On Wed, Aug 15, 2012 at 11:24:41PM -0700, Gregory Szorc wrote: > On 8/15/12 11:10 PM, Mike Hommey wrote: > >Something I noticed recently is that we spend more than 5 minutes (!) > >during windows clobber builds to do the clobber (rm -rf). All try builds > >are clobbers. A lot of time is wasted on mercurial cloning, too. > > > >What is interesting is that the corresponding times are in the order of > >seconds on linux and osx. We're just hitting the fact that windows sucks > >at I/O. > > That is an over-generalization. I/O on Windows itself does not suck. > I/O on Windows sucks when you are using the POSIX APIs instead of > the Win32 ones.
Removing thousands of files and gigabytes of data in windows is slow. That's a fact. For example, see http://superuser.com/questions/19762/mass-deleting-files-in-windows/289399 (And if you /really/ want to waste time, try deleting files from the file explorer instead of the command line) > And, I'm willing to bet that rm (along with most of the GNU tools in > our MozillaBuild environment) is using the POSIX APIs or is at least > not using the most optimal Win32 API for the desired task. > > A few months back, John Ford wrote a standalone win32 executable > that used the proper APIs to delete an entire directory. I think he > said that it deleted the object directory 5-10x faster or something. > No clue what happened with that. I wish this were true, but I seriously doubt it. I can buy that it's faster, but not 5-10 times so. Mike _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
