Rob Ross wrote:
Regarding Peter Staubach's comments about no one ever using the
readdirplus() call; well, if people weren't performing this workload
in the first place, we wouldn't *need* this sort of call! This call is
specifically targeted at improving "ls -l" performance on large
directories, and Sage has pointed out quite nicely how that might work.
I don't think that anyone has shown a *need* for this sort of call yet,
actually. What application would actually benefit from this call and
where are the measurements? Simply asserting that "ls -l" will benefit
is not enough without some measurements. Or mention a different real
world application...
Having developed and prototyped the NFSv3 READDIRPLUS, I can tell you
that the wins were less than expected/hoped for and while it wasn't
all that hard to implement in a simple way, doing so in a high performance
fashion is much harder. Many implementations that I have heard about
turn off READDIRPLUS when dealing with a large directory.
Caching is what makes things fast and caching means avoiding going
over the network.
ps
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