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Magalhaes'" , Noah Goldstein , Wilco Dijkstra , "libc-alpha@sourceware.org" Subject: RE: [PATCH v3 2/5] benchtests: Add memset zero fill benchtest Thread-Topic: [PATCH v3 2/5] benchtests: Add memset zero fill benchtest Thread-Index: AQHXic6jy6USnJyx5kO37MI1gLA1squd9IkAgANfZaA= Date: Mon, 13 Sep 2021 00:53:22 +0000 Message-ID: References: <20210805074733.433430-1-naohirot@fujitsu.com> <20210805075053.433538-1-naohirot@fujitsu.com> <163130642274.404689.6991051609396665932@localhost.localdomain> In-Reply-To: <163130642274.404689.6991051609396665932@localhost.localdomain> Accept-Language: en-001, ja-JP, en-US Content-Language: ja-JP X-MS-Has-Attach: X-MS-TNEF-Correlator: x-securitypolicycheck: OK by SHieldMailChecker v2.6.3 x-shieldmailcheckermailid: 318d00f49582402ab3869380f7660021 msip_labels: MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_Enabled=True; MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_SiteId=a19f121d-81e1-4858-a9d8-736e267fd4c7; MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_SetDate=2021-09-13T00:51:59.426Z; 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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TYAPR01MB6025.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5111cb93-0b47-4d04-a996-08d97650e321 X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Sep 2021 00:53:22.8840 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: uExXE4iOae6Sxq56O1EHiZWE0fKghJlJoV897c2N0Ac9IE9QROLf0aNnGnKbiCXnk0+iK8V1vUOkUcmY/+qf0Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY2PR01MB2714 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: , From: naohirot--- via Libc-alpha Reply-To: "naohirot@fujitsu.com" Errors-To: libc-alpha-bounces+e=80x24.org@sourceware.org Sender: "Libc-alpha" Hi Lucas, > From: Lucas A. M. Magalhaes > Sent: Saturday, September 11, 2021 5:40 AM >=20 > Thanks for working on this. Please, correct me if I'm wrong but I guess y= ou sent > an old version by mistake. This patch is lacking the bench-variant > implementations mentioned on the commit message. Thank you for the comment! I double checked the source code and confirmed it is the one I intended. 4 patterns are combination of json attribute "char1" and "char2". "char1" and "char2" varies 0 and 1 respectively. zero-over-zero: char1=3D0, char2=3D0 zero-over-one: char1=3D0, char2=3D1 one-over-zero: char1=3D1, char2=3D0 one-over-one: char1=3D1, char2=3D1 I made a comment inline too. BTW, could you review the patch "benchtests: Remove redundant assert.h" [1] that is reflected your comment [2] to other bench tests if you had time? [1] https://sourceware.org/pipermail/libc-alpha/2021-August/129840.html [2] https://sourceware.org/pipermail/libc-alpha/2021-July/128989.html >=20 > Quoting Naohiro Tamura (2021-08-05 04:50:53) > > Memset takes 0 as the second parameter in most cases. > > However, we cannot measure the zero fill performance by > > bench-memset.c, bench-memset-large.c and bench-memset-walk.c > > precisely. > > X86_64 micro-architecture has some zero-over-zero optimization, and > > AArch64 micro-architecture also has some optimization for DC ZVA > > instruction. > > This patch provides bench-memset-zerofill.c which is suitable to > > analyze the zero fill performance by comparing among 4 patterns, > > zero-over-zero, zero-over-one, one-over-zero and one-over-one, from > > 256B to 64MB(RAM) through L1, L2 and L3 caches. > > > > The following commands are examples to analyze a JSON output, > > bench-memset-zerofill.out, by 'jq' and 'plot_strings.py'. > > > > 1) compare zero-over-zero performance > > > > $ cat bench-memset-zerofill.out | \ > > jq -r ' > > .functions.memset."bench-variant"=3D"zerofill-0o0" | > > del(.functions.memset.results[] | select(.char1 !=3D 0 or .char2 != =3D 0)) > > ' | \ > > plot_strings.py -l -p thru -v - > > > > 2) compare zero paformance > > > > $ cat bench-memset-zerofill.out | \ > > jq -r ' > > .functions.memset."bench-variant"=3D"zerofill-zero" | > > del(.functions.memset.results[] | select(.char2 !