Joerg Schilling wrote:
Bill Davidsen <[EMAIL PROTECTED]> wrote:
But now I see where you like to use O_DIRECT.
If you use O_DIRECT for writing, it makes sense and in the same case
it makes sense to use directio(fd, DIRECTIO_ON); on Solaris.
By not buffering the output of mkisofs, for example, buffer space is
available for reading. This makes a small improvement on a large memory,
much more as the memory is smaller and read ahead could be impacted by
buffering writes.
Although on Solaris, it only saves System CPU time and I cannot see
an wall clock improvement.
I haven't tested there, and I bet you have not tested in small memory (I
use 160MB for test).
Whether this makes sense with the _output_ file from star or mkisofs
needs to be tested.....
I had not tried with the output of star, that's an interesting suggestion.
I did try it recently with creating a SchilliX ISO image (~ 20000 files
700 MB) and it did not help.
Did you do the test on a machine with limited memory? I may have asked
this before, but I don't see a reply, sorry if this is a repeated
question. I find the great benefit when memory for buffers is limited.
Thanks for testing.
--
bill davidsen <[EMAIL PROTECTED]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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