> Regardless of whether you choose to measure latency or CPU load
> if you vary the st_blksize as specified in the previous email,
> you will not be able distinguish between the two values of
> st_blksize due to the influence of other factors.
What are you talking about? How can one vary st_blksize or choose a
preferred value for it? Are you assuming that I am writing a kernel
driver? Why?
If you meant the actual request size, then I think that (1) none of us
have performed measurements and (2) as I stated, if no measurements
have been performed, and if the implementation allows it, standard
recommendations should be obeyed.
> The behavior of fread() can be dubious for files accessed
> via NFS with respect to incomplete reads (ie EAGAIN). The
> only solution to this is to use read().
Please detail this somewhat. NFS was one of the use-cases I mentioned
in the beginning (and I actively use it).
>> else address the issues that arise from breaking the rules (i.e.
>
> Breaking what rules?
K&R C and even CS1 choices (fread / fwrite), unless you have a reason
to break them... Not that I would be at that level...
> You provide concrete proof that doing block sized reads makes
> any positive performance improvement and I'll implement block
> sized reads and buffering.
You have already said you would accept patches and contributions for
this specific issues (a userspace cache) in past e-mails. Are you
retracting (or qualifying) the offer? In any case, you already have
the VIO layer, which certainly WFM -- my programs work.
> Until you can show concrete proof I consider this issue closed.
Which issue? I was merely discussing choices. And I was arguing that
YOUR VIO code is a GOOD thing. Uh, please don't remove it :)
Anyway, I have found sndfile to be an extremely valuable library.
-- Dan
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Received on Tue Jul 5 16:15:03 2011
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