[Seaside] Seaside image health check
leves at elte.hu
Thu Dec 22 16:46:02 UTC 2011
On Thu, 22 Dec 2011, Paul DeBruicker wrote:
> I have a Pharo 1.3-13315/Seaside 188.8.131.52 headless image on 64bit linux that
> sometimes stops responding to HTTP requests and acts like its in an infinite
> loop. If I connect to that image with the RFB after a couple minutes I can
> enter my password and it drops out of the infinite loop and resumes answering
> HTTP requests as if nothing was wrong. The hang happens irregularly and I
> haven't yet been able to get access to a debugger when it is hanging.
> CPUWatcher doesn't catch it either.
> I'm thinking to use the Scheduler package + ZnClient to send a request from
> that image to itself requesting a page, and if it times out, to write the
> ProcessBrowser + CPU usage data to a log file.
> Is there an established/better/other way to attempt to diagnose these
> intermittent hangs?
If you're using CogVM, then you can force printing the content of all
smalltalk stacks to stdout by sending a USR1 signal to the process with
the following command:
kill -USR1 <pid>
The currently active process will be printed first.
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