On Thu, May 28, 2009 at 16:35, Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx> wrote: > Now available for your delight and/or horror. > > <http://github.com/sourcejedi/udev/commits/threading-v0.3> > > For now, I'm still treating this as a patch series. That is, I may > publish future versions with a rewritten history. I'll preserve the old > branches though. > > It turns out the MADV_DONTFORK hack I was so proud of is > implementation-dependant, i.e. a dirty hack. However, I'm confident > that glibc can and should be modified to do it for all programs. And it > is so worth it. On my test machine, threading alone goes from 2s > boot-time coldplug to 1.3-ish. MADV_DONTFORK takes it down to 0.7-ish. > The hack is contained in the last patch, "when forking a program, only > copy the stack of the _current_ thread". Is that a single or dual CPU box? With the threaded version, it's 0.18 (1.51 -> 1.33) seconds faster here for a full coldplug run on a: Intel(R) Core(TM)2 Duo CPU U9400 @ 1.40GHz. It might be that the threaded version will only behave that much better on a single CPU machine? Thanks, Kay -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
