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
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