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test: determine number of transactions per second rather than time per transaction

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This way the measurements are not skewed by twoo short total measurement
times, and results become stabler.
This commit is contained in:
Lennart Poettering 2013-06-03 19:44:44 +09:00
parent 02b9e969a6
commit 061b2c4365
1 changed files with 28 additions and 13 deletions
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41
src/libsystemd-bus/test-bus-kernel-benchmark.c
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@ -24,6 +24,7 @@
#include "util.h"
#include "log.h"
#include "time-util.h"
#include "sd-bus.h"
#include "bus-message.h"
@ -31,9 +32,10 @@
#include "bus-kernel.h"
#include "bus-internal.h"
#define N_TRIES 10000
#define MAX_SIZE (1*1024*1024)
static usec_t arg_loop_usec = 10 * USEC_PER_SEC;
static void server(sd_bus *b, size_t *result) {
int r;
@ -107,8 +109,8 @@ static void client(const char *address) {
rsize = MAX_SIZE;
for (;;) {
usec_t copy, memfd, t;
unsigned i;
usec_t t;
unsigned n_copying, n_memfd;
csize = (lsize + rsize) / 2;
@ -122,24 +124,32 @@ static void client(const char *address) {
log_info("copying...");
b->use_memfd = 0;
t = now(CLOCK_MONOTONIC);
for (i = 0; i < N_TRIES; i++)
for (n_copying = 0;; n_copying++) {
transaction(b, csize);
copy = (now(CLOCK_MONOTONIC) - t);
log_info("%llu usec per copy transaction", (unsigned long long) (copy / N_TRIES));
if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
break;
}
log_info("%u copy transactions per second", (unsigned) ((n_copying * USEC_PER_SEC) / arg_loop_usec));
log_info("sending memfd...");
b->use_memfd = -1;
t = now(CLOCK_MONOTONIC);
for (i = 0; i < N_TRIES; i++)
transaction(b, csize);
memfd = (now(CLOCK_MONOTONIC) - t);
log_info("%llu usec per memfd transaction", (unsigned long long) (memfd / N_TRIES));
if (copy == memfd)
t = now(CLOCK_MONOTONIC);
for (n_memfd = 0;; n_memfd++) {
transaction(b, csize);
if (now(CLOCK_MONOTONIC) >= t + arg_loop_usec)
break;
}
log_info("%u memfd transactions per second", (unsigned) ((n_memfd * USEC_PER_SEC) / arg_loop_usec));
if (n_copying == n_memfd)
break;
if (copy < memfd)
if (n_copying > n_memfd)
lsize = csize;
else
rsize = csize;
@ -163,6 +173,11 @@ int main(int argc, char *argv[]) {
log_set_max_level(LOG_DEBUG);
if (argc > 1)
assert_se(parse_sec(argv[1], &arg_loop_usec) >= 0);
assert_se(arg_loop_usec > 0);
bus_ref = bus_kernel_create("deine-mutter", &bus_name);
if (bus_ref == -ENOENT)
exit(EXIT_TEST_SKIP);