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Re: [ptp-user] PTP synchronized project remote build appears to hang
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Hi Christoph,
I've seen builds hang on local projects, which makes me think there is some kind of deadlock/timing issue in the CDT builder. As your ps shows, the ssh command that ran the build has completed successfully, so the problem is somewhere else inside Eclipse. Debugging is tricky. You could either try running Eclipse under it's own debugger (a lot of setting up to get it going), then suspend all the threads at this point to see what is going on, or use something like Java VisualVM to get a thread dump.
Regards,
Greg
On Jan 20, 2012, at 6:43 AM, Christoph Pospiech wrote:
> Hi,
>
> I just saw a PTP synchronized project remote build that appears to hang. If I
> login on the remote host, the executable has been generated and stored in the
> right place. The processes owned by me that are still running are the
> following.
> cp 8097 8095 0 05:36 ? 00:00:00 sshd: cp@pts/50
> cp 8098 8097 0 05:36 pts/50 00:00:00 /bin/sh
> cp 8136 8097 0 05:36 ? 00:00:00 /usr/lib64/ssh/sftp-server
> cp 8165 8097 0 05:36 ? 00:00:00 /usr/lib64/ssh/sftp-server
> cp 8194 8097 0 05:36 ? 00:00:00 /usr/lib64/ssh/sftp-server
> [...]
> cp 14274 30667 99 06:04 pts/47 00:00:00 ps -ef
> cp 14275 30667 0 06:04 pts/47 00:00:00 grep cp
> cp 14276 30667 0 06:04 pts/47 00:00:00 less
> [...]
> root 30656 6309 0 04:41 ? 00:00:00 sshd: cp [priv]
> cp 30666 30656 0 04:41 ? 00:00:00 sshd: cp@pts/47
> cp 30667 30666 0 04:41 pts/47 00:00:00 -bash
>
> The processes that belong to pts/47 apparently belong to my analysis on the
> remote host that was necessary to write this post. But there is not much else
> left. I would expect another synchronize step to take place (some git process
> perhaps...).
>
> But on the local side, eclipse still says "Build Project: (5%)". If I send it
> into background, go to the progress window and click on the little red square,
> it says "Cancel requested" and stays there (apparently) forever.
>
> I exited eclipse, switched to the shell (pts/47) on the remote host, and did a
> "make clean; make" - no problem. This took a while, same with and without
> eclipse, as the optimizer had to work extensively on some subroutines, in
> total 15--30 min.
>
> Finally, I restarted eclipse and did a "sync active now". This went smoothly
> and replicated the executable back to my local host.
>
> I guess I just worked round the problem, but - what is the problem ? Anyone
> any idea why the hang occurred ?
> --
>
> Mit freundlichen Grüßen / Kind regards
>
> Dr. Christoph Pospiech
> High Performance & Parallel Computing
> Phone: +49-351 86269826
> Mobile: +49-171-765 5871
> E-Mail: christoph.pospiech@xxxxxxxxxx
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