Performance of ld on GFS (Global File System)

[Ian Lance Taylor]

"Harald Anlauf" <anlauf@gmx.de> writes:

>> On Wed, Sep 24, 2008 at 10:02:45PM +0200, Harald Anlauf wrote:
>> > Operations like open and close are probably quite expensive.
>> 
>> In that case you might want to tweak bfd/cache.c BFD_CACHE_MAX_OPEN.
>
> 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.)
>
> (Empirically increasing BFD_CACHE_MAX_OPEN to 200 did not improve
> things further.)
>
> Anything else I can try?  Any other option that reduces the number of
> filesystem related system calls may be helpful.

The newer gold linker tries pretty hard to minimize system calls.  It
does expect to be able to mmap the input files for read access.

Ian