[PATCH] benchtests: Add benches for zeroing memset
Noah Goldstein
goldstein.w.n@gmail.com
Wed Feb 23 19:19:55 GMT 2022
On Wed, Feb 23, 2022 at 1:04 PM Sunil Pandey via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> LGTM
> Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
>
> Thanks,
> Sunil
>
Think we should wait until we decide on actually adding `__memsetzero`
to benchmarks for it.
> On Wed, Feb 9, 2022 at 7:36 AM H.J. Lu via Libc-alpha
> <libc-alpha@sourceware.org> wrote:
> >
> > memset with zero as the value to set is by far the majority value (99%+
> > for Python3 and GCC). Add bench-memset-zero-large.c,
> > bench-memset-zero-walk.c and bench-memset-zero.c to measure memset
> > functions for zeroing.
> > ---
> > benchtests/Makefile | 3 +++
> > benchtests/bench-bzero-large.c | 29 ++++++++++++++++++++++++++-
> > benchtests/bench-bzero-walk.c | 30 +++++++++++++++++++++++++++-
> > benchtests/bench-bzero.c | 30 +++++++++++++++++++++++++++-
> > benchtests/bench-memset-zero-large.c | 20 +++++++++++++++++++
> > benchtests/bench-memset-zero-walk.c | 20 +++++++++++++++++++
> > benchtests/bench-memset-zero.c | 20 +++++++++++++++++++
> > 7 files changed, 149 insertions(+), 3 deletions(-)
> > create mode 100644 benchtests/bench-memset-zero-large.c
> > create mode 100644 benchtests/bench-memset-zero-walk.c
> > create mode 100644 benchtests/bench-memset-zero.c
> >
> > diff --git a/benchtests/Makefile b/benchtests/Makefile
> > index 6f718fac35..9b8df3b3f5 100644
> > --- a/benchtests/Makefile
> > +++ b/benchtests/Makefile
> > @@ -139,6 +139,9 @@ string-benchset := \
> > memset \
> > memset-large \
> > memset-walk \
> > + memset-zero \
> > + memset-zero-large \
> > + memset-zero-walk \
> > rawmemchr \
> > stpcpy \
> > stpcpy_chk \
> > diff --git a/benchtests/bench-bzero-large.c b/benchtests/bench-bzero-large.c
> > index f2e2e981b7..cfc7b81cdf 100644
> > --- a/benchtests/bench-bzero-large.c
> > +++ b/benchtests/bench-bzero-large.c
> > @@ -17,7 +17,11 @@
> > <https://www.gnu.org/licenses/>. */
> >
> > #define TEST_MAIN
> > -#define TEST_NAME "bzero"
> > +#ifdef DO_MEMSET
> > +# define TEST_NAME "memset"
> > +#else
> > +# define TEST_NAME "bzero"
> > +#endif
> > #define START_SIZE (128 * 1024)
> > #define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
> > #define TIMEOUT (20 * 60)
> > @@ -25,6 +29,14 @@
> >
> > #include "json-lib.h"
> >
> > +#ifdef DO_MEMSET
> > +void *generic_memset (void *, int, size_t);
> > +
> > +typedef void *(*proto_t) (void *, int, size_t);
> > +
> > +IMPL (memset, 1)
> > +IMPL (generic_memset, 0)
> > +#else
> > static void
> > memset_zero (void * s, size_t len)
> > {
> > @@ -35,6 +47,7 @@ typedef void (*proto_t) (void *, size_t);
> >
> > IMPL (bzero, 1)
> > IMPL (memset_zero, 0)
> > +#endif
> >
> > static void
> > do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
> > @@ -45,7 +58,11 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
> > TIMING_NOW (start);
> > for (i = 0; i < iters; ++i)
> > {
> > +#ifdef DO_MEMSET
> > + CALL (impl, s, 0, n);
> > +#else
> > CALL (impl, s, n);
> > +#endif
> > }
> > TIMING_NOW (stop);
> >
> > @@ -115,3 +132,13 @@ test_main (void)
> > }
> >
> > #include <support/test-driver.c>
> > +
> > +#ifdef DO_MEMSET
> > +# 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 <string/memset.c>
> > +#endif
> > diff --git a/benchtests/bench-bzero-walk.c b/benchtests/bench-bzero-walk.c
> > index b65d12a6a2..00226f80b8 100644
> > --- a/benchtests/bench-bzero-walk.c
> > +++ b/benchtests/bench-bzero-walk.c
> > @@ -17,7 +17,11 @@
> > <https://www.gnu.org/licenses/>. */
> >
> > #define TEST_MAIN
> > -#define TEST_NAME "bzero"
> > +#ifdef DO_MEMSET
> > +# define TEST_NAME "memset"
> > +#else
> > +# define TEST_NAME "bzero"
> > +#endif
> > #define START_SIZE 128
> > #define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
