On 07/01/10 15:27, Derek Harkness wrote:
> Sorry I miss spoke in the original post. I'm backing up a server which has
> 24x2.6ghz cpus and is barely using any of them. I bacula server is much
> smaller, only 4 cpus. It looks like bacula has a single threaded compress
> engine which appears to bottle neck the whole process. For most backup jobs
> this isn't a problem but for the size of these backups I need speed over
> backup size on disk.
>
>
It does indeed use a single threaded implementation of libz. Iirc, it
also works using fairly small block sizes (read, compress, read,
compress, read, compress...). Someone on bacula-devel may be able to
expand on this some more. The performance is still pretty slow even
with GZIP1.
> Thanks,
> Derek
>
> On Jul 1, 2010, at 11:55 , Gavin McCullagh wrote:
>
>
>> On Thu, 01 Jul 2010, Derek Harkness wrote:
>>
>>
>>> I've seen a very significant slow in backup speed by enabling gzip
>>> compress, 32MB/s (without gzip) vs 4MB/s (with gzip). The server I'm
>>> backing up has lots of CPU 24x2.6ghz so the compression time shouldn't be
>>> a huge factor. Is this normal for bacula or is there an optimization I'm
>>> missing.
>>>
>> As I understand it, the compression is done on the client (ie the file
>> daemon), not the server, so it's the CPU speed of the client you need to
>> consider, not that of the server. Is the CPU maxed out on the client
>> during the backup?
>>
>> Gavin
>>
>>
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