[Semibug] Semibug Digest, Vol 64, Issue 1

[Matthew Mattox]

Question, is mount_mfs different than a RAM disk (mount -t tmpfs -o size=1024m myramdisk /tmp/ramdisk) ?

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> On Dec 5, 2021, at 11:00, semibug-request at lists.nycbug.org wrote:
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> Today's Topics:
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>   1. Re: Use mount_mfs to speed up programs (Jonathan Drews)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 3 Dec 2021 21:51:09 -0700
> From: Jonathan Drews <jondrews at fastmail.com>
> To: semibug at lists.nycbug.org
> Subject: Re: [Semibug] Use mount_mfs to speed up programs
> Message-ID: <YarzvWPMci9rLyuT at leo.easyfashionclothing.com>
> Content-Type: text/plain; charset=us-ascii
> 
>> On Tue, Nov 30, 2021 at 08:15:21AM -0500, Nick Holland wrote:
>>> On 11/30/21 4:00 AM, Jonathan Drews wrote:
>>> Hi Folks:
>>> 
>>>  I used Michael's book "Absolute OpenBSD" to setup MFS (Memory File
>>> System). It is also in man 8 mount_mfs. I did:
>>> 
>>> # mount_mfs -s 2048m /dev/sd0b /mnt
>> 
>> Quoting D. J. Bernstein: "Benchmark, don't speculate"
>> 
>> Having an MFS be 100x faster than your hard drive only matters if
>> your hard drive is a significant bottleneck.
>> 
>> If your program does little from the disk, you are more likely to
>> spend more time setting up the loading of the MFS than you will gain
>> from program execution.  And a LOT more time recreating data /when/
>> you forget to put the data back on real disk when you are done with
> 
> Nick and Michael:
> 
> Thanks for the advice on this. The MFS was interesting to play with but
> I will not use it. 
> 
> --
> Kind regards,
> Jonathan
> 
> 
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> End of Semibug Digest, Vol 64, Issue 1
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