Dear All,
I will try to post DTool source code asap ....
DTool is depend on our patented middleware, need one or two days to
clarify :-P
Very Sorry.
Bob,
I have tried your pdf but did not get good latency numbers even after
array tuning...
cheers
tharindu
Bob Friesenhahn wrote:
On Sat, 26 Jul 2008, Richard Elling wrote:
Is it doing buffered or sync writes? I'll try it later today or
tomorrow...
I have not seen the source code but truss shows that this program is
doing more than expected such as using send/recv to send a message. In
fact, send(), pollsys(), recv(), and write() constitute most of the
activity. A POSIX.4 real-time timer is created. Perhaps it uses two
threads, with one sending messages to the other over a socketpair, and
the second thread does the actual write.
I did not run your program in a real-time
scheduling class (see priocntl). Perhaps it would perform better using
real-time scheduling. It might also do better in a fixed-priority
class.
This might be more important. But a better solution is to assign a
processor set to run only the application -- a good idea any time you
need a predictable response.
Later on I did try running the program in the real time scheduling
class with high priority and it made no difference at all.
While it is clear that filesystem type (ZFS or UFS) does make a
significant difference, it seems that the program is doing more than
simply timing the write system call. A defect in the program could
easily account for the long delays.
It would help if source code for the program can be posted.
Bob
======================================
Bob Friesenhahn
[EMAIL PROTECTED],
http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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