Re: Performance on new 64bit server compared to my 32bit desktop
| От | Scott Marlowe |
|---|---|
| Тема | Re: Performance on new 64bit server compared to my 32bit desktop |
| Дата | |
| Msg-id | AANLkTi=6-iQ=btYdg79DVXof+Qib0O3obfy5ZDiMfMHR@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Performance on new 64bit server compared to my 32bit desktop (Yeb Havinga <yebhavinga@gmail.com>) |
| Список | pgsql-performance |
On Tue, Aug 31, 2010 at 12:55 PM, Yeb Havinga <yebhavinga@gmail.com> wrote: > Scott Marlowe wrote: >> >> On Tue, Aug 31, 2010 at 6:41 AM, Yeb Havinga <yebhavinga@gmail.com> wrote: >> >>>> >>>> export OMP_NUM_THREADS=4 >>>> >>> >>> Then I get the following. The rather wierd dip at 5 threads is consistent >>> over multiple tries: >>> >>> >> >> I get similar dips on my server. Especially as you make the stream >> test write a large enough chunk of data to outrun its caches. >> >> See attached png. >> > > Interesting graph, especially since the overall feeling is a linear like > increase in memory bandwidth when more cores are active. > > Just curious, what is the 8-core cpu? 8 core = dual 2352 cpus (2x4) 2.1 GHz 12 core = dual 2427 cpus (2x6) 2.2 GHz 48 core = quad 6127 cpus (4x12) 2.1 GHz -- To understand recursion, one must first understand recursion.
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