NAME

       latencytop - a tool for developers to visualize system latencies

SYNOPSIS

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

DESCRIPTION

       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.

SEE ALSO

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

AUTHOR

       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)