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perf bench futex: Group test parameters cleanup

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Do this across all futex-bench tests such that all program parameters
neatly share a common structure, which is nicer than how we have them
now. No changes in program behavior are expected.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20210809043301.66002-2-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Davidlohr Bueso 2021-08-08 21:32:55 -07:00 committed by Arnaldo Carvalho de Melo
parent f3c33cbd92
commit 0959046303
6 changed files with 162 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
tools/perf/bench/futex-hash.c
View File

@ -29,11 +29,7 @@
#include <err.h>
static unsigned int nthreads = 0;
static unsigned int nsecs = 10;
/* amount of futexes per thread */
static unsigned int nfutexes = 1024;
static bool fshared = false, done = false, silent = false;
static bool done = false;
static int futex_flag = 0;
struct timeval bench__start, bench__end, bench__runtime;
@ -49,12 +45,17 @@ struct worker {
unsigned long ops;
};
static struct bench_futex_parameters params = {
.nfutexes = 1024,
.runtime = 10,
};
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
OPT_UINTEGER('f', "futexes", &nfutexes, "Specify amount of futexes per threads"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_UINTEGER('t', "threads", &params.nthreads, "Specify amount of threads"),
OPT_UINTEGER('r', "runtime", &params.runtime, "Specify runtime (in seconds)"),
OPT_UINTEGER('f', "futexes", &params.nfutexes, "Specify amount of futexes per threads"),
OPT_BOOLEAN( 's', "silent", &params.silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &params.fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@ -78,7 +79,7 @@ static void *workerfn(void *arg)
pthread_mutex_unlock(&thread_lock);
do {
for (i = 0; i < nfutexes; i++, ops++) {
for (i = 0; i < params.nfutexes; i++, ops++) {
/*
* We want the futex calls to fail in order to stress
* the hashing of uaddr and not measure other steps,
@ -86,7 +87,7 @@ static void *workerfn(void *arg)
* the critical region protected by hb->lock.
*/
ret = futex_wait(&w->futex[i], 1234, NULL, futex_flag);
if (!silent &&
if (!params.silent &&
(!ret || errno != EAGAIN || errno != EWOULDBLOCK))
warn("Non-expected futex return call");
}
@ -112,7 +113,7 @@ static void print_summary(void)
double stddev = stddev_stats(&throughput_stats);
printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
!silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
!params.silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
(int)bench__runtime.tv_sec);
}
@ -141,30 +142,30 @@ int bench_futex_hash(int argc, const char **argv)
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);
if (!nthreads) /* default to the number of CPUs */
nthreads = cpu->nr;
if (!params.nthreads) /* default to the number of CPUs */
params.nthreads = cpu->nr;
worker = calloc(nthreads, sizeof(*worker));
worker = calloc(params.nthreads, sizeof(*worker));
if (!worker)
goto errmem;
if (!fshared)
if (!params.fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
printf("Run summary [PID %d]: %d threads, each operating on %d [%s] futexes for %d secs.\n\n",
getpid(), nthreads, nfutexes, fshared ? "shared":"private", nsecs);
getpid(), params.nthreads, params.nfutexes, params.fshared ? "shared":"private", params.runtime);
init_stats(&throughput_stats);
pthread_mutex_init(&thread_lock, NULL);
pthread_cond_init(&thread_parent, NULL);
pthread_cond_init(&thread_worker, NULL);
threads_starting = nthreads;
threads_starting = params.nthreads;
pthread_attr_init(&thread_attr);
gettimeofday(&bench__start, NULL);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
worker[i].tid = i;
worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
worker[i].futex = calloc(params.nfutexes, sizeof(*worker[i].futex));
if (!worker[i].futex)
goto errmem;
@ -189,10 +190,10 @@ int bench_futex_hash(int argc, const char **argv)
pthread_cond_broadcast(&thread_worker);
pthread_mutex_unlock(&thread_lock);
sleep(nsecs);
sleep(params.runtime);
toggle_done(0, NULL, NULL);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
ret = pthread_join(worker[i].thread, NULL);
if (ret)
err(EXIT_FAILURE, "pthread_join");
@ -203,18 +204,18 @@ int bench_futex_hash(int argc, const char **argv)
pthread_cond_destroy(&thread_worker);
pthread_mutex_destroy(&thread_lock);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
unsigned long t = bench__runtime.tv_sec > 0 ?
worker[i].ops / bench__runtime.tv_sec : 0;
update_stats(&throughput_stats, t);
if (!silent) {
if (nfutexes == 1)
if (!params.silent) {
if (params.nfutexes == 1)
printf("[thread %2d] futex: %p [ %ld ops/sec ]\n",
worker[i].tid, &worker[i].futex[0], t);
else
printf("[thread %2d] futexes: %p ... %p [ %ld ops/sec ]\n",
worker[i].tid, &worker[i].futex[0],
&worker[i].futex[nfutexes-1], t);
&worker[i].futex[params.nfutexes-1], t);
}
zfree(&worker[i].futex);

