| From: | "scott(dot)marlowe" <scott(dot)marlowe(at)ihs(dot)com> |
|---|---|
| To: | "alexandre :: aldeia digital" <alepaes(at)aldeiadigital(dot)com(dot)br> |
| Cc: | <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Pg+Linux swap use |
| Date: | 2003-10-30 20:08:50 |
| Message-ID: | Pine.LNX.4.33.0310301307510.23811-100000@css120.ihs.com |
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| Thread: | |
| Lists: | pgsql-performance |
On Thu, 30 Oct 2003, alexandre :: aldeia digital wrote:
> Hi,
>
> Old: Post 7.3.2, P4 1.8, 1 MB RAM, 2 x IDE SW RAID 1, RedHat 8
> New: Post 7.3.4, Xeon 2.4, 1 MB RAM, 2 x SCSI 15k SW RAID 1, RedHat 9
>
> Both use: Only postgresql on server. Buffers = 8192, effective cache = 100000
>
> In old plataform the free and vmstat reports no use of swap.
> In new, the swap is in constant use (40-100 MB), with a low but constant
> swap out and swap in. The cache memory ~ 830000 and buffers ~ 43000
Do both machines have the same amount of swap, and what kernels are the
two running? Also, do the xeons have hyperthreading turned on. I doubt
hyperthreading has anything to do with this problem, but I've found that
turning off hyperthreading in the BIOS gets me a faster machine under
Postgresql so I just thought I'd throw that out there.
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