Should Au3Check Count Global Variables Declared Inside Functions?
By
TheDcoder, in AutoIt Technical Discussion
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Similar Content
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By California
Hello,
I wrote a benchmark script to measure variable declarations
to find out whether you should focus more on static or global variables
#cs ---------------------------------------------------------------------------- AutoIt Version: 3.3.14.5 #ce ---------------------------------------------------------------------------- #Region Pre-Setting Local $iTally1 = 0 Local $iTally2 = 0 Local $iTally3 = 0 Local $iTally4 = 0 Local $iTally5 = 0 Local $iTally6 = 0 Local $iTally7 = 0 Global $GLOBALCONST1 = 1 Global $GLOBALCONST2 = 1 Global $GLOBALCONST3 = 1 Global $GLOBALCONST4 = 1 Global $GLOBALCONST5 = 1 #EndRegion Pre-Setting #Region Test Functions Func s1() Static $i = $GLOBALCONST1 Return $i EndFunc Func g2() Return $GLOBALCONST2 EndFunc Func g3() Static $i7 = "gsdgdfegbgbrwefw" Return $GLOBALCONST3 EndFunc Func g4() Static $i1 = 1 Static $i2 = "asd" Static $i3 = 234 Static $i4 = True Static $i5 = [0] Static $i6 = "hgsdg" Static $i7 = 1 Static $i8 = 1 Static $i9 = 1 Static $i0 = 1 Return $GLOBALCONST4 EndFunc Func g5() Local $i = $GLOBALCONST5 Return $i EndFunc Func g6() Local $i = 1 Return $i EndFunc Func g7() Return 1 EndFunc #EndRegion Test Functions #Region Benchmark Loop For $i = 0 To 15 Local $tDelta = TimerInit() Do $iTally1 += s1() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally2 += g2() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally3 += g3() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally4 += g4() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally5 += g5() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally6 += g6() Until TimerDiff($tDelta) >= 1000 Local $tDelta = TimerInit() Do $iTally7 += g7() Until TimerDiff($tDelta) >= 1000 Next #EndRegion Benchmark Loop ConsoleWrite(@CRLF&"Static1: "&$iTally1&" pkt"&@CRLF&"Global2: "&$iTally2&" pkt"&@CRLF&"Global3: "&$iTally3&" pkt"&@CRLF&"Global4: "&$iTally4&" pkt"&@CRLF&"Local5: "&$iTally5&" pkt"&@CRLF&"Local6: "&$iTally6&" pkt"&@CRLF&"Hardcode7:"&$iTally7&" pkt"&@CRLF) #cs Result Static1: 10291881 pkt global to static Global2: 13977324 pkt only global Global3: 9886169 pkt global and static Global4: 2933051 pkt global and many statics Local5: 9937314 pkt global to local Local6: 10306484 pkt only local Hardcode7: 14835319 pkt no variable #ce Result:
100% no variable, hardcore value
94% only global variable use
69% only local variable use with hardcore value set
69% only static variable use with global variable value set
67% declaration of local variable with global variable value set
66% only global variable use with one static variable beside
20% only global variable use with ten static variables beside
My thesis of the result:
Be careful with declarations, whether local, global or static Note: in my test the global variable performance was better than the local one, but in practice the global one would lose performance due to multiple operations
What is your best practice sharing data between multiple functions?
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By TheAutomator
Is this better to check a variable before you assign it to a value that could be the same?
for example:
local $EmptyLog = false func WriteLog($text) _guictrledit_appendtext($log, ($EmptyLog ? @CRLF : $empty) & $text) If $EmptyLog Then $EmptyLog = False endfunc or does AutoIt behind the scenes already check this?
i guess overwriting memory with the same value over and over again is not good if you can prevent this with a check?
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By JNutt
I see $hWnd used as a local variable in a lot of script examples. I know the 'h' is used for handles, but what is the 'Wnd' short for?
Thanks!
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By Rskm
i have seen many pointing out issues related to this, i tried reading through them - still unable to solve mine.. i have a script which reads certain lines based on a search item, this is an iterative process - the ldflst_file gets updated for each iteration and the script finds the line number which has the search item. this works perfectly for few iterations, but stops in some cases abruptly with the error =
Subscript used on non-accessible variable $aRead^ ERROR I have verified that the search item is present in the file. what could be the reason for this code to stop in certain cases. thanks for help
my code below (partial).. full code is in attachment
local $aRead=FileReadToArray($ldflst_file)
global $ldflst_var1=" JOINT LOAD FORCE(X) FORCE(Y) FORCE(Z) MOMENT(X) MOMENT(Y) MOMENT(Z)"
for $i= 0 to $ldflst_totlines ; ldflst_totlines is total number of lines in the file 'ldflst_file'
if $aRead[$i]=$ldflst_var1 Then
$ldflst_LFound=$i
ExitLoop
else
EndIf
Next
nomo_new1.au3
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