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Postings from March 2007
On Sat, Mar 24, 2007 at 08:22:13AM +0100, Rafael Garcia-Suarez wrote: > On 23/03/07, Nicholas Clark <nick@ccl4.org> wrote: > >Yes, with PERL_DESTRUCT_LEVEL=2 Solaris now takes 2 hours to run t/op/pat.t > > > >We seem to have hit pathological malloc behaviour. I'm not quite sure how, > >or why, given that Linux copes. > Without any PERL_DESTRUCT_LEVEL, t/op/pat is extremely slow. Another > hint that we hit some malloc pathological case here. strace() shows > that the tests that are slowed down are towards the end... Without PERL_DESTRUCT_LEVEL, a flat profile from gprof starts: % cumulative self self total time seconds seconds calls ms/call ms/call name 26.7 13.44 13.44 1186773 0.01 0.01 S_regmatch <cycle 1> [9] 17.0 22.00 8.56 22 389.03 389.03 S_make_trie_failtable [13] 12.4 28.23 6.24 103 60.54 60.85 S_make_trie <cycle 1> [15] With PERL_DESTRUCT_LEVEL=2, we see: % cumulative self self total time seconds seconds calls ms/call ms/call name 88.0 371.92 371.92 531443 0.70 0.79 S_visit [5] 3.2 385.52 13.60 1186773 0.01 0.01 S_regmatch <cycle 1> [8] 2.0 394.07 8.55 22 388.62 388.62 S_make_trie_failtable [10] 1.5 400.27 6.20 103 60.21 60.48 S_make_trie <cycle 1> [11] Profiles at http://www.ccl4.org/~nick/P/pat.t.profiletxt http://www.ccl4.org/~nick/P/pat.t.profile.D2.txt respectively. So. I don't think that the problem was quite what we thought that it was :-) Are we making lots more SVs? Or are we just bumping the refcounts through the roof? Nicholas ClarkThread Previous | Thread Next