我正在用C编写一个小程序,我想测量它的性能。
我想看看它在处理器中运行了多少时间,以及有多少缓存命中+未命中。有关上下文切换和内存使用情况的信息也很好。
该程序不到一秒钟即可执行。
我喜欢/ proc / [pid] / stat的信息,但是我不知道如何在程序死亡/死亡后看到它。
有任何想法吗?
编辑:我认为Valgrind增加了很多开销。这就是为什么我想要一个简单的工具,比如/ proc / [pid] / stat,它总是在那里。
发布于 2018-05-28 16:26:39
使用perf:
perf stat ./yourapp
来自wiki的示例:
perf stat -B dd if=/dev/zero of=/dev/null count=1000000
Performance counter stats for 'dd if=/dev/zero of=/dev/null count=1000000':
5,099 cache-misses # 0.005 M/sec (scaled from 66.58%)
235,384 cache-references # 0.246 M/sec (scaled from 66.56%)
9,281,660 branch-misses # 3.858 % (scaled from 33.50%)
240,609,766 branches # 251.559 M/sec (scaled from 33.66%)
1,403,561,257 instructions # 0.679 IPC (scaled from 50.23%)
2,066,201,729 cycles # 2160.227 M/sec (scaled from 66.67%)
217 page-faults # 0.000 M/sec
3 CPU-migrations # 0.000 M/sec
83 context-switches # 0.000 M/sec
956.474238 task-clock-msecs # 0.999 CPUs
0.957617512 seconds time elapsed
发布于 2018-05-28 16:57:59
你也可以使用
/usr/bin/time -v YourProgram.exe
它会告诉你所有这些信息:
/usr/bin/time -v ls
Command being timed: "ls"
User time (seconds): 0.00
System time (seconds): 0.00
Percent of CPU this job got: 60%
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): 4080
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 314
Voluntary context switches: 1
Involuntary context switches: 1
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
https://stackoverflow.com/questions/-100001370
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