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VTune: Intel’s Visual Tuning Environment

VTune: Intel’s Visual Tuning Environment. K. Sridharan, VTune Development Manager. What is VTune?. VTune is a performance tuning environment for Windows™ developers from Intel. VTune is now bundled with: Intel C/C++ and FORTRAN compilers Intel Performance Library Suite

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VTune: Intel’s Visual Tuning Environment

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  1. VTune: Intel’s Visual Tuning Environment K. Sridharan, VTune Development Manager

  2. What is VTune? • VTune is a performance tuning environment for Windows™ developers from Intel. • VTune is now bundled with: • Intel C/C++ and FORTRAN compilers • Intel Performance Library Suite • Intel Architecture tutorials, Processor Manuals and Computer Based Training Materials. Intel Corporation

  3. Overview of VTune • VTune is a Performance tuning tool for Windows 95 and NT* developers to: • Monitor the performance of all active software. • Identify “HotSpots” in a program and analyze its performance as it executes on an Intel Architecture microprocessor platform. • Examine each instruction and uncover problems at machine code level. • Help optimize code using context-sensitive on-line tuning suggestions. Intel Corporation

  4. Time-Based Sampling • A periodic interrupt drives the Sampling • Interrupt sources can be VTD, RTC or NMI*. • Sample data stored in buffer until its full. • Buffer flush disables sampling during write. • Analyze the sampling data. • Data consists of cs:eip and module name data. • Match addresses with an application or OS routine. • Sampling data stored in Access 7.0 DB. • Easy to import Sampling data into Excel. Intel Corporation

  5. Event-Based Sampling on Pentium®Pro Processor • CPU Events report on internal CPU states. • Event Sampling enabled by CPU and APIC • VTune helps manage the choices • Data Cache Misses • Partial Stall Counts • Branch Statistics • Mispredictions and Total Branches Taken • Clock Count Statistics Intel Corporation

  6. HotSpot Analysis • From the System-wide view, you can zoom into a specific module of interest. • Display all of the HotSpots organized by functions in the module, memory locations, class names and source files. • For each HotSpot, VTune displays the symbol name, address, and the number of samples collected. • For detailed information, double click on a HotSpot to open a source code or assembly view. The HotSpot view helps you to identify sections in your code that take the most CPU time and that have potential performance problems. Intel Corporation

  7. Static Analysis • Shows performance information by instruction • Target machine can be different than Host machine. • Indicates pairing on Pentium® processor, decoder groups on PentiumPro Processor. • Shows penalties incurred by the instruction. • Shows execution clocks or micro-ops. • Disassembly fits into a Portal which can be moved or enlarged. Size of Portal affects speed of analysis. Intel Corporation

  8. Dynamic Analysis • Assists in pin-pointing the issues identified by sampling or static analysis. • Uses advanced simulator technology to run, trace and simulate your actual code in one step • Fine-tune performance attributes of key sections of your code, such as: • Cache behavior analysis • Branch Prediction results Intel Corporation

  9. VTune’s Code Coaches • C and Fortran Code Coaches offer specific suggestions on the modifications to improve performance; Examples: • Loop interchange and loop Invariant code motion • Converts from scalar to mmx using intrinsics calls • Traversing an array/list: binary search, hash tables • Consider using MMX(tm) technology • Consider using Intel’s Performance Libraries. Intel Corporation

  10. Intel Compiler Strategy • Intel’s compilers track Intel microprocessor improvements • Available as a plug in extension to the “Microsoft Developer’s Studio” Intel Corporation

  11. Compiler Performance Features • Profile guided optimizations • Floating point optimizations • Floating point alignment • MMX™ Technology Intel Corporation

  12. Intel Performance Library Suite • Signal Processing Library V3.0 • DSP, Filtering, Transform and Telephony • Recognition Primitives Library V3.0 • Voice/Speech Recognition and Processing • Image Processing Library V1.0 Beta • Photo Editing, Enhancement and Transform • Math Kernel Library V2.0 • Scientific and Technical Computation Intel Corporation

  13. Why Use Intel’s Performance Libraries ? • Highly optimized for performance • Alternative for code development • Stay current with the latest Intel Architectures • High level programming language interface • Reduce development effort Intel Corporation

  14. VTune Coming Attractions • VTune Support For Java: • First release is VTune 2.5: • view performance in every component: including Java class files • call graph • working with major vendors. • Beta this month. Intel Corporation

  15. VTune Coming Attractions • VTune 3.0 • Beta later this year. • All OS events (Perfmon) and Events over time • Process, Processor Views. • Call graph • Memory Pattern Analysis • C++/ASM coach • Dynamic Analysis for PII Intel Corporation

  16. Backup Slides

  17. Key Features:Code Analysis of binary files • Perform code analysis without the need to create an executable and sample. • Accepts .exe, .dll or .obj files. • Zoom into source code by double-clicking on the desired function from the summary. • If no source code is available, the binary is disassembled. Intel Corporation

  18. Source View • C/C++, FTN or Assembly or ?? displayed. • Sample times shown by source line. • Source and disassembly can be intermixed. • Any of these file types can supply symbol and line number information: • .SYM, .HDR, .DMP, .DBG, .MAP, .PDB , C7/CV (NB09), NB10, NB11, FB09, FB0A, DWARF 2. Intel Corporation

  19. Libraries Platform Support • 32-bit operating system (Microsoft* Win 95 and Microsoft* Win NT) • Compiler support • Multi-Media Libraries (DLLs and Static Libraries) • Intel C/C++ Compiler Plug-in • MSVC/C++ V4.x • Borland V5.0 • Math Kernel Library (Static Libraries) • Intel Fortran 77 Compiler • Microsoft Powerstation Fortran V4.0 • Watcom Fortran 77 V10.6 Intel Corporation

  20. Multi-Media Library Features • High performance • Optimized processor specific DLLs and static libraries for : • Intel 486 TM • Pentium® Processor • Pentium® Processor with MMXTM Technology • Pentium® Pro Processor • Pentium® II Processor • Scalable architecture • Processor detection and processor specific DLL loading • C-Callable programming interface • Support for integer and floating point data • Custom DLL Builder for minimum memory footprint Intel Corporation

  21. Math Kernel Library • Workstation technical computing library • Basic Linear Algebra Subroutines (BLAS) • Single and double precision FFTs • Main features • Optimized kernels at every level of BLAS • Level 3 BLAS multithreaded - performance scales on SMP systems • Optimized for Pentium® Pro Processor • Interfaces to several FORTRAN compilers • Static libraries • DLL will be available Intel Corporation

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