Re: [Duplicity-talk] Duplicity 4.2.1 on CentOS 4.7 causing resource shortage on VPS

[Kenneth Loafman]

Marcus Clements wrote:
> There certainly is a spike in the number of processes when the backup runs:
> http://brightonart.eu/images/processes-week.png
> 
> Marcus
> 
> 2009/3/4 Douglas Muth <address@hidden>:
>> On Wed, Mar 4, 2009 at 11:48 AM, Marcus Clements
>> <address@hidden> wrote:
>>> I'm not surprised to hear grumbles about Dreamhost, the service seems
>>> pretty awful, but I'm interested to understand how the target server
>>> affects memory resource use on the originating server.
>>>
>> Yeah, I guess I should have elaborated on that. :-)
>>
>> My experience with Dreamhost specifically revolved around massive
>> amounts of I/O wait.  Like, doing an "ls -l" would take some seconds,
>> and writing a file to disk would take even longer.
>>
>> One possibility is that if Dreamhost were taking forever to write
>> files, the data to be written could be "piling up" on the source
>> machine, and causing the spike in memory. Not knowing the internals of
>> Duplicity, I could also be flat out wrong. :-)  Maybe the author of
>> Duplicity could shed some light on this idea.

It's not piling up on the source machine unless you're using the
experimental --asyncronous-upload option.  Even then, it would only save
one volume ahead of the network, but not in memory, on disk, so not much
there to worry about.

I'm not sure what's running that would cause the problem.  I've done
some googling on 'simfs', but don't see anything.  Do you know what
virtualization software they use?

...Ken

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