
perror("nCan't perform write to pmcsn");
exit(1);
}
if(pfm_write_pmds(fd, pd, 1) == -1) {
perror("nCan't perform write to pmdsn");
exit(1);
}
load.load_pid = getpid();
if(pfm_load_context(fd, &load) == -1) {
perror("nCan't load contextn");
exit(1);
}
pfm_start(fd, NULL);
for(i=0; i < MAX; i++) {
a[i] = b[i] = 1;
c[i] = 0;
}
for(k = 0; k < MAX; k++) {
for(i=0; i < MAX; i++) {
for(j=0; j < MAX; j++)
c[i] += a[i] * b[j];
}
}
pfm_stop(fd);
if(pfm_read_pmds(fd, pd, inp.pfp_event_count) == -1){
perror("nCan't read pmdsn");
exit(1);
}
for(i = 0; i < inp.pfp_event_count; i++){
bzero(name,sizeof(name));
pfm_find_full_event(name,&inp.pfp_events[i]);
printf("n[ %s ] - %llu", name, pd[i].reg_value);
}
close(fd);
return 0;
}
--------------------------------------------------------------------------------------
Your help in resolving this problem is highly appreciable!
Thanks & Regards!
Ata E Husain Bohra
University at Buffalo,
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