| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Greg Stark <stark(at)mit(dot)edu>, Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Geoghegan <pg(at)heroku(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Clock sweep not caching enough B-Tree leaf pages? |
| Date: | 2014-04-17 19:28:20 |
| Message-ID: | CAOuzzgoKgFN+NXKOQJL8mNfvv5rt_SW31J5tgmnww2uSQjBoNw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thursday, April 17, 2014, Merlin Moncure <mmoncure(at)gmail(dot)com> wrote:
>
> yeah -- the thing is, we are already too spendy already on
> supplemental write i/o (hint bits, visible bits, freezing, etc) and
> likely not worth it to throw something else on the pile unless the
> page is already dirty; the medium term trend in storage is that read
> vs write performance is becoming increasingly asymmetric, particularly
> on the random side so it's very unlikely to balance out.
>
Guess I wasn't clear but I was thinking to read the page in, not do any
writing, and do it in a asynchronous way to the process doing the evicting.
Thanks,
Stephen
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