[zeromq-dev] zmq::poll timeout returns immediately on MacOS/X 10.5

Steven McCoy steven.mccoy at miru.hk
Fri Jun 11 10:11:49 CEST 2010


On 11 June 2010 16:02, Steven McCoy <steven.mccoy at miru.hk> wrote:

> I've only seen the worst case scenario, like the 16ms timing in Windows,
> nothing much about Nehalem or event the Red Hat vsyscall other than they are
> "better".
>
>
The Red Hat detail,

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-RT_Specific_gettimeofday_speedup.html


This older article on Oracle seems more informative,

http://kevinclosson.wordpress.com/2007/01/24/gettimeofday-and-oracle-on-amd-processors/

"It takes 324 cycles per call to complete 1 million GTOD calls without
RDTSCP and 221 cycles per call with the capability."

Referencing this article,

http://developer.amd.com/documentation/articles/Pages/1214200692.aspx

<http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Realtime_Tuning_Guide/sect-Realtime_Tuning_Guide-Realtime_Specific_Tuning-RT_Specific_gettimeofday_speedup.html>
-- 
Steve-o
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