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October 2016

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2 discussions

Thread Safety (continued)
by John Paulson 29 Oct '16

29 Oct '16

Hi Enea and Roberto, Thank you very much for all of the work you have done on threading with PPL. I have a couple of questions about the current status of the thread safety. A project I am currently working on needs to have multiple threads working simultaneously on distinct PPL objects. Is that possible with the new thread safe version? I made an implementation of my current project where I fork processes instead of using multiple threads. However, if I fork and have two processes manipulating distinct PPL objects, I do not get a speedup by a factor of two like I would expect. Is there anyway to get that type of speedup? Best, John C. Paulson

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[GIT] ppl/ppl(devel): Improved thread-safety for the mechanism for abandoning expensive computations .
by Enea Zaffanella 06 Oct '16

06 Oct '16

Module: ppl/ppl Branch: devel Commit: ff54802bc0227620b61c7f840a4b51705c2b3dd0 URL: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commit;h=ff54802bc022… Author: Enea Zaffanella <zaffanella(a)cs.unipr.it> Date: Thu Oct 6 15:02:00 2016 +0200 Improved thread-safety for the mechanism for abandoning expensive computations. Added helper make_interruptible() to allow for the creation of threads executing PPL-related computations that can be interrupted. Note: it is up to the library user to do what is needed in order to propagate the exceptions from the (interrupted) worker thread to the (interrupting) master thread. See tests/Polyhedron/threadsafe2.cc for an example. Note: the mechanism is only available in the C++ interface. --- interfaces/C/ppl_c_implementation_common.cc | 19 ++++- interfaces/Java/jni/ppl_java_common.cc | 6 ++ interfaces/Java/jni/ppl_java_globals.cc | 27 ++++++ src/Makefile.am | 1 + src/globals.cc | 5 +- src/globals_defs.hh | 16 ++++- src/make_threadable.cc | 79 ++++++++++++++++++ src/make_threadable.hh | 81 ++++++++++++++++-- tests/Polyhedron/Makefile.am | 4 +- tests/Polyhedron/threadsafe2.cc | 118 +++++++++++++++++++++++++++ 10 files changed, 342 insertions(+), 14 deletions(-) Diff: http://www.cs.unipr.it/git/gitweb.cgi?p=ppl/ppl.git;a=commitdiff;h=ff54802b…

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