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calloc speed difference
- From: Lee <ler762 at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Fri, 12 Jan 2018 02:19:40 -0500
- Subject: calloc speed difference
- Authentication-results: sourceware.org; auth=none
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
1:12 vs 0:11
$cat calloc-test.c
#include <stdio.h>
#include <stdlib.h>
#define ALLOCATION_SIZE (100 * 1024 * 1024)
int main (int argc, char *argv[]) {
for (int i = 0; i < 10000; i++) {
void *temp = calloc(ALLOCATION_SIZE, 1);
if ( temp == NULL ) {
printf("drat! calloc returned NULL\n");
return 1;
}
free(temp);
}
return 0;
}
$gcc calloc-test.c
$time ./a
real 1m12.459s
user 0m0.640s
sys 1m11.750s
$i686-w64-mingw32-gcc calloc-test.c
$time ./a
real 0m11.119s
user 0m0.000s
sys 0m0.000s
$gcc calloc-test.c
$time ./a
real 1m12.323s
user 0m0.656s
sys 1m11.640s
$i686-w64-mingw32-gcc calloc-test.c
$time ./a
real 0m11.080s
user 0m0.000s
sys 0m0.000s
$
$ gcc --version
gcc (GCC) 6.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ i686-w64-mingw32-gcc --version
i686-w64-mingw32-gcc (GCC) 6.4.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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