[J3] [EXTERNAL] [BULK] Re: Question to compiler developers about compilation speed

[Van Snyder]

On Wed, 2024-10-30 at 15:15 +0000, Clune, Thomas L. (GSFC-6101) via J3
wrote:
> Again – one of the first things we tried was to place all of the
> source files and TMPDIR onto SSD and we saw very little change in
> performance.
>  
> This suggests that I/O is not the bottleneck, unless it is metadata
> contention on our shared filesystem.    I would think the latter
> would also be small because we are not talking about lots of files
> here in the grand scheme and metadata access ought to be 2-3 orders
> of magnitude faster than what we are seeing.   I suppose if the
> compiler is opening and closing the same file over and over again
> then metadata might be the culprit.

I don't know what the situation is now, but many years ago, opening and
closing a small file was much more time consuming than reading it.

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