From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: high io BUT huge amount of free memory |
Date: | 2013-05-02 17:04:08 |
Message-ID: | 51829C88.6050100@agliodbs.com |
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Thread: | |
Lists: | pgsql-hackers |
> That's kind of my point. :) That 14GB isn't allocated to cache, buffers,
> any process, or anything else. It's just... free. In the middle of the
> day, where 800 PG threads are pulling 7000TPS on average. Based on that
> scenario, I'd like to think it would cache pretty aggressively, but
> instead, it's just leaving 14GB around to do absolutely nothing.
>
> It makes me sad. :(
Yeah, this is why I want to go to Linux Plumbers this year. The
Kernel.org engineers are increasingly doing things which makes Linux
unsuitable for applications which depend on the filesystem. There is a
good, but sad, reason for this: IBM and Oracle and their partners are
the largest employers of people hacking on core Linux memory/IO
functionality, and both of those companies use DirectIO extensively in
their products.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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