linux的top命令分析问题

今天发生数据库查询返回一半的json数据，之前以为设置c3p0的maxIdleTime为大值会解决问题，没想到问题依旧存在。

用top命令分析一下java内存:

 

[[email protected]_101 bin]$ top

top - 15:58:38 up 66 days,  6:07,  2 users,  load average: 0.00, 0.00, 0.00

Tasks: 119 total,   1 running, 118 sleeping,   0 stopped,   0 zombie

Cpu(s):  0.3%us,  0.2%sy,  0.0%ni, 99.5%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Mem:   3924684k total,  1378960k used,  2545724k free,   169944k buffers

Swap:  4194296k total,    23792k used,  4170504k free,   343196k cached

PID    USER    PR  NI  VIRT   RES   SHR S %cpu %mem TIME+  COMMAND

 1661 mysql     20   0 1178m 117m 3456 S  0.3    3.1     70:42.33   mysqld

24483 101       20   0 2237m 534m  12m S  0.3    13.9    1:00.40      java

24531 101       20   0 15028  1324  1004   R   0.3       0.0       0:01.20      top

    1     root      20   0 19232  1348   1192    S    0.0        0.0        0:01.12      init

 

 

从分析得出，系统内存足够多，java进程VIRT 2237m虚拟内存，VIRT=SWAP+RES , 闲置虚拟内存还有534m 。

SHR表示共享内存大小，12m。从这些判断java虚拟机不存在，内存使用率占13.9%，不存在内存不够的情况。

分析mysql 虚拟内存总大小为1178m,闲置虚拟内存117.共共享内存3456。内存使用率占3.1%,不存在内存不够的情况。

 

还爆出如下异常：

[org.springframework.web.servlet.DispatcherServlet]DispatcherServlet with name 'springMvc' processing GET request for [/nstatsback/101admin/teaching/teaching.do]
[org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping]Mapping [/101admin/teaching/teaching.do] to HandlerExecutionChain with handler [[email protected]] and 1 interceptor
[org.springframework.web.servlet.DispatcherServlet]Last-Modified value for [/nstatsback/101admin/teaching/teaching.do] is: -1
[org.springframework.web.bind.annotation.support.HandlerMethodInvoker]Invoking request handler method: public void com.chinaedu.nstats.controller.NStatsController.teaching(java.lang.String,java.lang.String,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) throws java.io.IOException
java.lang.NullPointerException
[org.springframework.jdbc.datasource.DataSourceUtils]Fetching JDBC Connection from DataSource
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 7, excluded: 0] (e.g. com.mchan                                                                                                 [email protected])
[org.springframework.jdbc.datasource.DataSourceUtils]Returning JDBC Connection to DataSource
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 7, excluded: 0] (e.g. [email protected])
[org.springframework.jdbc.datasource.DataSourceUtils]Fetching JDBC Connection from DataSource
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 7, excluded: 0] (e.g. [email protected])
[org.springframework.jdbc.datasource.DataSourceUtils]Returning JDBC Connection to DataSource
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 7, excluded: 0] (e.g. [email protected])
[com.mchange.v2.c3p0.impl.NewProxyConnection][email protected]: close() called more than once.
[org.springframework.web.servlet.DispatcherServlet]Null ModelAndView returned toDispatcherServlet with name 'springMvc': assuming HandlerAdapter completed request handling
[org.springframework.web.servlet.DispatcherServlet]Successfully completed request
[com.mchange.v2.resourcepool.BasicResourcePool]Refurbishing idle resources - Mon May 04 16:16:30 CST 2015 [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 8, excluded: 0] (e.g. [email protected])
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.resourcepool.BasicResourcePool]Refurbishing idle resources - Mon May 04 16:17:30 CST 2015 [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 8, excluded: 0] (e.g. [email protected])
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
loginFilter end
update gm_login_log  SET user_id =?,  u_num =?,  ip =?,  class_id =?,  semester_code =?,  login_time =?,  school_id =?,  create_time =?,  create_user =?,  modify_time =?,  modify_user =?,  delete_flag =?,  school_code =?,   check_time =?,  stay_time =?, role_code =?  where id=?
[com.mchange.v2.resourcepool.BasicResourcePool]Checking for expired resources - Mon May 04 16:18:00 CST 2015 [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]BEGIN check for expired resources.  [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]FINISHED check for expired resources.  [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]Refurbishing idle resources - Mon May 04 16:18:30 CST 2015 [[email protected]]
[com.mchange.v2.resourcepool.BasicResourcePool]trace [email protected] [managed: 8, unused: 8, excluded: 0] (e.g. [email protected])
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Testing PooledConnection [[email protected]] on IDLE CHECK.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.
[com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool]Test of PooledConnection [[email protected]] on IDLE CHECK has SUCCEEDED.

更多linux top命令参考文章http://www.jb51.net/LINUXjishu/34604.html

 

 

Linux系统的物理cpu数、核数、逻辑cpu个数查看

 

# 总核数 = 物理CPU个数 X 每颗物理CPU的核数 
# 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数

# 查看物理CPU个数
cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

# 查看每个物理CPU中core的个数(即核数)
cat /proc/cpuinfo| grep "cpu cores"| uniq

# 查看逻辑CPU的个数
cat /proc/cpuinfo| grep "processor"| wc -l

# 查看CPU信息（型号）
cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c