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On 6/2/10 8:26 PM, Jack Howarth wrote:
> On Wed, Jun 02, 2010 at 08:04:20PM -0400, Benjamin Reed wrote:
> On 6/2/10 7:55 PM, Jack Howarth wrote:
>>>>   One possible workaround might be to change gcc45.info
>>>> to reduce the number of parallel builds so that the
>>>> load sensitivity is reduced. So instead of using...
>>>>
>>>>  num_cpu=$(echo `sysctl -n hw.ncpu`)
>>>>  make -j $num_cpu
>>>>
>>>> we would reduce num_cpu by one if greater
>>>> than one so that the build is either serial
>>>> or leaves a free core whenever building in parallel.
>>>> This won't 'fix' the problem but it might make
>>>> it less likely.
> 
> So if GCC's build is not repeatably compatible with -jN, then it
> should probably not be doing it by default.  :P
> 
>>   This is a recent regression upstream. The question is do you
>> penalize all users with multiple core machines for those
>> unlucky users running two cores at high load? As I said before,
>> a rational (and less extreme) workaround would be to leave
>> a free core available to reduce the load on the machine.
>> I build gcc trunk nightly and have never seen this failure
>> on a dual quad.
>>              Jack
> 
> 
> 

I'll point out that I had my single instance of this failure on a
single-core powerpc, and had no such problem building on a two-core
Macbook under load.

- -- 
Alexander Hansen
Fink User Liaison
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