From: Noah Goldstein <goldstein.w.n@gmail.com>
To: Wangyang Guo <wangyang.guo@intel.com>
Cc: GNU C Library <libc-alpha@sourceware.org>,
"H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: [PATCH] benchtests: Add pthread-mutex-locks bench
Date: Wed, 20 Apr 2022 12:57:51 -0500 [thread overview]
Message-ID: <CAFUsyfKbvyoNW6OijQGh+bK+TwSSwUbWoOkVzmJ9=hhoF5BJrg@mail.gmail.com> (raw)
In-Reply-To: <20220420054848.2774374-1-wangyang.guo@intel.com>
On Wed, Apr 20, 2022 at 12:49 AM Wangyang Guo <wangyang.guo@intel.com> wrote:
>
> Benchmark for testing pthread mutex locks performance with different
> threads and critical sections.
>
> The test configuration consists of 3 parts:
> 1. thread number
> 2. critical-section length
> 3. non-critical-section length
>
> Thread number starts from 1 and increased by 2x until num of CPU cores
> (nprocs). An additional over-saturation case (1.25 * nprocs) is also
> included.
> Critical-section is represented by a loop of shared do_filler(),
> length can be determined by the loop iters.
> Non-critical-section is similiar to the critical-section, except it's
> based on non-shared do_filler().
>
> Currently, adaptive pthread_mutex lock is tested.
> ---
> benchtests/Makefile | 2 +
> benchtests/bench-pthread-mutex-locks.c | 297 +++++++++++++++++++++++++
> 2 files changed, 299 insertions(+)
> create mode 100644 benchtests/bench-pthread-mutex-locks.c
>
> diff --git a/benchtests/Makefile b/benchtests/Makefile
> index 8dfca592fd..b477042e6c 100644
> --- a/benchtests/Makefile
> +++ b/benchtests/Makefile
> @@ -102,6 +102,7 @@ endif
>
> bench-pthread := \
> pthread-locks \
> + pthread-mutex-locks \
> pthread_once \
> thread_create \
> # bench-pthread
> @@ -281,6 +282,7 @@ $(addprefix $(objpfx)bench-,$(math-benchset)): $(libm-benchtests)
> $(addprefix $(objpfx)bench-,$(bench-pthread)): $(thread-library-benchtests)
> $(addprefix $(objpfx)bench-,$(bench-malloc)): $(thread-library-benchtests)
> $(addprefix $(objpfx)bench-,pthread-locks): $(libm-benchtests)
> +$(addprefix $(objpfx)bench-,pthread-mutex-locks): $(libm-benchtests)
>
>
>
> diff --git a/benchtests/bench-pthread-mutex-locks.c b/benchtests/bench-pthread-mutex-locks.c
> new file mode 100644
> index 0000000000..76f7b43635
> --- /dev/null
> +++ b/benchtests/bench-pthread-mutex-locks.c
> @@ -0,0 +1,297 @@
> +/* Measure mutex_lock for different threads and critical sections.
> + Copyright (C) 2020-2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define TEST_MAIN
> +#define TEST_NAME "pthread-mutex-locks"
> +#define TIMEOUT (20 * 60)
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <math.h>
> +#include <pthread.h>
> +#include <sys/time.h>
> +#include <sys/sysinfo.h>
> +#include "bench-timing.h"
> +#include "json-lib.h"
> +
> +static pthread_mutex_t lock;
> +static pthread_mutexattr_t attr;
> +static pthread_barrier_t barrier;
> +
> +#define START_ITERS 1000
> +
> +#pragma GCC push_options
> +#pragma GCC optimize(1)
> +
> +static int __attribute__ ((noinline)) fibonacci (int i)
> +{
> + asm("");
> + if (i > 2)
> + return fibonacci (i - 1) + fibonacci (i - 2);
> + return 10 + i;
> +}
> +
> +static void
> +do_filler (void)
> +{
> + char buf1[512], buf2[512];
> + int f = fibonacci (4);
> + memcpy (buf1, buf2, f);
> +}
> +
> +static void
> +do_filler_shared (void)
> +{
> + static char buf1[512], buf2[512];
> + int f = fibonacci (4);
> + memcpy (buf1, buf2, f);
> +}
> +
> +#pragma GCC pop_options
> +
> +#define UNIT_WORK_CRT do_filler_shared ()
> +#define UNIT_WORK_NON_CRT do_filler ()
> +
> +static inline void
> +critical_section (int length)
> +{
> + for (int i = length; i >= 0; i--)
> + UNIT_WORK_CRT;
> +}
> +
> +static inline void
> +non_critical_section (int length)
> +{
> + for (int i = length; i >= 0; i--)
> + UNIT_WORK_NON_CRT;
> +}
> +
> +typedef struct Worker_Params
> +{
> + long iters;
> + int crt_len;
> + int non_crt_len;
> + timing_t duration;
> +} Worker_Params;
> +
> +static void *
> +worker (void *v)
> +{
> + timing_t start, stop;
