Using the Intel VTune Amplifier 2013 on Embedded Platforms

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1 Using the Intel VTune Amplifier 2013 on Embedded Platforms Introduction This guide explains the usage of the Intel VTune Amplifier for performance and power analysis on embedded devices. Overview VTune Amplifier consists of three parts that are installed all together when product is installed on a Linux* host system: VTune Amplifier, including: o GUI for power and performance analysis o command line for text-based power and performance analysis VTune Amplifier collector for 32-bit embedded Linux systems VTune Amplifier collector for 64-bit embedded Linux systems Installing the VTune Amplifier on a Host Development System If the VTune Amplifier Update2 or higher is installed, you can use its GUI and command line (amplxecl) interface for viewing and analyzing power and performance data collected on the target embedded system. In this case it is not necessary to install the VTune Amplifier component on the host system. Otherwise, install the VTune Amplifier component on the host system by running: Windows installer (VTune_Amplifier_2013_setup.exe) Linux installer (./install.sh) By default, the product is installed to the /opt/intel/vtune_amplifier_xe_2013 directory on your host (further referred to as <install_dir>). Installing the VTune Amplifier Collector on Target Embedded Systems Once product is installed on the Linux host system, you can start provisioning of the target devices. To do this, you need SSH access to the target system. Building Sampling and Power Drivers To see how to build product drivers, refer to the Installing the Sampling Driver and Installing Power Analysis Driver product documentation topics. When building a driver for the target system, make sure: Page 1

2 Kernel headers correspond to the kernel version running on the device. Compiler version corresponds to the architecture (x86 or x86_64) of the kernel running on the target system. Installing Sampling and Power Drivers on the Target Device Once drivers are built, copy <install_dir>/sepdk and <install_dir>/powerdk folders to the target device to the /opt/intel/vtune_amplifier_xe_2013 directory. You may choose another directory if this location is not accessible/does not exist or you can mount those folders via NFS. On the target device, install the drivers as described in the Installing the Sampling Driver and Installing Power Analysis Driver online help topics. If scripts do not work on the target system due to absence of standard Linux commands, you may install drivers manually using the insmod command. Installing the VTune Amplifier Collector on the Target Device Copy content of <install_dir>/target/linux32 or <install_dir>/target/linux64 folder to /opt/intel/vtune_amplifier_xe_2013 on the target device using SSH depending on the architecture of the running operating system. The default layout on a 32-bit target system expected by the product should be as follows: /opt/intel/vtune_amplifier_xe_2013 For a 64-bit target system: /bin32 /lib32 /message /opt/intel/vtune_amplifier_xe_2013 /bin64 /lib64 /message Performance Collection and Analysis Prerequisites: Install Python on the Windows* host system. The package is available from Python is usually installed on Linux systems by default. To collect data on a remote system, use the <install_dir>/target/amplxe-runss.py script. This script uses SSH to collect data on the target system and move results back to the host. Page 2

3 Setting up SSH for Remote Collection Configure SSH to work in password-less mode so it does not prompt for the password on each invocation. To do this, use the key generation utility on the host system: host> ssh-keygen host> cat ~/.ssh/id_rsa.pub SSH 'cat >> ~/.ssh/authorized_keys' Collecting Data When collecting data remotely, amplxe-runss.py looks for the collector on the target device in its default location: /opt/intel/vtune_amplifier_xe_2013. It also temporary stores performance results on the target system in the /tmp directory. If you installed the collector to a different location and need to specify another temporary directory, you can use the following environment variable on the host: host> export AMPLXE_TARGET_PRODUCT_DIR=<another path to target collector> host> export AMPLXE_TARGET_TMP_DIR=<another temporary directory> Note that amplxe-runss.py is a simple wrapper over the amplxe-runss target collector binary that operates over SSH to start the collection, control it and move the results (including modules) back to the host system. You can always use amplxe-runss binary directly on the target system and either copy results manually, or mount them over NFS file system. To run event-based system-wide sampling collection: The command line below collects system-wide sampling information without call stacks. This command automatically pulls in modules required for viewing results from the device and caches them in the temp directory on the host. This happens only on the first collection, all subsequent collections reuse modules from the cache. host>./amplxe-runss.py --target=user@target -r result@@@ --duration 10 --no-pmu-stack --event-config CPU_CLK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF: For system-wide collection, a lot of modules running in the system during collection are copied from the target to the host, which may take a while. However, this happens only once since./amplxerunss.py caches target system modules on the host for faster access on the next collection. If you do not want the command to take the modules from the device, you can specify a local directory where modules will be searched first, for example: Page 3

