flang-20 port is building VERY SLOWLY, "memory pressure" (Activity monitor) is very high

[Chris Jones]

On 07/03/2025 3:39 am, Joshua Root wrote:
>> Building flang has always been CPU+RAM intensive, but it looks like it is
>> thrashing now.
>>
>>    Is there a way to make it go single threaded?  I have like ten "stuck"
>> clang processes...
> 
> A better solution would be to set build.mem_per_job to something higher 
> in the port. It defaults to 1024 (MB) and is used to limit the number of 
> parallel build processes based on the available memory.

1GB per thread is from what I have seen not unreasonable for flang. I've 
never seen any specific issues myself so would like to see more details 
of the problem seen before changing anything here.

Kenneth please open a trac ticket with more details, how many thread are 
start for you, where in the build specifically do you have issues etc.

Chris