Naive speculation, but could it be J is waiting to see the status
of the break file?
Henry Rich wrote:
Yes, that is clearly what is happening. I was just wondering
why the data gets flushed to disk before I can type the next
line into J. I would have expected that there would be a buzz
of disk activity while subsequent J sentences are being executed,
but it seems that something is preventing execution from continuing
until the files are synced out to the disk. I'm just curious.
When I said "Roger is in there doing something" I was reverting
to the way I talk to the highschoool kids. Rather than say,
"the interpreter executes your sentence" I just say, "Roger
executes your sentence from right to left", or "Roger can't make
any sense of what you just typed". They enjoy all the things
Roger does for them.
Henry Rich
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Eric Iverson
Sent: Sunday, April 27, 2008 6:11 PM
To: Programming forum
Subject: Re: [Jprogramming] Does J flush files before
returning toimmediatemode?
In working on a project recently with many large files I have
observed
something that may be related to your experience. The host
seems to do
buffering that makes file io very quick. By quick I mean that
the io appears
finished to J so that J can continue but there is still
processing to be
done by the host to really get them on disk. But if there is
enough io
things eventually slow down so you see the real time to get
the bytes to
disk. Another way of thinking of this is that io for the
first hundreds of
magabytes is artificially fast, but after some point it
starts to be a
linear time per byte.
----- Original Message -----
From: "Henry Rich" <[EMAIL PROTECTED]>
To: "'Programming forum'" <[email protected]>
Sent: Sunday, April 27, 2008 3:55 PM
Subject: [Jprogramming] Does J flush files before returning to
immediatemode?
I'm curious about a behavior I have seen.
I have a program that creates a few hundred files using
1!:2, and types
a message as it creates each one. Files are about 4MB each.
It zips through them, and the messages fly by. But then,
after all the
messages have been typed, there is a delay of maybe 10
seconds before
J will accept another command. The program is finished,
but Roger is
in there doing something.
Any idea what?
Henry Rich
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--
Clifford A. Reiter
Mathematics Department, Lafayette College
Easton, PA 18042 USA, 610-330-5277
http://www.lafayette.edu/~reiterc
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