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Re: Why is subversion so slow?

From: Tom Lord <lord_at_emf.net>
Date: 2003-04-09 04:58:14 CEST

       Am I reading the original report correctly?

       He claims that CVS creates a working copy of 370 files in *3*
       seconds? I know that the client and server are connected over
       a 100baseT LAN, but that's more than 120 files per second! Is
       a normal "copy" even that fast??

I don't know about CVS or the accuracy of the original report, but
unless I mistyped into M-x calc (always a possibility) his 1800kb tree
is around 7x below below the _raw_ bandwidth of the network (if
uncompressed -- 14x if compressed).

He's claiming 1/21 or 1/42 of the raw network bandwidth.

Googling around for file system benchmarks -- I don't see any reason
for skepticism there, either.

Suppose the tree being checked out were packaged as a tar file or
compressed tar file. How fast would you expect it to be to pipe a get
of that into `tar'?

It doesn't sound like that ridiculous a claim looking just at the
network and disk bandwidth. Looking at CVS protocol and
implementation details may or may not yield different results, though
-- I wouldn't know.


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Received on Wed Apr 9 04:49:05 2003

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