Extremely poor performance crunching random numbers under PIV-FC5
BankHacker
bankhacker at gmail.com
Fri May 19 00:11:34 UTC 2006
> It seems that maybe we can just say the whole problem comes down to that
> rand() from dynamically linked libc.so.6 is slower to execute than what
> is supposed to be the same code statically linked.
Yes, glibc is under suspicion. There are several indications ...
> If you can't get random_r() to work (see eg
> http://refspecs.freestandards.org/LSB_1.2.0/gLSB/baselib-random-r-3.html
I am trying to implement random_r function. This is my try:
### prueba.c #####################################################
#include <stdio.h>
#include <stdlib.h>
int32_t r;
struct random_data rand_data;
int main(int argc, char ** argv) {
random_r(&rand_data, &r);
printf("%d\n", (int)r);
return (0);
}
### prueba.c (the end) ###########################################
But I obtain this result:
# gcc prueba.c -o prueba -Wall -pedantic
# ./prueba
Segmentation fault
I am doing something wrong. Any hint?
Thanks!
More information about the fedora-list
mailing list