Hi Steven, could it be that on the server side the socket is not properly closed? I use TSocket to a httpd daemon and close it via standard TSocket::Close() and there are no problems. Cheers, Fons. On Thu, 2003-02-13 at 21:49, stevenkj wrote: > 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 > > > -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
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