resource limits on ppa build servers?

[Jan Wielemaker]

Hi,

My ppa sometimes fails to build due to a failing test.  The tests fail 
on ENOMEM in thread creation, mostly on x86 [1].  The failure doesn't 
consistently reproduce.  As these tests test notably concurrency
issues, it may well be that the actual resource usage from run to
run.  I have two simple questions:

   - How much resources are available to the build process?
   - Does this vary between servers and/or platforms?

	Thanks --- Jan

[1] https://launchpad.net/~swi-prolog/+archive/ubuntu/devel/+build/14230424