From: Robert Klemme <bob.news@...>
Date: 2003-12-08T23:02:03+09:00
Subject: Re: Ruby blocks... forever


"Nathaniel Talbott" <nathaniel@talbott.ws> schrieb im Newsbeitrag
news:FCD7172F-2984-11D8-9E0C-000A95CD7A8E@talbott.ws...
> Ruby 1.8.1preview2, running on Debian Linux. Server is WEBrick based,
> and the main extensions used are Ruby/ODBC and Ruby/Postgres.
>
> I just tried to put the server in to production (approximately an
> exponential increase in users, although it was done at a lower-traffic
> time of day) and Ruby decided to hang on me. Here's the appropriate
> line from top:
>
>      PID USER      RSS WCHAN        FLAGS LC STAT %CPU %MEM   TIME
> COMMAND
>    16419 se        15M rt_sigsus       40  0 S     0.0  1.7  24:52
server
>
> Although I'm not sure, I think the WCHAN indicates that the process is
> blocked waiting for something to happen. What, I don't know.
>
> I suspect Ruby/ODBC as the culprit, but here are my questions:
>
>    1. What could cause such a hang? Where should I even begin looking?

Database transaction deadlocks

>    2. The process is still sitting there, doing nothing. Is there any
> more information I can get out of it before I kill it?

Hm, dunno.

    robert