Hi, I've added a SKIP_CHECKS flag to the ovirt-engine build here [1]. Thanks to Roy for the idea [2]. TL;DR: you'll save roughly 2 minutes 10 seconds per full compile with SKIP_CHECKS. You'll save more (3 min 10 sec) if you don't need a 'clean'. You'll save the most (about 3 min 20 sec) if you can skip rebuilding GWT. Here are some statistics (3 runs per command, for averages sake) My test machine is a Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz 256GB Samsung SSD (old, using SATA) 32GB DDR3 @ 1333 MT/s --- fresh master checkout no clean, no gwt, skip checks: make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=0 SKIP_CHECKS=1 1:04.38 total 1:06.04 total 1:04.41 total same as above, but now change one non-GWT class in the utils project make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=0 SKIP_CHECKS=1 1:05.49 total Ok, pretend we recompiled and our utils class change had an error. Same as above, change the one non-GWT class in the utils project again, and use the resume (-pl) functionality: make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=0 SKIP_CHECKS=1 EXTRA_BUILD_FLAGS="-pl org.ovirt.engine.core:utils" 17.958 total (yes, 18 seconds, obviously a world record for any engine build) [The resume piece is EXTRA_BUILD_FLAGS="-pl org.ovirt.engine.ui:webadmin" -- I personally need to use this more often!] --- no clean, no gwt, run checks (but skip unit tests): make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=0 BUILD_UT=0 3:07.66 total 3:16.69 total 3:14.28 total clean, no gwt, skip checks: make clean install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=0 SKIP_CHECKS=1 4:17.74 total 4:15.76 total 4:13.90 total no clean, gwt (1 permutation for chrome), skip checks: make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=1 SKIP_CHECKS=1 DEV_EXTRA_BUILD_FLAGS_GWT_DEFAULTS="-Dgwt.userAgent=safari" 4:25.63 total 4:26.71 total 4:30.69 total no clean, gwt (1 permutation for chrome), run checks but skip unit tests: make install-dev PREFIX=/home/greg/ovirt-engine BUILD_GWT=1 BUILD_UT=0 DEV_EXTRA_BUILD_FLAGS_GWT_DEFAULTS="-Dgwt.userAgent=safari" 6:44.23 total And the whole enchilada [3] ... clean, gwt (1 permutation for chrome), run checks, run unit tests: 11:52.25 total ... wow :) Hope this helps you have a faster change-compile-check cycle :) Best wishes, Greg [1] https://gerrit.ovirt.org/#/c/83961/ [2] https://www.mail-archive.com/devel@ovirt.org/msg10377.html [3] https://idioms.thefreedictionary.com/whole+enchilada -- GREG SHEREMETA SENIOR SOFTWARE ENGINEER - TEAM LEAD - RHV UX Red Hat NA <https://www.redhat.com/> gshereme@redhat.com IRC: gshereme <https://red.ht/sig>