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ccache report

I use ccache to save some recompiling time/heat, I currently have about
40G of files in the cache.

On NetBSD 6, i386, I just did a "pkg_rolling-replace -uvk" to bring a
system from mostly 2014Q4 to -current pkgsrc, to look for trouble before
the freeze.  This tried to rebuild 628 packages, with only failing.  The
cache stats were interesting; just over half of the compilations were
obtained from the cache.   I find that cache hits are much better when
doing subsequent rebuilds after fixing something, but still saving more
than 50% of compilation cpu time is helpful.

cache hit (direct)                 24152
cache hit (preprocessed)           10010
cache miss                         29157

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