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From: Nazir Bilal Yavuz <[email protected]>
To: Cédric Villemain <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Change prefetch and read strategies to use range in pg_prewarm ... and raise a question about posix_fadvise WILLNEED
Date: Fri, 15 Mar 2024 15:12:31 +0300
Message-ID: <CAN55FZ1XrWS_xr2N=2316NHxMwFaCEfJku-pi9Yvda4LWU+DQw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAN55FZ3pZs77=6Na__eK23f_UvZfZAgxSUexHVrnqLvwoqNJ8w@mail.gmail.com>
	<[email protected]>
	<CAN55FZ1CsDDmhyJq_ZWM1h1eNpBqkxYbBaXVWfkS73MaS3-Rgw@mail.gmail.com>
	<[email protected]>

Hi,

On Thu, 7 Mar 2024 at 15:26, Cédric Villemain
<[email protected]> wrote:
>
> On 07/03/2024 12:19, Nazir Bilal Yavuz wrote:
> >
> > I did not test read performance but I am planning to do that soon.

I did not have the time to check other things you mentioned but I
tested the read performance. The table size is 5.5GB, I did 20 runs in
total.

When the OS cache is cleared:

Master -> Median: 2266.293ms, Avg: 2265.5038ms
Patched -> Median: 2166.493ms, Avg: 2183.6208ms

When the buffers are in the OS cache:

Master -> Median: 585.719ms, Avg: 583.5032ms
Patched -> Median: 533.071ms, Avg: 532.7119ms

Patched version is better on both. ~4% when the OS cache is cleared,
~%9 when the buffers are in the OS cache.

-- 
Regards,
Nazir Bilal Yavuz
Microsoft






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