> + Worker_Params *p = (Worker_Params *) v;
> + long iters = p->iters;
> + int crt_len = p->crt_len;
> + int non_crt_len = p->non_crt_len;
> +
> + pthread_barrier_wait (&barrier);
> + TIMING_NOW (start);
> + while (iters--)
> + {
> + pthread_mutex_lock (&lock);
> + critical_section (crt_len);
> + pthread_mutex_unlock (&lock);
> + non_critical_section (non_crt_len);
> + }
> + TIMING_NOW (stop);
> +
> + TIMING_DIFF (p->duration, start, stop);
> + return NULL;
> +}
> +
> +static double
> +do_one_test (int num_threads, int crt_len, int non_crt_len, long iters)
> +{
> + int i;
> + timing_t mean;
> + Worker_Params *p, params[num_threads];
> + pthread_t threads[num_threads];
> +
> + pthread_mutex_init (&lock, &attr);
> + pthread_barrier_init (&barrier, NULL, num_threads);
> +
> + for (i = 0; i < num_threads; i++)
> + {
> + p = ¶ms[i];
> + p->iters = iters;
> + p->crt_len = crt_len;
> + p->non_crt_len = non_crt_len;
> + pthread_create (&threads[i], NULL, worker, (void *) p);
> + }
> + for (i = 0; i < num_threads; i++)
> + pthread_join (threads[i], NULL);
> +
> + pthread_mutex_destroy (&lock);
> + pthread_barrier_destroy (&barrier);
> +
> + mean = 0;
> + for (i = 0; i < num_threads; i++)
> + mean += params[i].duration;
> + mean /= num_threads;
> + return mean;
> +}
> +
> +#define RUN_COUNT 10
> +#define MIN_TEST_SEC 0.01
> +
> +static void
> +do_bench_1 (int num_threads, int crt_len, int non_crt_len, json_ctx_t *js)
> +{
> + timing_t cur;
> + struct timeval ts, te;
> + double tsd, ted, td;
> + long iters, iters_limit, total_iters;
> + timing_t curs[RUN_COUNT + 2];
> + int i, j;
> + double mean, stdev;
> +
> + iters = START_ITERS;
> + iters_limit = LONG_MAX / 100;
> +
> + while (1)
> + {
> + gettimeofday (&ts, NULL);
> + cur = do_one_test (num_threads, crt_len, non_crt_len, iters);
> + gettimeofday (&te, NULL);
> + /* Make sure the test to run at least MIN_TEST_SEC. */
> + tsd = ts.tv_sec + ts.tv_usec / 1000000.0;
> + ted = te.tv_sec + te.tv_usec / 1000000.0;
> + td = ted - tsd;
> + if (td >= MIN_TEST_SEC || iters >= iters_limit)
> + break;
> +
> + iters *= 10;
> + }
> +
> + curs[0] = cur;
> + for (i = 1; i < RUN_COUNT + 2; i++)
> + curs[i] = do_one_test (num_threads, crt_len, non_crt_len, iters);
> +
> + /* Sort the results so we can discard the fastest and slowest
> + times as outliers. */
> + for (i = 0; i < RUN_COUNT + 1; i++)
> + for (j = i + 1; j < RUN_COUNT + 2; j++)
> + if (curs[i] > curs[j])
> + {
> + timing_t temp = curs[i];
> + curs[i] = curs[j];
> + curs[j] = temp;
> + }
> +
> + /* Calculate mean and standard deviation. */
> + mean = 0.0;
> + total_iters = iters * num_threads;
> + for (i = 1; i < RUN_COUNT + 1; i++)
> + mean += (double) curs[i] / (double) total_iters;
> + mean /= RUN_COUNT;
> +
> + stdev = 0.0;
> + for (i = 1; i < RUN_COUNT + 1; i++)
> + {
> + double s = (double) curs[i] / (double) total_iters - mean;
> + stdev += s * s;
> + }
> + stdev = sqrt (stdev / (RUN_COUNT - 1));
> +
> + json_element_object_begin (js);
> + json_attr_uint (js, "thread", num_threads);
> + json_attr_double (js, "mean", mean);
> + json_attr_double (js, "stdev", stdev);
> + json_attr_double (js, "min-outlier",
> + (double) curs[0] / (double) total_iters);
> + json_attr_double (js, "min", (double) curs[1] / (double) total_iters);
> + json_attr_double (js, "max",
> + (double) curs[RUN_COUNT] / (double) total_iters);
> + json_attr_double (js, "max-outlier",
> + (double) curs[RUN_COUNT + 1] / (double) total_iters);
> + json_element_object_end (js);
> +}
> +
> +#define TH_CONF_MAX 10
> +
> +int
> +do_bench (void)
> +{
> + int rv = 0;
> + json_ctx_t json_ctx;
> + int i, j, k;
> + int th_num, th_conf, nprocs;
> + int threads[TH_CONF_MAX];
> + int crt_lens[] = { 0, 1, 2, 4, 8, 16, 32, 64, 128 };
> + int non_crt_lens[] = { 1, 32, 128 };
> +
> + json_init (&json_ctx, 2, stdout);
> + json_document_begin (&json_ctx);
> + json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
> +
> + /* The thread config begins from 1, and increases by 2x until nprocs.
