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Re: my cmdline tests are extremely slow

From: Julian Foad <julianfoad_at_btopenworld.com>
Date: Thu, 30 Oct 2008 17:53:09 +0000

On Thu, 2008-10-30 at 10:49 -0400, C. Michael Pilato wrote:
> Neels J. Hofmeyr wrote:
> >
> > Stefan Sperling wrote:
> >> On Thu, Oct 09, 2008 at 07:28:43AM +0200, Neels J Hofmeyr wrote:
> >>> Also, I haven't actually checked *all* of the commandline tests. It takes
> >>> ages to complete, with apparent longer breaks of doing nothing at all, when
> >>> watching the CPU and disk activity.
> >>>
> >>> And then I have to run it twice, once for trunk and once for my patch, to be
> >>> able to compare test outcomes. How do you handle this kind of situation?
> >> Use a RAM disk to host temporary test data.
> >> See http://subversion.tigris.org/faq.html#ramdisk-tests
> >
> > So I did that. But still, running merge_tests.py --cleanup in the ramdisk
> > has random pauses of all activity for sometimes as much as 15 seconds.
> > That's ridiculous. Why can't it just race through the tests, idling at most
> > a second at a time? Why is my CPU staying cold?
> >
> > I've also seen that if I run a single test, it goes swiftly. Then, if I run
> > a whole list of them, there appear to be completely random pauses between
> > the tests sometimes, and sometimes not. It's weirding me out...
>
> I'm guessing it's a lack of entropy? See if during your pauses things go
> faster when you jiggle your mouse. (And then try compiling APR with
> --with-devrandom=/dev/urandom so you don't have to do said jiggling all the
> time.)

By the way, there is one test in the test suite that purposefully waits
until the next minute boundary. I think it's checkout_tests 12.

I'd welcome any improvement to that test. I don't think it needs to do
the long delay.

- Julian

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Received on 2008-10-30 18:53:36 CET

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