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Re: [rdiff-backup-users] Severe performance degradation
From: |
Maarten J H van den Berg |
Subject: |
Re: [rdiff-backup-users] Severe performance degradation |
Date: |
Wed, 22 Dec 2010 15:02:36 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.7) Gecko/20100816 Thunderbird/3.1.1 |
On 12/21/10 18:51, Jakob Unterwurzacher wrote:
>
> What about the kernel version? Probably barriers are now working as they
> should and you pay the price for that. dpkg package management had huge
> performance regressions due to this AFAIR.
Googled a bit on that but I'm left confused: are you talking about
memory barriers, ext4 barriers, or some other type ?
> Other than that, I'd try to find out where rdiff-backup is spending all
> the the time. What does
> iostat -dx 1
> in the %utils column say while an incremental is running?
> You could even fire up sysprof to see what it is waiting for.
We did monitor that a couple of weeks back. I do not have numbers
readily available now but we did not find a specific reason I believe.
For now I'm going to probably work around it by making the process a
two-phase one: first step rsync, second step rdiff-backup...
I may still do repaet tests with iostat later, if only to find out what
is causing this...
Cheers!
Maarten
> Regards,
> Jakob
>
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AW: [rdiff-backup-users] Severe performance degradation, D. Kriesel, 2010/12/21
Re: [rdiff-backup-users] Severe performance degradation, Adrian Klaver, 2010/12/21