Groups > comp.programming.threads > #265

Re: False sharing

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From	"Chris M. Thomasson" <cristom@charter.net>
Newsgroups	comp.programming.threads
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Subject	Re: False sharing
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Date	Sat, 11 Jun 2011 21:07:30 -0700
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"Chris M. Thomasson" <cristom@charter.net> wrote in message 
news:tVVIp.1449$z%.742@newsfe12.iad...
[...]

> Perhaps `struct shared_state' should be defined as:
> ______________________________________________________
> COMPILER_PADDING(OFF)
> struct shared_state
> {
>    atomic_word_t state_1;
>    char l2_cache_pad_1[L2_CACHE_ATOMIC_WORD_PAD];
>
>    atomic_word_t state_2;
>    /* char l2_cache_pad_2[L2_CACHE_ATOMIC_WORD_PAD]; */
>
>    atomic_word_t writers_complete;
>    char l2_cache_pad_3[L2_CACHE_ATOMIC_WORD_PAD * 2];
> };
> ______________________________________________________


Ummm.... That should be:
______________________________________________________
COMPILER_PADDING(OFF)
struct shared_state
{
    atomic_word_t state_1;
    char l2_cache_pad_1[L2_CACHE_ATOMIC_WORD_PAD];

    atomic_word_t state_2;
    atomic_word_t writers_complete;
    char l2_cache_pad_2[L2_CACHE_ATOMIC_WORD_PAD -
                                      sizeof(atomic_word_t)];
};
______________________________________________________


;^o

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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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