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Re^3: Much slower DBI on RHEL6

by Anonymous Monk
on Feb 06, 2014 at 10:20 UTC ( #1073677=note: print w/replies, xml ) Need Help??

in reply to Re^2: Much slower DBI on RHEL6
in thread Much slower DBI on RHEL6

Perl 5.10 IIRC was one of the less optimised Perl versions. I think some benchmarks put it 20-50% slower than 5.8. 5.12 and 5.14 improved the speed much. (Sorry, no sources to back this up at this time.)

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Re^4: Much slower DBI on RHEL6
by chromatic (Archbishop) on Feb 06, 2014 at 19:04 UTC

    That's exactly right. Perl 5.10.0 accidentally disabled a list assignment optimization. Perl 5.10.1 re-enabled that optimization and a lot of functions which perform list assignment from @_ run faster under 5.10.1 than they did with 5.10.0.

      Hm; I was under the impression that the 5.10.1 patchlevel did not restore the performance -- at least all of it -- and assumed the latest patchlevel with each major version in my statement. That is, my statement was '5.10.1 was slow compared to 5.8.9 and 5.12.4 and 5.14.4'

      But please don't mind me -- I may be talking out of my arse.

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