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Subject:	Re: [geda-user] gschem sometimes takes a nap
From:	Edward Hennessy <ehennes AT sbcglobal DOT net>
In-Reply-To:	<68DB3C77-2335-4016-B466-20CA135CD4CC@sbcglobal.net>
Date:	Fri, 5 Sep 2014 21:38:44 -0700
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On Sep 5, 2014, at 7:59 PM, Edward Hennessy <ehennes AT sbcglobal DOT net> wrote:

> 
> On Sep 5, 2014, at 2:25 AM, Kai-Martin Knaak <knaak AT iqo DOT uni-hannover DOT de> wrote:
> 
>> Edward Hennessy wrote:
>> 
>>> Does anyone have a schematic that can replicate
>>> the issue that would be available for me to use?
>> 
>> See my schematics guinea pig in the attachment. I was able to trigger the 
>> freeze by moving chunks of the schematic around.
>> 
> 
> I believe I've reproduced the issue on my machine with your schematic. I can
> sometimes get gschem to freeze a bit when moving objects around. However, when
> selecting all objects on the schematic using Ctrl-A, my gschem will freeze for
> five seconds.
> 
> When this freeze occurs, the function o_redraw_rects() is getting called with
> over 6000 rectangles. And, it appears the time is spent repainting the background.
> 
> Shutting off the grid or switching to dots makes the problem much less pronounced.
> 
> Does this description match what you are seeing?

A potential fix is checked into source control. Hopefully, it isn't just tuned to execute faster on my machine.

Something not intuitive is going on under the hood:

- The change in x_event.c reduces the number of invalid rectangles to one - yields a speed improvement
- The change in x_grid.c moves the cairo_stroke() into the for loop - performance actually gets WORSE
- When both changes are combined - performance is much faster than the changes in x_event.c alone

I've been able to resize the gschem window and get the naptime up to 10 seconds. These two changes reduce the time, under the same conditions, to about 1 second.

Cheers,
Ed

- Raw text -