[issue30513] getrusage returns platform-dependent value

2017-05-30 Thread sam-s 

New submission from sam-s:

`resource.getrusage(resource.RUSAGE_SELF).ru_maxrss` returns the peak memory 
usage, in *bytes* on BSD (including Mac OS X) and in *kilobytes* on Linux.

This means that to get a cross-platform value, the user has to check 
`sys.platform`, which is fairly inconvenient.

It would seem like a good idea to return a platform-independent value (e.g., 
multiply the Linux return value by 1000 - or is it 1024?!)

Please see also 

* https://bugs.python.org/issue20468
* https://stackoverflow.com/a/7669482/850781

Thank you!

--
components: Library (Lib)
messages: 294768
nosy: sam-s
priority: normal
severity: normal
status: open
title: getrusage returns platform-dependent value
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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[issue30513] getrusage returns platform-dependent value

2017-05-30 Thread sam-s 

sam-s added the comment:

Experiment shows that the Linux multiplier is 1024 (not 1000).

--

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[issue30515] unittest: assertAlmostEqual rounding error

2017-05-30 Thread sam-s 

New submission from sam-s:

I get this `unittest` failure:

```
Traceback (most recent call last):
  File "zzz.py", line 348, in test_opposite
self.assertAlmostEqual(a, b, places=2)
AssertionError: 1.1036640046288428 != 1.0986122886681098 within 2 places
```

This seems incorrect: 1.1036640046288428 rounded off to 2 places is 1.10 and so 
is 1.0986122886681098.

E.g., in Lisp:

```
> (round 1.1036640046288428d0 0.01)
110 ;
0.0036640292157588336d0
> (round 1.0986122886681098d0 0.01)
110 ;
-0.001387686744974238d0
```

--
components: Library (Lib)
messages: 294772
nosy: sam-s
priority: normal
severity: normal
status: open
title: unittest: assertAlmostEqual rounding error
versions: Python 2.7

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[issue30515] unittest: assertAlmostEqual rounding error

2017-05-30 Thread sam-s 

sam-s added the comment:

you are right, sorry.

--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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