On 2017-08-11 11:12, Mark Waddingham via use-livecode wrote:
On 2017-08-10 21:10, Richard Gaskin via use-livecode wrote:
How might I measure the benefits of long ID caching?
Here is perhaps a better set of simple benchmarks to compare approaches
to lookup (related to ids, anyway):
========
on mouseUp
local tIterations
put 100000 into tIterations
-- card id is 1002
-- button id is 1003
-- group id is 1004
local tLongId
put the long id of button id 1003 of group id 1004 of card id 1002
into tLongId
local tButtonIdOfStack
put "button id 1003 of stack" && quote & "LongIdSpeedTest" & quote
into tButtonIdOfStack
local tButtonIdOfCardIdOfStack
put "button id 1003 of card id 1002 of stack" && quote &
"LongIdSpeedTest" & quote into tButtonIdOfCardIdOfStack
local tTime
put the millisecs into tTime
repeat tIterations times
get the id of me
end repeat
put "Control" && (the millisecs - tTime) & return into msg
put the millisecs into tTime
repeat tIterations times
get the id of tLongId
end repeat
put "GetIdOfLongIdInString" && (the millisecs - tTime) & return after
msg
put the millisecs into tTime
repeat tIterations times
get the id of tButtonIdOfCardIdOfStack
end repeat
put "GetIdOfButtonIdOfCardIdOfStackInString" && (the millisecs -
tTime) & return after msg
put the millisecs into tTime
repeat tIterations times
get the id of tButtonIdOfStack
end repeat
put "GetIdOfButtonIdOfStackInString" && (the millisecs - tTime) &
return after msg
put the millisecs into tTime
repeat tIterations times
get the id of button id 1003 of group id 1004 of card id 1002 of
stack "LongIdSpeedTest"
end repeat
put "GetIdOfButtonIdOfGroupIdOfCardIdOfStack" && (the millisecs -
tTime) & return after msg
put the millisecs into tTime
repeat tIterations times
get the id of button id 1003 of card id 1002 of stack
"LongIdSpeedTest"
end repeat
put "GetIdOfButtonIdOfCardIdOfStack" && (the millisecs - tTime) &
return after msg
local tStackString
put "LongIdSpeed" & "Test" into tStackString
put the millisecs into tTime
repeat tIterations times
get the id of button id 1003 of group id 1004 of card id 1002 of
stack tStackString
end repeat
put "GetIdOfButtonIdOfGroupIdOfStackNotName" && (the millisecs -
tTime) & return after msg
put the millisecs into tTime
repeat tIterations times
get the id of button id 1003 of card id 1002 of stack tStackString
end repeat
put "GetIdOfButtonIdOfCardIdOfStackNotName" && (the millisecs -
tTime) & return after msg
end mouseUp
========
On my machine (in 8.1.5) I get:
Control 21
GetIdOfLongIdInString 714
GetIdOfButtonIdOfCardIdOfStackInString 497
GetIdOfButtonIdOfStackInString 320
GetIdOfButtonIdOfGroupIdOfCardIdOfStack 56
GetIdOfButtonIdOfCardIdOfStack 53
GetIdOfButtonIdOfGroupIdOfStackNotName 65
GetIdOfButtonIdOfCardIdOfStackNotName 63
So, currently, there is a significant overhead to getting a control
reference out of a string - the minimum you actually need in a string to
uniquely identify a control (which may or may not have per-card data) is
"control id ... of card id ... of stack ...".
Indeed - using the minimal info you need hard-coded in syntax:
get the id of button id 1003 of card id 1002 of stack tStackString
Is about 10 times faster than using a long id in a string and about 8
times faster than using a modified form of a string id to cut out the
(strictly) unnecessary bits:
get the id of "button id 1003 of card id 1002 of stack
LongIdSpeedTest" -- quoted name, appropriately
So, my advice changes *slightly* - if you are doing tight loops which
need to manipulate lots of controls in the current card of the
defaultStack use:
control id <id>
If the things aren't on the current card of the default stack, then
extract the card id and stack name outside of the loop and use:
control id <id> of card id tCardId of stack tStackName
The question of course is 'how fast could we get long id parsing to be'
(as that is the bottleneck here, or at least appears to be).
Warmest Regards,
Mark.
P.S. Due to a mailing server glitch any mails which were sent here
between 12:30BST and 14:00BST will not have got through.
--
Mark Waddingham ~ m...@livecode.com ~ http://www.livecode.com/
LiveCode: Everyone can create apps
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