Hi, etj

There is awesomeness with PDL 2.076 in better utilization of the L1/L2/L3 cache. That is something to be proud of and a moment of celebration. Unfortunately, 2.076 introduces an anomaly. IMHO try storing the $$.$tid somewhere. For PDL to be thread-safety friendly, it is important for cleanup to occur by the originating thread which instantiated the object.

I will update the MCE demonstrations with a user_begin block to work around the issue. This I can do safely, because the piddles are instantiated by the main thread; i.e. $$.tid == $$.0

Update: Looking at the code, MCE workers also form piddles for the Strassen demonstrations. So I cannot do this unless I save/check the thread ID.

user_begin => sub {
    # PDL 2.076 introduced a regression causing all threads to perform
    # piddle destruction. PDL cleanup should occur once, preferably by
    # the thread which instantiated the object.
    no warnings;
    sub PDL::DESTROY { 0; }
},

[download]

Not able to do the above, I want to mention that the strassen_07_t.pl example works fine as is in the repo by removing the line introduced in PDL 2.076.

SvOBJECT_off((SV *)it->sv);

[download]

In reply to Re^4: XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by marioroy
in thread XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by etj

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