'make --jobs all', 'make --jobs test', and concurrency

[David Christensen]

makemaker:

I have a computer with a multi-core processor, Debian 7, and Perl 
5.14.2.  'make --jobs all' seems to run concurrently, but 'make --jobs 
test' seems to be single-threaded.  Is there a way to run tests 
concurrently?


TIA,

David