Use psutil instead of various hacks

[jdemeyer]

The following modules can mostly replaced by simple calls to psutil:

• sage.misc.getusage
• sage.misc.memory_info
• sage.misc.darwin_utilities

All usage of these modules is replaced by some simple wrappers around psutil. These wrappers are implemented in sage.misc.getusage.

[jdemeyer]

New commits:

​46832bc

Use psutil instead of various hacks

[jpflori]

Looks goot to me.

[vbraun]

on OSX:

30617Traceback (most recent call last):
30618  File "/Users/buildslave-sage/slave/sage_git/build/src/bin/sage-eval", line 4, in <module>
30619    from sage.all import *
30620  File "/Users/buildslave-sage/slave/sage_git/build/local/lib/python2.7/site-packages/sage/all.py", line 92, in <module>
30621    from sage.misc.all       import *         # takes a while
30622  File "/Users/buildslave-sage/slave/sage_git/build/local/lib/python2.7/site-packages/sage/misc/all.py", line 89, in <module>
30623    from .functional import (additive_order,
30624  File "/Users/buildslave-sage/slave/sage_git/build/local/lib/python2.7/site-packages/sage/misc/functional.py", line 32, in <module>
30625    from sage.rings.complex_double import CDF
30626  File "sage/rings/integer.pxd", line 7, in init sage.rings.complex_double (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/rings/complex_double.c:23953)
30627  File "sage/rings/rational.pxd", line 8, in init sage.rings.integer (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/rings/integer.c:50744)
30628  File "sage/rings/fast_arith.pxd", line 3, in init sage.rings.rational (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/rings/rational.c:38499)
30629  File "sage/libs/cypari2/gen.pxd", line 5, in init sage.rings.fast_arith (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/rings/fast_arith.c:8557)
30630  File "/Users/buildslave-sage/slave/sage_git/build/local/lib/python2.7/site-packages/sage/libs/cypari2/__init__.py", line 1, in <module>
30631    from .pari_instance import pari
30632  File "sage/libs/cypari2/pari_instance.pyx", line 453, in init sage.libs.cypari2.pari_instance (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/libs/cypari2/pari_instance.c:17929)
30633  File "sage/libs/cypari2/pari_instance.pyx", line 517, in sage.libs.cypari2.pari_instance.PariInstance.__init__ (/Users/buildslave-sage/slave/sage_git/build/src/build/cythonized/sage/libs/cypari2/pari_instance.c:11439)
30634  File "/Users/buildslave-sage/slave/sage_git/build/local/lib/python2.7/site-packages/sage/misc/getusage.py", line 74, in virtual_memory_limit
30635    vmax = psutil.Process().rlimit(psutil.RLIMIT_AS)[0]
30636AttributeError: 'Process' object has no attribute 'rlimit'
30637Sage failed to start up.
30638Please email sage-devel (http://groups.google.com/group/sage-devel)
30639explaining the problem and send the log file
30640  /Users/buildslave-sage/slave/sage_git/build/logs/start.log
30641Describe your computer, operating system, etc.
30642make[2]: *** [/Users/buildslave-sage/slave/sage_git/build/local/etc/sage-started.txt] Error 1
30643make[1]: *** [start] Error 2

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​3ffb127	Use psutil instead of various hacks
​9f629df	Use resource instead of psutil to determine RLIMIT_AS

[jdemeyer]

I reverted this to using resource.getrlimit instead of psutil.