Performance!
Krassimir Slavchev
krassi at bulinfo.net
Fri Jan 11 03:09:58 PST 2008
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Kris Kennaway wrote:
> Krassimir Slavchev wrote:
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>> Kris Kennaway wrote:
>>> Krassimir Slavchev wrote:
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>>>> Hello,
>>>>
>>>> Kris Kennaway wrote:
>>>>> Krassimir Slavchev wrote:
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>>>>>> Hello,
>>>>>>
>>>>>> Here are lock profiling results with select patch applied.
>>>>> OK, you are doing I/O over TCP. Are you sure you are using TCP on
>>>>> both
>>>>> systems? Linux may not be defaulting to TCP transport for local
>>>>> queries.
>>>>>
>>>>> Add --pgsql-host="" to your sysbench command line to make it
>>>>> communicate
>>>>> over a local domain socket, which is much more efficient.
>>>>>
>>>>> Kris
>>>>>
>>>> Hmm, Yes linux uses local domain sockets!
>>>> Here are results using local domain sockets on FreeBSD too:
>>>> #threads #tranzactions/sec
>>>> 1 728
>>>> 5 2996
>>>> 10 5301
>>>> 20 3931
>>>> 40 2466
>>>> 60 1852
>>>> 80 1424
>>>> 100 1216
>>>>
>>>> Just to remember:
>>>> Linux (2.6.18)
>>>> #threads #transactions/sec
>>>> 1 693
>>>> 5 3539
>>>> 10 5789
>>>> 20 5791
>>>> 40 5661
>>>> 60 5517
>>>> 80 5401
>>>> 100 5319
>>>>
>>>> I have results using Fedora 8 on the same hardware:
>>>> Linux (2.6.23)
>>>> #threads #transactions/sec
>>>> 1 740
>>>> 5 2675
>>>> 10 6486
>>>> 20 6893
>>>> 40 6623
>>>> 60 6623
>>>> 80 6522
>>>> 100 6417
>>>>
>>>> If we look at the results with up to 10 threads the performance of
>>>> FreeBSD is very good.
>>>> May be something can be tuned for number of threads > number of CPUs?
>>>>
>>>> Are you interested in lock profiling statistics with more threads than
>>>> the number of CPUs?
>>> Yes, it's still performing anomalously. Glad we're making progress
>>> though :)
>>>
>>> Kris
>>>
>>
>> Okay, but how many threads will be more useful to test with?
>
> Let's start with 8 and say 40. The two problems seem to be slightly
> lower peak and poor scaling above peak. They might be the same, or they
> might be different.
>
> kris
>
>
I sent to you the results with 8 and 40 threads.
The lower peak may be caused by differences in installations like
different partitions I use ... The most important is keeping performance
above this peak.
Best Regards
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