I think he's referring to my problem, which is caused by having one big, slow disk dedicated to holding all my music, and is sometimes mounted across teh network using NFS. I mainly attribute the problem to hardware deficiencies and don't see it as a bug in MPD, but rather a reasonable cause to object to automatic database updates, as the hardware in question is not archaic, and the problem is fairly reliable on fairly modern hardware. However, since you claim that mpd 0.15 should have many optimizations to eliminate that, when I update to 0.15 and find some music to add to my database, I'll file a bug report at that time if the problem persists since you mentioned "Blocking disk I/O" as a known problem at this time and it's clearly the main problem
On Sat, Apr 4, 2009 at 10:09 AM, Max Kellermann <m...@duempel.org> wrote: > On 2009/04/04 19:00, Stefan Monnier <monn...@iro.umontreal.ca> wrote: >> Then maybe I should report a bug: if I don't start mpd with "nice -10", >> I get skips on a regular basis, and it becomes unbearable as soon as >> I run other things in the background (typically rsync-over-ssh since >> I use the same box for my backups). I didn't report it since "nice -10" >> fixed it, and such things just seem fairly normal to me (tho, maybe mpd >> should/could do the "nice 10" itself when run as root). > > Only a real-time kernel can guarantee that MPD doesn't skip (provided > that the hardware is fast enough). Linux is not a real-time OS. > > What we do on Linux is use large buffers, and hope that there will > never be a delay longer than our buffer size. If other processes take > so much CPU or induce much latency (by blocking disk I/O, e.g.), MPD > can not compensate, and you hear skips. In that case, increase MPD's > scheduler priority (negative nice level) to reduce the probability. > > Of course, that rule of thumb is too easy for the real world. There > may be bugs in MPD which increase the probability of skips, and there > may be a lot of room for optimization. We will attempt to optimize > when we can measure such problems on a test system. During the 0.15 > development, MPD's internal latency has been reduced by orders of > magnitude, most of that with the implementation of reference counted > pages. > > Which MPD version were you using, Stefan? > > Max > > ------------------------------------------------------------------------------ > _______________________________________________ > Musicpd-dev-team mailing list > Musicpd-dev-team@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team > -- (\_/) This is Bunny. Copy and paste Bunny (='.'=) into your signature to help him gain (")_(") world domination. ------------------------------------------------------------------------------ _______________________________________________ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
