Intel® 64 and IA-32 Architectures Optimization Reference Manual

MULTICORE AND HYPER-THREADING TECHNOLOGY8.2.4.3 Supporting Development ToolsIntel ® Threading Analysis Tools include Intel ® Thread Checker and Intel ® ThreadProfiler.8.2.4.4 Intel ® Thread CheckerUse Intel Thread Checker to find threading errors (which include data races, stallsand deadlocks) and reduce the amount of time spent debugging threaded applications.Intel Thread Checker product is an Intel VTune Performance Analyzer plug-in datacollector that executes a program and automatically locates threading errors. As theprogram runs, Intel Thread Checker monitors memory accesses and other eventsand automatically detects situations which could cause unpredictable threadingrelatedresults.8.2.4.5 Thread ProfilerThread Profiler is a plug-in data collector for the Intel VTune Performance Analyzer.Use it to analyze threading performance and identify parallel performance bottlenecks.It graphically illustrates what each thread is doing at various levels of detailusing a hierarchical summary. It can identify inactive threads, critical paths andimbalances in thread execution. Data is collapsed into relevant summaries, sorted toidentify parallel regions or loops that require attention.8.3 OPTIMIZATION GUIDELINESThis section summarizes optimization guidelines for tuning multithreaded applications.Five areas are listed (in order of importance):• Thread synchronization• Bus utilization• Memory optimization• Front end optimization• Execution resource optimizationPractices associated with each area are listed in this section. Guidelines for each areaare discussed in greater depth in sections that follow.Most of the coding recommendations improve performance scaling with processorcores; and scaling due to HT Technology. Techniques that apply to only one environmentare noted.8-11