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From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Dmitry Dolgov <9erthalion6@gmail.com>
Cc: David Steele <david@pgmasters.net>
Cc: Andres Freund <andres@anarazel.de>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: WIP: WAL prefetch (another approach)
Date: Sat, 6 Jun 2020 00:34:22 +0200
Message-ID: <20200605223422.r76a5rpl2zg2xo34@development> (raw)
In-Reply-To: <CA+hUKG+obB-e_VFa2uPVe52DvtpBQtC30vyo_PDURJQTr3SdJQ@mail.gmail.com>
References: <CA+hUKGK8KyMSKjSdjfZ=OGu0H56osaB5qjK1kRPf9NUamqDxyg@mail.gmail.com>
	<CA+hUKGKGhsRHhHJ4ybftCOjRxErnJYj-yOVamQaAsNmUBx4Aqg@mail.gmail.com>
	<CA+hUKGK6F66K9MJkLPBXTAxH8TM2Ozs7-FTbqsmJaHYVUOLDVg@mail.gmail.com>
	<226b5950-7404-a51d-8dc7-53895b363a38@pgmasters.net>
	<CA+hUKG+AzDLtAo1R3kxLW0nKRYd9euiBhW92OW1OCjkRU2E1pQ@mail.gmail.com>
	<20200419114820.h62ryte7uwu46e2x@localhost>
	<CA+hUKGJ7_niJzcCHX5JWFo-05pLbzwukQfFgQi4-h46yZh=tqA@mail.gmail.com>
	<20200425191935.4p6qxzzu5bklodwk@localhost>
	<20200502151423.yf52i63u232fdfrg@localhost>
	<CA+hUKG+obB-e_VFa2uPVe52DvtpBQtC30vyo_PDURJQTr3SdJQ@mail.gmail.com>

Hi,

I wonder if we can collect some stats to measure how effective the
prefetching actually is. Ultimately we want something like cache hit
ratio, but we're only preloading into page cache, so we can't easily
measure that. Perhaps we could measure I/O timings in redo, though?


regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services 





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