#include <sys/resource.h>
#include <asm/poll.h>
#include <errno.h>
main (void)
{
struct pollfd pfds [10000];
int pollnum=257, retval;
struct rlimit rlim;
getrlimit (RLIMIT_NOFILE, &rlim);
printf ("Cur %d Max %d\n", rlim.rlim_cur,
rlim.rlim_max);
rlim.rlim_cur = rlim.rlim_max = 32768;
if (setrlimit (RLIMIT_NOFILE, &rlim) != 0)
printf ("Error in setting max FDs %s\n",
strerror(errno));
getrlimit (RLIMIT_NOFILE, &rlim);
printf ("Cur %d Max %d\n", rlim.rlim_cur,
rlim.rlim_max);
memset (pfds, 0, sizeof(struct pollfd)*10000);
for (;;)
{
retval = poll (pfds, pollnum, 10*1000);
if (retval > 0)
break;
if (retval < 0)
{
printf ("Poll error %s\n", strerror(errno));
return (-1);
}
}
}
with the above code (running as root) i was able to
get the ff output:
Cur 1024 Max 1024
Cur 32768 Max 32768
Poll error Invalid argument
--- David Schwartz <davids@webmaster.com> wrote:
>
> Your code fragment is not large enough. For one
> thing, it doesn't show
> where 'pfds' comes from. Also, you need to run it as
> root, since only root
> can raise its resource limits.
>
> Send me an entire code fragment that is large
> enough to compile.
>
> DS
>
> > -----Original Message-----
> > From: Sherwin Notario
> [mailto:sherwin_notario@yahoo.com]
> > Sent: Monday, November 29, 1999 5:21 PM
> > To: David Schwartz
> > Subject: RE: Poll Error
> >
> >
> > iam using kernel 2.2.5-15
> >
> > yes, i modified file-max and inode-max of
> /proc/sys/fs
> >
> > here is the code fragment:
> > ...
> > ...
> > /* set to 32 K here */
> > rlim.rlim_cur = rlim.rlim_max = 32768;
> > if (setrlimit (RLIMIT_NOFILE, &rlim) != 0)
> > printf ("Error in setting max FDs %s\n",
> > strerror(errno));
> > ...
> > ...
> > for (;;)
> > {
> > /* for debugging, i modify pollnum */
> > lRetVal = poll (pfds, pollnum, 10*1000);
> > if (lRetVal > 0)
> > break;
> > if (lRetVal < -1)
> > {
> > printf ("Poll error %s\n",
> strerror(errno));
> > return (-1);
> > }
> > }
> > ...
> >
> > when i run this (with pollnum > 256, the result is
> > always:
> > Poll error Invalid argument
> >
> > sherwin
> >
> >
> > --- David Schwartz <davids@webmaster.com> wrote:
> > > > i tried setting file-max to 32768 and
> inode-max
> > > to
> > > > 65536.
> > >
> > > What kernel version did you use? And you are
> doing
> > > this through the
> > > /proc/sys/fs interface?
> > >
> > > > i've also set NR_OPEN and NR_FILE to 32K (in
> > > > limits.h and fs.h) then recompiled the kernel.
> > >
> > > Big mistake. Don't do that.
> > >
> > > > in my program, i was able to set the maximum
> > > number
> > > > of open files to 32K (though setrlimit()). but
> > > when i
> > > > call poll with nfds > 256, i still get error.
> > >
> > > What error do you get? Can you email me your
> test
> > > program?
> > >
> > > DS
> > >
> > > > --- David Schwartz <davids@webmaster.com>
> wrote:
> > > > >
> > > > > There is no such limit in the poll
> function.
> > > You
> > > > > won't run into problems
> > > > > with it until you hit about 16,000 fds. You
> will
> > > > > not, of course, be able to
> > > > > _open_ more than 256 files unless you adjust
> > > your
> > > > > per-process resource
> > > > > limits. And you may not be able to create
> more
> > > than
> > > > > about 10,000 unless you
> > > > > adjust your system-wide inode and file
> limits.
> > > > >
> > > > > DS
> > > > >
> > > > > > hi,
> > > > > >
> > > > > > iam writing a program that uses poll
> function.
> > > > > >
> > > > > > int poll(struct pollfd *ufds, unsigned int
> > > nfds,
> > > > > int
> > > > > > timeout)
> > > > > >
> > > > > > i will use it to check 10000 FDs. but it
> > > only
> > > > > allows
> > > > > > me to check up to 256 FDs.
> > > > > >
> > > > > > is there a way for me to increase nfds ?
> > > > > >
> > > > > > sherwin
> > > > > >
> > >
> __________________________________________________
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