Buildworld Benchmarks

[Reko Turja]

> We thought going tmpfs would make things faster, but that resulted 
> in over 13
> minutes (huh? you'd think a RAM disk would be smoking compared to 
> even the SSDs
> that we used to achieve ~9 min; do note that we did make sure to 
> nullfs mount a
> tmpfs-based directory onto /usr/obj -- though the performance of 
> that nullfs
> mount might have hurt the test, not sure).

I think that doing huge parallel build and using part of memory bus 
bandwidth for storage is the culprit. DMA offloading the storage 
operations directly from memory to the disks is giving the advantage 
to builds using disk IO.

-Reko