53
tools/perf/bench/futex-lock-pi.c
View File

@ -31,22 +31,23 @@ struct worker {
static u_int32_t global_futex = 0;
static struct worker *worker;
static unsigned int nsecs = 10;
static bool silent = false, multi = false;
static bool done = false, fshared = false;
static unsigned int nthreads = 0;
static bool done = false;
static int futex_flag = 0;
static pthread_mutex_t thread_lock;
static unsigned int threads_starting;
static struct stats throughput_stats;
static pthread_cond_t thread_parent, thread_worker;
static struct bench_futex_parameters params = {
.runtime = 10,
};
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
OPT_UINTEGER('r', "runtime", &nsecs, "Specify runtime (in seconds)"),
OPT_BOOLEAN( 'M', "multi", &multi, "Use multiple futexes"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_UINTEGER('t', "threads", &params.nthreads, "Specify amount of threads"),
OPT_UINTEGER('r', "runtime", &params.runtime, "Specify runtime (in seconds)"),
OPT_BOOLEAN( 'M', "multi", &params.multi, "Use multiple futexes"),
OPT_BOOLEAN( 's', "silent", &params.silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &params.fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@ -61,7 +62,7 @@ static void print_summary(void)
double stddev = stddev_stats(&throughput_stats);
printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
!silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
!params.silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
(int)bench__runtime.tv_sec);
}
@ -93,7 +94,7 @@ static void *workerfn(void *arg)
ret = futex_lock_pi(w->futex, NULL, futex_flag);
if (ret) { /* handle lock acquisition */
if (!silent)
if (!params.silent)
warn("thread %d: Could not lock pi-lock for %p (%d)",
w->tid, w->futex, ret);
if (done)
@ -104,7 +105,7 @@ static void *workerfn(void *arg)
usleep(1);
ret = futex_unlock_pi(w->futex, futex_flag);
if (ret && !silent)
if (ret && !params.silent)
warn("thread %d: Could not unlock pi-lock for %p (%d)",
w->tid, w->futex, ret);
ops++; /* account for thread's share of work */
@ -120,12 +121,12 @@ static void create_threads(struct worker *w, pthread_attr_t thread_attr,
cpu_set_t cpuset;
unsigned int i;
threads_starting = nthreads;
threads_starting = params.nthreads;
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
worker[i].tid = i;
if (multi) {
if (params.multi) {
worker[i].futex = calloc(1, sizeof(u_int32_t));
if (!worker[i].futex)
err(EXIT_FAILURE, "calloc");
@ -164,25 +165,25 @@ int bench_futex_lock_pi(int argc, const char **argv)
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);
if (!nthreads)
nthreads = cpu->nr;
if (!params.nthreads)
params.nthreads = cpu->nr;
worker = calloc(nthreads, sizeof(*worker));
worker = calloc(params.nthreads, sizeof(*worker));
if (!worker)
err(EXIT_FAILURE, "calloc");
if (!fshared)
if (!params.fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n",
getpid(), nthreads, nsecs);
getpid(), params.nthreads, params.runtime);
init_stats(&throughput_stats);
pthread_mutex_init(&thread_lock, NULL);
pthread_cond_init(&thread_parent, NULL);
pthread_cond_init(&thread_worker, NULL);
threads_starting = nthreads;
threads_starting = params.nthreads;
pthread_attr_init(&thread_attr);
gettimeofday(&bench__start, NULL);
@ -195,10 +196,10 @@ int bench_futex_lock_pi(int argc, const char **argv)
pthread_cond_broadcast(&thread_worker);
pthread_mutex_unlock(&thread_lock);
sleep(nsecs);
sleep(params.runtime);
toggle_done(0, NULL, NULL);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
ret = pthread_join(worker[i].thread, NULL);
if (ret)
err(EXIT_FAILURE, "pthread_join");
@ -209,16 +210,16 @@ int bench_futex_lock_pi(int argc, const char **argv)
pthread_cond_destroy(&thread_worker);
pthread_mutex_destroy(&thread_lock);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
unsigned long t = bench__runtime.tv_sec > 0 ?
worker[i].ops / bench__runtime.tv_sec : 0;
update_stats(&throughput_stats, t);
if (!silent)
if (!params.silent)
printf("[thread %3d] futex: %p [ %ld ops/sec ]\n",
worker[i].tid, worker[i].futex, t);
if (multi)
if (params.multi)
zfree(&worker[i].futex);
}