4 host>./amplxe-runss.py -r -- duration 10 --no-pmu-stack --search-dir <local directory with modules> --event-config CPU_CLK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF: In the case above, <local directory with modules> can be either a directory where modules are located, or it can be pointer to the root file system of the target device. For example, when the collector searches for the /usr/lib64/libstdc++.so file from the target device, it first tries <local directory with modules>/usr/lib64/libstdc++.so , then it tries <local directory with modules>/libstdc++.so , and only after that it attempts to copy the file from the target device. To run event-based sampling collection for an application: In this command line, you attach to a running application by its PID: host>./amplxe-runss.py --target=user@target -r result@@@ --target-pid no-pmu-stack --event-config CPU_CLK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF: To run event-based stack sampling collection for the application: Remove the --no-pmu-stack option from the command line and run the collection: host>./amplxe-runss.py --target=user@target -r result@@@ --eventconfig CPU_CLK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF: -- <path to the application on the target> To run power system-wide collection: host>./amplxe-runss.py --target=user@target -r power_r@@@ --duration 10 --pwr-config sleep,frequency To collect user annotations (ITT API data): Pass the --itt-config all option in addition to other options. Note that ITT API can be collected only when your application is launched by the collector. host>./amplxe-runss.py --target=user@target -r result@@@ --itt-config all --event-config CPU_CLK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF: -- <path to the application on the target> To control collection from the command line: You can pause, resume and detach collection from the host as follows: host>./amplxe-runss.py --target=user@target -r result@@@ -C pause host>./amplxe-runss.py --target=user@target -r result@@@ -C resume Page 4

5 host>./amplxe-runss.py -r -C detach Viewing Collected Data in the VTune Amplifier GUI Use the VTune Amplifier graphical interface (amplxe-gui) to view the collected data. It sorts and filters the data and presents it to maximize intelligent inferences on performance problems. To view the collected data, pass the result directory produced at a collection stage to the amplxe-gui command on the host system. Page 5

6 Advanced Collection for the Intel Atom Processors You can configure the VTune Amplifier collector to take other counters, such as Cache Misses, Branch Mispredicts, and others. To specify the counters, type: host>./amplxe-runss.py -r --duration 10 --event-config '<event name1>':modifier1=val You can take any counter supported by the Performance Monitoring Unit (PMU). Additionally, you can enable multiple counters at a time, although the Intel Atom processors only support a few counters at a time. For a complete list of available options for the collector, see amplxe-runss.py --help command. To identify potential latency or responsiveness issues, use the following collection configuration: host>./amplxe-runss.py --target=user@target -r result@@@ --duration 10 --no-pmu-stack --event-config CPU_CLK_UNHALTED.REF:sa=20000 This command line takes samples at ~2x the rate of a context switch, which gives you an approximately 20% performance hit. Page 6

7 Examples of Collector Configurations a. Configure collector data for unhalted reference clocks to determine when and how often CPU utilization is an issue: host>./amplxe-runss.py -r -- duration 10 --no-pmu-stack --event-config CPU_CLK_UNHALTED.REF:sa=20000 b. Configure collector data for clock ticks and instructions retired: host>./amplxe-runss.py -r -- duration 10 --no-pmu-stack --event-config CPU_CLK_UNHALTED.CORE:sa=100000,INST_RETIRED.ANY:sa= c. Configure collector data for LBR data (Last Branch Records tell you exactly what was run on the system): host>./amplxe-runss.py -r -- duration 10 --no-pmu-stack --event-config "BR_INST_RETIRED.TAKEN" -go 1 d. Configure the collection to identify architectural issues with the General Exploration viewpoint in the VTune Amplifier GUI. Issue the following collector command line to collect the required counters for the General Exploration viewpoint : Note: This collection uses Event Multiplexing with a large list of counters. To make it accurate, the collection duration should be significant (20s or more). host>./amplxe-runss.py --target=user@target -r result@@@ -- duration 30--no-pmu-stack --event-config "BR_INST_RETIRED.MISPRED.PS:,BUS_LOCK_CLOCKS.ALL_AGENTS:,CPU_C LK_UNHALTED.CORE:,CPU_CLK_UNHALTED.REF:,CYCLES_DIV_BUSY:,DATA_ TLB_MISSES.DTLB_MISS:,EXT_SNOOP.ALL_AGENTS.HITM:,FP_ASSIST.S:, ICACHE.MISSES:,INST_RETIRED.ANY:,ITLB.MISSES:,MACHINE_CLEARS.S MC:,MEM_LOAD_RETIRED.L2_HIT.PS:,MEM_LOAD_RETIRED.L2_MISS.PS:,M ISALIGN_MEM_REF.LD_SPLIT.AR:,MISALIGN_MEM_REF.ST_SPLIT.AR:,PAG E_WALKS.CYCLES:,REISSUE.OVERLAP_STORE.AR:,SIMD_ASSIST:,UOPS.MS _CYCLES:,UOPS_RETIRED.ANY:" After collecting these events, open the collected result in the VTune Amplifier GUI and change the viewpoint to General Exploration. Page 7