=3D 0)) > > ' | \ > > plot_strings.py -l -p thru -v - > > > > 3) compare nonzero paformance > > > > $ cat bench-memset-zerofill.out | \ > > jq -r ' > > .functions.memset."bench-variant"=3D"zerofill-nonzero" | > > del(.functions.memset.results[] | select(.char2 =3D=3D 0)) > > ' | \ > > plot_strings.py -l -p thru -v - > > --- > > benchtests/Makefile | 2 +- > > benchtests/bench-memset-zerofill.c | 134 +++++++++++++++++++++++++++++ > > 2 files changed, 135 insertions(+), 1 deletion(-) > > create mode 100644 benchtests/bench-memset-zerofill.c > > > > diff --git a/benchtests/Makefile b/benchtests/Makefile > > index 1530939a8ce8..21b95c736190 100644 > > --- a/benchtests/Makefile > > +++ b/benchtests/Makefile > > @@ -53,7 +53,7 @@ string-benchset :=3D memccpy memchr memcmp memcpy mem= mem memmove \ > > strncasecmp strncat strncmp strncpy strnlen strpbrk = strrchr \ > > strspn strstr strcpy_chk stpcpy_chk memrchr strsep s= trtok \ > > strcoll memcpy-large memcpy-random memmove-large mem= set-large \ > > - memcpy-walk memset-walk memmove-walk > > + memcpy-walk memset-walk memmove-walk memset-zerofill > > > > # Build and run locale-dependent benchmarks only if we're building nat= ively. > > ifeq (no,$(cross-compiling)) > > diff --git a/benchtests/bench-memset-zerofill.c b/benchtests/bench-mems= et-zerofill.c > > new file mode 100644 > > index 000000000000..7aa7fe048574 > > --- /dev/null > > +++ b/benchtests/bench-memset-zerofill.c > > @@ -0,0 +1,134 @@ > > +/* Measure memset functions with zero fill data. > > + Copyright (C) 2021 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 "memset" > > +#define START_SIZE 256 > > +#define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024) > > +#define TIMEOUT (20 * 60) > > +#include "bench-string.h" > > + > > +#include "json-lib.h" > > + > > +void *generic_memset (void *, int, size_t); > > +typedef void *(*proto_t) (void *, int, size_t); > > + > > +IMPL (MEMSET, 1) > > +IMPL (generic_memset, 0) > > + > > +static void > > +__attribute__((noinline, noclone)) > > +do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, > > + int c1 __attribute ((unused)), int c2 __attribute ((unused= )), > > + size_t n) > > +{ > > + size_t i, iters =3D 32; > > + timing_t start, stop, cur, latency =3D 0; > > + > > + CALL (impl, s, c2, n); // warm up > > + > > + for (i =3D 0; i < iters; i++) > > + { > > + memset (s, c1, n); // alternation > > + > > + TIMING_NOW (start); > > + > > + CALL (impl, s, c2, n); > > + > > + TIMING_NOW (stop); > > + TIMING_DIFF (cur, start, stop); > > + TIMING_ACCUM (latency, cur); > > + } > > + > > + json_element_double (json_ctx, (double) latency / (double) iters); > > +} > > + > > +static void > > +do_test (json_ctx_t *json_ctx, size_t align, int c1, int c2, size_t le= n) > > +{ > > + align &=3D getpagesize () - 1; > > + if ((align + len) * sizeof (CHAR) > page_size) > > + return; > > + > > + json_element_object_begin (json_ctx); > > + json_attr_uint (json_ctx, "length", len); > > + json_attr_uint (json_ctx, "alignment", align); > > + json_attr_int (json_ctx, "char1", c1); > > + json_attr_int (json_ctx, "char2", c2); > > + json_array_begin (json_ctx, "timings"); > > + > > + FOR_EACH_IMPL (impl, 0) > > + { > > + do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c1, c2, le= n); > > + alloc_bufs (); > > + } > > + > > + json_array_end (json_ctx); > > + json_element_object_end (json_ctx); > > +} > > + > > +int > > +test_main (void) > > +{ > > + json_ctx_t json_ctx; > > + size_t i; > > + int c1, c2; > > + > > + test_init (); > > + > > + json_init (&json_ctx, 0, stdout); > > + > > + json_document_begin (&json_ctx); > > + json_attr_string (&json_ctx, "timing_type", TIMING_TYPE); > > + > > + json_attr_object_begin (&json_ctx, "functions"); > > + json_attr_object_begin (&json_ctx, TEST_NAME); > > + json_attr_string (&json_ctx, "bench-variant", "zerofill"); > > + > > + json_array_begin (&json_ctx, "ifuncs"); > > + FOR_EACH_IMPL (impl, 0) > > + json_element_string (&json_ctx, impl->name); > > + json_array_end (&json_ctx); > > + > > + json_array_begin (&json_ctx, "results"); > > + > > + for (c1 =3D 0; c1 < 2; c1++) > > + for (c2 =3D 0; c2 < 2; c2++) > > + for (i =3D START_SIZE; i <=3D MIN_PAGE_SIZE; i <<=3D 1) > > + { Creating 4 patterns here. Thanks. Naohiro > > + do_test (&json_ctx, 0, c1, c2, i); > > + do_test (&json_ctx, 3, c1, c2, i); > > + } > > + > > + json_array_end (&json_ctx); > > + json_attr_object_end (&json_ctx); > > + json_attr_object_end (&json_ctx); > > + json_document_end (&json_ctx); > > + > > + return ret; > > +} > > + > > +#include > > + > > +#define libc_hidden_builtin_def(X) > > +#define libc_hidden_def(X) > > +#define libc_hidden_weak(X) > > +#define weak_alias(X,Y) > > +#undef MEMSET > > +#define MEMSET generic_memset > > +#include > > -- > > 2.17.1 > >