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Benchmarks: Also print ns / iter.

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This is often what we really care about.  It's not easy to do the division
mentally in all cases.
This commit is contained in:
David Goldblatt 2020-08-05 17:39:45 -07:00 committed by David Goldblatt
parent 7b187360e9
commit 753bbf1849
1 changed files with 25 additions and 4 deletions
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29
test/include/test/bench.h
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@ -13,6 +13,20 @@ time_func(timedelta_t *timer, uint64_t nwarmup, uint64_t niter,
timer_stop(timer);
}
#define FMT_NSECS_BUF_SIZE 100
/* Print nanoseconds / iter into the buffer "buf". */
static inline void
fmt_nsecs(uint64_t usec, uint64_t iters, char *buf) {
uint64_t nsec = usec * 1000;
/* We'll display 3 digits after the decimal point. */
uint64_t nsec1000 = nsec * 1000;
uint64_t nsecs_per_iter1000 = nsec1000 / iters;
uint64_t intpart = nsecs_per_iter1000 / 1000;
uint64_t fracpart = nsecs_per_iter1000 % 1000;
malloc_snprintf(buf, FMT_NSECS_BUF_SIZE, "%"FMTu64".%03"FMTu64, intpart,
fracpart);
}
static inline void
compare_funcs(uint64_t nwarmup, uint64_t niter, const char *name_a,
void (*func_a), const char *name_b, void (*func_b)) {
@ -29,11 +43,18 @@ compare_funcs(uint64_t nwarmup, uint64_t niter, const char *name_a,
time_func(&timer_a, nwarmup, niter, func_a);
time_func(&timer_b, nwarmup, niter, func_b);
uint64_t usec_a = timer_usec(&timer_a);
char buf_a[FMT_NSECS_BUF_SIZE];
fmt_nsecs(usec_a, niter, buf_a);
uint64_t usec_b = timer_usec(&timer_b);
char buf_b[FMT_NSECS_BUF_SIZE];
fmt_nsecs(usec_b, niter, buf_b);
timer_ratio(&timer_a, &timer_b, ratio_buf, sizeof(ratio_buf));
malloc_printf("%"FMTu64" iterations, %s=%"FMTu64"us, "
"%s=%"FMTu64"us, ratio=1:%s\n",
niter, name_a, timer_usec(&timer_a), name_b, timer_usec(&timer_b),
ratio_buf);
malloc_printf("%"FMTu64" iterations, %s=%"FMTu64"us (%s ns/iter), "
"%s=%"FMTu64"us (%s ns/iter), ratio=1:%s\n",
niter, name_a, usec_a, buf_a, name_b, usec_b, buf_b, ratio_buf);
dallocx(p, 0);
}