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VTune™ Performance Analyzer 6.0 PowerPoint PPT Presentation


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VTune™ Performance Analyzer 6.0. 目标. 能够使用 VTune 分析 软件的性能瓶颈. AGENDA. Introduction Terminology Sampling Call Graph Counter Monitor VTune on Linux. VTune ™ Performance Analyzer. 帮助你找出性能方面问题 Bottlenecks in algorithms Bottlenecks due to data layout Application architecture bottlenecks

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VTune™ Performance Analyzer 6.0

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VTune™ Performance Analyzer 6.0


目标

能够使用VTune分析

软件的性能瓶颈


AGENDA

  • Introduction

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linux


VTune™ Performance Analyzer

帮助你找出性能方面问题

  • Bottlenecks in algorithms

  • Bottlenecks due to data layout

  • Application architecture bottlenecks

  • System-Level and hardware bottlenecks


AGENDA

  • Introduction

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linux


什么是 Hotspot?

  • Where in an application/system where there is a significant amount of activity(有大量活动发生的地方)

    • Where = address in memory => OS process => OS thread => executable file or Module => user function (requires symbols) => line of source code (requires symbols with line numbers) or processor (assembly) instruction.(定位到指令)

    • Significant= if it doesn’t happen often it probably doesn’t have much impact on the system’s performance.

    • Activity= time spent or other internal processor event.


什么是Hotspot?

  • hotspot是你的代码花费很长时间执行的区域。

  • 通过定位hotspot,VTune性能分析工具可以帮助你分析应用程序的性能。

  • 但是简单的知道hotspot的位置是不够的,你必须知道什么导致hotspot的产生,怎样改进

  • 通过对热区的进一步分析,你可以跟踪关键的函数调用,监控特殊的处理器事件,如cache miss


Hotspot与Bottleneck的区别

  • Bottleneck是系统中性能受到约束的位置

  • VTune™ Performance Analyzer帮助你找到并删除Bottlenecks.

  • 找到软件Hotspots是一个分析方法,帮助你定位Bottlenecks.


性能优化方法


三种数据收集器

  • sampling

  • call graph

  • counter monitor


Two Ways toTrack Location

  • Problem:我需要知道你在哪花费了多长时间

  • Statistical Solution:我每30分钟呼叫你

  • Instrumentation Solution:每个地方有一个特殊的电话点,你每到一个地点向我报告


The Statistical Solution: I Call You!

  • ADVANTAGES:

    • 低开销: 没有太多的中断

    • 没有建站点的开销

    • 无论你在那里都能精确定位

  • DISADVANTAGES:

    • 如果你的双手拿满东西,我必须等待

    • 你可能第一次没有听到铃声,所以我不能精确确定我呼叫你时,你在那里

由于你不经常去有一些地方,我可能根本不知道你去过


The Instrumentation Solution: You call me when you get there!

  • ADVANTAGES:

    • 你到达新的地方我能立刻知道

    • 我知道你在一个地方呆了多长时间

    • 我知道你到达同一个地方多少次

  • DISADVANTAGES:

    • 不知道你在街道内做了什么

    • 粒度:站点

    • 浪费了大量时间打电话

    • 建立站点扩大了街道空间


识别Hotspots

  • Sampling Data Collector – The Statistical Solution

    • 描述执行的一个侧面(柱状图)

    • 低开销

  • Call Graph Data Collector– The Instrumentation Solution

    • 函数的时间信息

    • 函数调用者和被调用者的关系

    • 比sampling的开销高


三种性能监控方式的比较


VTune™Projects

  • 什么是 Project?

    • Project由一个或多个Activities组成

  • 什么是Activity ?

    • 包含你应用程序的信息和希望运行的数据收集器信息


Projects are organized like this:


AGENDA

  • Introduction / What’s New in 6.0

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linux


Sampling Technology

  • 打断处理器的执行,获得执行上下文

    • 中断可以是周期性的, 如每秒1,000次采样

    • 采样的触发 Event Based Sampling (EBS).

      • 采样事件:处理器相关事件,如 L2 Cache Misses, Branch Mispredictions, Floating-point instructions retired, etc.


Lab 1: gzip Sampling Analysis

  • Introduces EBS and Sampling UI

  • gzip is an open source file compression program


Select New Project


Select Sampling Wizard and then OK


Select Win32*/Win64*/Linux* Profiling radio button and then OK


Remember each Activity has its own Application/Module Profile

  • Browse to the application: gzip.exe

  • The command line arguments are: -f testfile.dat

  • Check Modify default configuration

  • Click on Finish


Modify the Sampling Activity

  • Select the Sampling check box.

  • Click on Configure


Uncheck Calibrate Sample After Value checkbox

Why do this?


Click OK to run the activity


根据采样次数找到hotspot


AGENDA

  • Introduction / What’s New in 6.0

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linux


根据总时间找到关键路径


AGENDA

  • Introduction / What’s New in 6.0

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linu


根据占处理器时间找hotspot


修改代码进行优化


AGENDA

  • Introduction / What’s New in 6.0

  • Terminology

  • Sampling

  • Call Graph

  • Counter Monitor

  • VTune on Linux


VTune on Linux

  • 在Linux上安装Sampling Driver

  • 在Linux上启动VTune server

  • 在Windows上进行远程收集


链接

  • http://www.intel.com/software/products/college/vtune/getstart/tutorial/index.htm


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