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RE: Benchmarks for PUT for various fsfs config settings.

From: Markus Schaber <m.schaber_at_codesys.com>
Date: Thu, 3 Aug 2017 07:30:08 +0000

Hi, Paul,

> Here it is - http://imgur.com/a/vBeKi - a more interesting graph.

Yes, more interesting. :-)

And it somehow supports my point that, in some use cases, switching of deltification and rep sharing do no good.

The benefit of disabling compression is understandable, as it just wastes CPU on non-compressible data.

Disabling everything seems not the fastest way this time (while it skips all the processing, it has to write the whole file every time), while rep sharing and deltification can compensate the CPU overhead with writing just a few bytes at the end. I expect the difference to be bigger when the CPU is faster and I/O is slower.

> Server side Storage Used (MB):

> Default: 129
> No_Compression_No_Deltification: 257
> No_Deltification_No_Rep_Sharing: 513
> No_Compression_No_Deltification_No_Rep_Sharing: 513
> No_Rep_Sharing: 129
> No_Compression: 129
> No_Compression_No_Rep_Sharing: 129
> No_Deltification: 257

This is also pretty much what I expected.

Deltification and rep sharing almost compensate each other in this case (as we're modifying the same file). Rep sharing brings its real benefits when equal files are stored independently on the server, while deltification is best for small changes in the same file (or "historically related).

Thanks a lot!

Best regards

Markus Schaber

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From: Paul Hammant [mailto:paul_at_hammant.org]
Sent: Wednesday, August 02, 2017 3:28 PM
To: Markus Schaber
Cc: Subversion Development
Subject: Re: Benchmarks for PUT for various fsfs config settings.
Received on 2017-08-03 09:30:26 CEST

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