Hi, after ario, ncmpc seems to be the second interactive client I'm aware of to have "idle" support (mpdscribble has been using "idle" since january, and we have added the "idle" command to mpc in august). I have just merged several patches into the git repository, which will become ncmpc 0.16. The code base needed quite a bit of refactoring and cleanup to allow that change.
Here are some numbers, measured with "perf stat" on Linux 2.6.31. The clients were running for 60 seconds, connected to a MPD server which was stopped. There was no user input. ncmpc now: 3ms 3.7M instructions 7 context-switches ncmpc 1baf41: 16ms 25.9M instructions 246 context-switches ncmpcpp c03167: 23ms 34.9M instructions 314 context-switches gmpc bda5b9: 165ms 407.9M instructions 790 context-switches ario 4cc861: 313ms 776.7M instructions 577 context-switches ario 4cc861 idle: 305ms 756.7M instructions 375 context-switches pms 0.41: 587ms 1650.0M instructions 427 context-switches The goal is not to wake up the CPU and the network unless it is really needed. This allows the kernel to page out both MPD and ncmpc - which is not possible when the client wakes up MPD each second. The second major advantage of "idle" is reduced latency: if one client changes the volume, the other client will (practically) immediately display the new value, not half a second later. ncmpc "feels" much snappier with "idle". This is a big plus for users, because the latency experienced on all MPD clients can be annoying. Max ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Musicpd-dev-team mailing list Musicpd-dev-team@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/musicpd-dev-team
