Using Intel VTune Amplifier XE and Inspector XE in.net environment

Transcription

1 Using Intel VTune Amplifier XE and Inspector XE in.net environment Levent Akyil Technical Computing, Analyzers and Runtime Software and Services group 1

2 Refresher - Intel VTune Amplifier XE Intel Inspector XE 2

3 Intel VTune Amplifier XE Performance Profiler Where is my application Spending Time? Wasting Time? Waiting Too Long? Focus tuning on functions taking time See call stacks See time on source Windows & Linux Low overhead No special recompiles See cache misses on your source See functions sorted by # of cache misses See locks by wait time Red/Green for CPU utilization during wait Advanced Profiling For Scalable Multicore Performance 3

4 Intel VTune Amplifier XE Tune Applications for Scalable Multicore Performance Fast, Accurate Performance Profiles Hotspot (Statistical call tree) Hardware-Event Based Sampling Thread Profiling Visualize thread interactions on timeline Balance workloads Compatible Microsoft, GCC, Intel compilers C/C++, Fortran, Assembly,.NET Latest Intel processors and compatible processors 1 Windows or Linux Visual Studio Integration (Windows) Standalone user i/f and command line 32 and 64-bit 1 IA32 and Intel 64 architectures. Many features work with compatible processors. Event based sampling requires a genuine Intel Processor. 4

5 Intel VTune Amplifier XE Easy Predefined Performance Profiles Quickly Select an Analysis Type 1 2 Click New Analysis Select an Analysis Type Hotspots Which functions use the most time? Click [+] for the call stack. Double click to see the source. Concurrency Colors show the number of cores used. Add parallelism for hotspots with poor concurrency. Locks and Waits Waiting a long time on a lock is bad if the cores are underutilized during the wait. 5

6 Intel VTune Amplifier XE Powerful EBS Made Easier System Wide Event Based Sampling (EBS) uses the on chip PMU to count performance events like cache misses, clock ticks and instructions retired. Predefined EBS Profiles Easy EBS setup for newer processors. No memorizing complex event names. Profiles vary by microarchitecture. (Full custom profiles also available) Opportunities Highlighted General Exploration turns the cell pink when it suspects a tuning opportunity is present. Hover gives suggestions. Pinpoint tuning opportunities See opportunities like cache misses. View results on the timeline, in the grid view or on your source. Every Intel Processor has an on chip Performance Monitoring Unit (PMU). 6

7 Double Click from Grid or Timeline See Profile Data On Source / Asm Time on Source / Asm Quick Asm navigation: Select source to highlight Asm Quickly scroll to hot spots. Scroll Bar Heat Map is an overview of hot spots Intel VTune Amplifier XE Right click for instruction reference manual Click jump to scroll Asm 7

8 Intel VTune Amplifier XE Filter Data - Get Actionable Information Frame Analysis Analyze Long Latency Activity Frame: a region executed repeatedly API marks start and finish Examples: for and while loops Game Compute next graphics frame Simulator Time step loop Computation Convergence loop 8

9 Intel VTune Amplifier XE Find Slow Frames With One Click (1) Regroup Data Result: (Partial list shown) 9

10 Intel VTune Amplifier XE Algorithmic Analysis Frame Analysis Fast Good Slow Frames / iterations 10

11 Just 2 more clicks shows where to focus tuning Slow functions in slow frames (1) Only show slow frames Result: Functions taking a lot of time in slow frames (2) Regroup: Show functions 11

12 Profile a Running Application No need to stop and re-launch the app when profiling Two Techniques: Attach to Process: Hotspot Concurrency Locks & Waits Profile System: Lightweight Hotspots Advanced & Custom EBS Optional: Filter by process after collection 12

13 Intel VTune Amplifier XE Compare Results Quickly - Sort By Difference Quickly identify cause of regressions. Run a command line analysis daily Identify the function responsible so you know who to alert Compare 2 optimizations What improved? Compare 2 systems What didn t speed up as much? 13

14 Windows & Linux Versions Available Stand-alone GUI, Command line, Visual Studio Integration Microsoft Windows* OS Windows XP*, Windows Vista*, Windows 7* Windows Server* 2003, 2008 Integration with Microsoft Visual Studio* 2005, 2008 and 2010 Standalone GUI and command line IA32 and Intel 64 Linux* OS RHEL*, Fedora*, SUSE*, CentOS*, Ubuntu* Additional distributions may also work Standalone GUI and command line IA32 and Intel 64 Single user and floating licenses available 14

15 Refresher Intel VTune Amplifier XE Intel Inspector XE 15

16 Intel Inspector XE Move correctness analysis earlier in the design cycle Where are my application s Memory Errors Threading Errors Security Errors Invalid Accesses Memory Leaks Uninitialized Memory Accesses Races Deadlocks Cross Stack References Buffer overflows and underflows Incorrect pointer usage Over 250 error types Workflow for developers Multiple tools common i/f Windows* & Linux* "Having such a tool this early in the development stage frees the validation from trivial bug reports and gives our engineers the opportunity to code more efficiently from the very beginning of the product cycle." Jean Kypreos Advanced Video Processing Team Manager Envivio Developer friendly tools help you find errors earlier 16

