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Re: 7.3 vs 7.4 performance

From: "Carlos Eduardo Smanioto" <csmanioto(at)uol(dot)com(dot)br>
To: "Christopher Browne" <cbbrowne(at)acm(dot)org>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: 7.3 vs 7.4 performance
Date: 2004-02-05 11:14:17
Message-ID: 003c01c3ebd9$35c724e0$cf00a8c0@smanote (view raw or flat)
Thread:
Lists: pgsql-performance
> I did some heavy-transaction-oriented tests recently on somewhat
> heftier quad-Xeon hardware, and found little difference between 2.4
> and 2.6, and a small-but-quite-repeatable advantage with FreeBSD 4.9.
> Now, I'm quite sure my load was rather different from yours, but I
> find the claim of doubling of speed rather surprising.
> --

What's the type of File System you used in the Linux? I am wanting to know
which is the operational system better for PostgreSQL: FreeBSD versus Linux
2.6.

Thanks.

[]'s
Carlos Eduardo Smanioto (Brazil)

----- Original Message -----
From: "Christopher Browne" <cbbrowne(at)acm(dot)org>
To: <pgsql-performance(at)postgresql(dot)org>
Sent: Thursday, February 05, 2004 3:32 AM
Subject: Re: [PERFORM] 7.3 vs 7.4 performance


> Oops! orion(at)trustcommerce(dot)com (Orion Henry) was seen spray-painting on a
wall:
> > I've done some testing of 7.3.4 vs 7.4.1 and found 7.4.1 to be 20%-30%
> > slower than 7.3.4.  Is this common knowledge or am I just unlucky with
> > my query/data selection?
>
> That seems unusual; the opposite seems more typical in view of there
> being some substantial improvements to the query optimizer.
>
> Have you tried doing EXPLAIN ANALYZE on the queries on both sides?
> There would doubtless be interest in figuring out what is breaking
> down...
>
> > Things of note that might matter: the machine is a dual Opteron
> > 1.4GHz running Fedora Core 1 Test 1 for X86_64.  The 7.3.4 was from
> > the Fedora distro and the 7.4.1 was the PGDG package.  The database
> > is 3.5 Gigs with 10 millions rows and the machine had 1 Gig or ram.
> >
> > Oh... as a side note I'm happy to announce that the 2.6 Linux kernel
> > has more than DOUBLED the speed of all my Postgres queries over the
> > 2.4. =)
>
> I did some heavy-transaction-oriented tests recently on somewhat
> heftier quad-Xeon hardware, and found little difference between 2.4
> and 2.6, and a small-but-quite-repeatable advantage with FreeBSD 4.9.
> Now, I'm quite sure my load was rather different from yours, but I
> find the claim of doubling of speed rather surprising.
> --
> (format nil "~S(at)~S" "aa454" "freenet.carleton.ca")
> http://www.ntlug.org/~cbbrowne/spiritual.html
> Failure is not an option. It comes bundled with your Microsoft product.
>
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