Peak memory usage of a linux/unix process
Is there a tool that will run a command-line and report how much RAM was used total?
I'm imagining something analogous to /usr/bin/time
(This is an already answered, old question.. but just for the record :)
I was inspired by Yang's script, and came up with this small tool, named memusg. I simply increased the sampling rate to 0.1 to handle much short living processes. Instead of monitoring a single process, I made it measure rss sum of the process group. (Yeah, I write lots of separate programs that work together) It currently works on Mac OS X and Linux. The usage had to be similar to that of time :
memusg ls -alR / >/dev/null
It only shows the peak for the moment, but I'm interested in slight extensions for recording other (rough) statistics.
It's good to have such simple tool for just taking a look before we start any serious profiling.
[ Edit : Works on Ubuntu 14.04: /usr/bin/time -v command Make sure to use the full path.]
Looks like /usr/bin/time does give you that info, if you pass -v (this is on Ubuntu 8.10). See, eg, Maximum resident set size below:
$ /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
Valgrind one-liner:
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
Note use of --pages-as-heap to measure all memory in a process. More info here: http://valgrind.org/docs/manual/ms-manual.html
链接地址: http://www.djcxy.com/p/63268.html上一篇: 技巧来管理R会话中的可用内存