Re: [eigen] Help on solving a race condition

[john skaller <skaller@xxxxxxxxxxxxxxxxxxxxx>]

On 09/06/2012, at 12:57 AM, Gael Guennebaud wrote:

> On Fri, Jun 8, 2012 at 4:35 PM, Hauke Heibel
> <hauke.heibel@xxxxxxxxxxxxxx> wrote:
> 
>> #pragma omp critical
>> {
>>  static std::ptrdiff_t m_l1CacheSize =
>> manage_caching_sizes_helper(queryL1CacheSize(),8 * 1024);
>>  static std::ptrdiff_t m_l2CacheSize =
>> manage_caching_sizes_helper(queryTopLevelCacheSize(),1*1024*1024);
>> }
> 
> yes that would work, but mutex introduces a too large overhead. This
> function is called for every matrix product!


I may be missing the point here .. but why can't the cache sizes be 
compile time constants? You can check once at startup the user supplied
values are correct and generate them in a configuration step.


--
john skaller
skaller@xxxxxxxxxxxxxxxxxxxxx
http://felix-lang.org