[Bioclusters] Xserve G5 memory

Michael Chute bioclusters@bioinformatics.org
Tue, 05 Oct 2004 16:41:05 -0400

Here is a link that gives a couple of ways to make a ramdisk in OSX.


Michael D. Chute
BSL-3 Lab Manager
Naval Medical Research Center
Biological Defense Research Directorate
Room 1N29
503 Robert Grant Ave.
Silver Spring, MD 20910
email: chutem@nmrc.navy.mil

> From: Al Tucker <act@comm.rockefeller.edu>
> Reply-To: <bioclusters@bioinformatics.org>
> Date: Tue, 5 Oct 2004 16:30:31 -0400
> To: <bioclusters@bioinformatics.org>
> Subject: Re: [Bioclusters] Xserve G5 memory
>> [I just finished composing this as Joe's post showed up]
>> Under most modern operating systems, BLAST databases automatically
>> get cached in memory by the OS as they are searched.  The operating
>> system typically uses all available memory (unused by currently
>> active applications) to cache frequently used data from files on
>> disk.
> <snip>
>> To the best of my knowledge, NCBI's blastall code uses memory-mapped
>> I/O whenever possible.
> <snip>
>> A quick hack to ensure the DB stays in memory would be creating a
>> RAMdisk and copy the DB onto it.  I think OS X supports RAMdisks.(?)
> I've been following this thread with interest.  I can contribute this
> - OS X doesn't have an inbuilt ramdisk option like Os 9 had, but
> there are 2 programs I know of (but have not used) that you can make
> a ramdisk with:  Disk Velox
> <http://www.versiontracker.com/dyn/moreinfo/macosx/24364> and Ram
> Disk Creator <http://www.donelleschi.com/ramdiskcreator/>
> - Al
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