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

gshereme@redhat.com    IRC: gshereme

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