| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Greg Smith <greg(at)2ndquadrant(dot)com>, Jon Nelson <jnelson+pgsql(at)jamponi(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: fallocate / posix_fallocate for new WAL file creation (etc...) |
| Date: | 2013-05-30 12:20:53 |
| Message-ID: | 20130530122053.GA14029@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2013-05-30 08:19:17 -0400, Peter Eisentraut wrote:
> On 5/30/13 8:02 AM, Robert Haas wrote:
> > If there's some OS out
> > there that chooses to fill the pre-extended pages with 0x55 or cat
> > /dev/urandom instead of 0x00, they probably deserve what they get.
>
> Even that wouldn't be a problem for our purpose. The only problem would
> be if you can't read from the allocated region at all.
Well, only as long as we only use it for preallocation of wal files. I
am much, much more interested in doing that for the heap. And there that
surely would be a problem.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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