8 Additional Resources To get a list of counters, see: For the Intel Atom microarchitecture specifics, see Chapter 13: Intel Atom Microarchitecture and Software Optimization at: architectures-optimization-manual.html To get a list of useful counters selected by Intel architects for particular Intel microarchitectures, you may either use the predefined viewpoint configurations, like the General Exploration viewpoint mentioned above, or explore the list incorporated into the Intel Performance Bottleneck Analyzer: Page 8

9 Legal Information INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. A "Mission Critical Application" is any application in which failure of the Intel Product could result, directly or indirectly, in personal injury or death. SHOULD YOU PURCHASE OR USE INTEL'S PRODUCTS FOR ANY SUCH MISSION CRITICAL APPLICATION, YOU SHALL INDEMNIFY AND HOLD INTEL AND ITS SUBSIDIARIES, SUBCONTRACTORS AND AFFILIATES, AND THE DIRECTORS, OFFICERS, AND EMPLOYEES OF EACH, HARMLESS AGAINST ALL CLAIMS COSTS, DAMAGES, AND EXPENSES AND REASONABLE ATTORNEYS' FEES ARISING OUT OF, DIRECTLY OR INDIRECTLY, ANY CLAIM OF PRODUCT LIABILITY, PERSONAL INJURY, OR DEATH ARISING IN ANY WAY OUT OF SUCH MISSION CRITICAL APPLICATION, WHETHER OR NOT INTEL OR ITS SUBCONTRACTOR WAS NEGLIGENT IN THE DESIGN, MANUFACTURE, OR WARNING OF THE INTEL PRODUCT OR ANY OF ITS PARTS. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined". Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice. Do not finalize a design with this information. The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling , or go to: Intel processor numbers are not a measure of performance. Processor numbers differentiate features within each processor family, not across different processor families. Go to: This document contains information on products in the design phase of development. Software and workloads used in performance tests may have been optimized for performance only on Intel microprocessors. Performance tests, such as SYSmark and MobileMark, are measured using specific computer systems, components, software, operations and functions. Any change to any of those factors may cause the results to vary. You should consult other information and performance tests to assist you in fully evaluating your contemplated purchases, including the performance of that product when combined with other products. For more information go to BlueMoon, BunnyPeople, Celeron, Celeron Inside, Centrino, Centrino Inside, Cilk, Core Inside, E-GOLD, Flexpipe, i960, Intel, the Intel logo, Intel AppUp, Intel Atom, Intel Atom Inside, Intel CoFluent, Intel Page 9

10 Core, Intel Inside, Intel Insider, the Intel Inside logo, Intel NetBurst, Intel NetMerge, Intel NetStructure, Intel SingleDriver, Intel SpeedStep, Intel Sponsors of Tomorrow., the Intel Sponsors of Tomorrow. logo, Intel StrataFlash, Intel vpro, Intel Xeon Phi, Intel XScale, InTru, the InTru logo, the InTru Inside logo, InTru soundmark, Itanium, Itanium Inside, MCS, MMX, Pentium, Pentium Inside, Puma, skoool, the skoool logo, SMARTi, Sound Mark, Stay With It, The Creators Project, The Journey Inside, Thunderbolt, Ultrabook, vpro Inside, VTune, Xeon, Xeon Inside, X-GOLD, XMM, X-PMU and XPOSYS are trademarks of Intel Corporation in the U.S. and/or other countries. * Other names and brands may be claimed as the property of others. Microsoft, Windows, and the Windows logo are trademarks, or registered trademarks of Microsoft Corporation in the United States and/or other countries. Java is a registered trademark of Oracle and/or its affiliates. Copyright (C) , Intel Corporation. All rights reserved. Page 10

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