NAME

Sys::Statistics::Linux::Processes - Collect linux process statistics.

SYNOPSIS

    use Sys::Statistics::Linux::Processes;

    my $lxs = Sys::Statistics::Linux::Processes->new;
    # or Sys::Statistics::Linux::Processes->new(pids => \@pids)

    $lxs->init;
    sleep 1;
    my $stat = $lxs->get;

DESCRIPTION

Sys::Statistics::Linux::Processes gathers process informations from the virtual /proc filesystem (procfs).

For more informations read the documentation of the front-end module Sys::Statistics::Linux.

PROCESS STATISTICS

Generated by /proc/<pid>/stat, /proc/<pid>/status, /proc/<pid>/cmdline and getpwuid().

Note that if /etc/passwd isn't readable, the key owner is set to N/a.

    ppid      -  The parent process ID of the process.
    nlwp      -  The number of light weight processes that runs by this process.
    owner     -  The owner name of the process.
    pgrp      -  The group ID of the process.
    state     -  The status of the process.
    session   -  The session ID of the process.
    ttynr     -  The tty the process use.
    minflt    -  The number of minor faults the process made.
    cminflt   -  The number of minor faults the child process made.
    mayflt    -  The number of mayor faults the process made.
    cmayflt   -  The number of mayor faults the child process made.
    stime     -  The number of jiffies the process have beed scheduled in kernel mode.
    utime     -  The number of jiffies the process have beed scheduled in user mode.
    ttime     -  The number of jiffies the process have beed scheduled (user + kernel).
    cstime    -  The number of jiffies the process waited for childrens have been scheduled in kernel mode.
    cutime    -  The number of jiffies the process waited for childrens have been scheduled in user mode.
    prior     -  The priority of the process (+15).
    nice      -  The nice level of the process.
    sttime    -  The time in jiffies the process started after system boot.
    actime    -  The time in D:H:M:S (days, hours, minutes, seconds) the process is active.
    vsize     -  The size of virtual memory of the process.
    nswap     -  The size of swap space of the process.
    cnswap    -  The size of swap space of the childrens of the process.
    cpu       -  The CPU number the process was last executed on.
    wchan     -  The "channel" in which the process is waiting.
    fd        -  This is a subhash containing each file which the process has open, named by its file descriptor.
                 0 is standard input, 1 standard output, 2 standard error, etc. Because only the owner or root
                 can read /proc/<pid>/fd this hash could be empty.
    cmd       -  Command of the process.
    cmdline   -  Command line of the process.

Generated by /proc/<pid>/statm. All statistics provides information about memory in pages:

    size      -  The total program size of the process.
    resident  -  Number of resident set size, this includes the text, data and stack space.
    share     -  Total size of shared pages of the process.
    trs       -  Total text size of the process.
    drs       -  Total data/stack size of the process.
    lrs       -  Total library size of the process.
    dtp       -  Total size of dirty pages of the process (unused since kernel 2.6).

It's possible to convert pages to bytes or kilobytes. Example - if the pagesize of your system is 4kb:

    $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES =    0; # pages (default)
    $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES =    4; # convert to kilobytes
    $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES = 4096; # convert to bytes

METHODS

new()

Call new() to create a new object.

    my $lxs = Sys::Statistics::Linux::Processes->new;

It's possible to handoff an array reference with a PID list.

    my $lxs = Sys::Statistics::Linux::Processes->new(pids => [ 1, 2, 3 ]);

init()

Call init() to initialize the statistics.

    $lxs->init;

get()

Call get() to get the statistics. get() returns the statistics as a hash reference.

    my $stat = $lxs->get;

EXPORTS

No exports.

SEE ALSO

proc(5)

perldoc -f getpwuid

REPORTING BUGS

Please report all bugs to <jschulz.cpan(at)bloonix.de>.

AUTHOR

Jonny Schulz <jschulz.cpan(at)bloonix.de>.

COPYRIGHT

Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

cpanm Sys::Statistics::Linux

perl -MCPAN -e shell
install Sys::Statistics::Linux