Kacper Michajlow writes: > I recently noticed that Cygwin multithreading is very inefficient. I > was repacking few git repositories and with Cygwin's git, it spawns > threads but they are so badly synchronized that there is no speed gain > over one thread and possible loose because of the overhead. On my > machine I got 7-10% CPU usage while with git build with mingw easily > uses 100%.
I've been testing this again with my local copy of Emacs' Git repository and at least on this two-core system it works just fine (it was working fine on a four-core system earlier). The object count phase looks serialized and doesn't go over 50%, however a good deal of that is system time anyway, so I assume it's file access. The actual compression uses whatever CPU it can get, with the occasional spike in system time when it goes to disk (it's an SSD). Is your repo local or on some remote filesystem? Regards, Achim. -- +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+ SD adaptation for Waldorf microQ V2.22R2: http://Synth.Stromeko.net/Downloads.html#WaldorfSDada -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
