Hi again.TL;DR: on a slow HDD the slow-down can be noticeable, especially for large packages with lots of files.
On 02/12/2015 11:47 AM, Wout Mertens wrote:
Disadvantages: - Need to checksum all files written to the store * this is fast while writing the files because they still are in cache
I'm using the option for some time now on my slowly-rotating HDD with Btrfs. From the start I noticed that if lots of packages are just fetched from the binary cache, then the HDD is much bigger bottleneck than before. Today I hit an especially large one when testing opencascade - it worked for many minutes just writing the package into the store before I killed it - it's probably because the package is both large and has lots of files (~800 MB in ~62k files), so it likely didn't fit all into the cache while I was working on other things. It was built on another machine connected by a fast ethernet, so the problem was just the deduplication part (network was idle most of the time).
On an SSD the choice is much clearer of course, as they're both much faster to seek and smaller (in a comparable price range).
Vladimir
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