Performance of ld on GFS (Global File System)

[Harald Anlauf]

> I increased BFD_CACHE_MAX_OPEN from 10 to 100, which I presumed to
> be large enough.  On GFS, system time and wall time for linking went down
> between 30 to 40%, which is good, but still far from a factor 100 or so. 
> :-(
> (The change was neutral on the system with local disk.)

In the meantime I was pointed out off-list that linking is much faster
when the resulting binary is placed on a local disk instead of on GFS.
It is not necessary to copy input files or libraries to the local filesystem.

So a workaround is to rename ld and call it by a suitable wrapper script,
which generates the binary on a temporary filesystem and copies it back.

This actually reduces system and wall clock time by a factor of about 100,
and I am almost back to normal.

Cheers,
Harald

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