On 10/31/2013 5:21 PM, Michael Haberler wrote:
> Am 31.10.2013 um 21:58 schrieb Kent Reed <[email protected]>:
>
>> Point of information:
>>
>> Issue #2---review and merge new RTOS branch
>>
>> Which branch on the repository is the new RTOS branch?
> the reference tree and bug tracker is at
> https://github.com/mhaberler/linuxcnc/tree/unified-build-candidate-3 which I
> usually sync to git.linuxcnc.org
>
>
OK, then regarding the Todo-2.6 list item
2. review & merge new RTOS branch
...
2. verify that parallel builds work (some of the buildslaves should
use 'make -j2' probably)
I can say I've successfully built unified-build-candidate-3 on a number
of real and virtual hosts provisioned with a number of distros and
realtime kernels and with differing numbers of simultaneous make jobs. I
can't vouch for all configurations (no Hardy or Lucid on any
architecture, for example) and I haven't tried
--enable-build-documentation because Jeff's revised docs/src tree hadn't
been merged when I last built. Nevertheless, I don't think this item is
much of an issue. Still, "trust but verify." I'll try to post a table of
configurations I've already tested so others can fill in the gaps.
I routinely use -j2 on virtual hosts and real hosts. I haven't timed the
builds to see if there is any real gain using multiple jobs on a single
(virtual) cpu. I don't expect one. There certainly is a gain on real,
multicore cpus---I have run -j4 or higher on my quad-core AMD
system---but again I haven't timed the builds.
Incidentally, don't try "make -j<space>2", say. A naked -j indicates
"unlimited number of simultaneous jobs" and make is happy to spawn a ton
of them. An easy mistake to make late at night. Don't ask me how I know.
Regards,
Kent
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