Re: How do you set VERBOSE for parallel testin

[Peter Johansson]

On 05/15/2015 12:24 AM, Arthur Schwarz wrote:
> > > > And as a simple question, why are you using "make -j8"? Shouldn't this
> be part of the automake generated test code?
> > > The short answer is because I wanna use 8 cpus. There is no sensible way
> Automake can know how many cpus I wanna use.
> > $ make check TESTSUITEFLAGS=-j8
> I just searched the Automake.html manual and can't find TESTSUITEFLAGS.
> Where is this documented? Is this part of a new release?
>
> Unlike Serial Test Harness execution, the Parallel Test Harness does not
> output how it executes its tests. No way to find out what's under the hood
> without checking the code.
>
> I haven't looked at the Makefile source - mainly, I suspect, because I'm not
> a make guru (or even an aficionado). My guess was that The Makefile directed
> test execution was either:
>
>     make -j# $(TESTS)   or
>   
>     for I in $(TESTS); do make -j $i; done

Your guess is wrong. The key line in 'Makefile.in' is

$(TEST_SUITE_LOG): $(TEST_LOGS)

which means that before creating 'test-suite.log' the log file for each 
test is generated. This structure *allows* parallel execution, but only 
if the user chooses to. If the user run make single-threaded the test 
suite will be run on a single cpu. This is by design. If a user issues 
'make check' you want one single cpu to be used; it would be very 
annoying if make spawned away processes. If a user issues 'make -jX' 
then the structure allows make to run tests in parallel. This is not 
possible in the old serial test suite, which basically just ran the 
tests in a loop.

Cheers,
Peter