Test timing stats.

[Dawid Weiss <da...@gmail.com>]

Hi. Would somebody who has a physical machine running jenkins add the
following as a post-run step?

ant -f lucene/build.xml test-updatecache -Dtests.cachefile=XXX

where XXX is preferably a path to a file somewhere outside of the
build area (so that it's not cleaned/ removed between builds)? This
will update build times with a history of 20 builds per suite. Once in
a while this file should be copied to:

lucene/tools/junit4/cached-timehints.txt

These are hints for test load balancer if multiple jvms are used (just
a remainder -- the order of suites is still randomized within a single
jvm, and only a fraction of the suites are initially load-balanced,
the rest is delegated to job stealing to level jvm times).

I'm currently running a few builds to update the stats, but for the
future it'd be a nice side effect of jenkins runs.

Dawid

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