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Caravel Forum : DROD Boards : Bugs : Deleting commands takes forever (...if there are a lot of them.)
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Xindaris
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 icon Deleting commands takes forever (+1)  
I'm not really sure if this is a bug or just a consequence of the overall way commands are handled, but if there are a lot of commands in a character and I try to delete them all at once, DROD practically seems to freeze for several minutes before having finally gotten rid of the code. The first couple of times this happened I had it in fullscreen and thought my entire computer had locked up.

I realize that I'm talking about numbers on the order of almost 2000 commands, but the thing is that if I go into something like notepad++ with the same ~2000 commands copy-pasted in text form out of DROD's editor and ask it to delete the exact same information it takes it maybe half a second.

This comes up, and is extremely bothersome, when I need to reconfigure a lot of things on a big block of code, which is easier to do in an external text editor with basic functions like ctrl+f, and then I need to replace the old code with the new code, which requires deleting the old code. Also when I need to update this code on two very similarly coded characters that have a small but extremely important difference in behavior.

Notably, it seems to take the editor less time to delete the code when I do it in chunks, which seems counterintuitive as it should just be deleting the exact same amount of information? And doing so feels more like a workaround than a fix.

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[Last edited by Xindaris at 08-03-2015 08:40 PM]
08-03-2015 at 08:36 PM
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mrimer
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 icon Re: Deleting commands takes forever (0)  
I agree deleting all commands should probably go faster. Would you please attach a sample of a lot of commands that can reproduce this issue?

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12-10-2015 at 01:30 AM
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Xindaris
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File: Long Code Sample.hold (6.6 KB)
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 icon Re: Deleting commands takes forever (+2)  
Sure, here's one of the things I actually ran into this problem with while trying to echo some changes from one version to another of the same type of block (some custom pushables I've mostly finished developing, except for dealing with Construct-pushing-characters stuff that I need 5.1 for, and possibly incorporating weapon detection if it actually gets added):
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It's...pretty long. But pasting it in takes just a second, while deleting takes so long that clicking the screen can cause windows to mark DROD as "Not responding" and ask me if I want it to force close.


EDIT: It's occurred to me the code requires some variables and refers to three different characters with custom graphics...so, I've just attached a one-room hold with the three relevant characters and all the variables and whatnot included so it should work properly.

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[Last edited by Xindaris at 12-10-2015 03:46 AM]
12-10-2015 at 03:27 AM
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DezzTech
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 icon Re: Deleting commands takes forever (+2)  
Assuming CCharacterDialogWidget::DeleteCommands is the function that deletes commands (which is a logical thing to assume, right?), I see where's the problem.

The loop over commands to delete is obviously the bottleneck here, let's look at it (note that I'm calculating complexity for the case when ALL commands are selected):

Loop (O(n)) goes over the commands in the reverse order, which means this line:
commands.erase(iter);

is always O(1).
But then THIS happens:
pActiveCommandList->RemoveItem(pCommand);


CListBoxWidget::RemoveItem performs a linear search (O(n)) on the Items vector EACH time it is invoked.
After item is found it calls GetSelectedItems() which is O(n log n), then Items->erase, which is O(1), since the item will always be in the last position.

But then it calls SelectItems and my brain is ******.
For EACH key it calls SelectItem, which AGAIN performs a linear search on Items and I'm SO DONE trying to calculate complexity for this. SelectItem in turn calls SelectLine, which, surprisingly doesn't perform any searches. But the first time it's called, it does call selectedLines.clear(); which is O(n).

My suggestion is to replace the Items vector with a hash map or whatever it's called in C++ (unordered_map?).

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12-10-2015 at 01:33 PM
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skell
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 icon Re: Deleting commands takes forever (0)  
Or add another optimized function for deleting multiple commands which does a proper cleanup after all entries are removed instead after every single command.

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12-10-2015 at 01:51 PM
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DezzTech
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 icon Re: Deleting commands takes forever (0)  
skell wrote:
Or add another optimized function for deleting multiple commands which does a proper cleanup after all entries are removed instead after every single command.

Just make sure to use remove_if or something similar to keep it close to O(n)

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12-10-2015 at 02:26 PM
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skell
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 icon Re: Deleting commands takes forever (+2)  
PR

4 thousand commands now take less than 2 seconds to remove, wherein previously about 800 commands would take about 7 seconds.

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10-13-2020 at 11:49 AM
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kieranmillar
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 icon Re: Deleting commands takes forever (+1)  
Can confirm in 5.1.1.alpha.2020-10-16 that pasting, selecting and deleting lots of script commands is very substantially faster. While my machine is not as quick as skell's, I did try to compare in the last stable version. Big mistake, it hung the program for ages. The latest alpha is very significantly faster.
10-18-2020 at 12:41 PM
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