Android Question Why my prg it's fast in debugging and slow in release?

gigi0ne · Mar 31, 2014

hi, first.. sorry for my english.. it's terrible.. i know...

i have write my first program in b4a for use them in my restaurant. all it's ok, the program use the mysql db from my server via wifi and on debug release it's very fast.

when i compile the program in release mode.... the response from db it's very slow.. 2 or 3 seconds for 10 record.

Erel have you any idea?

i use a php with json (adapted from mysql example)

thank's
Luigi

eps · Mar 31, 2014

I would put some logging in place to work out where the slowdown is occurring. So log the current time in a few places.

Erel · Mar 31, 2014

Maybe it is related to the fact that in debug mode there is always network activity (between the IDE and device). Try to send several requests and see whether all of them are slow.

DonManfred · Mar 31, 2014

He said in RELEASE mode it is slow. While debugging it is fast.

eps · Mar 31, 2014

You are going to have to work out where it's slow and then try to pinpoint the reason.

Erel · Mar 31, 2014

DonManfred said:
He said in RELEASE mode it is slow. While debugging it is fast.

The debugger network activity is light. As a bonus it prevents the device from turning the wifi power down to preserve battery.

I don't know whether this is the real cause of the slowness in this case. However the network latency of an active device is a few milliseconds and of an inactive device can be ~500ms.

gigi0ne · Mar 31, 2014

Find.... (the part of program incriminated..)

B4X:

    x = DateTime.Now
    If File.Exists(File.DirAssets, IM) Then
        L_Bitmap.Initialize(File.DirAssets,IM)
    Else
      L_Bitmap.Initialize(File.DirAssets,"default.png")
    End If
    Log("Create item End: " & (DateTime.Now-x))

on DEBUG from 9 to 20 ms

on RELEASE from 249 to 301 ms

Why?
thank's
Luigi

eps · Mar 31, 2014

Maybe the Debug version doesn't do something that the Release version does, hence the slowdown? Is this in the Activity_Create sub? Can you please use the code tags on your code, it makes it a lot easier to read.

gigi0ne · Mar 31, 2014

eps said:
Maybe the Debug version doesn't do something that the Release version does, hence the slowdown? Is this in the Activity_Create sub?

no... or yes and no.... it's on sub called from Activity_Create and other sub

Erel · Apr 1, 2014

That explains it.

The rapid debugger doesn't store the assets files inside the APK. This is a new feature named virtual assets folder. It allows the debugger to deploy your app with only the updated files. Loading images from the APK is slower than loading images from the external storage.

Make sure to load each bitmap once. For example in your code it can load the default image many times.

gigi0ne · Apr 1, 2014

ok.. i have try in this mode

B4X:

    x = DateTime.Now
    FN = IMG&".png"
    If MCache.IsOnDisk(IMG) Then
        L_Bitmap = MCache.GetBitmap(IMG,True)
    Else
        If File.Exists(File.DirAssets, FN) Then
                  L_Bitmap.Initialize(File.DirAssets,FN)
            MCache.PutBitmapOnDisk(IMG, L_Bitmap,"PNG",100)
        Else
              If MCache.IsOnDisk("default") Then
                    L_Bitmap = MCache.GetBitmap("default",True)
            Else
                  L_Bitmap.Initialize(File.DirAssets,"default.png")
                    MCache.PutBitmapOnDisk("default", L_Bitmap,"PNG",100)
            End If     
          End If   
    End If
    Log("Create item End: " & (DateTime.Now-x))

Same problem, in debug fro 1 to 10 msec in release from 200 to 300 ms
Log say

From memory cache: default
Create item end: 248

have you any idea?

thank's Luigi

Erel · Apr 2, 2014

It is not a real problem. It is faster in debug mode because the files are not read from the APK but directly from the file system.

gigi0ne · Apr 2, 2014

Erel said:
It is not a real problem. It is faster in debug mode because the files are not read from the APK but directly from the file system.

ok... i understand this... but if i put the file in cache.. why it's slow?
the image isn't ready from apk but from memory cache...

Erel · Apr 2, 2014

I'm not familiar with this library so I'm not sure that you are using it correctly. Note that you can use a simple Map to load the bitmaps once.

If there are many images then it will still be slower as it needs to load them once from the APK.

gigi0ne · Apr 2, 2014

Erel, Thank you so much for the fast responses and for the patience that you have.
I'm new to both of your program and basi (I am an old man who started with the machine language and then switched to C++ and Delphi)
can you post a small example of how to use the maps for the images?
thanks

Erel · Apr 3, 2014

Something like:

B4X:

Sub Process_Globals
 Dim images As Map
End Sub

Sub Activity_Create (FirstTime As Boolean)
 If FirstTime Then
  images.Initialize
 End If
...

Sub LoadAssetsImage(img As String)
 If images.ContainsKey(img) Then
  Return images.Get(img)
 Else
  Dim i As Bitmap = LoadBitmap(File.DirAssets, img)
  images.put(img, i)
  Return i
 End If
End Sub

gigi0ne · Apr 3, 2014

Erel said:

Something like:

B4X:

Sub Process_Globals
Dim images As Map
End Sub

Sub Activity_Create (FirstTime As Boolean)
If FirstTime Then
  images.Initialize
End If
...

Sub LoadAssetsImage(img As String)
If images.ContainsKey(img) Then
  Return images.Get(img)
Else
  Dim i As Bitmap = LoadBitmap(File.DirAssets, img)
  images.put(img, i)
  Return i
End If
End Sub

Thank's

Android Question Why my prg it's fast in debugging and slow in release?

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