linux系统下used内存被那个进程占用了?

关于used下的内存使用情况分析
 
1、来由
      开发同事反应本机没有做什么,内存就占用了11G,也不知道是什么进程占用了,为此我展开了used内存占用的分析,上数据图
      # free -m
                   total       used       free     shared    buffers     cached
      Mem:         32111      11316      20794          0        157       1396
      -/+ buffers/cache:       9762      22348
      Swap:         8047         64       7983
2、原因分析
      针对此问题,我及时查看哪个进程占用
      # ps aux | head -1; ps aux| sort -rnk 4 | head -10
      USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
      zabbix   22866  0.0  0.0  78244  1836 ?        S    Jan18   0:27 /usr/sbin/zabbix_agentd: listener #3 [waiting for connection]
      zabbix   22865  0.0  0.0  78244  1856 ?        S    Jan18   0:27 /usr/sbin/zabbix_agentd: listener #2 [waiting for connection]
      zabbix   22864  0.0  0.0  78244  1852 ?        S    Jan18   0:27 /usr/sbin/zabbix_agentd: listener #1 [waiting for connection]
      zabbix   22863  0.0  0.0  78120  1924 ?        S    Jan18   0:59 /usr/sbin/zabbix_agentd: collector [idle 1 sec]
      zabbix   22861  0.0  0.0  78120   768 ?        S    Jan18   0:00 /usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf
      USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
      rtkit     2855  0.0  0.0 168452   844 ?        SNl   2020   4:55 /usr/libexec/rtkit-daemon
      rpcuser   2212  0.0  0.0  23344   740 ?        Ss    2020   0:00 rpc.statd
      rpc       2092  0.0  0.0  18972   604 ?        Ss    2020   0:16 rpcbind
      root        99  0.0  0.0      0     0 ?        S     2020   0:00 [kintegrityd/9]
      但是没有找到问题点,继续
      查看/proc/meminfo文件时
      # cat /proc/meminfo  未启动java时     启动java后
      MemTotal:       32882392 kB         32882392 kB
      MemFree:        11152484 kB         9941460 kB
      Buffers:          174520 kB         175588 kB
      Cached:          1485864 kB         1508656 kB
      SwapCached:         5100 kB         5092 kB
      Active:         10906000 kB         12098640 kB
      Inactive:         845964 kB         859936 kB
      Active(anon):   10088872 kB         11271860 kB
      Inactive(anon):     4448 kB         4448 kB
      Active(file):     817128 kB         826780 kB
      Inactive(file):   841516 kB         855488 kB
      Unevictable:           0 kB
      Mlocked:               0 kB
      SwapTotal:       8241144 kB       8241144 kB
      SwapFree:        8174820 kB       8174828 kB
      Dirty:               980 kB       1472 kB
      Writeback:             0 kB
      AnonPages:      10090488 kB       11275588 kB
      Mapped:            35960 kB       35964 kB
      Shmem:              1600 kB       1600 kB
      Slab:            9708836 kB       9709656 kB
      SReclaimable:    8982448 kB       8982488 kB
      SUnreclaim:       726388 kB       727168 kB
      KernelStack:        5592 kB       5888 kB
      PageTables:        34344 kB       36660 kB
      NFS_Unstable:          0 kB
      Bounce:                0 kB
      WritebackTmp:          0 kB
      CommitLimit:    24682340 kB       24682340 kB
      Committed_AS:   21549588 kB       21577332 kB
      VmallocTotal:   34359738367 kB    34359738367 kB
      VmallocUsed:      200220 kB       200220 kB
      VmallocChunk:   34341972664 kB    34341972664 kB
      HardwareCorrupted:     0 kB
      AnonHugePages:   9539584 kB       10670080 kB
      HugePages_Total:       0
      HugePages_Free:        0
      HugePages_Rsvd:        0
      HugePages_Surp:        0
      Hugepagesize:       2048 kB      2048 kB
      DirectMap4k:       10240 kB      10240 kB
      DirectMap2M:    33544192 kB      33544192 kB
3、在网络上找原因
      自己分析不出问题点,网络上有很多人说slab来分配内存,但是我想知道slab中内存包括那些内容,很少的知识点,怎么办?
我找到一个工具,linux-fincore
      下载linux-fincore工具:
            #wget https://codeload.github.com/waleedmazhar/linux-ftools/zip/master
      安装步骤如下:
            #cd /opt
            #unzip -d linux-ftools-master.zip
            #cd linux-ftools-master
            #./configure --prefix=/usr/local/linux-ftools      #请确保安装gcc依赖包,无错误进行下一步
            #make 
            #make install
      添加环境变量:
            #mv /usr/local/ftools/bin/* /usr/local/bin/       
#linux-fincore --pages=false --summarize --only-cached * ![操作命令](https://img2020.cnblogs.com/blog/1612349/202101/1612349-20210121214904457-1764740405.png) 由于图片出不来,我直接贴上去吧

‘‘‘# linux-fincore --pages=false --summarize --only-cached *
filename size total_pages min_cached page cached_pages cached_size cached_perc


Could not mmap file: linux-ftools-master: No such device
netapp.txt 891,161 218 0 218 892,928 100.00

total cached size: 892,928‘‘‘

 
为了更好抓取内存中进程,我这边添加个脚本+定时任务来完成,提供开发需要的资料,
脚本为:
# cat fincore.sh
#!/bin/bash
. /etc/init.d/functions
PATH=/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.8.0_131/bin:/usr/java/jdk1.8.0_131/lib:/root/bin
echo $PATH
if [ ! -f /usr/local/bin/linux-fincore ];then
  echo "you haven‘t install linux-fincore."
  exit 1
fi
ps -e -o pid,rss|sort -rnk 2  | head -10 | awk ‘{print $1}‘ > /tmp/cache.pid
if [ -f /tmp/cache.log ];then
   echo "the cache.files is exist,removing now"
   rm -f /tmp/cache.log
fi
while read line
do
  lsof -p $line 2>/dev/null  | awk ‘{print $9}‘ >>/tmp/cache.log
done > /tmp/cache.fincore
   fi
done
linux-fincore -s `cat /tmp/cache.fincore`
rm -f /tmp/cache.{pid,log,fincore}
测试一下脚本使用
#/bin/bash fincore.sh > 2.log
#查看日志中分析的数据
/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.8.0_131/bin:/usr/java/jdk1.8.0_131/lib:/root/bin
filename                                                                                       size        total_pages    min_cached page       cached_pages        cached_size        cached_perc
--------                                                                                       ----        -----------    ---------------       ------------        -----------        -----------
/weaver/jdk1.8.0_131/bin/java                                                                 7,734                  2                  0                  1              4,096              50.00
/lib64/libuuid.so.1.3.0                                                                      18,936                  5                  0                  5             20,480             100.00
/usr/lib64/libstdc++.so.6.0.13                                                              989,840                242                  0                109            446,464              45.04
/usr/lib64/libsapjco3.so                                                                  5,407,699              1,321                  0                500          2,048,000              37.85
/weaver/ecology/WEB-INF/lib/ehcache-2.8.3.jar                                             5,637,564              1,377                  0                454          1,859,584              32.97
这边我只保留部分数据,
这时,脚本已启作用了,现在只需要添加定时任务让它自动运行并输出日志给到系统了,方便他们及时查看。

linux系统下used内存被那个进程占用了?

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