17 Dynamic Analysis Detects memory and threading errors Memory errors Invalid Memory Accesses Memory Leaks Uninitialized Memory Accesses Improper usage of Memory APIs Resource Leaks (Windows only) Threading Errors Data Races Deadlock/Lock Hierarchy Violation Cross Stack Memory Accesses Use your normal build & compiler (dynamic binary instrumentation) Analyze DLLs/SOs (source optional) Runs threaded if app threaded Requires a workload (app is run) 32 and 64-bit OSs API for custom mem. allocators Easy user interface + cmd line 17

18 Static Analysis Detects over 250 different kinds of errors and security risks Coding Errors (partial list) Memory and resource leaks Incorrect OpenMP*/Intel Cilk directives Pointer and array errors Security Errors (partial list) Buffer overflows and underflows Uninitialized variables and objects Incorrect pointer usage Misuse of string, memory formatting libs Global analysis crosses subroutine and file boundaries No compiler change required - Existing compiler for code generation - Intel compiler front end for static analysis No workload required (app is not run) Fast (compared to dynamic analysis) Every developer can run SSA (no central server, it is like a regular build) Easy user interface + cmd line Static Analysis is included in Parallel Studio XE studio bundles. It is not sold separately. 18

19 Static & Dynamic Analysis Complement Each Other Dynamic Analysis Memory & Threading Errors Static Analysis Memory, Code & Security Errors Slow (1x 20x - 100x workload) Workload must exercise path (does not need to cause a program error) Fewer false errors only on real paths No source required check DLLs/SOs Use your normal compiler Use your current build - No rebuild (debug build with symbols recommended) Fast (app is not run) All paths checked More errors we rank by risk Source required No compiler change required - Existing compiler for code generation - Intel compiler front end for static analysis No central server to set up Just create a build for static analysis - Auto setup available in Visual Studio Both reduce total lifecycle costs Requires Parallel Studio XE SP1 19

20 Intel VTune Amplifier XE and Inspector XE Current.NET support Support the analysis of pure.net applications as well as mixed applications that contain both managed and unmanaged code Inspector XE detects potential deadlocks and data races in.net programs object allocations and accesses to shared memory on the garbage-collected heap the static data areas and flags unsynchronized accesses (at least one of which is a write operation) of multiple threads to the same object/class data member as a potential data race 20

21 Intel VTune Amplifier XE and Inspector XE Current.NET support Support the analysis of pure.net applications as well as mixed applications that contain both managed and unmanaged code VTune Amplifier XE helps developers in fine-tuning serial and parallel applications for optimal performance in their pure.net or mixed applications. analyze and visualize the work distribution between threads as well as thread synchronization points identify work distribution problems and excessive threads synchronization which prevents parallel execution identify micro-architectural performance issues and identify the architectural bottlenecks on a given Intel processor. 21

22 Intel VTune Amplifier XE and Inspector XE Tune applications that mix C++ and C# See analysis results on your C# and C++ source Results mapped to your symbols Mixed mode stack walking (View stacks that mix C++ and C#).NET* 2.0, 3.0, 4.0 Tuning bottlenecks in pure C# may also require additional profiling tools to analyze things like garbage collection New.NET 4.0 sync APIs and task APIs are not supported. ASP.NET is not supported. 22

23 Demo - Intel VTune Amplifier XE Intel Inspector XE 23

24 Upcoming features VTune Amplifier XE

25 VTune Amplifier XE 2013 Beta Features Brand new 2013 features Windows 8 and Visual Studio* 11 Intel MIC Support Event-based Sampling with Stacks Statistical Call Count collection Task Analysis Total time analysis in command line gprof-compatible report Java* Support OpenCL* support Previously released new features Inline function support Bandwidth analysis 25

26 Hardware Event-based Sampling (EBS) with Call Stacks When collecting EBS data, turn on the Collect stacks box Call stacks for the EBS data will be collected 26

27 Statistical Call Count collection Statistical call count is supported in 2013 beta version 27

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29 Legal Disclaimer & Optimization Notice INFORMATION IN THIS DOCUMENT IS PROVIDED AS IS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO THIS INFORMATION INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Performance tests and ratings are measured using specific computer systems and/or components and reflect the approximate performance of Intel products as measured by those tests. Any difference in system hardware or software design or configuration may affect actual performance. Buyers should consult other sources of information to evaluate the performance of systems or components they are considering purchasing. For more information on performance tests and on the performance of Intel products, reference Copyright, Intel Corporation. All rights reserved. Intel, the Intel logo, Xeon, Core, VTune, and Cilk are trademarks of Intel Corporation in the U.S. and other countries. *Other names and brands may be claimed as the property of others. Optimization Notice Intel s compilers may or may not optimize to the same degree for non-intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice. Notice revision #