65
tools/perf/bench/futex-requeue.c
View File

@ -30,25 +30,27 @@
static u_int32_t futex1 = 0, futex2 = 0;
/*
* How many tasks to requeue at a time.
* Default to 1 in order to make the kernel work more.
*/
static unsigned int nrequeue = 1;
static pthread_t *worker;
static bool done = false, silent = false, fshared = false;
static bool done = false;
static pthread_mutex_t thread_lock;
static pthread_cond_t thread_parent, thread_worker;
static struct stats requeuetime_stats, requeued_stats;
static unsigned int threads_starting, nthreads = 0;
static unsigned int threads_starting;
static int futex_flag = 0;
static struct bench_futex_parameters params = {
/*
* How many tasks to requeue at a time.
* Default to 1 in order to make the kernel work more.
*/
.nrequeue = 1,
};
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
OPT_UINTEGER('q', "nrequeue", &nrequeue, "Specify amount of threads to requeue at once"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_UINTEGER('t', "threads", &params.nthreads, "Specify amount of threads"),
OPT_UINTEGER('q', "nrequeue", &params.nrequeue, "Specify amount of threads to requeue at once"),
OPT_BOOLEAN( 's', "silent", &params.silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &params.fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@ -65,7 +67,7 @@ static void print_summary(void)
printf("Requeued %d of %d threads in %.4f ms (+-%.2f%%)\n",
requeued_avg,
nthreads,
params.nthreads,
requeuetime_avg / USEC_PER_MSEC,
rel_stddev_stats(requeuetime_stddev, requeuetime_avg));
}
@ -89,10 +91,10 @@ static void block_threads(pthread_t *w,
cpu_set_t cpuset;
unsigned int i;
threads_starting = nthreads;
threads_starting = params.nthreads;
/* create and block all threads */
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
CPU_ZERO(&cpuset);
CPU_SET(cpu->map[i % cpu->nr], &cpuset);
@ -132,22 +134,22 @@ int bench_futex_requeue(int argc, const char **argv)
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);
if (!nthreads)
nthreads = cpu->nr;
if (!params.nthreads)
params.nthreads = cpu->nr;
worker = calloc(nthreads, sizeof(*worker));
worker = calloc(params.nthreads, sizeof(*worker));
if (!worker)
err(EXIT_FAILURE, "calloc");
if (!fshared)
if (!params.fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
if (nrequeue > nthreads)
nrequeue = nthreads;
if (params.nrequeue > params.nthreads)
params.nrequeue = params.nthreads;
printf("Run summary [PID %d]: Requeuing %d threads (from [%s] %p to %p), "
"%d at a time.\n\n", getpid(), nthreads,
fshared ? "shared":"private", &futex1, &futex2, nrequeue);
"%d at a time.\n\n", getpid(), params.nthreads,
params.fshared ? "shared":"private", &futex1, &futex2, params.nrequeue);
init_stats(&requeued_stats);
init_stats(&requeuetime_stats);
@ -174,13 +176,14 @@ int bench_futex_requeue(int argc, const char **argv)
/* Ok, all threads are patiently blocked, start requeueing */
gettimeofday(&start, NULL);
while (nrequeued < nthreads) {
while (nrequeued < params.nthreads) {
/*
* Do not wakeup any tasks blocked on futex1, allowing
* us to really measure futex_wait functionality.
*/
nrequeued += futex_cmp_requeue(&futex1, 0, &futex2, 0,
nrequeue, futex_flag);
params.nrequeue,
futex_flag);
}
gettimeofday(&end, NULL);
@ -189,17 +192,19 @@ int bench_futex_requeue(int argc, const char **argv)
update_stats(&requeued_stats, nrequeued);
update_stats(&requeuetime_stats, runtime.tv_usec);
if (!silent) {
if (!params.silent) {
printf("[Run %d]: Requeued %d of %d threads in %.4f ms\n",
j + 1, nrequeued, nthreads, runtime.tv_usec / (double)USEC_PER_MSEC);
j + 1, nrequeued, params.nthreads,
runtime.tv_usec / (double)USEC_PER_MSEC);
}
/* everybody should be blocked on futex2, wake'em up */
nrequeued = futex_wake(&futex2, nrequeued, futex_flag);
if (nthreads != nrequeued)
warnx("couldn't wakeup all tasks (%d/%d)", nrequeued, nthreads);
if (params.nthreads != nrequeued)
warnx("couldn't wakeup all tasks (%d/%d)",
nrequeued, params.nthreads);
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
ret = pthread_join(worker[i], NULL);
if (ret)
err(EXIT_FAILURE, "pthread_join");

