Re: socket problem

[Arnaldo Carvalho de Melo <acme@conectiva.com.br>]

Em Fri, Aug 24, 2001 at 11:59:21AM +0000, Pete Marvin King escreveu:
> 
>     Is it possible to increase the maximum sockets that can be opened
> simultaneously?
> I'd like it to reach 1024, is it possible?
> 
>     I'm currently doing a stress test on postgres. we created a dummy
> client that would
> connect to it 1024 times. But is just stops at 324,
> postgres reports : " postmaster: StreamConnection: accept: Too many open
> files in system".
> 
>     I don't think the problem is not with the file descriptors. Is it
> the max num of sockets?
> or maybe the maximum number of files that can be opened?
> 
>     Any help would be greatly appreciated.

increase te max number of fds in /proc/sys/fs/file-max and in ulimit -n

[root@brinquedo /root]# cat ~acme/max_sockets.c
#include <sys/types.h>
#include <sys/socket.h>

int main(void)
{
        int nr_sockets = 0;

        while(socket(PF_INET, SOCK_STREAM, 0) > 0)
                ++nr_sockets;
        printf("nr_sockets=%d\n", nr_sockets);
        return 0;
}
[root@brinquedo /root]# ulimit -n
4096
[root@brinquedo /root]# ./max_sockets
nr_sockets=4093
[root@brinquedo /root]# ulimit -n 8192
[root@brinquedo /root]# ./max_sockets
nr_sockets=7600
[root@brinquedo /root]# ulimit -n 16384
[root@brinquedo /root]# ./max_sockets
nr_sockets=7601
[root@brinquedo /root]# cat /proc/sys/fs/file-max
8192
[root@brinquedo /root]# echo 20000 > /proc/sys/fs/file-max
[root@brinquedo /root]# ./max_sockets
nr_sockets=16381

- Arnaldo