Stefan Zager <sza...@chromium.org> writes: > ... I used the Very Sleepy profiler > to see where all the time was spent on Windows: 55% of the time was > spent in OpenFile, and 25% in CloseFile (both in win32).
This is somewhat interesting. When we check things out, checkout_paths() has a list of paths to be checked out, and iterates over them and call checkout_entry(). I wonder if you can: - introduce a version of checkout_entry() that takes file descriptors to write to; - have an asynchronous helper threads that pre-open the paths to be written out and feed <ce, file descriptor to be written> to a queue; - restructure that loop so that it reads the <ce, file descriptor to be written> from the queue, performs the actual writing out, and then feeds <file descriptor to be closed> to another queue; and - have another asynchronous helper threads that reads <file descriptor to be closed> from the queue and close them. Calls to write (and preparation of data to be written) will then remain single-threaded, but it sounds like that codepath is not the bottleneck in your measurement, so.... -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
