Les Mikesell wrote:
> Andrew Libby wrote:
>>
>>
>> I thought out of memory errors were to happen on the client,
>> rather than the server.  I don't know why I would think that
>> though.
> 
> The client sends the directory list to the server, then the server walks 
> though it comparing against the previous full.

Good to know, thanks.

> 
>> The server here has 4G, and as I said, the ram required for
>> the 6M files should be under a gig 6512257 * 100 == 621M
>> unless my math stinks (and it frequently does).
> 
> Where did you find the '100' factor?  I'd have guessed bigger - and I 
> think some versions of 64 bit perl have bugs that make it consume more 
> memory.  It might work better to stay 32-bit on a 4 gig machine - or add 
> more RAM if you are 64-bit.

My *100 concept cam from the rsync faq:

http://samba.anu.edu.au/rsync/FAQ.html#4

I don't know if the overhead associated with perl is higher
or lower.  I did see a reference in the archives to some
critical parts of the Rsync perl libraries being native
(compile C).  So this might suggest comparible overhead to
that of rsync.

The OS is 32 bit.

> 
>> My sar stats clearly show the backuppc server running out
>> of memory, but swap utilization remains low.
> 
> Sar takes snapshots at 10 minute intervals - you might easily miss 
> peaks.  If you are running more than one backup concurrently it might 
> help to cut back.
> 

Good point about the 10 minute interval.  And the sar usage
creeps up to 50% until the last check before the backup
fails, then drops to 9%.

Thanks much. This helps a lot.

Andy

-- 

===============================================
Tangeis, LLC
Andrew Libby
alibby AT tangeis DOT com
www.tangeis.com
610-761-1991
===============================================


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