Re: [Boost-bugs] [Boost C++ Libraries] #9282: performance regression in boost::unordered on 64-bit platforms

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9282: performance regression in boost::unordered on 64-bit platforms
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-02-23 20:39:02

#9282: performance regression in boost::unordered on 64-bit platforms
--------------------------+------------------------------------------------
  Reporter:  aiapub-      |      Owner:  danieljames
  cpp@…                   |     Status:  assigned
      Type:  Bugs         |  Component:  unordered
 Milestone:  Boost        |   Severity:  Regression
  1.56.0                  |   Keywords:  unordered mix64_policy performance
   Version:  Boost        |
  1.53.0                  |
Resolution:               |
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Comment (by danieljames):

 Thanks for the feedback. Exposing the policy is a good idea, but I'm not
 keen on adding an extra template parameter, so I'm thinking about adding a
 type trait for the hash function, which would let someone using a custom
 hash function indicate which strategy it is suited for. Actually, I'll
 bring up that up on the development list now.

 I decided in the end to use a prime policy for integers in the next
 release. This is slower in general, but this case is pretty important. The
 change is at:

 https://github.com/boostorg/unordered/commit/57819d1dd98d23f2a59f59bdb752420b5ae11d52


 I'll close this ticket when it's merged to master.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9282#comment:9>
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