http://www.cnblogs.com/tibetanmastiff/archive/2011/10/10/2205799.html
情景：
根据apache的工作方式，当我们要判断某个httpd进程使用内存的详细情况的时候，就用到了pmap命令：
例如：
1.查看pmap如何使用：
[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
Albert Cahalan <albert@users.sf.net> wrote pmap in 2002, and
is the cur-
rent maintainer of the procps collection. Please send bug reports to
<procps-feedback@lists.sf.net>.
Linux October 26, 2002 PMAP(1)
(END)
2.参数说明：
-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.举例：
查看系统进程：
[root@CentOS5 ~]#ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME
COMMAND
root 1 0.0 0.0 2072 616 ? Ss May17 0:01
init [3]
（中间部分略）
daemon 9639 0.0 0.1 21164 8484 ? S 13:11 0:00
/usr/local/apache2/bin/httpd
（下面部分略）
[root@CentOS5 ~]#pmap -d 9639
9639: /usr/local/apache2/bin/httpd -k start
Address Kbytes Mode Offset Device Mapping
00110000 28 r-x-- 0000000000000000 008:00003 librt-2.5.so
00117000 4 r---- 0000000000006000 008:00003 librt-2.5.so
00118000 4 rw--- 0000000000007000 008:00003 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 008:00003 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--- 000000000000e000 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 008:00003 libnsl-2.5.so
0038a000 4 rw--- 0000000000013000 008:00003 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 008:00003 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 008:00003 libkeyutils-1.2.so
004e3000 36 r-x-- 0000000000000000 008:00003 libnss_files-2.5.so
004ec000 4 r---- 0000000000008000 008:00003 libnss_files-2.5.so
004ed000 4 rw--- 0000000000009000 008:00003 libnss_files-2.5.so
004f4000