version 1.2540 stability
Hi, I just upgraded my May version with the last version of Chimera for PC and am having stability problems. Every now an then (every 10' or so), chimera freezes and the cursor flickers for a couple of seconds; then all goes back to normal. Sometimes, it just crashes completely. Is this last version more demanding on memory? Thanks James
Hi James, Chimera memory use has not changed significantly. More likely your problems are due to graphics driver bugs. You might try turning off multisampling (opengl optimization that smooths edges). Use menu entry Tools / Viewing Controls / Effects and see if "multisampling" is on -- this depends on whether your graphics card supports it. If it is on turn it off (false). Use the Save button on the Effects tab if this solves your instability problems and then it will be off each time you start Chimera. Tom
Dear Tom, thanks for your reply, but it didn't change anything; the problem remains. Moving back to version 1.2509 of last May made it go away; but this is only a temporary solution. The graphics card is an ATI Radeon Mobility X1400. Next step I guess will be to update the driver! Any other suggestions? James Tom Goddard wrote:
Hi James,
Chimera memory use has not changed significantly. More likely your problems are due to graphics driver bugs. You might try turning off multisampling (opengl optimization that smooths edges). Use menu entry Tools / Viewing Controls / Effects and see if "multisampling" is on -- this depends on whether your graphics card supports it. If it is on turn it off (false). Use the Save button on the Effects tab if this solves your instability problems and then it will be off each time you start Chimera.
Tom
Hi James, Updating your graphics driver is the best hope, though it only occasionally helps. Problems specific to older graphics cards may never be fixed. Not sure what Chimera graphics features changed that caused your problem. Would help to know what type of data is being displayed when the problems occur, only molecules, only maps, what display styles? For map display the Chimera 1.2540 uses opengl vertex buffer objects which were not used in older Chimera versions. Gives a 2-3x speed-up. No way to disable that optimization in Chimera currently but I plan on adding a switch. There is a previous Chimera bug report Radeon X1400 graphics driver issue: http://www.cgl.ucsf.edu/chimera/graphics/graphicsbugs.html Tom James Fethiere wrote:
Dear Tom,
thanks for your reply, but it didn't change anything; the problem remains. Moving back to version 1.2509 of last May made it go away; but this is only a temporary solution. The graphics card is an ATI Radeon Mobility X1400. Next step I guess will be to update the driver! Any other suggestions?
James
Tom Goddard wrote:
Hi James,
Chimera memory use has not changed significantly. More likely your problems are due to graphics driver bugs. You might try turning off multisampling (opengl optimization that smooths edges). Use menu entry Tools / Viewing Controls / Effects and see if "multisampling" is on -- this depends on whether your graphics card supports it. If it is on turn it off (false). Use the Save button on the Effects tab if this solves your instability problems and then it will be off each time you start Chimera.
Tom
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James Fethiere -
Tom Goddard