> > #define TIMEOUT (20 * 60)
> > @@ -25,6 +29,15 @@
> >
> > #include "json-lib.h"
> >
> > +#ifdef DO_MEMSET
> > +void *generic_memset (void *, int, size_t);
> > +
> > +typedef void *(*proto_t) (void *, int, size_t);
> > +
> > +IMPL (memset, 1)
> > +IMPL (generic_memset, 0)
> > +
> > +#else
> > static void
> > memset_zero (void * s, size_t len)
> > {
> > @@ -35,6 +48,7 @@ typedef void (*proto_t) (void *, size_t);
> >
> > IMPL (bzero, 1)
> > IMPL (memset_zero, 0)
> > +#endif
> >
> > static void
> > do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
> > @@ -45,7 +59,11 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
> >
> > TIMING_NOW (start);
> > for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
> > +#ifdef DO_MEMSET
> > + CALL (impl, s, 0, n);
> > +#else
> > CALL (impl, s, n);
> > +#endif
> > TIMING_NOW (stop);
> >
> > TIMING_DIFF (cur, start, stop);
> > @@ -116,3 +134,13 @@ test_main (void)
> > }
> >
> > #include <support/test-driver.c>
> > +
> > +#ifdef DO_MEMSET
> > +# 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 <string/memset.c>
> > +#endif
> > diff --git a/benchtests/bench-bzero.c b/benchtests/bench-bzero.c
> > index 93ec521725..500b7eba96 100644
> > --- a/benchtests/bench-bzero.c
> > +++ b/benchtests/bench-bzero.c
> > @@ -17,12 +17,25 @@
> > <https://www.gnu.org/licenses/>. */
> >
> > #define TEST_MAIN
> > -#define TEST_NAME "bzero"
> > +#ifdef DO_MEMSET
> > +# define TEST_NAME "memset"
> > +#else
> > +# define TEST_NAME "bzero"
> > +#endif
> > #define MIN_PAGE_SIZE 131072
> > #include "bench-string.h"
> >
> > #include "json-lib.h"
> >
> > +#ifdef DO_MEMSET
> > +void *generic_memset (void *, int, size_t);
> > +
> > +typedef void *(*proto_t) (void *, int, size_t);
> > +
> > +IMPL (memset, 1)
> > +IMPL (generic_memset, 0)
> > +
> > +#else
> > static void
> > memset_zero (void * s, size_t len)
> > {
> > @@ -33,6 +46,7 @@ typedef void (*proto_t) (void *, size_t);
> >
> > IMPL (bzero, 1)
> > IMPL (memset_zero, 0)
> > +#endif
> >
> > static void
> > do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
> > @@ -43,7 +57,11 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
> > TIMING_NOW (start);
> > for (i = 0; i < iters; ++i)
> > {
> > +#ifdef DO_MEMSET
> > + CALL (impl, s, 0, n);
> > +#else
> > CALL (impl, s, n);
> > +#endif
> > }
> > TIMING_NOW (stop);
> >
> > @@ -132,3 +150,13 @@ test_main (void)
> > }
> >
> > #include <support/test-driver.c>
> > +
> > +#ifdef DO_MEMSET
> > +# 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 <string/memset.c>
> > +#endif
> > diff --git a/benchtests/bench-memset-zero-large.c b/benchtests/bench-memset-zero-large.c
> > new file mode 100644
> > index 0000000000..bc938cdfff
> > --- /dev/null
> > +++ b/benchtests/bench-memset-zero-large.c
> > @@ -0,0 +1,20 @@
> > +/* Measure memset functions for zeroing with large data sizes.
> > + Copyright (C) 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 DO_MEMSET 1
> > +#include "bench-bzero-large.c"
> > diff --git a/benchtests/bench-memset-zero-walk.c b/benchtests/bench-memset-zero-walk.c
> > new file mode 100644
> > index 0000000000..dce4b43e06
> > --- /dev/null
> > +++ b/benchtests/bench-memset-zero-walk.c
> > @@ -0,0 +1,20 @@
> > +/* Measure memset functions for zeroing throughput with large data sizes.
> > + Copyright (C) 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 DO_MEMSET 1
> > +#include "bench-bzero-walk.c"
> > diff --git a/benchtests/bench-memset-zero.c b/benchtests/bench-memset-zero.c
> > new file mode 100644
> > index 0000000000..535005f0e6
> > --- /dev/null
> > +++ b/benchtests/bench-memset-zero.c
> > @@ -0,0 +1,20 @@
> > +/* Measure memset functions for zeroing.
> > + Copyright (C) 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 DO_MEMSET 1
> > +#include "bench-bzero.c"
> > --
> > 2.34.1
> >
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