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Re: running postgres in a ramdisk

From: William Yu <wyu(at)talisys(dot)com>
To: Keith Keller <kkeller-sfpug(at)wombat(dot)san-francisco(dot)ca(dot)us>
Cc: SF Postgres <sfpug(at)postgresql(dot)org>
Subject: Re: running postgres in a ramdisk
Date: 2003-10-15 15:17:46
Message-ID: 3F8D651A.7050704@talisys.com (view raw or flat)
Thread:
Lists: sfpug
It's a hardwired limitation. I currently have an Opteron system with 8GB 
of memory running 32-bit Redhat and the max tmpfs I can make is 4GB.

And from reading the below message, it's possible it might still have 
the 4GB limit on a 64-bit OS.

http://archive.lug.boulder.co.us/bymonth/2002.08/msg00099.html


Keith Keller wrote:
> On Tue, Oct 14, 2003 at 04:12:22PM -0700, William Yu wrote:
> 
>>Tmpfs is dynamically resizable but the big 
>>gotcha is that under 32-bit Linux, you're limited to 4GB max for a 
>>ramdisk of any type.
> 
> 
> Hmm, that could be a huge problem--one of our tables is over 4GB.  I
> could be wrong, but can the kernel option to support more than 4GB of
> physical memory help here?  Or is it a limitation of the ramdisk itself?
> We do tentatively plan on using linux, though a kernel recompile is
> fairly easy for us to do.


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