On 29.03.2016 23:34, Alan W. Irwin wrote:
On 2016-03-29 22:46+0200 Nils Gladitz wrote:
On 29.03.2016 21:39, Alan W. Irwin wrote:
One of the PLplot developers, Arjen Markus, has just reported to me
that ctest -j4 for PLplot hangs on his MinGW-w64/MSYS2 platform while
ctest works fine. This issue occurred for the
mingw64/mingw-w64-x86_64-cmake 3.4.1-1 package version of ctest.exe,
and the PLplot build was done with the "MSYS Makefiles" generator. In
contrast to the MinGW-w64/MSYS2 platform case, ctest -j4 works fine
for the Linux case.
Has anyone else here had similar difficulties OR success with the
parallel ctest option on the MinGW-w64/MSYS2 platform?
Afair there are sporadic issues with the cygwin runtime (on which
msys/msys2 is based) in the process handling code of kwsys (used by
cmake).
The code is used by e.g. execute_process() and also ctest for test
execution.
I think the issue is due to how pipes are implemented by the runtime.
From what I remember rsync also suffers from this.
Also having Kaspersky installed (even when paused) seems to make
these hangs more likely.
Thanks, Nils, for that information. Could this issue be related to
the Cygwin unreliability mentioned in
<http://cygwin.com/cygwin-ug-net/highlights.html> where they say "In
summary, current Windows implementations make it impossible to
implement a perfectly reliable fork, and occasional fork failures are
inevitable."?
Afair the issue was a wait or select on the pipes used to connect to the
spawned process rather than fork but I haven't debugged into it myself.
I think there was a cygwin mailing list post on this too but I don't
seem to be able to find it.
Nils
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