Andrew Libby wrote:
> 
>>
>> So we calculated it and the ram comes to under a gig.  We've
>> got 4G of ram.  The system does not seem to swap when
>> processing a backup.   fsck also seems to be in good standing.
>>
>> Thanks for the suggestions,
>>
>> Andy
> 
> Okay, so I've got some more information.  Seems that the
> log in /var/lib/backuppc/log called LOG has
> 
> 2009-03-11 10:12:23 shyamalan: Out of memory!
> 2009-03-11 10:12:35 Backup failed on shyamalan (Child exited
> prematurely)
> 
> 
> 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.

> 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 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.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com



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