Re^2: Crash with Parallel::ForkManager on Windows

Hello kcott,

where are you running your code?

Unfortunately on Perl (v5.14.2) built for MSWin32-x86-multi-thread on win7 and Parallel::ForkManager 1.19 I get more than 50% of crashes, using your code.

Testing more times mine, as posted above, I get ~25% of crashes.. (not saying mine is better: better is no crash at all ;=)

Unfortunately windows is a shaggy beast and I'm not able to debug this behaviour further: what I can add is that during installation I got some warning about disappeared PIDs even if the overall testing process ended ok:

t/00-report-prereqs.t ..... ok
t/01-utf8-all.t ........... skipped: This is a bug in perl itself on W
+indows
t/02-callback.t ........... # This test can take 10-20 seconds, please
+ wait. Started at Thu Sep 21 11:23:08 2017
t/02-callback.t ........... ok
t/03-callback-data.t ...... # This test can take 2-6 seconds, please w
+ait. Started at Thu Sep 21 11:23:25 2017
t/03-callback-data.t ...... ok
t/basic-methods.t ......... ok
t/changing-pids.t ......... ok
t/start_child.t ........... ok
t/waitpid-conflict.t ...... # code outside of P::FM stole -1152
child process '-1152' disappeared. A call to `waitpid` outside of Para
+llel::ForkManager might have reaped it.
t/waitpid-conflict.t ...... ok
t/waitpid-waitonechild.t .. # code outside of P::FM stole -5456
# found warning: child process '-5456' disappeared. A call to `waitpid
+` outside of Parallel::ForkManager might have reap
ed it.
t/waitpid-waitonechild.t .. 1/? # expected to find warning: (?^:child 
+process '\d+' disappeared. A call to `waitpid` out
side of Parallel::ForkManager might have reaped it\.)
t/waitpid-waitonechild.t .. ok
t/waitpid_blocking.t ...... ok
All tests successful.
[download]

PS modified the title a bit for better later search

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Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

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Re^3: Crash with Parallel::ForkManager on Windows by kcott (Archbishop) on Sep 21, 2017 at 10:03 UTC
G'day Discipulus, Thanks for the follow-up. While it's clear the OP was using Windows, I wasn't aware that this was a Windows-specific problem: I don't see anything like "This worked on XYZ, but not on Windows". I'm using: `Perl 5.26.0 (built for darwin-thread-multi-2level) Parallel::ForkManager 1.19 LWP::Simple 6.26` [download] I had to install Parallel::ForkManager and the `cpan` output is still on one of my screens. Here's my equivalent lines to those you posted: t/00-report-prereqs.t ..... ok t/01-utf8-all.t ........... skipped: Need utf8::all for this test cras +hing on Windows # This test can take 10-20 seconds, please wait. Started at Thu Sep 21 + 17:07:29 2017 t/02-callback.t ........... ok # This test can take 2-6 seconds, please wait. Started at Thu Sep 21 1 +7:07:45 2017 t/03-callback-data.t ...... ok t/basic-methods.t ......... ok t/changing-pids.t ......... ok t/start_child.t ........... ok # code outside of P::FM stole 2369 child process '2369' disappeared. A call to `waitpid` outside of Paral +lel::ForkManager might have reaped it. t/waitpid-conflict.t ...... ok # code outside of P::FM stole 2371 t/waitpid-waitonechild.t .. ok t/waitpid_blocking.t ...... ok All tests successful. [download] You appear to have had problems with `t/waitpid-waitonechild.t` that I didn't have; everything else looks fairly similar. To be honest, I started the installation, went and made a coffee, came back and saw: `YANICK/Parallel-ForkManager-1.19.tar.gz /usr/bin/make install -- OK cpan[2]>` [download] I rarely review the (often many screenfuls of) output unless the installation failed. — Ken	[reply] [d/l] [select]
Re^4: Crash with Parallel::ForkManager on Windows by holli (Abbot) on Sep 21, 2017 at 12:46 UTC
I am getting the bogus tests too, yet I can run this and get no crashes at all. Win 8.1 64-Bit, ActivePerl 5.24 built for MSWin32-x64-multi-thread holli You can lead your users to water, but alas, you cannot drown them.	[reply] [d/l]
Re^5: Crash with Parallel::ForkManager on Windows by kcott (Archbishop) on Sep 22, 2017 at 06:15 UTC
G'day holli, ++ Thanks for taking the time to test that. I've referenced the result in "Re^3: Crash with ForkManager on Windows". — Ken	[reply]


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