linux线程内存占用率测试

linux内核下开一个while(1)死循环线程，top命令观察内存占用率

Mem: 605060K used, 1428360K free, 0K shrd, 0K buff, 150044K cached

CPU:  0.0% usr 25.4% sys  0.0% nic 74.4% idle  0.0% io  0.0% irq  0.0% sirq

Load average: 10.70 9.02 7.85 6/119 5261

  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND

 4997     2 root     RW       0  0.0   0  0.6 [indxd]

    9     2 root     SW       0  0.0   2  0.0 [rcu_sched]

 4989     2 root     DW       0  0.0   2  0.0 [ge_sw_d]

 5164     1 root     S    1124m 56.4   2  0.0 ./a_server

 5146     1 root     S     852m 42.8   0  0.0 drvBaMc

 5076     1 root     S     7720  0.3   2  0.0 /usr/local/WebServer/apache/bin/ht

 5082  5076 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 5083  5076 root     S     7720  0.3   2  0.0 /usr/local/WebServer/apache/bin/ht

 5084  5076 root     S     7720  0.3   3  0.0 /usr/local/WebServer/apache/bin/ht

 5085  5076 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 5086  5076 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 1586     1 root     S     5800  0.2   3  0.0 tftpserver -l var/log/tftp.log

 5080  5078 root     S     4964  0.2   0  0.0 /usr/local/WebServer/apache/bin/ro

 5081  5079 root     S     4964  0.2   3  0.0 /usr/local/WebServer/apache/bin/ro

 5092     1 root     S     4912  0.2   2  0.0 /usr/local/bin/adaemon /usr/local/

 1355     1 root     S     4704  0.2   0  0.0 telnetd

 1587     1 root     S     4104  0.2   2  0.0 -/bin/sh

 2182  1355 root     S     4104  0.2   3  0.0 -sh

 5127  1587 root     R     4100  0.2   0  0.0 top

 1341     1 root     S     4040  0.2   2  0.0 klogd -c 8

linux内核下开一个msleep(2000)延时2000ms循环线程，top命令观察内存占用率

###msleep（2000）

Mem: 521512K used, 1511908K free, 0K shrd, 0K buff, 77788K cached

CPU:  0.0% usr  0.9% sys  0.0% nic 99.1% idle  0.0% io  0.0% irq  0.0% sirq

Load average: 7.68 4.49 1.88 1/99 2349

  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND

 2215     2 root     DW       0  0.0   1  0.5 [indxd]

 2320     2 root     DW       0  0.0   0  0.1 [set-speed-disp]

 2233     1 root     S     852m 42.8   2  0.0 drvBaMc

 1098     2 root     SW       0  0.0   0  0.0 [kworker/0:1]

 2207     2 root     DW       0  0.0   2  0.0 [ge_sw_d]

 1733     2 root     SW       0  0.0   3  0.0 [kworker/u8:2]

 2294     1 root     S     7720  0.3   2  0.0 /usr/local/WebServer/apache/bin/ht

 2300  2294 root     S     7720  0.3   0  0.0 /usr/local/WebServer/apache/bin/ht

 2301  2294 root     S     7720  0.3   2  0.0 /usr/local/WebServer/apache/bin/ht

 2302  2294 root     S     7720  0.3   3  0.0 /usr/local/WebServer/apache/bin/ht

 2303  2294 root     S     7720  0.3   0  0.0 /usr/local/WebServer/apache/bin/ht

 2304  2294 root     S     7720  0.3   0  0.0 /usr/local/WebServer/apache/bin/ht

 1586     1 root     S     5800  0.2   2  0.0 tftpserver -l var/log/tftp.log

 2298  2296 root     S     4964  0.2   1  0.0 /usr/local/WebServer/apache/bin/ro

 2299  2297 root     S     4964  0.2   3  0.0 /usr/local/WebServer/apache/bin/ro

 2310     1 root     S     4912  0.2   1  0.0 /usr/local/bin/adaemon /usr/local/

 1355     1 root     S     4704  0.2   0  0.0 telnetd

 1587     1 root     S     4104  0.2   3  0.0 -/bin/sh

 1613  1355 root     S     4104  0.2   2  0.0 -sh

 2343  1587 root     R     4100  0.2   0  0.0 top

linux内核下开一个msleep(1)延时2000ms循环线程，top命令观察内存占用率

###msleep（1）

Mem: 521556K used, 1511864K free, 0K shrd, 0K buff, 77660K cached

CPU:  0.1% usr  3.4% sys  0.0% nic 96.4% idle  0.0% io  0.0% irq  0.0% sirq

Load average: 7.54 3.66 1.43 1/99 2023

  PID  PPID USER     STAT   VSZ %MEM CPU %CPU COMMAND

 1993     2 root     DW       0  0.0   0  2.7 [set-speed-disp]

 1888     2 root     DW       0  0.0   2  0.4 [indxd]

 1098     2 root     SW       0  0.0   0  0.1 [kworker/0:1]

    9     2 root     SW       0  0.0   0  0.1 [rcu_sched]

 1996  1587 root     R     4100  0.2   0  0.0 top

 1880     2 root     DW       0  0.0   1  0.0 [ge_sw_d]

 1906     1 root     S     852m 42.8   2  0.0 drvBaMc

 1967     1 root     S     7720  0.3   3  0.0 /usr/local/WebServer/apache/bin/ht

 1973  1967 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 1974  1967 root     S     7720  0.3   3  0.0 /usr/local/WebServer/apache/bin/ht

 1975  1967 root     S     7720  0.3   0  0.0 /usr/local/WebServer/apache/bin/ht

 1976  1967 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 1977  1967 root     S     7720  0.3   1  0.0 /usr/local/WebServer/apache/bin/ht

 1586     1 root     S     5800  0.2   2  0.0 tftpserver -l var/log/tftp.log

 1971  1969 root     S     4964  0.2   2  0.0 /usr/local/WebServer/apache/bin/ro

 1972  1970 root     S     4964  0.2   0  0.0 /usr/local/WebServer/apache/bin/ro

 1983     1 root     S     4912  0.2   2  0.0 /usr/local/bin/adaemon /usr/local/

 1355     1 root     S     4704  0.2   0  0.0 telnetd

 1587     1 root     S     4104  0.2   3  0.0 -/bin/sh

 1613  1355 root     S     4104  0.2   1  0.0 -sh

结论：1、不延时，死循环下，CPU占用率满，内存占用多了82MB，高速缓存使用量几乎翻倍，多了70MB

            2、 随着延时时间缩短，CPU占用率增加，内存占用率有所下降，但不明显，高速缓存使用量有所下降，但不明显