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Thread: Different loops type. Speed test script

  1. #1
    thinBasic author ErosOlmi's Avatar
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    Different loops type. Speed test script

    How fast are thinBasic loops? Here the answer.

     '-----------------------------------------------------------------------------
     'Variable declaration
     '-----------------------------------------------------------------------------
     Dim T0, T1, T2, T3, T4, T9 AS quad
    
     DIM MaxLoops  AS LONG VALUE 100000
     DIM Count   AS LONG
     DIM tmpNumber AS QUAD
     DIM tmpString AS STRING
     DIM Message  AS STRING
     DIM tFormat  AS STRING VALUE "#0"
    
     '-----------------------------------------------------------------------------
     'Confirm script execution
     '-----------------------------------------------------------------------------
     Message = "This program will perform:\n"
     Message += "" & MaxLoops & " FOR\n"
     Message += "" & MaxLoops & " WHILE/WEND\n"
     Message += "" & MaxLoops & " DO/LOOP WHILE\n"
     Message += "" & MaxLoops & " DO/LOOP UNTIL\n"
     Message += "Please press Yes to go on, NO to Stop\n"
    
     DIM lResult AS LONG = MSGBOX(0, Message, %MB_YESNO, "Continue?") 
     IF lResult <> %IDYES THEN
      STOP
     END IF
    
     T0 = GetTickCount
     
     '-----------------------------------------------------------------------------
     'Test speed: FOR loop
     '-----------------------------------------------------------------------------
     T1 = GetTickCount
     tmpNumber = 2
     FOR Count = 1 TO MaxLoops
      tmpNumber += 1
      tmpNumber = (tmpNumber * 2) ^ 2
      tmpNumber = 2
     NEXT
     
     '-----------------------------------------------------------------------------
     'Test speed: WHILE loop
     '-----------------------------------------------------------------------------
     T2 = GetTickCount
     Count = 0
     tmpString = ""
     tmpNumber = 2
     WHILE Count < MaxLoops
      Count += 1
      tmpNumber = (tmpNumber * 2) ^ 2
      tmpNumber = 2
     WEND
     
     '-----------------------------------------------------------------------------
     'Test speed: DO loop WHILE
     '-----------------------------------------------------------------------------
     T3 = GetTickCount
     Count = 0
     tmpString = ""
     tmpNumber = 2
     DO
      Count += 1
      tmpNumber = (tmpNumber * 2) ^ 2
      tmpNumber = 2
     LOOP WHILE Count < MaxLoops
    
     '-----------------------------------------------------------------------------
     'Test speed: DO loop UNTIL
     '-----------------------------------------------------------------------------
     T4 = GetTickCount
     Count = 0
     tmpString = ""
     tmpNumber = 2
     DO
      Count += 1
      tmpNumber = (tmpNumber * 2) ^ 2
      tmpNumber = 2
     LOOP UNTIL Count >= MaxLoops
    
     T9 = GetTickCount
     
     '-----------------------------------------------------------------------------
     'Show results with some internal counters
     '-----------------------------------------------------------------------------
     Message = "Test " & MaxLoops & " loops." & $CRLF
     Message += MaxLoops & " FOR"    & $tab & FORMAT$(T2 - T1, tFormat)      & " msec." & $CRLF
     Message += MaxLoops & " WHILE"   & $tab & FORMAT$(T3 - T2, tFormat)      & " msec." & $CRLF 
     Message += MaxLoops & " DO WHILE" & $tab & FORMAT$(T4 - T3, tFormat)      & " msec." & $CRLF
     Message += MaxLoops & " DO UNTIL" & $tab & FORMAT$(T9 - T4, tFormat)      & " msec." & $CRLF
     Message += "Total    "     & $tab & FORMAT$(T9 - T0, tFormat)      & " msec." & $CRLF
     Message += "Final message"     & $tab & FORMAT$(GetTickCount - T9, tFormat) & " msec." & $CRLF
    
     MSGBOX(0, Message)
    
    Last edited by ErosOlmi; 08-02-2024 at 19:48.
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  2. #2
    thinBasic MVPs kryton9's Avatar
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    Re: Different loops type. Speed test script

    Clever test Eros. I was surprised by how much faster the do while loops were compared to the good old for loop.
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  3. #3
    thinBasic author ErosOlmi's Avatar
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    Re: Different loops type. Speed test script

    Ken,

    all those types of loop are managed internally by thinBasic core in different way.
    What is best mostly depend by the processor and how thinBasic techniques best fits processor characteristics.
    For example in my tests FOR/NEXT is always the best. If in your tests on AMD it is not it means the technique used is not the best on AMD processors.
    Every processor manufacturer has different tips and tricks to get the max from theyr toys I suppose

    In any case I think we are talking about few milliseconds difference

    Ciao
    Eros
    www.thinbasic.com | www.thinbasic.com/community/ | help.thinbasic.com
    Windows 10 Pro for Workstations 64bit - 32 GB - Intel(R) Xeon(R) W-10855M CPU @ 2.80GHz - NVIDIA Quadro RTX 3000

  4. #4
    Have you observed significant variations in loop execution speed across different types, and do you think these differences are influenced by processor characteristics?

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