On 2017-08-08 09:57-0000 Arjen Markus wrote:

Hi Alan,

-----Original Message-----
From: Alan W. Irwin [mailto:ir...@beluga.phys.uvic.ca]
Sent: Tuesday, August 08, 2017 11:46 AM

So if you use make -j8 (or so) and ctest -j8 for your comprehensive test it 
will really
go ~4 times faster because those -j options will utilize your four cores 
But you have found in the past that the -j option gives unreliable results for 
make and ctest for both the Cygwin and MinGW-w64/MSYS2 platforms.  So you
have dropped these -j options with the result that you only use one of your 
but at least you do get slow but reliable results that way.

I explicitly use the build command "make" because of that, but I still see four instances 
of make running, as well as six instances of bash. This is with message "make VERBOSE=1 
test_noninteractive in the installed examples build tree" as the last visible text.

Not at all sure what this means, the information I get from the task manager 
does not reveal much about what these processes are actually doing (like in 
which directory etc.)

The cmake application configures a recursive series of Makefiles,
i.e., one make invokes another which invokes another.  And likely the
same is true of the shell (in this case bash) that is used to help
execute eacho of those nested Makefile rules.  So the real test would
be provided by a cpu meter which would measure the activity of your 4
cpus. And I predict without the -j options that would show an average
usage of 25 per cent for each of them or in other words you are only
using 1/4th the power of your machine with no -j options.

Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).

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