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benchtests: Clean up the alloc_bufs

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Drop realloc_bufs in favour of making alloc_bufs transparently
reallocate the buffers if it had allocated before.  Also consolidate
computation of buffer lengths so that they don't get repeated on every
reallocation.

	* benchtests/bench-string.h (buf1_size, buf2_size): New
	variables.
	(init_sizes): New function.
	(test_init): Use it.
	(alloc_buf, exit_error): New functions.
	(alloc_bufs): Use ALLOC_BUF.
	(realloc_bufs): Remove.
	* benchtests/bench-memcmp.c (do_test): Adjust.
	* benchtests/bench-memset-large.c (do_test): Likewise.
	* benchtests/bench-memset-walk.c (do_test): Likewise.
	* benchtests/bench-memset.c (do_test): Likewise.
	* benchtests/bench-strncmp.c (do_test): Likewise.
This commit is contained in:
Siddhesh Poyarekar 2018-08-08 00:44:56 +05:30
parent 92a4cba760
commit 014efdd7ea
7 changed files with 57 additions and 33 deletions
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15
ChangeLog
View file

@ -1,3 +1,18 @@
2018-08-07 Siddhesh Poyarekar <siddhesh@sourceware.org>
* benchtests/bench-string.h (buf1_size, buf2_size): New
variables.
(init_sizes): New function.
(test_init): Use it.
(alloc_buf, exit_error): New functions.
(alloc_bufs): Use ALLOC_BUF.
(realloc_bufs): Remove.
* benchtests/bench-memcmp.c (do_test): Adjust.
* benchtests/bench-memset-large.c (do_test): Likewise.
* benchtests/bench-memset-walk.c (do_test): Likewise.
* benchtests/bench-memset.c (do_test): Likewise.
* benchtests/bench-strncmp.c (do_test): Likewise.
2018-08-06 Andreas Schwab <schwab@suse.de>
* sysdeps/riscv/nptl/tls.h (DB_THREAD_SELF): Use REGISTER instead

2
benchtests/bench-memcmp.c
View file

@ -132,7 +132,7 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
s2[len - 1] -= exp_result;
do_one_test (json_ctx, impl, s1, s2, len, exp_result);
realloc_bufs ();
alloc_bufs ();
}
json_array_end (json_ctx);

2
benchtests/bench-memset-large.c
View file

@ -92,7 +92,7 @@ do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
FOR_EACH_IMPL (impl, 0)
{
do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
realloc_bufs ();
alloc_bufs ();
}
json_array_end (json_ctx);

2
benchtests/bench-memset-walk.c
View file

@ -88,7 +88,7 @@ do_test (json_ctx_t *json_ctx, int c, size_t len)
{
do_one_test (json_ctx, impl, (CHAR *) buf1,
(CHAR *) buf1 + MIN_PAGE_SIZE - len, c, len);
realloc_bufs ();
alloc_bufs ();
}
json_array_end (json_ctx);

2
benchtests/bench-memset.c
View file

@ -134,7 +134,7 @@ do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
FOR_EACH_IMPL (impl, 0)
{
do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
realloc_bufs ();
alloc_bufs ();
}
json_array_end (json_ctx);

63
benchtests/bench-string.h
View file

@ -76,10 +76,8 @@ extern impl_t __start_impls[], __stop_impls[];
# define INNER_LOOP_ITERS 64
unsigned char *buf1, *buf2;
int ret, do_srandom;
unsigned int seed;
size_t page_size;
# ifndef ITERATIONS
size_t iterations = 100000;
@ -182,47 +180,57 @@ static impl_t *impl_array;
# define BUF1PAGES 1
# endif
unsigned char *buf1, *buf2;
static size_t buf1_size, buf2_size, page_size;
static void
alloc_bufs (void)
init_sizes (void)
{
page_size = 2 * getpagesize ();
# ifdef MIN_PAGE_SIZE
if (page_size < MIN_PAGE_SIZE)
page_size = MIN_PAGE_SIZE;
# endif
buf1 = mmap (0, (BUF1PAGES + 1) * page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf1 == MAP_FAILED)
error (EXIT_FAILURE, errno, "mmap failed for buf1");
if (mprotect (buf1 + BUF1PAGES * page_size, page_size, PROT_NONE))
error (EXIT_FAILURE, errno, "mprotect failed for buf1");
buf2 = mmap (0, 2 * page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buf2 == MAP_FAILED)
error (EXIT_FAILURE, errno, "mmap failed for buf2");
if (mprotect (buf2 + page_size, page_size, PROT_NONE))
error (EXIT_FAILURE, errno, "mprotect failed for buf2");
buf1_size = BUF1PAGES * page_size;
buf2_size = page_size;
}
static void
__attribute__ ((unused))
realloc_bufs (void)
exit_error (const char *id, const char *func)
{
int ret = 0;
error (EXIT_FAILURE, errno, "%s: %s failed", id, func);
}
if (buf1)
ret = munmap (buf1, (BUF1PAGES + 1) * page_size);
/* Allocate a buffer of size SIZE with a guard page at the end. */
static void
alloc_buf (const char *id, size_t size, unsigned char **retbuf)
{
size_t alloc_size = size + page_size;
if (ret != 0)
error (EXIT_FAILURE, errno, "munmap failed for buf1");
if (*retbuf != NULL)
{
int ret = munmap (*retbuf, alloc_size);
if (ret != 0)
exit_error (id, "munmap");
}
if (buf2)
ret = munmap (buf2, 2 * page_size);
unsigned char *buf = mmap (0, alloc_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (ret != 0)
error (EXIT_FAILURE, errno, "munmap failed for buf2");
if (buf == MAP_FAILED)
exit_error (id, "mmap");
if (mprotect (buf + size, page_size, PROT_NONE))
exit_error (id, "mprotect");
alloc_bufs ();
*retbuf = buf;
}
static void
alloc_bufs (void)
{
alloc_buf ("buf1", buf1_size, &buf1);
alloc_buf ("buf2", buf2_size, &buf2);
}
static void
@ -234,6 +242,7 @@ test_init (void)
/ sizeof func_list[0]));
# endif
init_sizes ();
alloc_bufs ();
if (do_srandom)

4
benchtests/bench-strncmp.c
View file

@ -150,7 +150,7 @@ do_test_limit (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
FOR_EACH_IMPL (impl, 0)
{
realloc_bufs ();
alloc_bufs ();
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
@ -207,7 +207,7 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t
FOR_EACH_IMPL (impl, 0)
{
realloc_bufs ();
alloc_bufs ();
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);