brynhild:bash# ./test.sh 
make -j2 tests

real    1m49.365s
user    4m2.620s
sys     0m15.220s

real    1m24.904s
user    3m12.930s
sys     0m13.410s
-----
make -j4 tests

real    1m29.272s
user    5m25.760s
sys     0m19.100s

real    1m9.331s
user    4m20.090s
sys     0m15.160s
-----
-----
make -j6 tests

real    1m29.087s
user    5m26.460s
sys     0m19.360s

real    1m9.723s
user    4m20.550s
sys     0m15.450s
-----