asterisk users - Apr 2006 - Re: update - 512 Simultaneous Callswith DigitalRecording

> Are there any advantages/disadvantages to using tmpfs as opposed to
the
> following method:
Matt,

Its simple. To quote the docs, "tmpfs lives entirely in the kernel's
caches"
It will shrink and grow to accommodate the files that currently on the
filesystem.

So if you allocate 10GB for your /tmp but only use 500MB it will only
use 500MB of RAM. Think of the time your server run out space on your
RAM drive...
With tmpfs you would still be ok for few weeks (provided you allocated
enough space). :) This will also benefit whole system if /tmp is located
on tmpfs, not that a stable, production asterisk system would actually
use /tmp much (if at all).

In short it gives you the benefits of LARGE RAM disk without allocating
all that memory beforehand and you don't have to format anything during
startup.

For further info look at the following link to tmpfs.txt from kernel's
docs
http://www.kernelhq.cc/browse-view.py?fv_nr=232372

Boris Bakchiev wrote:
>>Are there any advantages/disadvantages to using tmpfs as opposed to
>>    
>>
>the
>  
>
>>following method:
>>    
>>
>
>Matt,
>
>Its simple. To quote the docs, "tmpfs lives entirely in the
kernel's
>caches"
>It will shrink and grow to accommodate the files that currently on the
>filesystem.
>
>So if you allocate 10GB for your /tmp but only use 500MB it will only
>use 500MB of RAM. Think of the time your server run out space on your
>RAM drive...
>With tmpfs you would still be ok for few weeks (provided you allocated
>enough space). :) This will also benefit whole system if /tmp is located
>on tmpfs, not that a stable, production asterisk system would actually
>use /tmp much (if at all).
>
>In short it gives you the benefits of LARGE RAM disk without allocating
>all that memory beforehand and you don't have to format anything during
>startup.
>
>For further info look at the following link to tmpfs.txt from kernel's
>docs
>http://www.kernelhq.cc/browse-view.py?fv_nr=232372
>  
>
I'm not sure tmpfs is the right solution for the OP's problem - disk 
access slowing down the system. My understanding of tmpfs is that it 
will swap pages in and out to/from disk. Wouldn't that be as bad as 
directly writing to disk? I can see tmpfs will have some advantage over 
direct disk IO when the files are small and short-lived, i.e. less 
likely to be swapped.

Leo