B4J Question Debug mode is much slower than Release mode when using resumable subs

xulihang · Jun 5, 2019

I found that the debug mode is very slow when testing the project which I have uploaded at this thread:
https://www.b4x.com/android/forum/t...en-many-subs-are-stringed.106328/#post-665791

The result of processing a novel:

Debug Mode

B4X:

Waiting for debugger to connect...
Program started.
A3 Start
start time: 10:12:28
end time: 10:13:11
A3 End

Release Mode

B4X:

A3 Start
start time: 10:35:36
end time: 10:35:42
A3 End

xulihang · Jun 5, 2019

Tested again on B4J 7.32. It is faster than the previous test. As this is debug mode, perhaps this result is reasonable. And it is an indication that my code needs optimization.

B4X:

Waiting for debugger to connect...
Program started.
A3 Start
start time: 12:30:10
end time: 12:30:38
A3 End

Erel · Jun 5, 2019

There were many improvements to the debugger in the recent versions. Still, you should never test performance in debug mode. The results are meaningless.

MarkusR · Jun 6, 2019

you should not use Dim inside a loop, it would create a new class object that is mostly unnecessary.

simple example:
at i 1,2,3 the output of a is empty

B4X:

Sub Test
   
    Dim i As Int
    For i = 0 To 3
        Dim a As String
        If i=0 Then a= "Hallo"
        Log(i)
        Log(a)
    Next
   
End Sub

about optimization,
count which sub is most used, also check which sub take the most time.

B4J Question Debug mode is much slower than Release mode when using resumable subs

xulihang

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xulihang

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Erel

B4X founder

MarkusR

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B4J Question Debug mode is much slower than Release mode when using resumable subs

xulihang

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xulihang

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