From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by sourceware.org (Postfix) with ESMTPS id 204663856DC3 for ; Fri, 22 Apr 2022 00:58:24 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 204663856DC3 X-IronPort-AV: E=McAfee;i="6400,9594,10324"; a="324977248" X-IronPort-AV: E=Sophos;i="5.90,280,1643702400"; d="scan'208";a="324977248" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2022 17:58:22 -0700 X-IronPort-AV: E=Sophos;i="5.90,280,1643702400"; d="scan'208";a="577567097" Received: from changhu-mobl.ccr.corp.intel.com (HELO [10.255.28.50]) ([10.255.28.50]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Apr 2022 17:58:21 -0700 Message-ID: Date: Fri, 22 Apr 2022 08:58:13 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [PATCH v2] benchtests: Add pthread-mutex-locks bench Content-Language: en-US To: Noah Goldstein Cc: GNU C Library , wangyang.guo@intel.com References: <20220420054848.2774374-1-wangyang.guo@intel.com> <20220421032841.3004316-1-wangyang.guo@intel.com> From: "Guo, Wangyang" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-13.9 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Apr 2022 00:58:27 -0000 On 4/21/2022 9:13 PM, Noah Goldstein via Libc-alpha wrote: > On Wed, Apr 20, 2022 at 10:29 PM Wangyang Guo 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. >> >> v2: Fix benchout json schema validation error. >> --- >> benchtests/Makefile | 2 + >> benchtests/bench-pthread-mutex-locks.c | 288 +++++++++++++++++++++++++ >> 2 files changed, 290 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..e934b0001a >> --- /dev/null >> +++ b/benchtests/bench-pthread-mutex-locks.c >> @@ -0,0 +1,288 @@ >> +/* 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 >> + . */ >> + >> +#define TEST_MAIN >> +#define TEST_NAME "pthread-mutex-locks" >> +#define TIMEOUT (20 * 60) >> + >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#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_one (const char *name, 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)); >> + >> + char buf[256]; >> + snprintf (buf, sizeof buf, "%s,non_crt_len=%d,crt_len=%d,threads=%d", name, >> + non_crt_len, crt_len, num_threads); >> + >> + json_attr_object_begin (js, buf); >> + >> + json_attr_double (js, "duration", (double) cur); >> + json_attr_double (js, "iterations", (double) total_iters); >> + 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_attr_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 }; >> + char name[128]; >> + >> + json_init (&json_ctx, 2, stdout); >> + json_attr_object_begin (&json_ctx, "pthread_mutex_locks"); >> + >> + /* 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; >> + >> + pthread_mutexattr_init (&attr); >> + pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_ADAPTIVE_NP); >> + snprintf (name, sizeof name, "type=adaptive"); >> + >> + for (k = 0; k < (sizeof (non_crt_lens) / sizeof (int)); k++) >> + { >> + int non_crt_len = non_crt_lens[k]; >> + for (j = 0; j < (sizeof (crt_lens) / sizeof (int)); j++) >> + { >> + int crt_len = crt_lens[j]; >> + for (i = 0; i < th_conf; i++) >> + { >> + th_num = threads[i]; >> + do_bench_one (name, th_num, crt_len, non_crt_len, &json_ctx); >> + } >> + } >> + } >> + >> + json_attr_object_end (&json_ctx); >> + >> + return rv; >> +} >> + >> +#define TEST_FUNCTION do_bench () >> + >> +#include "../test-skeleton.c" >> -- >> 2.35.1 >> > > Can you run clang-format on this? Otherwise > LGTM. > clang-format done. Nothing needs to change for this patch.