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Thread: semaphore access speed
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  #42 (permalink)  
Old 10-06-2008
ramen_noodle ramen_noodle is offline Forum Advisor  
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Join Date: Dec 2007
Location: Virginia, USA.
Posts: 251
Just for contrast on a modern intel SMP processor running linux 2.6.18 I get more
than a million operations/sec.
On that basis I don't believe this qualifies as a bug..more of a growing pain.
Linux has always been a project in forward motion. You either catch up or suffer.
Linus is short on apologies for this model that I've seen.

Code:
1402465.14 semop/s (5000000/3565151)
1409187.85 semop/s (5000000/3548143)
1448182.72 semop/s (5000000/3452603)

On a FreeBSD 6.0 machine (uniprocessor) the time is interesting...
Intel(R) Celeron(R) CPU 2.00GHz (1999.94-MHz 686-class CPU)

Code:
501281.02 semop/s (5000000/9974445)
500868.00 semop/s (5000000/9982670)
450727.95 semop/s (5000000/11093166)

Last edited by ramen_noodle; 10-08-2008 at 02:43 PM.. Reason: typo on kernel version