Confirming on not seeing recursion limit warnings :)

I tried various examples on PerlMonks. Getting WARNINGs with PDL 2.079 running demonstration 11115875. That was not the case before when the example was created.

WARNING: PDL::Primitive::vsearch_insert_leftmost does not handle bad v
+alues.
WARNING: PDL::Primitive::vsearch_insert_leftmost does not handle bad v
+alues.
...
[download]

Unfortunately, vr's serial demonstration 11116069 runs poorly; 42s versus 19s targ(1). It requires disabling auto-parallelization.

PDL::set_autopthread_targ(1);
[download]

Using the 2nd example (the one for Windows, but also runs on UNIX) 11116094, there is no improvement beyond 8 workers on the Windows platform. On Linux, no problem where more workers up to the number of logical cores improves performance (less time). So I updated the code to cap at 8 workers max on Windows. Strawberry Perl 5.32.1.1 PDL edition (w/ included PDL 2.021) is noticeably faster versus PDL 2.079. Is that the case for you?

PDL 2.021 using Strawberry Perl 5.32.1.1 PDL edition (max 8 workers on
+ Windows)
perl demo_win.pl 1e7 :  3.778 seconds
perl demo_win.pl 1e8 : 37.008 seconds

PDL 2.079 using Strawberry Perl 5.32.1.1 PDL edition (PDL updated to 2
+.079)
perl demo_win.pl 1e7 :  4.143 seconds
perl demo_win.pl 1e8 : 42.302 seconds
[download]

I ran the same demonstration on Ubuntu Linux 20.04 using Perl 5.30.0 and PDL 2.079.

perl demo_win.pl 1e7 :  3.288 seconds ( 8 workers)
perl demo_win.pl 1e8 : 41.899 seconds

perl demo_win.pl 1e7 :  2.331 seconds (16 workers)
perl demo_win.pl 1e8 : 23.329 seconds

perl demo_win.pl 1e7 :  1.642 seconds (24 workers)
perl demo_win.pl 1e8 : 16.941 seconds

perl demo_win.pl 1e7 :  1.310 seconds (32 workers)
perl demo_win.pl 1e8 : 13.198 seconds

perl demo_win.pl 1e7 :  1.139 seconds (40 workers)
perl demo_win.pl 1e8 : 10.925 seconds

perl demo_win.pl 1e7 :  1.004 seconds (48 workers)
perl demo_win.pl 1e8 :  9.791 seconds

perl demo_win.pl 1e7 :  0.946 seconds (56 workers)
perl demo_win.pl 1e8 :  8.913 seconds

perl demo_win.pl 1e7 :  0.877 seconds (64 workers)
perl demo_win.pl 1e8 :  8.305 seconds
[download]

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