On Wed, Feb 15, 2012 at 01:35:05AM +0200, Marko Kreen wrote: > On Tue, Feb 14, 2012 at 05:59:06PM -0500, Tom Lane wrote: > > Bruce Momjian <br...@momjian.us> writes: > > > On Mon, Feb 13, 2012 at 08:28:03PM -0500, Tom Lane wrote: > > >> +1, I was about to suggest the same thing. Running any of these tests > > >> for a fixed number of iterations will result in drastic degradation of > > >> accuracy as soon as the machine's behavior changes noticeably from what > > >> you were expecting. Run them for a fixed time period instead. Or maybe > > >> do a few, then check elapsed time and estimate a number of iterations to > > >> use, if you're worried about the cost of doing gettimeofday after each > > >> write. > > > > > Good idea, and it worked out very well. I changed the -o loops > > > parameter to -s seconds which calls alarm() after (default) 2 seconds, > > > and then once the operation completes, computes a duration per > > > operation. > > > > I was kind of wondering how portable alarm() is, and the answer > > according to the buildfarm is that it isn't. > > I'm using following simplistic alarm() implementation for win32: > > https://github.com/markokr/libusual/blob/master/usual/signal.c#L21 > > this works with fake sigaction()/SIGALARM hack below - to remember > function to call. > > Good enough for simple stats printing, and avoids win32-specific > code spreading around.
Wow, I wasn't even aware this compiled in Win32; I thought it was ifdef'ed out. Anyway, I am looking at SetTimer as a way of making this work. (Me wonders if the GoGrid Windows images have compilers.) I see backend/port/win32/timer.c so I might go with a simple "create a thread, sleep(2), set flag, exit" solution. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
