latencytop - a tool for developers to visualize system latencies

       latencytop was written by Arjan van de Ven <arjan@linux.intel.com>.

       This manual page was written by Giacomo Catenazzi <cate@debian.org>, for the Debian project (but  may  be
       used by others).

                                                November 9, 2008                                   LATENCYTOP(8)

       This manual page documents briefly the latencytop command.

       latencytop  is  a  Linux*  tool for software developers (both kernel and userspace), aimed at identifying
       where in the system latency is happening, and what kind of operation/action is  causing  the  latency  to
       happen so that the code can be changed to avoid the worst latency hiccups.

       LatencyTOP  focuses  on the cases where the applications want to run and execute useful code, but there's
       some resource that's not currently available (and the kernel then blocks the process). This is done  both
       on  a  system  level  and on a per process level, so that you can see what's happening to the system, and
       which process is suffering and/or causing the delays.

       You can walk the processes by using the cursor keys. If you press s  followed  by  a  letter,  then  only
       active  processes  starting  with that letter are displayed and walked. If you press s followed by 0 then
       that filter is reset.

       If you press f then LatencyTop displays a list of all processes currently waiting for an fsync to finish.
       Pressing f again returns you to the normal operating mode of LatencyTop.

       latencytop - a tool for developers to visualize system latencies

powertop(1)
       The program is more fully described at http://www.latencytop.org

latencytop [--unknown] [processes...]