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Re: Mac OS X build reference?
From: |
Richard Campbell |
Subject: |
Re: Mac OS X build reference? |
Date: |
Fri, 18 Feb 2011 14:03:23 -0500 |
If you have two i7s (approx the last six months of apple products, maybe more)
then you have 4 logical cores due to hyperthreading, and you should use -j4.
Generally there's not much downside to using a higher -j number than you have
logical cores, although you will eventually run out of ram (but probably not
until -j 32 or so, on a machine with 4 gb ram).
I've never encountered race conditions with make - that would be a problem with
make, though, not the Octave sources, right?
Campbell
On Feb 18, 2011, at 13:05, Jordi Gutiérrez Hermoso <address@hidden> wrote:
> On 18 February 2011 11:51, fork <address@hidden> wrote:
>> Jordi Gutiérrez Hermoso <jordigh <at> gmail.com> writes:
>>
>>> Four hours??? Something's wrong. It takes 2 minutes for me.
>>>
>>> To compile all of Octave? It takes about 30-40 minutes for me. Are you
>>> parallelising the build?
>>
>> probably not -- I have 2 cores, how do I do that?
>
> "make -j2" will run two compilation processes at once (no prize if
> you guess how to run 4 at once), but it can fail subtly due to
> compilation time race conditions. Try again if it does, or remove the
> -j2 for the portion it could be stuck on.
>
> - Jordi G. H.
- Re: Mac OS X build reference?, (continued)
- Re: Mac OS X build reference?, fork, 2011/02/18
- Re: Mac OS X build reference?, Richard Campbell, 2011/02/18
- Re: Mac OS X build reference?, fork, 2011/02/18
- Re: Mac OS X build reference?, Richard Campbell, 2011/02/18
- Re: Mac OS X build reference?, fork, 2011/02/18
- Re: Mac OS X build reference?, Richard Campbell, 2011/02/18
- Re: Mac OS X build reference?, Jordi Gutiérrez Hermoso, 2011/02/18
- Re: Mac OS X build reference?, fork, 2011/02/18
- Re: Mac OS X build reference?, Jordi Gutiérrez Hermoso, 2011/02/18
- Re: Mac OS X build reference?,
Richard Campbell <=
- Re: Mac OS X build reference?, fork, 2011/02/18
Re: Mac OS X build reference?, fork, 2011/02/19
Re: Mac OS X build reference?, Ben Abbott, 2011/02/19
Re: Mac OS X build reference?, Richard Campbell, 2011/02/19