INDUSTRIAL PROJECT (234313) ULTRASOUND SCANNER EMBEDDED ONLINE PROFILER Students: Liat Peterfreund, Hagay Myr Supervisor: Mr. Tomer Gal (GE Healthcare)

Project Objectives  Implement a statistical profiler for an Ultrasound- System (ULS) software that its results will be used for debugging and optimizations.  The target platforms are already deployed systems, means – not in a debug-able environment.  The profiler should have minimum impact on the examined process and should work efficiently and quickly.

Methodology  Sampling (halting) the process every pre-defined time interval  Collecting call-stacks frames of all the process’ threads in every sample  Analyzing the information – resolving the collected frames into their symbols and providing the actual Profiling information.

Profiler Overview (1)  The user sets-up the profiling session:  Profiled process  Running process – by its PID or its exact name  New process – by the full path of an executable  Profiling session duration  Profiling session start delay  Time interval between samples  Stack depth to be examined  Minimal thread runtime (threshold) – below it the thread won’t be examined  The profiler is then activated and starts to collect the Call-Stacks of all the process’ threads.  After collecting the samples, the profiler analyzes the information  Resolves the symbols of all the gathered stack-frames  Calculates the profiling info for each symbol  Relative part of his net runtime (without his sons) out of the total activation time  Relative part of his sons’ total runtime out of the total activation time

Profiler Overview (2)  The profiling mechanism is built of three threads :  Main thread – the thread which sets-up, controls and analyzes the profiling session  Breaker thread – sends the analyzed process an Exception- Debug-Event of type Breakpoint in a pre-defined frequency  Listener thread – listens for Debug-Events from the analyzed process and reacts accordingly to fulfill the following:  Maintain the process’ active threads list (Create-Thread and Exit- Thread events)  Collect the call-stacks frames of the active threads (Breakpoint- Exception events)

Achievements since Midterm (1)  Optimized performance  Internal console prints at a later time  Threshold of minimum activeness of a thread  Threads that haven’t been active at all between two consecutive samples are ignored  Improved analysis  Symbols resolving with cache (for future extensions)  The entire stack as the key for analysis  Portable implementation  DLL, LIB and H files to be used by any application

Achievements since Midterm (2)  UI support  There is a well defined protocol between UI and the profiler  The client applications inherits the provided ProfilerClient interface.  The client application registers itself with the profiler  The client gets an event from the profiler when there is a incoming message.  Our GUI uses polling instead of the above mechanism due to compatibility problem between managed and unmanaged syntax

Achievements All-Together  Fully functional, optimized and deployable Profiler  Can be integrated into any developed software  Shared library (DLL) to be linked with the developed application  Can be used as an independent analysis tool  Console tool  GUI tool (an extra capability)  Windows Form Application  Provides a full setup and control interface  Views the statistics in a convenient tree-like grid  Can be used both in the factory and on the field to analyze, debug and improve the ULS system’s software  Presumably will be deployed with future releases of the ULS software

Demonstration  Lets profile stuff…

Conclusions  The course exposed us to GE Healthcare company  We were given a tour in the GE Healthcare factory, were introduced with both the engineers and the products, from legacy to most recent ultrasound systems  The course exposed us to new technologies and environments  Windows API and Windows Debugging API  Windows Form Application  The course improved our skills as software engineers  Improved design and coding skills  Keep to schedule – deliver what was expected and on time  Teamwork – parallelization of the development

The End Thanks !