Finding slowdowns in pkg_install (continuations of
kientzle at freebsd.org
Fri Jul 6 16:01:54 UTC 2007
>> I'm currently running a gamut of tests (500 tests, per package --
>> 128 total on my server), and outputting all data to CSV files to
>> interpret later, using another Perl script to interpret calculated
>> averages and standard deviations.
Excellent! Much-needed work.
>> Using basic printf(2)'s with clock_gettime(2) I have determined
>> that the majority of the issues are disk-bound (as Tom Kientzle put
Next question: What are those disk operations and are any
of them redundant?
>> The scope of my problem is not to analyze tar,...
I've spent the last three years+ doing exactly that.
Make sure you're using the newest bsdtar/libarchive,
which has some very noticable performance improvements.
>> but I've
>> discovered that a lot of time is spent in reading and interpreting the
>> +CONTENTS and related files (most notably in parsing commands to be
Oh? That's interesting. Is data being re-parsed (in which case
some structural changes to parse it once and store the results
may help)? Or is the parser just slow?
>> Will post more conclusive results tomorrow once all of my results
>> are available.
I don't follow ports@ so didn't see these "conclusive results"
of yours. I'm very interested, though.
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