Linux: pmap command to view the memory occupied by the process and the address space used

Http://www.cnblogs.com/tibetanmastiff/archive/2011/10/10/2205799.html

 

 

Scenario:

According to Apache's working method, the pmap command is used to determine the memory usage details of an httpd process:

 

For example:

1. view how to use pmap:

[Root @ centos5 ~] # Man pmap

Pmap (1)                     Linux User's Manual                    Pmap (1)

Name
      Pmap-Report memory map of a process

Synopsis
      Pmap [-x |-D] [-q] PIDs...
      Pmap-V

Description
      The pmap Command reports the memory map of a process or processes.

General options
      -X Extended     Show the extended format.
      -D Device       Show the device format.
      -Q Quiet        Do not display some Header/footer lines.
      -V Show version Displays version of program.

See also
      PS (1) pgrep (1)

Standards
      No standards apply, but pmap looks an awful lot like a SunOS command.

Author
      AlbertCahalan<Albert@users.sf.net> wrote pmap in 2002, and
Is the cur-
      Rent Maintainer of the procpsCollection.PleaseSendBugReportsTo
      <Procps-feedback@lists.sf.net>.

Linux                        October 26,200 2                      Pmap (1)
(End)

2. parameter description:

      -X Extended     Show the extended format.
      -D Device       Show the device format.
      -Q Quiet        Do not display some Header/footer lines.
      -V Show version Displays version of program.

 

3. Example:

View system processes:

[Root @ centos5 ~] # Ps aux

User     PID % CPU % mem  Vsz RSS tty    Stat start Time
Command
Root       10.00.0 2072 616?      SS May17 0: 01
Init [3]
(Omitted in the middle)

Daemon  96390.00.1211648484?      S   0: 00
/Usr/local/apache2/bin/httpd

(The following section is omitted)

 

[Root @ centos5 ~] # Pmap-D 9639
9639: /Usr/local/apache2/bin/httpd-K start
Address Kbytes ModeOffset         Device  Mapping
00110000    28 R-X -- 0000000000000000 008:00003 librt-2.5.so
00117000     4 R ---- 0000000000006000 librt-2.5.so
00118000     4 RW --- 0000000000007000 librt-2.5.so
00119000  1276 R-X -- 0000000000000000 008:00003 libc-2.5.so
00258000     8 R ---- 000000000013f000 008:00003 libc-2.5.so
0025a000     4 RW --- 0000000000141000 libc-2.5.so
0025b000    12 RW --- 000000000025b000 000:00000 [Anon]
0025e000    60 r-X -- 0000000000000000 008:00003 libexslt. so.0.8.12
0026d000     4 RW --- zookeeper e000 008:00003 libexslt. so.0.8.12
0026e000   268 R-X -- 0000000000000000 008:00003 libmysqlclient. so.16.0.0
002b1000   168 RW --- 0000000000042000 008:00003 libmysqlclient. so.16.0.0
002db000     4 RW --- 00000000002db000 000:00000 [Anon]
002dc000   448 R-X -- 0000000000000000 008:00003 libfreetype. so.6.4.0
0034c000    16 RW --- 000000000006f000 008:00003 libfreetype. so.6.4.0
00350000    72 R-X -- 0000000000000000 008:00003 libz. so.1.2.3
00362000     4 RW --- 0000000000011000 008:00003 libz. so.1.2.3
00363000    60 r-X -- 0000000000000000 008:00003 libresolv-2.5.so
00372000     4 R ---- 000000000000e000 008:00003 libresolv-2.5.so
00373000     4 RW --- 000000000000f000 008:00003 libresolv-2.5.so
00374000     8 RW --- 0000000000374000 000:00000 [Anon]
00376000    76 R-X -- 0000000000000000 008:00003 libnsl-2.5.so
00389000     4 R ---- 0000000000012000 libnsl-2.5.so
0038a000     4 RW --- 0000000000013000 libnsl-2.5.so
0038b000     8 RW --- 000000000038b000 000:00000 [Anon]
0038d000   200 r-X -- 0000000000000000 008:00003 libcurl. so.3.0.0
003bf000     4 RW --- 0000000000031000 libcurl. so.3.0.0
003c0000   192 R-X -- 0000000000000000 008:00003 libidn. so.11.5.19
003f0000     4 RW --- 000000000002f000 008:00003 libidn. so.11.5.19
003f1000   188 R-X -- 0000000000000000 008:00003 libxslt. so.1.1.15
00420000     4 RW --- 000000000002f000 008:00003 libxslt. so.1.1.15
00421000   588 R-X -- 0000000000000000 008:00003 libkrb5.so. 3.3
004b4000    12 RW --- 0000000000092000 008:00003 libkrb5.so. 3.3
004b7000     8 R-X -- 0000000000000000 008:00003 libcom_err.so.2.1
004b9000     4 RW --- 0000000000001000 008:00003 libcom_err.so.2.1
004ba000   148 R-X -- 0000000000000000 008:00003 libk5crypto. so.3.1
004df000     4 RW --- 0000000000025000 008:00003 libk5crypto. so.3.1
004e0000     8 R-X -- 0000000000000000 008:00003 libkeyutils-1.2.so
004e2000     4 RW --- 0000000000001000 libkeyutils-1.2.so
004e3000    36 R-X -- 0000000000000000 008:00003 libnss_files-2.5.so
004ec000     4 R ---- 0000000000008000 libnss_files-2.5.so
004ed000     4 RW --- 0000000000009000 libnss_files-2.5.so
004f4000