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rmcd limitation?
From: |
Brian Credeur |
Subject: |
rmcd limitation? |
Date: |
Thu, 25 Jul 2002 12:33:08 -0500 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.4.1) Gecko/20020314 Netscape6/6.2.2 |
Hello,
We are attempting to issue a relatively large number of rsh connections
from a single host to multilple others. Specifically, we are looking to
start a cluster processing job.
After several tests, we have confirmed that there is a limitation of
some sort at approximately 255 concurrent connections. All of the
rejected connects have the following error message:
rcmd: socket: All ports in use
The error condition presents itself even when running 100 connection
attempts from 3 different shells on the same system with any combination
of user accounts, so it appears to be a system limitation.
Other people have posted reports that this issue is with RedHat 7.2
systems, as well. Some have described it as a limitation within glibc,
and I wanted to verify if this was a known issue or
not. If so, is there a viable/pending resolution?
Information on the host initiating the rsh connections:
$ cat /etc/issue
Red Hat Linux release 7.1 (Seawolf)
Kernel 2.4.9-6-smp.1G on a 2-processor i686
$ uname -a
Linux bilbo-ibm 2.4.9-6-smp.1G #1 SMP Mon Nov 5 23:05:45 CST 2001 i686
unknown
$ ldd /usr/bin/rsh
libcrypt.so.1 => /lib/libcrypt.so.1 (0x4001f000)
libutil.so.1 => /lib/libutil.so.1 (0x4004c000)
libc.so.6 => /lib/libc.so.6 (0x4004f000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
$ cd lib ; ls -l *libc*
-rwxr-xr-x 1 root root 5724399 Oct 3 2001 libc-2.2.4.so
lrwxrwxrwx 1 root root 17 Nov 1 2001 libcom_err.so.2
-> libcom_err.so.2.0
-rwxr-xr-x 1 root root 8484 Sep 17 2001 libcom_err.so.2.0
-rwxr-xr-x 1 root root 87059 Oct 3 2001 libcrypt-2.2.4.so
lrwxrwxrwx 1 root root 17 Nov 5 2001 libcrypt.so.1 ->
libcrypt-2.2.4.so
lrwxrwxrwx 1 root root 13 Nov 5 2001 libc.so.6 ->
libc-2.2.4.so
Thanks,
Brian
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