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内存使用命令，语法与时间命令类似

tag-icon • tag-icon memory time command
内存使用命令，语法与时间命令类似

什么命令显示程序的内存使用情况，我正在寻找一个易于使用且与该time命令具有相似语法的命令。我正在尝试查找用 C 编写的 md5 哈希程序的内存使用情况，该程序需要 7 秒来哈希“hello world”。

我使用的是安装了 busybox 的 android 操作系统。

答案1

讽刺的是，time可能会给你一个答案，但这次它不应该是 shell 内置的time，而是独立的：

$ /usr/bin/time -v uname
Linux
        Command being timed: "uname"
        User time (seconds): 0.00
        System time (seconds): 0.00
        Percent of CPU this job got: 2%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.12
        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): 896
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 1
        Minor (reclaiming a frame) page faults: 304
        Voluntary context switches: 3
        Involuntary context switches: 3
        Swaps: 0
        File system inputs: 56
        File system outputs: 0
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

不过它计算的是 MAX RSS，而不是 VSS，所以它对您是否有用很大程度上取决于您的任务。

UPD。:Mac OS X’“认为”略有不同，但仍然是time：

/usr/bin/time -l /Applications/Opera.app/Contents/MacOS/Opera
      244.63 real        54.34 user        26.44 sys
 284827648  maximum resident set size
         0  average shared memory size
         0  average unshared data size
         0  average unshared stack size
    711407  page reclaims
      1272  page faults
         0  swaps
       155  block input operations
       251  block output operations
     98542  messages sent
     68330  messages received
        16  signals received
       699  voluntary context switches
    468999  involuntary context switches

答案2

您可以使用valgrind为了这：

$ valgrind myprogram arg1 arg2

它的输出将有很多不相关的东西，但它的堆摘要可以满足您的要求：

==91383== HEAP SUMMARY:
==91383==     in use at exit: 157,643 bytes in 364 blocks
==91383==   total heap usage: 2,999 allocs, 2,635 frees, 306,450 bytes allocated

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