Linux性能测试 pmap命令详解

名称：

pmap – report memory map of a process(查看进程的内存映像信息)

用法    

pmap [ -x | -d ] [ -q ] pids… pmap -V

选项含义

-x extended Show the extended format. 显示扩展格式 -d device Show the device format. 显示设备格式 -q quiet Do not display some header/footer lines. 不显示头尾行 -V show version Displays version of program. 显示版本

扩展格式和设备格式域：

Address: start address of map 映像起始地址 Kbytes: size of map in kilobytes 映像大小 RSS: resident set size in kilobytes 驻留集大小 Dirty: dirty pages (both shared and private) in kilobytes 脏页大小 Mode: permissions on map 映像权限: r=read, w=write, x=execute, s=shared, p=private (copy on write) Mapping: file backing the map , or [ anon ] for allocated memory, or [ stack ] for the program stack. 映像支持文件,[anon]为已分配内存 [stack]为程序堆栈 Offset: offset into the file 文件偏移 Device: device name (major:minor) 设备名

举例：

查看进程1的设备格式

[root@C44 ~]# pmap -d 1 1: init [5] Address Kbytes Mode Offset Device Mapping 00934000 88 r-x– 0000000000000000 008:00005 ld-2.3.4.so 0094a000 4 r—- 0000000000015000 008:00005 ld-2.3.4.so 0094b000 4 rw— 0000000000016000 008:00005 ld-2.3.4.so 0094e000 1188 r-x– 0000000000000000 008:00005 libc-2.3.4.so 00a77000 8 r—- 0000000000129000 008:00005 libc-2.3.4.so 00a79000 8 rw— 000000000012b000 008:00005 libc-2.3.4.so 00a7b000 8 rw— 0000000000a7b000 000:00000 [ anon ] 00a85000 52 r-x– 0000000000000000 008:00005 libsepol.so.1 00a92000 4 rw— 000000000000c000 008:00005 libsepol.so.1 00a93000 32 rw— 0000000000a93000 000:00000 [ anon ] 00d9d000 52 r-x– 0000000000000000 008:00005 libselinux.so.1 00daa000 4 rw— 000000000000d000 008:00005 libselinux.so.1 08048000 28 r-x– 0000000000000000 008:00005 init 0804f000 4 rw— 0000000000007000 008:00005 init 084e1000 132 rw— 00000000084e1000 000:00000 [ anon ] b7f5d000 8 rw— 00000000b7f5d000 000:00000 [ anon ] bffee000 72 rw— 00000000bffee000 000:00000 [ stack ] ffffe000 4 —– 0000000000000000 000:00000 [ anon ] mapped: 1700K writeable/private: 276K shared: 0K [root@C44 ~]#

最后一行的值

mapped 表示该进程映射的虚拟地址空间大小，也就是该进程预先分配的虚拟内存大小，即ps出的vsz

writeable/private  表示进程所占用的私有地址空间大小，也就是该进程实际使用的内存大小

shared 表示进程和其他进程共享的内存大小

查看进程1的设备格式，不显示头尾行

[root@C44 ~]# pmap -d -q 1 1: init [5] 00934000 88 r-x– 0000000000000000 008:00005 ld-2.3.4.so 0094a000 4 r—- 0000000000015000 008:00005 ld-2.3.4.so 0094b000 4 rw— 0000000000016000 008:00005 ld-2.3.4.so 0094e000 1188 r-x– 0000000000000000 008:00005 libc-2.3.4.so 00a77000 8 r—- 0000000000129000 008:00005 libc-2.3.4.so 00a79000 8 rw— 000000000012b000 008:00005 libc-2.3.4.so 00a7b000 8 rw— 0000000000a7b000 000:00000 [ anon ] 00a85000 52 r-x– 0000000000000000 008:00005 libsepol.so.1 00a92000 4 rw— 000000000000c000 008:00005 libsepol.so.1 00a93000 32 rw— 0000000000a93000 000:00000 [ anon ] 00d9d000 52 r-x– 0000000000000000 008:00005 libselinux.so.1 00daa000 4 rw— 000000000000d000 008:00005 libselinux.so.1 08048000 28 r-x– 0000000000000000 008:00005 init 0804f000 4 rw— 0000000000007000 008:00005 init 084e1000 132 rw— 00000000084e1000 000:00000 [ anon ] b7f5d000 8 rw— 00000000b7f5d000 000:00000 [ anon ] bffee000 72 rw— 00000000bffee000 000:00000 [ stack ] ffffe000 4 —– 0000000000000000 000:00000 [ anon ] [root@C44 ~]#

查看进程1的扩展格式

[root@C44 ~]# pmap -x 1 1: init [5] Address Kbytes RSS Anon Locked Mode Mapping 00934000 88 – – – r-x– ld-2.3.4.so 0094a000 4 – – – r—- ld-2.3.4.so 0094b000 4 – – – rw— ld-2.3.4.so 0094e000 1188 – – – r-x– libc-2.3.4.so 00a77000 8 – – – r—- libc-2.3.4.so 00a79000 8 – – – rw— libc-2.3.4.so 00a7b000 8 – – – rw— [ anon ] 00a85000 52 – – – r-x– libsepol.so.1 00a92000 4 – – – rw— libsepol.so.1 00a93000 32 – – – rw— [ anon ] 00d9d000 52 – – – r-x– libselinux.so.1 00daa000 4 – – – rw— libselinux.so.1 08048000 28 – – – r-x– init 0804f000 4 – – – rw— init 084e1000 132 – – – rw— [ anon ] b7f5d000 8 – – – rw— [ anon ] bffee000 72 – – – rw— [ stack ] ffffe000 4 – – – —– [ anon ] ——– ——- ——- ——- ——- total kB 1700 – – – [root@C44 ~]#

循环显示进程3066的设备格式的最后1行，间隔2秒，

[root@C44 ~]# while true; do pmap -d 3066 | tail -1; sleep 2; done mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K mapped: 5412K writeable/private: 2028K shared: 0K

 总结

以上所述是小编给大家介绍的Linux性能测试 pmap命令详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对免费资源网网站的支持！