Harold Lee wrote:
Peter Jay Salzman wrote:
1. Is there a cron for Windows? I would like to run something like:
cd /path/to/application
ant create.reference.data
before coming into work.
Look up the command "at". I think if you run "at help" on the command
line, it'll help you out.
2. Is there a nice for Windows?
I don't think the ref data is built any faster when it has full
control of my system. I really would like to read digg.com while
the data is being built. Is there a way to nice a process in
Windows?
MS discourages people from playing around with process priorities
because, in my experience, it is easy for processes to get CPU starved
or to hog the CPU - not a lot of subtlety in the scheduler, I think.
Better to just run it when you're not around.
My guess is that you're killing the disk, writing tons of data as fast
as you can pull it over a gigabit ethernet - if that's the case, and you
need to be able to use the computer meanwhile, you could always add a
sleep() call (or Java equivalent) to wait a little while after each
write to disk. Also look at how much data you're gathering before each
write - maybe it'll help Windows if you build a larger buffer of binary
data and do fewer, larger writes... just a thought.
Actually, it does seem odd that an I/O-bound process is starving the CPU...
that is usually due to inefficient code (e.g. memory thrashing or busy-
wait).
Another idea: reduce the amount of data that needs to be transferred.
One way is to transfer only data updated since the last sync using
timestamps in the data and queries that limit the data retrieved.
Another is to keep a transaction log and "roll forward" your cached
copies of the data.
If you have the option of running a local copy of Oracle you may be able
to take advantage of an optimized implementation of database
replication that handles these actions internally and saves you from
having to debug yet another database replication strategy.
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