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Re: Measured: btrfs COW and sqlite exclusive locking

From: Branko Čibej <brane_at_wandisco.com>
Date: Fri, 13 Jul 2012 17:38:58 +0100

On 08.07.2012 17:47, Mattias Engdegård wrote:
> The biggest surprise was that COW actually made the checkout slightly
> slower, even though no "true" file copies were made. I'm not sure how
> to explain this---perhaps everything is already in cache so the copies
> aren't very expensive, or the COW operations are somehow synchronising?

Copy-on-Write requires some metadata and processing overhead compared to
just-plain copying, which obviously makes it slower. It's a time vs.
space optimization.

-- Brane

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Received on 2012-07-13 18:39:33 CEST

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