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Re: pg_dump & performance degradation

From: Philip Warner <pjw(at)rhyme(dot)com(dot)au>
To: Don Baccus <dhogaza(at)pacifier(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org, brianb-pggeneral(at)edsamail(dot)com
Subject: Re: pg_dump & performance degradation
Date: 2000-07-29 13:27:45
Message-ID: 3.0.5.32.20000729232745.023e5ea0@mail.rhyme.com.au (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-hackers
At 05:28 29/07/00 -0700, Don Baccus wrote:
>At 02:14 PM 7/29/00 +1000, Philip Warner wrote:
>
>>>(AFAIR no one's ever asked for this before, so...)
>>
>>like most of these things (at least for me), it is personally relevant: I
>>also experience severe peformance degradation during backups.
>
>I can't think of any Unix utility that does this, offhand.
>
>"nice" doesn't help at all when you try it?

Only marginally; and what I really need to do is 'nice' the backend, and
when I do that it still only helps only a little - even if I drop it to the
lowest priority. I think a process with only a little CPU can still do a
lot of I/O requests, and perhaps it is getting swapped back in to service
the requests. This is just guesswork.




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