[Numpy-discussion] Silencing NumPy output

[Frédéric Bastien]

If it don't change, currently it mean that each process that use
Theano and use BLAS will have that printed:

Found executable /usr/bin/gfortran
ATLAS version 3.8.3 built by mockbuild on Wed Jul 28 02:12:34 UTC 2010:
   UNAME    : Linux x86-15.phx2.fedoraproject.org 2.6.32-44.el6.x86_64
#1 SMP Wed Jul 7 15:47:50 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
   INSTFLG  : -1 0 -a 1
   ARCHDEFS : -DATL_OS_Linux -DATL_ARCH_Corei7 -DATL_CPUMHZ=1596
-DATL_SSE3 -DATL_SSE2 -DATL_SSE1 -DATL_USE64BITS -DATL_GAS_x8664
   F2CDEFS  : -DAdd_ -DF77_INTEGER=int -DStringSunStyle
   CACHEEDGE: 524288
   F77      : gfortran, version GNU Fortran (GCC) 4.5.0 20100716 (Red
Hat 4.5.0-3)
   F77FLAGS : -O -g -Wa,--noexecstack -fPIC -m64
   SMC      : gcc, version gcc (GCC) 4.5.0 20100716 (Red Hat 4.5.0-3)
   SMCFLAGS : -fomit-frame-pointer -mfpmath=sse -msse3 -O2
-fno-schedule-insns2 -g -Wa,--noexecstack -fPIC -m64
   SKC      : gcc, version gcc (GCC) 4.5.0 20100716 (Red Hat 4.5.0-3)
   SKCFLAGS : -fomit-frame-pointer -mfpmath=sse -msse3 -O2
-fno-schedule-insns2 -g -Wa,--noexecstack -fPIC -m64

Not very nice.

As told, in Theano we do that and it work on Mac, Linux and Windows in
32 and 64 bits. Yes, we have our own wrapper around it to handle
windows. But as it is already done and tested in those cases, I think
it is a good idea to do it.

Do you think that it should be tested in other environment?

thanks

Frédéric

p.s. There is also warning printed, but I can hide them without change in NumPy.
p.p.s The first line isn't yet removed in my local tests, so maybe
more is needed.

On Fri, Nov 15, 2013 at 2:28 PM, David Cournapeau <cournape at gmail.com> wrote:
>
>
>
> On Fri, Nov 15, 2013 at 6:21 PM, Charles R Harris
> <charlesr.harris at gmail.com> wrote:
>>
>>
>>
>>
>> On Fri, Nov 15, 2013 at 11:05 AM, Frédéric Bastien <nouiz at nouiz.org>
>> wrote:
>>>
>>> I found a line like this in the file:
>>>
>>> numpy/distutils/fcompiler/__init__.py
>>>
>>> I changed the -2 to 2, but it didn't change anything. In fact, this
>>> line wasn't called.
>>>
>>> The fct set_verbosity() is called only once, with the value of 0. The
>>> default value set at import. If I change that to 2 or -2, it do not
>>> change anything.
>>>
>>> I think that the problem is related to the exec_command as you told.
>>> It seam it call it in a way that don't take the stdout/stderr set in
>>> Python. So I can't redirect it. The problem is that is use os.system()
>>> and we can't redirect its stdout/stderr.
>>>
>>> What about replacing the os.system call to  subprocess.Popen? This
>>> would allow us to catch the stdout/stderr. We use this call in Theano
>>> and it is compatible with python 2.4.
>>>
>>
>> Numpy 1.8 doesn't support python 2.4 in any case, so that isn't a problem
>> ;)
>>
>> Sure, give it a shot. Looks like subprocess.Popen was intended to replace
>> os.system in any case.
>
>
> Except that output is not 'real time' with straight Popen, and doing so
> reliably on every platform (cough - windows - cough) is not completely
> trivial. You also have to handle buffered output, etc... That code is very
> fragile, so this would be quite a lot of testing to change, and I am not
> sure it worths it.
>
> David
>
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