On 2013-04-04 04:49 , Richard Biener wrote:
But yes, testing is the most time-consuming part, and the testsuite harness overhead is big. A combined bootstrap&test target could indeed interleave target library build and testing. General improvements to parallel testing support (hack upstream dejagnu?) to be less statically divided would also help.
Yes. Fortunately, the testsuite is the easiest component to parallelize. Internally, I've implemented a setup over our build system to split all the files in all the testsuite directories in N independent sets. This brings testing times from 1.5hrs down to 10min. There are some issues, however. Some directories have implicit dependencies: http://gcc.gnu.org/ml/fortran/2013-02/msg00106.html.
Not sure if improving things for people with distributed compile setup will help many people. It isn't my testing setup at least. At least make sure you don't regress things for people without distributed compile ;)
Agreed. make -j should be first priority. Multicores are easier to come by than clusters. And improvements in single-box builds, will also help distributed setups (better dependencies).
Diego.
