Hello,
I'm having real trouble right now with getting socket
communication to work in root (Version 3.03/07 14 August 2002).
I'm opening tscoket in a loop
TSocket *s = new TSocket("localhost", 9090);
then transfer histograms across the tsocket,
s->Recv(mess_in);
if (mess_in){
if (mess_in->What() == kMESS_OBJECT)
HTrksPSec = (TH1F *)mess_in->ReadObject(mess_in->GetClass());
else {
cout << "***Unexpected message***" << endl;
if (mess_in->What() == kMESS_STRING)
{ char errstr[64]; mess_in->ReadString(errstr, 64);
printf("%s\n", errstr); }
}
}
I then close the tsocket before continuing in another loop iteration.
s->Close()
ps. I tried s->Close("force"); which didn't work either.
The problem is that root doesn't seem to close the socket properly
which is causing serious problems with our online monitoring (see mail
below) & is starting to hurt our trigger comissioning. Has anyone ever
seen this before, is it a known problem, is there a solution ?
Kyle.
---------- Forwarded message ----------
Date: Fri, 07 Feb 2003 17:12:19 -0600 (CST)
From: Stu Fuess <fuess@fnal.gov>
To: Kyle Stevenson <stevenkj@fnal.gov>
Subject: root problem
We looked at file descriptor usage:
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1016
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1018
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1020
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1024
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1024
[root@d0ol43 ~]# ls -1 /proc/23124/fd | wc -l
1024
It hits the kernel limit of 1024 files per process max.
where 23124 was the pid of
../../bin/Linux2.4-KCC_4_0/l1CTT_examine_x -rcp ../rcp/runol_vsvx_framework.rcp
see from netstat -a that CLOSE_WAIT sockets never go away:
tcp 1 0 localhost.localdom:9090 localhost.localdo:39646 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:38110 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:40157 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:39133 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:39389 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:38365 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:41180 CLOSE_WAIT
tcp 1 0 localhost.localdom:9090 localhost.localdo:38620 CLOSE_WAIT
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