Hi, as follow-up: The massive amounts of context switches is probably caused by the global lock on @sortdata, which is shared among the threads and changed a lot. Perl doesn't seem to provide a fine-granular locking mechanism for arrays. See also: http://www.nntp.perl.org/group/perl.ithreads/2008/09/msg1323.html Decide for yourself if this is considered a bug or just an intended but not-well scaling behaviour ... :) Thanks, Thomas
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