Intel® 64 and IA-32 Architectures Optimization Reference Manual

APPLICATION PERFORMANCE TOOLSprogram. However, it can reduce performance. The VTune analyzer can detectmodules as they are loaded by the operating system, and instrument them at runtime.Call graph can be used to profile Win32*, Java*, and Microsoft.NET* applications.Call graph only works for application (ring 3) software.Call graph profiling provides the following information on the functions called by yourapplication: total time, self-time, total wait time, wait time, callers, callees, and thenumber of calls. This data is displayed using three different views: functionsummary, call graph, and call list. These views are all synchronized.The Function Summary View can be used to focus the data displayed in the call graphand call list views. This view displays all the information about the functions called byyour application in a sortable table format. However, it does not provide callee andcaller information. It just provides timing information and number of times a functionis called.The Call Graph View depicts the caller/callee relationships. Each thread in the applicationis the root of a call tree. Each node (box) in the call tree represents a function.Each edge (line with an arrow) connecting two nodes represents the call from theparent to the child function. If the mouse pointer is hovered over a node, a tool tipwill pop up displaying the function's timing information.The Call List View is useful for analyzing programs with large, complex call trees.This view displays only the caller and callee information for the single function thatyou select in the Function Summary View. The data is displayed in a table format.A.2.3Counter MonitorCounter monitor helps you identify system level performance bottlenecks. It periodicallypolls software and hardware performance counters. The performance counterdata can help you understand how your application is impacting the performance ofthe computer's various subsystems. Counter monitor data can be displayed in realtimeand logged to a file. The VTune analyzer can also correlate performance counterdata with sampling data. This feature is only available in the Windows version of theVTune AnalyzerA.3 INTEL ® PERFORMANCE LIBRARIESThe Intel Performance Library family contains a variety of specialized libraries whichhas been optimized for performance on Intel processors. These optimizations takeadvantage of appropriate architectural features, including MMX technology,Streaming SIMD Extensions (SSE), Streaming SIMD Extensions 2 (SSE2) andStreaming SIMD Extensions 3 (SSE3). The library set includes the Intel Math KernelLibrary (MKL) and the Intel Integrated Performance Primitives (IPP).• The Intel Math Kernel Library for Linux and Windows: MKL is composed of highlyoptimized mathematical functions for engineering, scientific and financial applicationsrequiring high performance on Intel platforms. The functional areas of theA-12