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benchmarks/gem_latency: Measure CPU usage

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Try and gauge the amount of CPU time used for each dispatch/wait cycle.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-12-20 15:18:56 +00:00
parent a91ee853b1
commit 3cc8f957f1
1 changed files with 17 additions and 2 deletions
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19
benchmarks/gem_latency.c
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@ -40,6 +40,7 @@
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <sys/time.h> #include <sys/time.h>
#include <sys/resource.h>
#include "drm.h" #include "drm.h"
static int done; static int done;
@ -347,6 +348,12 @@ static double l_estimate(igt_stats_t *stats)
return igt_stats_get_mean(stats); return igt_stats_get_mean(stats);
} }
static double cpu_time(const struct rusage *r)
{
return 10e6*(r->ru_utime.tv_sec + r->ru_stime.tv_sec) +
(r->ru_utime.tv_usec + r->ru_stime.tv_usec);
}
#define CONTEXT 1 #define CONTEXT 1
#define REALTIME 2 #define REALTIME 2
static int run(int seconds, static int run(int seconds,
@ -359,6 +366,7 @@ static int run(int seconds,
pthread_attr_t attr; pthread_attr_t attr;
struct producer *p; struct producer *p;
igt_stats_t platency, latency, dispatch; igt_stats_t platency, latency, dispatch;
struct rusage rused;
uint32_t nop_batch; uint32_t nop_batch;
uint32_t workload_batch; uint32_t workload_batch;
uint32_t scratch; uint32_t scratch;
@ -458,12 +466,16 @@ static int run(int seconds,
} }
} }
getrusage(RUSAGE_SELF, &rused);
switch ((flags >> 8) & 0xf) { switch ((flags >> 8) & 0xf) {
default: default:
printf("%d/%d: %7.3fus %7.3fus %7.3fus\n", complete, nrun, printf("%d/%d: %7.3fus %7.3fus %7.3fus %7.3fus\n",
complete, nrun,
CYCLES_TO_US(l_estimate(&dispatch)), CYCLES_TO_US(l_estimate(&dispatch)),
CYCLES_TO_US(l_estimate(&latency)), CYCLES_TO_US(l_estimate(&latency)),
CYCLES_TO_US(l_estimate(&platency))); CYCLES_TO_US(l_estimate(&platency)),
cpu_time(&rused) / complete);
break; break;
case 1: case 1:
printf("%f\n", CYCLES_TO_US(l_estimate(&dispatch))); printf("%f\n", CYCLES_TO_US(l_estimate(&dispatch)));
@ -474,6 +486,9 @@ static int run(int seconds,
case 3: case 3:
printf("%f\n", CYCLES_TO_US(l_estimate(&platency))); printf("%f\n", CYCLES_TO_US(l_estimate(&platency)));
break; break;
case 4:
printf("%f\n", cpu_time(&rused) / complete);
break;
} }
return 0; return 0;