How to optimize a big Visual Basic application (Memory/GDI) ?
Posted on 2003-11-16
We are writing a large-scale visual basic application.
The application consists of many ActiveX DLLs and OCXs written in VB.
This is a 2-tier application working through ADO to Oracle.
Being in the last round before delivering the software we are facing a big problem with the following issues:
1. Needed memory is somewhere around 400MB and more (most of the time it goes up, not down).
2. To many GDI objects, that cause the system to fail under Win2K Professional at ~10,000 GDI objects and under Win2K Server (our target platform) at ~6,000 GDI objects.
We also have some problems with the speed of the application...but these are being discovered without much trouble now and then.
We have searched through the Internet and asked a few companies for help with tools that can point our problems without any success.
The tools we used are:
1. AppSight by Identify - this tool doesn't involve any memory mapping.
2. DevPartner by NuMega - Fails to run our application.
3. PurifyPlus by Rational - Successfully runs the application, but doesn't give good mapping of objects, only DLLs, and being targeted to C++ the information is not very clear about the places that the memory is being allocated (described as VB runtime DLLs, and system DLLs).
Anyway, what I need is this...
We need a tool that works well with Visual Basic and can run our BIG application, while providing us with the information about each and every memory allocation made.
Also, we need that the tool will map all the objects that our application created including their occupied memory and link it to our source files.
As for our second issue (the GDI objects problem), we need the to point the creation and destruction of the GDI objects in our source code, as well as the mapping of the current situation.
I suppose that when we have these tools (that might have more useful features), we could pin point the problematic areas and objects, and take care of our application.
And to the question(s)...
1. Do you know such tools?
2. Did you face these problems and find a solution? What was the solution? How did you find it?