58
tools/perf/bench/futex-wake-parallel.c
View File

@ -47,8 +47,7 @@ static unsigned int nwakes = 1;
static u_int32_t futex = 0;
static pthread_t *blocked_worker;
static bool done = false, silent = false, fshared = false;
static unsigned int nblocked_threads = 0, nwaking_threads = 0;
static bool done = false;
static pthread_mutex_t thread_lock;
static pthread_cond_t thread_parent, thread_worker;
static pthread_barrier_t barrier;
@ -56,11 +55,13 @@ static struct stats waketime_stats, wakeup_stats;
static unsigned int threads_starting;
static int futex_flag = 0;
static struct bench_futex_parameters params;
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nblocked_threads, "Specify amount of threads"),
OPT_UINTEGER('w', "nwakers", &nwaking_threads, "Specify amount of waking threads"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_UINTEGER('t', "threads", &params.nthreads, "Specify amount of threads"),
OPT_UINTEGER('w', "nwakers", &params.nwakes, "Specify amount of waking threads"),
OPT_BOOLEAN( 's', "silent", &params.silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &params.fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@ -96,10 +97,10 @@ static void wakeup_threads(struct thread_data *td, pthread_attr_t thread_attr)
pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_JOINABLE);
pthread_barrier_init(&barrier, NULL, nwaking_threads + 1);
pthread_barrier_init(&barrier, NULL, params.nwakes + 1);
/* create and block all threads */
for (i = 0; i < nwaking_threads; i++) {
for (i = 0; i < params.nwakes; i++) {
/*
* Thread creation order will impact per-thread latency
* as it will affect the order to acquire the hb spinlock.
@ -112,7 +113,7 @@ static void wakeup_threads(struct thread_data *td, pthread_attr_t thread_attr)
pthread_barrier_wait(&barrier);
for (i = 0; i < nwaking_threads; i++)
for (i = 0; i < params.nwakes; i++)
if (pthread_join(td[i].worker, NULL))
err(EXIT_FAILURE, "pthread_join");
@ -143,10 +144,10 @@ static void block_threads(pthread_t *w, pthread_attr_t thread_attr,
cpu_set_t cpuset;
unsigned int i;
threads_starting = nblocked_threads;
threads_starting = params.nthreads;
/* create and block all threads */
for (i = 0; i < nblocked_threads; i++) {
for (i = 0; i < params.nthreads; i++) {
CPU_ZERO(&cpuset);
CPU_SET(cpu->map[i % cpu->nr], &cpuset);
@ -167,7 +168,7 @@ static void print_run(struct thread_data *waking_worker, unsigned int run_num)
init_stats(&__wakeup_stats);
init_stats(&__waketime_stats);
for (i = 0; i < nwaking_threads; i++) {
for (i = 0; i < params.nwakes; i++) {
update_stats(&__waketime_stats, waking_worker[i].runtime.tv_usec);
update_stats(&__wakeup_stats, waking_worker[i].nwoken);
}
@ -178,7 +179,7 @@ static void print_run(struct thread_data *waking_worker, unsigned int run_num)
printf("[Run %d]: Avg per-thread latency (waking %d/%d threads) "
"in %.4f ms (+-%.2f%%)\n", run_num + 1, wakeup_avg,
