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 |
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Lists: | pgsql-general pgsql-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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