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flukus
on Feb 4, 2021
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Threadripper 3990X: The Quest To Compile 1B Lines ...
Most compilers won't fsync will they? The output is likely not being written straight to disk.
It's caches all the way down.
rbanffy
on Feb 4, 2021
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And to max out disk bandwidth before you max out your CPU cores you need a really terrible disk.
I don't think many 8-way Xeon Platinum boxes have eMMC storage.
MayeulC
on Feb 5, 2021
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Well, using ramdisks will let you compare and make sure the disk isn't the bottleneck, at least.
corty
on Feb 4, 2021
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But all compilers will close(). Compare compile times on tmpfs and you will see an improvement.
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It's caches all the way down.