nblocked_threads, waketime_avg / USEC_PER_MSEC,
params.nthreads, waketime_avg / USEC_PER_MSEC,
rel_stddev_stats(waketime_stddev, waketime_avg));
}
@ -193,7 +194,7 @@ static void print_summary(void)
printf("Avg per-thread latency (waking %d/%d threads) in %.4f ms (+-%.2f%%)\n",
wakeup_avg,
nblocked_threads,
params.nthreads,
waketime_avg / USEC_PER_MSEC,
rel_stddev_stats(waketime_stddev, waketime_avg));
}
@ -203,7 +204,7 @@ static void do_run_stats(struct thread_data *waking_worker)
{
unsigned int i;
for (i = 0; i < nwaking_threads; i++) {
for (i = 0; i < params.nwakes; i++) {
update_stats(&waketime_stats, waking_worker[i].runtime.tv_usec);
update_stats(&wakeup_stats, waking_worker[i].nwoken);
}
@ -242,32 +243,33 @@ int bench_futex_wake_parallel(int argc, const char **argv)
if (!cpu)
err(EXIT_FAILURE, "calloc");
if (!nblocked_threads)
nblocked_threads = cpu->nr;
if (!params.nthreads)
params.nthreads = cpu->nr;
/* some sanity checks */
if (nwaking_threads > nblocked_threads || !nwaking_threads)
nwaking_threads = nblocked_threads;
if (params.nwakes > params.nthreads ||
!params.nwakes)
params.nwakes = params.nthreads;
if (nblocked_threads % nwaking_threads)
if (params.nthreads % params.nwakes)
errx(EXIT_FAILURE, "Must be perfectly divisible");
/*
* Each thread will wakeup nwakes tasks in
* a single futex_wait call.
*/
nwakes = nblocked_threads/nwaking_threads;
nwakes = params.nthreads/params.nwakes;
blocked_worker = calloc(nblocked_threads, sizeof(*blocked_worker));
blocked_worker = calloc(params.nthreads, sizeof(*blocked_worker));
if (!blocked_worker)
err(EXIT_FAILURE, "calloc");
if (!fshared)
if (!params.fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
printf("Run summary [PID %d]: blocking on %d threads (at [%s] "
"futex %p), %d threads waking up %d at a time.\n\n",
getpid(), nblocked_threads, fshared ? "shared":"private",
&futex, nwaking_threads, nwakes);
getpid(), params.nthreads, params.fshared ? "shared":"private",
&futex, params.nwakes, nwakes);
init_stats(&wakeup_stats);
init_stats(&waketime_stats);
@ -278,7 +280,7 @@ int bench_futex_wake_parallel(int argc, const char **argv)
pthread_cond_init(&thread_worker, NULL);
for (j = 0; j < bench_repeat && !done; j++) {
waking_worker = calloc(nwaking_threads, sizeof(*waking_worker));
waking_worker = calloc(params.nwakes, sizeof(*waking_worker));
if (!waking_worker)
err(EXIT_FAILURE, "calloc");
@ -297,14 +299,14 @@ int bench_futex_wake_parallel(int argc, const char **argv)
/* Ok, all threads are patiently blocked, start waking folks up */
wakeup_threads(waking_worker, thread_attr);
for (i = 0; i < nblocked_threads; i++) {
for (i = 0; i < params.nthreads; i++) {
ret = pthread_join(blocked_worker[i], NULL);
if (ret)
err(EXIT_FAILURE, "pthread_join");
}
do_run_stats(waking_worker);
if (!silent)
if (!params.silent)
print_run(waking_worker, j);
free(waking_worker);

