parallel make, do we have a FAQ ?

parallel make, do we have a FAQ ?

[Andreas Tobler]

Hi,

I got an Enterprise 2 and I was very exciting on the 2 CPU's handling a 
bootstrap.

Hm, make: Warning: Ignoring DistributedMake -j option. 50% idle.

Do we have a FAQ where parallel make is explained? When does it work? 
Only when building libraries?

Sorry, if this is a FAQ, but on the building section it only mentions: 
make -j 2 bootstrap.

Thanks for any pointer,

Andreas

Re: parallel make, do we have a FAQ ?

[Michael Matz]

Hi,

On Thu, 27 Feb 2003, Andreas Tobler wrote:

> Hm, make: Warning: Ignoring DistributedMake -j option. 50% idle.

Well, you seem to use a vendor make, not GNU make, ergo you should consult
the documentation of that one.

> Do we have a FAQ where parallel make is explained? When does it work?
> Only when building libraries?

It works everywhere.  For instance with GNU make I regularly do -j 10
makes (on the right machines of course ;-) ) and bootstraps.  Meanwhile
also libjava is built in parallel.

> Sorry, if this is a FAQ, but on the building section it only mentions:
> make -j 2 bootstrap.

Yes, there doesn't need to be a FAQ.  With the right make it simply works
(modulo the occassional bugs).  I would advice you to simply get GNU make,
and be done with it.


Ciao,
Michael.

Re: parallel make, do we have a FAQ ?

[DJ Delorie]

> Do we have a FAQ where parallel make is explained? When does it work? 
> Only when building libraries?

I regularly do "make -j2" from the top.  I don't see why a FAQ is
needed; it just works (at least with GNU make).  Are you using GNU
make?

Re: parallel make, do we have a FAQ ?

[Andreas Tobler]

DJ Delorie wrote:
>>Do we have a FAQ where parallel make is explained? When does it work? 
>>Only when building libraries?
> 
> 
> I regularly do "make -j2" from the top.  I don't see why a FAQ is
> needed; it just works (at least with GNU make).  Are you using GNU
> make?
> 
[enterprise:~/objdir] andreas% which make
make:    aliased to /usr/local/bin/make

[enterprise:~/] andreas% make -v
GNU Make 3.80
Copyright (C) 2002  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

Ah, I see, I have another make from /usr/ccs/bin. Renamed it and now I 
rocks!!

CPU states:  0.9% idle, 96.4% user,  2.1% kernel,  0.6% iowait,  0.0% swap

Thanks

Andreas

Re: parallel make, do we have a FAQ ?

[Kurt Wall]

Feigning erudition, Michael Matz wrote:

[...]

% > Do we have a FAQ where parallel make is explained? When does it work?
% > Only when building libraries?
% 
% It works everywhere.  For instance with GNU make I regularly do -j 10
% makes (on the right machines of course ;-) ) and bootstraps.  Meanwhile
% also libjava is built in parallel.

<envy color="deep_dark_green">
I'll take one of these machines, please. :-)
</envy>

Kurt
-- 
Don't take life too seriously -- you'll never get out of it alive.