Process memory usage on OSX using GNU time

process_memory_usage_osx.sh

# On Linux we can use native GNU time, on OSX we have to install gnu-time
# manually, since native time doesn't measure memory.

# http://man7.org/linux/man-pages/man1/time.1.html
# http://braumeister.org/formula/gnu-time
$ brew install gnu-time

# can be called via gtime, since time is a bash command

# %M - Maximum resident set size of the process during its lifetime, in Kbytes.
# Actually it is in bytes, not kilobytes!!

# http://stackoverflow.com/questions/22732932/how-to-get-the-max-memory-usage-of-a-program-using-psutil-in-python

# usage:
$ gtime -f %M some_command arg1 arg2 ...
$ gtime --verbose some_command arg1 arg2 ...

# example - just memory:
$ gtime -f %M python --version
Python 3.4.5
6602752

# example - full info
$ gtime --verbose python --version
Python 3.4.5
	Command being timed: "python --version"
	User time (seconds): 0.00
	System time (seconds): 0.00
	Percent of CPU this job got: 33%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.01
	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): 6569984
	Average resident set size (kbytes): 0
	Major (requiring I/O) page faults: 106
	Minor (reclaiming a frame) page faults: 420
	Voluntary context switches: 6
	Involuntary context switches: 28
	Swaps: 0
	File system inputs: 4
	File system outputs: 0
	Socket messages sent: 0
	Socket messages received: 0
	Signals delivered: 0
	Page size (bytes): 4096
	Exit status: 0