57
tools/perf/bench/futex-wake.c
View File

@ -31,25 +31,27 @@
/* all threads will block on the same futex */
static u_int32_t futex1 = 0;
/*
* How many wakeups to do at a time.
* Default to 1 in order to make the kernel work more.
*/
static unsigned int nwakes = 1;
pthread_t *worker;
static bool done = false, silent = false, fshared = false;
static pthread_t *worker;
static bool done = false;
static pthread_mutex_t thread_lock;
static pthread_cond_t thread_parent, thread_worker;
static struct stats waketime_stats, wakeup_stats;
static unsigned int threads_starting, nthreads = 0;
static unsigned int threads_starting;
static int futex_flag = 0;
static struct bench_futex_parameters params = {
/*
* How many wakeups to do at a time.
* Default to 1 in order to make the kernel work more.
*/
.nwakes = 1,
};
static const struct option options[] = {
OPT_UINTEGER('t', "threads", &nthreads, "Specify amount of threads"),
OPT_UINTEGER('w', "nwakes", &nwakes, "Specify amount of threads to wake at once"),
OPT_BOOLEAN( 's', "silent", &silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &fshared, "Use shared futexes instead of private ones"),
OPT_UINTEGER('t', "threads", &params.nthreads, "Specify amount of threads"),
OPT_UINTEGER('w', "nwakes", &params.nwakes, "Specify amount of threads to wake at once"),
OPT_BOOLEAN( 's', "silent", &params.silent, "Silent mode: do not display data/details"),
OPT_BOOLEAN( 'S', "shared", &params.fshared, "Use shared futexes instead of private ones"),
OPT_END()
};
@ -84,7 +86,7 @@ static void print_summary(void)
printf("Wokeup %d of %d threads in %.4f ms (+-%.2f%%)\n",
wakeup_avg,
nthreads,
params.nthreads,
waketime_avg / USEC_PER_MSEC,
rel_stddev_stats(waketime_stddev, waketime_avg));
}
@ -95,10 +97,10 @@ static void block_threads(pthread_t *w,
cpu_set_t cpuset;
unsigned int i;
threads_starting = nthreads;
threads_starting = params.nthreads;
/* create and block all threads */
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
CPU_ZERO(&cpuset);
CPU_SET(cpu->map[i % cpu->nr], &cpuset);
@ -140,19 +142,20 @@ int bench_futex_wake(int argc, const char **argv)
act.sa_sigaction = toggle_done;
sigaction(SIGINT, &act, NULL);
if (!nthreads)
nthreads = cpu->nr;
if (!params.nthreads)
params.nthreads = cpu->nr;
worker = calloc(nthreads, sizeof(*worker));
worker = calloc(params.nthreads, sizeof(*worker));
if (!worker)
err(EXIT_FAILURE, "calloc");
if (!fshared)
if (!params.fshared)
futex_flag = FUTEX_PRIVATE_FLAG;
printf("Run summary [PID %d]: blocking on %d threads (at [%s] futex %p), "
"waking up %d at a time.\n\n",
getpid(), nthreads, fshared ? "shared":"private", &futex1, nwakes);
getpid(), params.nthreads, params.fshared ? "shared":"private",
&futex1, params.nwakes);
init_stats(&wakeup_stats);
init_stats(&waketime_stats);
@ -179,20 +182,22 @@ int bench_futex_wake(int argc, const char **argv)
/* Ok, all threads are patiently blocked, start waking folks up */
gettimeofday(&start, NULL);
while (nwoken != nthreads)
nwoken += futex_wake(&futex1, nwakes, futex_flag);
while (nwoken != params.nthreads)
nwoken += futex_wake(&futex1,
params.nwakes, futex_flag);
gettimeofday(&end, NULL);
timersub(&end, &start, &runtime);
update_stats(&wakeup_stats, nwoken);
update_stats(&waketime_stats, runtime.tv_usec);
if (!silent) {
if (!params.silent) {
printf("[Run %d]: Wokeup %d of %d threads in %.4f ms\n",
j + 1, nwoken, nthreads, runtime.tv_usec / (double)USEC_PER_MSEC);
j + 1, nwoken, params.nthreads,
runtime.tv_usec / (double)USEC_PER_MSEC);
}
for (i = 0; i < nthreads; i++) {
for (i = 0; i < params.nthreads; i++) {
ret = pthread_join(worker[i], NULL);
if (ret)
err(EXIT_FAILURE, "pthread_join");

11
tools/perf/bench/futex.h
View File

@ -13,6 +13,17 @@
#include <sys/types.h>
#include <linux/futex.h>
struct bench_futex_parameters {
bool silent;
bool fshared;
bool multi; /* lock-pi */
unsigned int runtime; /* seconds*/
unsigned int nthreads;
unsigned int nfutexes;
unsigned int nwakes;
unsigned int nrequeue;
};
/**
* futex() - SYS_futex syscall wrapper
* @uaddr: address of first futex