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Re: Writing a very large file [message #57438 is a reply to message #57411]

Mon, 10 December 2007 07:24

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Dec 7, 11:50 pm, KenBowman <k-bow...@tamu.edu> wrote:

> What I suspect is happening is the following. The first few images go
> into cache (memory).
> Once the cache space is filled, it starts writing the files to disk,
> which is a much slower process.
> 6 seconds for a 32 MB file isn't great (~5 MB/s), but maybe you have
> older hardware or you are writing to
> a network volume?

Thanks for this and to the others who responded. I do have old
hardware, so my question should have been "how can the first few
images be written so quickly?". And it does appear that the answer
is that the images are being cached, so that the writing to the disk
continues after the call to WRITEU is completed. For example, if I
add a WAIT,6 between each call to WRITEU (so that the cache has time
to be emptied) then the call to WRITEU always completes quickly (<0.3
s) no matter how big the file. --Wayne

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[Message index]

		Re: Writing a very large file By: Bringfried Stecklum on Sat, 08 December 2007 08:19
		Re: Writing a very large file By: Kenneth Bowman on Fri, 07 December 2007 20:50
		Re: Writing a very large file By: Jim Pendleton, ITT Vi on Fri, 07 December 2007 13:47
		Re: Writing a very large file By: Jean H. on Fri, 07 December 2007 13:23
		Re: Writing a very large file By: pgrigis on Fri, 07 December 2007 12:39
		Re: Writing a very large file By: David Fanning on Fri, 07 December 2007 12:23
		Re: Writing a very large file By: wlandsman on Mon, 10 December 2007 07:24
		Re: Writing a very large file By: Kenneth Bowman on Mon, 10 December 2007 07:43

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