This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Note that investigating PADTMP hash pessimisation is to be done.
authorNicholas Clark <nick@ccl4.org>
Fri, 9 Nov 2007 17:57:45 +0000 (17:57 +0000)
committerNicholas Clark <nick@ccl4.org>
Fri, 9 Nov 2007 17:57:45 +0000 (17:57 +0000)
p4raw-id: //depot/perl@32254

pod/perltodo.pod

index e9cfa79..4b7ea0d 100644 (file)
@@ -758,6 +758,12 @@ implement per-thread working directories: Win32 already does this.
 
 See also L</"Extend PerlIO and PerlIO::Scalar">.
 
+=head2 Investigate PADTMP hash pessimisation
+
+The peephole optimier converts constants used for hash key lookups to shared
+hash key scalars. Under ithreads, something is undoing this work. See
+See http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2007-09/msg00793.html
+
 =head1 Big projects
 
 Tasks that will get your name mentioned in the description of the "Highlights