1Sys::Statistics::Linux:U:sPerrocCeosnstersi(b3u)ted PerlSyDso:c:uSmteanttiasttiiocns::Linux::Processes(3)
2
6 Sys::Statistics::Linux::Processes - Collect linux process statistics.
7
9 use Sys::Statistics::Linux::Processes;
10 my $lxs = Sys::Statistics::Linux::Processes->new;
12 # or Sys::Statistics::Linux::Processes->new(pids => \@pids)
13 $lxs->init;
15 sleep 1;
16 my $stat = $lxs->get;
17
19 Sys::Statistics::Linux::Processes gathers process information from the
20 virtual /proc filesystem (procfs).
21 For more information read the documentation of the front-end module
23 Sys::Statistics::Linux.
24
26 Generated by /proc/<pid>/stat, /proc/<pid>/status, /proc/<pid>/cmdline
27 and getpwuid().
28 Note that if /etc/passwd isn't readable, the key owner is set to N/a.
30 ppid - The parent process ID of the process.
32 nlwp - The number of light weight processes that runs by this process.
33 owner - The owner name of the process.
34 pgrp - The group ID of the process.
35 state - The status of the process.
36 session - The session ID of the process.
37 ttynr - The tty the process use.
38 minflt - The number of minor faults the process made.
39 cminflt - The number of minor faults the child process made.
40 mayflt - The number of mayor faults the process made.
41 cmayflt - The number of mayor faults the child process made.
42 stime - The number of jiffies the process have beed scheduled in kernel mode.
43 utime - The number of jiffies the process have beed scheduled in user mode.
44 ttime - The number of jiffies the process have beed scheduled (user + kernel).
45 cstime - The number of jiffies the process waited for childrens have been scheduled in kernel mode.
46 cutime - The number of jiffies the process waited for childrens have been scheduled in user mode.
47 prior - The priority of the process (+15).
48 nice - The nice level of the process.
49 sttime - The time in jiffies the process started after system boot.
50 actime - The time in D:H:M:S (days, hours, minutes, seconds) the process is active.
51 vsize - The size of virtual memory of the process.
52 nswap - The size of swap space of the process.
53 cnswap - The size of swap space of the childrens of the process.
54 cpu - The CPU number the process was last executed on.
55 wchan - The "channel" in which the process is waiting.
56 fd - This is a subhash containing each file which the process has open, named by its file descriptor.
57 0 is standard input, 1 standard output, 2 standard error, etc. Because only the owner or root
58 can read /proc/<pid>/fd this hash could be empty.
59 cmd - Command of the process.
60 cmdline - Command line of the process.
61 Generated by /proc/<pid>/statm. All statistics provides information
63 about memory in pages:
64 size - The total program size of the process.
66 resident - Number of resident set size, this includes the text, data and stack space.
67 share - Total size of shared pages of the process.
68 trs - Total text size of the process.
69 drs - Total data/stack size of the process.
70 lrs - Total library size of the process.
71 dtp - Total size of dirty pages of the process (unused since kernel 2.6).
72 It's possible to convert pages to bytes or kilobytes. Example - if the
74 pagesize of your system is 4kb:
75 $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES = 0; # pages (default)
77 $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES = 4; # convert to kilobytes
78 $Sys::Statistics::Linux::Processes::PAGES_TO_BYTES = 4096; # convert to bytes
79 # or with
81 Sys::Statistics::Linux::Processes->new(pages_to_bytes => 4096);
82
84 new()
85 Call "new()" to create a new object.
86 my $lxs = Sys::Statistics::Linux::Processes->new;
88 It's possible to handoff an array reference with a PID list.
90 my $lxs = Sys::Statistics::Linux::Processes->new(pids => [ 1, 2, 3 ]);
92 It's also possible to set the path to the proc filesystem.
94 Sys::Statistics::Linux::Processes->new(
96 files => {
97 # This is the default
98 path => '/proc',
99 uptime => 'uptime',
100 stat => 'stat',
101 statm => 'statm',
102 status => 'status',
103 cmdline => 'cmdline',
104 wchan => 'wchan',
105 fd => 'fd',
106 }
107 );
108 init()
110 Call "init()" to initialize the statistics.
111 $lxs->init;
113 get()
115 Call "get()" to get the statistics. "get()" returns the statistics as a
116 hash reference.
117 my $stat = $lxs->get;
119 Note:
121 Processes that were created between the call of init() and get() are
123 returned as well, but the keys minflt, cminflt, mayflt, cmayflt, utime,
124 stime, cutime, and cstime are set to the value 0.00 because there are
125 no inititial values to calculate the deltas.
126 raw()
128 Get raw values.
129
131 No exports.
132
134 proc(5)
135 perldoc -f getpwuid
137
139 Please report all bugs to <jschulz.cpan(at)bloonix.de>.
140
142 Jonny Schulz <jschulz.cpan(at)bloonix.de>.
143
145 Copyright (c) 2006, 2007 by Jonny Schulz. All rights reserved.
146 This program is free software; you can redistribute it and/or modify it
148 under the same terms as Perl itself.
149perl v5.12.2 2010-12-1S4ys::Statistics::Linux::Processes(3)