From: | Bill Barnes <bbarnes(at)operamail(dot)com> |
---|---|
To: | Alfred Perlstein <bright(at)wintelcom(dot)net>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
Cc: | Bryan White <bryan(at)arcamax(dot)com>, Jesse Estevez <jestevez(at)travel-italy(dot)com>, Matthias Urlichs <smurf(at)noris(dot)de>, pgsql-general <pgsql-general(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Subject: | RE: PG 7.0 is 2.5 times slower running a big report |
Date: | 2000-05-26 15:43:25 |
Message-ID: | 395D342A@operamail.com |
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Thread: | |
Lists: | pgsql-general |
Might I suggest a change in the name of this thread or starting a new one.
The subject problem was resolved sometime ago and this is just bad publicity.
Almost scare me off till I read the user with the problem was now happy.
Bill Barnes
>===== Original Message From Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> =====
>> The statement:
>>
>> > > BSD file systems turn off prefetch only if prefetched blocks remain
>> > > unused.
>>
>> is false for FreeBSD afaik.
>>
>> FreeBSD tracks how often sequential access happens and will retry it
>> as the file's access trend indicates. It can flip back and forth from
>> readahead and non-readahead.
>
>Yes, read my later posting describing the actual algorithm. Let me know
>if it is wrong.
>
>--
> Bruce Momjian | http://www.op.net/~candle
> pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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