comp.lang.idl-pvwave archive: archive » point

Home » Public Forums » archive » point_lun is slow

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: point_lun is slow [message #17560 is a reply to message #17437]

Fri, 29 October 1999 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <38170AD4.2EC9@gsfc.nasa.gov>,
George McCabe <george.mccabe@gsfc.nasa.gov> wrote:
> hello,
>
> reading from a data file at regularly spaced byte locations, 2 bytes at
> a time using point_lun - my program is abnormally slow. i don't have
> enough experience to guess whether the poor performance is inherent to
> point_lun & readu approach or if there are options which are affecting
> execution adversely.

I generally map the entire file into memory (see my web site). As long
as it's on local storage its usually faster than reading it into memory,
especially if the file is larger than physical memory.

Currently only works on Unix systems, though. Haven't done a windows
version.

Eric

--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
<a href="http://sag-www.ssl.berkeley.edu/~korpela">Click for home page.</a>

Report message to a moderator

[Message index]

		point_lun is slow By: George McCabe on Wed, 27 October 1999 00:00
		Re: point_lun is slow By: korpela on Fri, 29 October 1999 00:00
		Re: point_lun is slow By: korpela on Fri, 29 October 1999 00:00
		Re: point_lun is slow By: Liam Gumley on Thu, 28 October 1999 00:00
		Re: point_lun is slow By: George McCabe on Thu, 28 October 1999 00:00
		Re: point_lun is slow By: Struan Gray on Thu, 28 October 1999 00:00
		Re: point_lun is slow By: <karri on Thu, 28 October 1999 00:00
		Re: point_lun is slow By: George McCabe on Mon, 01 November 1999 00:00

Previous Topic:	Is there a way to keep axis text from scaling?
Next Topic:	IDL 5.2.1 -- bug in filled contours?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 17:18:54 PDT 2025

Total time taken to generate the page: 0.00467 seconds