[daip] slow flagging

[Marina Kounkel]

Hm, that helped with the displaying sizes, but it didn’t really seem to do affect the speed of flagging by all that much. It seems that even if I were to leave the screen to be very tiny, it still takes about a minute to process the flagging command fully.

Thanks,
Marina


> On Sep 13, 2017, at 7:57 AM, Eric Greisen <egreisen at nrao.edu> wrote:
> 
> On 09/11/2017 05:49 PM, Marina Kounkel wrote:
>> Hi,
>> I’ve recently set up aips on a new 27” iMac machine, and I ran into a weird issue - when I run editr, the flagging is ridiculously slow - it takes several minutes to flag a time range, even just a handful of points, around 2 orders of magnitude slower than usual. Additionally, the font of all the commands is about twice as large compared how I am used to seeing them (even on similar-sized displays). Other TV-related issues don’t seem to be affected - the plotting of all the data happens at reasonable speed, at least. When I ssh into the machine, though, and run everything remotely, using local display, I don’t have this issue. I was wondering if you have any thoughts about any display settings that could be tweaked a bit to speed it up a bit.
>> Thanks,
>> Marina
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> 
> The verb charmult controls the size of the characters on the TV screen and particularly large TVs start with the multiplier set greater than 1.
> 
> TV behavior does slow down with really large screens (and small pixels) but getting normal behavior for plotting and yet having EDITR go way slow is strange.  Looking at the code for time range, it looks through the data array rather than checking each pixel.  So I do not see why it should be significantly slower.  If you have a lot of data points, then the larger number of pixels means a large number of samples at different pixels which will slow things but not factors of 10 or 100.The AIPS TV is controlled in pat with the $HOME/.Xdefaults file.  If you have same, you can add AIPS XAS parameter lines or you can create one.  I would suggest an experiment - exit your current aips killing the TV.  Edit your .Xdefaults file and then
> 
>        xrdb -merge ~/.Xdefaults
> 
> The lines to put in are
> AIPStv*xPixels:        1270
> AIPStv*yPixels:         924
> 
> to limit the size of your TV.  Choose appropriate numbers - these are from my file and keep the TV to the size of one of my 2 screens.  Note that this may be desirable for you too so that you have real estate for message and input windows.  Try EDITR with the smaller screen and see if that fixes the issue.  Otherwise go back to not limiting the size.
> 
> ERic Greisen