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Backing store [message #9913]

Thu, 11 September 1997 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

I run IDL on DEC Alpha Workstations running OSF/Digital Unix. I've noticed
that the newer machines give me more problems with backing store. In other
words, if a graphics window is covered up and then brought back to the
foreground, then the parts of the image that were obscured are lost, unless one
uses RETAIN=2. This is not a problem on the older Alpha workstations.

It seems to me that there are two possibilities. Either the problem is
associated with the newer Alpha hardware, or with the newer version of the
Operating System. So far, we have not upgraded our older machines to OSF 4.0,
so maybe that's why those machines do not give any problems.

I could put DEVICE, RETAIN=2 into the IDL startup script, but according to the
online help:

Pixmaps are a precious resource in the X server, so backing
pixmaps should only be requested for windows with contents
that must absolutely be preserved.

Has anyone else noticed this behavior under Digital Unix? Is there anything to
do to tune the system to keep this from happening?

Thank you,

William Thompson

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[Message index]

		Backing store By: thompson on Thu, 11 September 1997 00:00
		Re: backing store By: davidf on Wed, 04 March 1998 00:00
		Re: backing store By: Rick Towler on Tue, 28 June 2005 08:27
		Re: backing store By: KK T on Wed, 29 June 2005 01:45
		Re: backing store By: K. Bowman on Tue, 28 June 2005 07:15
		Re: backing store By: Rick Towler on Wed, 29 June 2005 08:50

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