Hello Rajeev,
I'd recommend also CallstackOnException=2 in [Parameters] section of
virtuoso.ini, in addition to PlDebug
Best Regards,
Ivan Mikhailov
OpenLink Software.
----- Original Message -----
From: "Tim Haynes" <tim.hay...@openlinksw.co.uk>
To: "Rajeev J Sebastian" <rajeev.sebast...@gmail.com>
Cc: "virtuoso-users" <virtuoso-users@lists.sourceforge.net>
Sent: Monday, April 21, 2008 9:44 PM
Subject: Re: [Virtuoso-users] Random hanging
Rajeev J Sebastian wrote:
Hi,
I am experiencing random hangs of the server when using the SPARQL
endpoint. Looking in the error log also echoed on console, there is no
information whatsoever. doing a "kill <pid>" shows "Server received
signal 2" or some such. However, the server doesnt exit.
I have to issue a SIGTERM for it to actually exit. restarting the
server of course replays the transaction logs, and the data seems
fine. This happens every once in a while, and I have to restart
several times. However, after 3-4 restarts, suddenly everything
becomes fine and it works until the next time this happens a few days
later.
So, a couple of questions:
1) has anyone seen this before ?
2) if so, any reason why it occurs and any fixes/workarounds ?
3) any way to increase the verbosity of the error log and atleast show
what its doing at a particular time ?
I can make a couple of suggestions about #3.
a) Enable lots of debug tracing (will require PLDebug=1 in the ini-file):
http://docs.openlinksw.com/virtuoso/fn_trace_on.html
b) As & when it appears hung, try accessing the isql port:
isql> status();
c) see if you can tie it down to particular SPARQL queries somehow?
HTH,
~Tim
--
Tim Haynes
Product Development Consultant
OpenLink Software
<http://www.openlinksw.com/>
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