Re: Streamy FS writes found detrimental.

On Wed, 27 Feb 2002, Eric Gillespie wrote:

> Greg Stein <gstein@lyra.org> writes:
>
> > 1381 commits in almost exactly six months. So a little over 200
> > a month, or about 7 per day on average.
>
> I hope that's not the only activity level you're expecting:

Err, no, i was trying to gauge the impact of running archive cleanup on
every commit for a real repository, which has less commits per
second/hour/whatever than the cvs repository conversions i usually run.
So I asked Greg for some real numbers, being short on them myself.

7 vs 40 vs 100 isn't that big a deal.

at 100 commits a day, that's still only 4 per hour, or one every 15
minutes.

Anything less than probably a commit every 5 seconds (which is what my
cvs2svn conversions average) is probably okay to do log_archiving per
commit on.

This is from informal speed testing of the log archiver, of course.
Log archiving is just wasting cpu time more than disk time (it builds the
array, qsort's it, removes duplicates, then returns it).
That's like 17280 commits a day.
:)

In other words, my perceptions are just biased by the fact that i do
mainly repo conversions. It would be just fine to do db_archiving
per-commit.

--Dan

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Received on Sat Oct 21 14:37:10 2006