[distcc] Re: First results from distcc integrated cache

Dan Kegel dank at kegel.com
Sat Dec 10 01:14:43 GMT 2005

We discovered that the first benchmarks were run with
DISTCC_DIR defaulting to an NFS directory, which killed
the perfomance.  Here are some more real numbers for
a linux kernel build, courtesy of Dongmin Zhang:

155 sec  test system without distcc.
44 sec. normal distcc, eight-server cluster, -j8
46 sec. caching distcc on same cluster, first run
35 sec caching distcc on same cluster, second run

So with a perfectly preloaded cache, distcc went from 3x faster to 4x faster.

Switching to a faster hash code (adler32 instead of sha-1) didn't
change the results.

We're still playing around with this here, but it might be ready for other folks
to try and/or review.  Anyone interested?
- Dan

Why won't Johnny run Linux?  See http://kegel.com/linux/comfort

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