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Groups > comp.programming.threads > #215

Re: False sharing

From Edek <edek.pienkowski@gmail.com>
Newsgroups comp.programming.threads
Subject Re: False sharing
Date 2011-05-31 21:18 +0200
Organization ATMAN - ATM S.A.
Message-ID <is3etk$pgf$1@node2.news.atman.pl> (permalink)
References <18fa2208-ba1c-42c5-bf1f-280e6cbc41e6@bl1g2000vbb.googlegroups.com> <is0un2$anb$1@node2.news.atman.pl> <eb6d6a69-ef08-4ebc-89dc-403886c3587f@24g2000yqk.googlegroups.com> <is3cgd$mnm$1@node2.news.atman.pl>

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I made one more test, of (work += i). This time with a
single thread (it can be argued there is no false-sharing with
a single thread ;) ).

Two threads:
real	0m3.449s
user	0m3.274s
sys	0m0.015s

One thread:
real	0m3.465s
user	0m6.318s
sys	0m0.037s

Of course, the loop count is 10x smaller than yours.

Edek

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Thread

False sharing curious <curious.oskar58@gmail.com> - 2011-05-30 04:26 -0700
  Re: False sharing Edek <edek.pienkowski@gmail.com> - 2011-05-30 22:29 +0200
    Re: False sharing curious <curious.oskar58@gmail.com> - 2011-05-31 03:21 -0700
      Re: False sharing Marcel Müller <news.5.maazl@spamgourmet.com> - 2011-05-31 15:41 +0200
        Re: False sharing curious <curious.oskar58@gmail.com> - 2011-05-31 10:18 -0700
        Re: False sharing Edek <edek.pienkowski@gmail.com> - 2011-05-31 20:10 +0200
      Re: False sharing Edek <edek.pienkowski@gmail.com> - 2011-05-31 20:37 +0200
        Re: False sharing Edek <edek.pienkowski@gmail.com> - 2011-05-31 21:18 +0200
          Re: False sharing curious <curious.oskar58@gmail.com> - 2011-05-31 14:40 -0700
            Re: False sharing "Balog Pal" <pasa@lib.hu> - 2011-06-01 03:17 +0200
            Re: False sharing Edek <edek.pienkowski@gmail.com> - 2011-06-01 22:20 +0200
        Re: False sharing curious <curious.oskar58@gmail.com> - 2011-05-31 14:29 -0700
  Re: False sharing David Schwartz <davids@webmaster.com> - 2011-05-31 14:12 -0700
  Re: False sharing "Chris M. Thomasson" <cristom@charter.net> - 2011-06-11 15:34 -0700
    Re: False sharing "Chris M. Thomasson" <cristom@charter.net> - 2011-06-11 19:56 -0700
      Re: False sharing "Chris M. Thomasson" <cristom@charter.net> - 2011-06-11 21:07 -0700

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