重新发明轮子，用手工制作bash脚本。快速干净。

我的用例:我想监控一台RAM较少的linux机器，并想在它运行在大量使用时获取每个容器使用情况的快照。

#!/usr/bin/env bash

threshold=$1

echo "$(date '+%Y-%m-%d %H:%M:%S'): Running free memory monitor with threshold $threshold%.."

while(true)
    freePercent=`free -m | grep Mem: | awk '{print ($7/$2)*100}'`    
  do

  if (( $(awk 'BEGIN {print ("'$freePercent'" < "'$threshold'")}') ))
  then
       echo "$(date '+%Y-%m-%d %H:%M:%S'): Free memory $freePercent% is less than $threshold%"
       free -m
       docker stats --no-stream
       sleep 60  
       echo ""  
  else
       echo "$(date '+%Y-%m-%d %H:%M:%S'): Sufficient free memory available: $freePercent%"
  fi
  sleep 30

done

样例输出:

2017-10-12 13:29:33:使用阈值30%运行空闲内存监视器。 2017-10-12 13:29:33:可用空闲内存充足:69.4567% 2017-10-12 13:30:03:可用空闲内存充足:69.4567% 2017-10-12 16:47:02:空闲内存18.9387%小于30% 您的定制命令输出

你可以使用Valgrind这样的工具来做到这一点。

Valgrind一行程序:

Valgrind——tool=massif——pages-as-heap=yes——massif-out-file=massif。出去。/ test.sh;grep mem_heap_B massif。出| sed - e ' s / mem_heap_B = \(. * \) / \ 1 /“| - g | tail - n 1

注意使用——pages-as-heap来测量进程中的所有内存。更多信息请访问:http://valgrind.org/docs/manual/ms-manual.html

这将大大降低您的命令速度。

time -f '%M' <run_program>

[编辑:适用于Ubuntu 14.04: /usr/bin/time -v命令确保使用完整路径。]

看起来/usr/bin/time确实给了你这个信息，如果你输入-v(这是在Ubuntu 8.10上)。例如，参见下面的最大常驻集大小:

$ /usr/bin/time -v ls /
....
        Command being timed: "ls /"
        User time (seconds): 0.00
        System time (seconds): 0.01
        Percent of CPU this job got: 250%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.00
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 0
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 315
        Voluntary context switches: 2
        Involuntary context switches: 0
        Swaps: 0
        File system inputs: 0
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

请务必回答这个问题。提供详细信息并分享您的研究!

对不起，我是第一次来这里，只能问问题。

使用建议:

valgrind --tool=massif --pages-as-heap=yes --massif-out-file=massif.out ./test.sh; grep mem_heap_B massif.out | sed -e 's/mem_heap_B=\(.*\)/\1/' | sort -g | tail -n 1

然后:

grep mem_heap_B massif.out
...
mem_heap_B=1150976
mem_heap_B=1150976
...

这与顶部命令在相同时刻所显示的非常不同:

14673 gu27mox   20   0 3280404 468380  19176 R 100.0  2.9   6:08.84 pwanew_3pic_com

Valgrind的测量单位是什么??

/usr/bin/time -v ./test.sh从来没有回答-你必须直接将可执行文件提供给/usr/bin/time:

/usr/bin/time -v  pwanew_3pic_compass_2008florian3_dfunc.static  card_0.100-0.141_31212_resubmit1.dat_1.140_1.180   1.140 1.180 31212


    Command being timed: "pwanew_3pic_compass_2008florian3_dfunc.static card_0.100-0.141_31212_resubmit1.dat_1.140_1.180 1.140 1.180 31212"

    User time (seconds): 1468.44
    System time (seconds): 7.37
    Percent of CPU this job got: 99%
    Elapsed (wall clock) time (h:mm:ss or m:ss): 24:37.14
    Average shared text size (kbytes): 0
    Average unshared data size (kbytes): 0
    Average stack size (kbytes): 0
    Average total size (kbytes): 0
    Maximum resident set size (kbytes): 574844
    Average resident set size (kbytes): 0
    Major (requiring I/O) page faults: 74
    Minor (reclaiming a frame) page faults: 468880
    Voluntary context switches: 1190
    Involuntary context switches: 20534
    Swaps: 0
    File system inputs: 81128
    File system outputs: 1264
    Socket messages sent: 0
    Socket messages received: 0
    Signals delivered: 0
    Page size (bytes): 4096
    Exit status: 0