> + We also wants to test over-saturation case (1.25*nprocs). */
> + nprocs = get_nprocs ();
> + th_num = 1;
> + for (th_conf = 0; th_conf < (TH_CONF_MAX - 2) && th_num < nprocs; th_conf++)
> + {
> + threads[th_conf] = th_num;
> + th_num <<= 1;
> + }
> + threads[th_conf++] = nprocs;
> + threads[th_conf++] = nprocs + nprocs / 4;
> +
> + json_array_begin (&json_ctx, "threads");
> + for (i = 0; i < th_conf; i++)
> + json_element_int (&json_ctx, threads[i]);
> + json_array_end (&json_ctx);
> +
> + pthread_mutexattr_init (&attr);
> + pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
> + json_attr_string (&json_ctx, "lock-type", "adaptive-mutex");
> +
> + json_array_begin (&json_ctx, "non-critical-sections");
> + for (k = 0; k < (sizeof (non_crt_lens) / sizeof (int)); k++)
> + {
> + int non_crt_len = non_crt_lens[k];
> + json_element_object_begin (&json_ctx);
> + json_attr_uint (&json_ctx, "non-critical-length", non_crt_len);
> + json_array_begin (&json_ctx, "critical-sections");
> + for (j = 0; j < (sizeof (crt_lens) / sizeof (int)); j++)
> + {
> + int crt_len = crt_lens[j];
> + json_element_object_begin (&json_ctx);
> + json_attr_uint (&json_ctx, "critical-length", crt_len);
> + json_array_begin (&json_ctx, "results");
> + for (i = 0; i < th_conf; i++)
> + {
> + th_num = threads[i];
> + do_bench_1 (th_num, crt_len, non_crt_len, &json_ctx);
> + }
> + json_array_end (&json_ctx);
> + json_element_object_end (&json_ctx);
> + }
> + json_array_end (&json_ctx);
> + json_element_object_end (&json_ctx);
> + }
> + json_array_end (&json_ctx);
> +
> + json_document_end (&json_ctx);
> +
> + return rv;
> +}
> +
> +#define TEST_FUNCTION do_bench ()
> +
> +#include "../test-skeleton.c"
> --
> 2.35.1
>
When I run this I get the following error:
$> (cd /home/noah/programs/opensource/glibc-dev/build/glibc/; unset
LD_LIBRARY_PATH; make --silent; make bench
BENCHSET="bench-pthread";);
Running /home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-pthread-locks
Running /home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-pthread-mutex-locks
Running /home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-pthread_once
Running /home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-thread_create
Benchmark output in
/home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench.out
is not JSON.
make[1]: *** [Makefile:412: bench-func] Error 65
rm /home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-thread_create.c
/home/noah/programs/opensource/glibc-dev/build/glibc/benchtests/bench-pthread_once.c
make[1]: Leaving directory
'/home/noah/programs/opensource/glibc-dev/src/glibc/benchtests'
make: *** [Makefile:16: bench] Error 2
next prev parent reply other threads:[~2022-04-20 17:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-20 5:48 Wangyang Guo
2022-04-20 17:57 ` Noah Goldstein [this message]
2022-04-21 1:47 ` Guo, Wangyang
2022-04-21 3:28 ` [PATCH v2] " Wangyang Guo
2022-04-21 13:13 ` Noah Goldstein
2022-04-22 0:58 ` Guo, Wangyang
2022-04-24 3:04 ` Noah Goldstein
2022-04-27 20:38 ` H.J. Lu
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