intel vs amd benchmark for pg server part 2
От | postgres@vrane.com |
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Тема | intel vs amd benchmark for pg server part 2 |
Дата | |
Msg-id | 20020426225235.A1316@amd.universe обсуждение исходный текст |
Ответы |
Re: intel vs amd benchmark for pg server part 2
Re: intel vs amd benchmark for pg server part 2 Re: intel vs amd benchmark for pg server part 2 |
Список | pgsql-general |
Because of a lot of unwarranted criticizms of my previous rigorous and outstanding :) benchmark and because I am lucky to come across a bargain maxtor drive I have done the test again. It put the same hard drive in both amd 1.33GHz and celeron 566MHz machine with exactly the same controller that comes with the drive. It's promise PDC20269 chipset and I have to run 2.4.19-pre7-ac2 to detect this controller and linux detects it as udma_133 drive. I point PGDATA to the directory on this hard drive on both machines. On amd # hdparm -tT /dev/hde /dev/hde: Timing buffer-cache reads: 128 MB in 0.78 seconds =164.10 MB/sec Timing buffered disk reads: 64 MB in 1.59 seconds = 40.25 MB/sec On celeron the first number is around 100 MB/sec and the second number is about the same. The drive is not in that system anymore and I didn't write the numbers down. The minimun time to vacuum on celeron I got was 61 seconds and whereas on amd it is 59 seconds. So it looks like vacuuming scales very linearly with hdparm results. And yes, with on board ide controller, AMD/sis box hdparm bottleneck is around 24MB/sec whereas corresponding number for intel box is 30MB/sec. The moral I get from this benchmark is that AMD is certainly not much better preformance/price wise at least not for a database server In fact for various reasons I am going to go with an intel box. Another gripe I have is that vacuum process does not eat up 100% of cpu. In the beginning it peaks around 80% and at the end it is stuck around 20%. Whenever I have a long running process and it is not eating up 100% of cpu I feel I am not getting my money's worth for the cpu. I wonder why vacuum process is not more parallelized if at all. I can imagine manually vacuuming many tables in parallel and it might eat up all cpu and I wonder whether it might finish quicker.
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