🚀 go-pugleaf

On 06 May 2000 15:49:25 +0200, Lieven Marchand <mal@bewoner.dma.be> wrote:

>From ~linux/Documentation/filesystems/proc.txt:
>
>[snip]
>However, there is still a per process limit of open files, which
>unfortunately >can't be changed that easily. It is set to 1024 by
>default. To change this you >have to  edit  the files limits.h and fs.h
>in the kernel source tree. Finally, >change the definition of NR_OPEN
>and recompile the kernel.
>
>Dus je eerste operatie is wel nuttig maar ulimit gaat weinig uithalen.

Nochtans :

# uname -rs
Linux 2.2.14-5.0smp
# cat fhtest.c

#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>

extern int errno;

int main (void) {
	int i;

	for (i = 0; i < 20480; i++)
		if (open("fhtest.c", O_RDONLY) < 0) {
			printf ("error at attempt %d: %s\n", i, strerror(errno));
			exit (0);
		}

	return 0;
}

# echo 16384 > /proc/sys/fs/file-max
# ulimit -n 1024
# ./fhtest
error at attempt 1021: Too many open files
# ulimit -n 16384
error at attempt 16259: Too many open files in system

Dat maakt dus wel degelijk een verschil. :) Ook, uit fs.h:

/*
 * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
 * the file limit at runtime and only root can increase the per-process
 * nr_file rlimit, so it's safe to set up a ridiculously high absolute
 * upper limit on files-per-process.
 *
 * Some programs (notably those using select()) may have to be 
 * recompiled to take full advantage of the new limits..  
 */

/* Fixed constants first: */
#undef NR_OPEN
#define NR_OPEN (1024*1024)     /* Absolute upper limit on fd num */
#define INR_OPEN 1024           /* Initial setting for nfile rlimits */

Kan het zijn dat die docs niet 100% up-to-date zijn?

carl.
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