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Fall 2014 SPO600 Weekly Schedule

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|6||Oct 6||[[#Tuesday (Oct 7)|Guest Speaker: Jon "Maddog" Hall]]||[[#Friday (Oct 10)|Codebase analysis / Memory barriers and Atomics]]||[[#Week 6 Deliverables|Analyze your portion of the potential projects list and post your results on the wiki and your blog; select two projects and contact the associated communitiesplatform-specific code in 3 packages.]]
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|7||Oct 13||[#Tuesday (Oct 15)|[[#Tuesday (Oct 14)|Architecture-specific Code for Performance- Why?]]||Group hack session - Porting[[#Friday (Oct 17)|Compiler Intrinsics and Picking your Package]]||[[#Week 7 Deliverables|Blog Pick your package and blog about your progressit.]]
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|Study Week||Oct 20||colspan="3" align="center"|Study Week<br />'''[http://fsoss.ca FSOSS 2014] on Thursday-Friday'''
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|8||Oct 27||Architecture-specific [[#Tuesday (Oct 28)|Working with the Code for Performance]]||[[#Friday (Oct 31)|Group hack session - PortingProfiling]]||[[#Week 8 Deliverables|Blog about your progress.]]
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|9||Nov 3||Portability - Removing platform-specific code[[#Tuesday (Nov 4)|Profiling review]]||[[#Friday (Nov 11)|Group hack session - Portability]]||[[#Week 9 Deliverables|Blog about Post baseline stats for your progresssoftware.]]
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|810||Nov 10||Project Work[[#Tuesday (Nov 11)|Presentations]]||Project Work[[#Friday (Nov 14)|AArch64 on x86_64 / Hack session]]||[[#Week 10 Deliverables|Get code into review and blog Blog about ityour project status - 1st project marks.]]
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|911||Nov 17||Status Update[[#Tuesday (Nov 18)|Discussion and hack session]]|Foundation Models|[[#Friday (Nov 21)|Install Discussion and Test With Foundation Model hack session: Commercial vs. Technical Reality]]||[[#Week 11 Deliverables|Upstream your work and blog about it.]]
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|1012||Nov 1024||Profiling[[#Tuesday (Nov 25)|Project Update Presentations]]||[[#Friday (Nov 28)|Discussion and hack session]]|Baseline Profiling|[[#Week 12 Deliverables|Post baseline stats for Blog about your softwareproject status - 2nd project marks.]]
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|1113||Nov 17Dec 1||Optimizing Code[[#Tuesday (Dec 2)||Group hack - Profiling Discussion and optimizing||Post a code review update.|- |12||Nov 24||Using complier optimizations||Project Work||Post a code review update.|- |13Hack Session]]||[[#Friday (Dec 15)||Final Presentations||Final PresentationsDiscussion and Hack Session]]||Code accepted upstream. Blog about it!
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!Category!!Percentage!!Evaluation Dates
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|Communication||align="right"|20%||<strike>September 30</strike>, <strike>October 31</strike>, November 21, December 10
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|Quizzes||align="right"|10%||May be held during any class, usually at the start of class. A minimum of 5 one-page quizzes will be given. No make-up/retake option is offered if you miss a quiz. Lowest 3 scores will not be counted.
|Labs||align="right"|10%||See deliverables column above.
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|Project work||align="right"|60%||October 10<strike>November 11</strike> (15%), November 2125 (20%), December 10(25%)
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=== Week 5 Deliverables ===
* Blog about the [[SPO600 Assembler Lab|assembler lab (Lab 3)]].* Blog about Do the potential project list tasks assigned to youon the [[Fall 2014 SPO600 Packages by Participant]] page, and blog about it.
== Week 6 ==
Jon "Maddog" Hall will be joining us for a remote talk and Q&A via Google Hangout.
<!--=== Friday (Oct 10) ===
############################################################################################################################################################################################################################################################################################################In groups, we'll be analyzing software pacakges from the [[Fall 2014 SPO600 Packages by Participant|Packages by Participant]] list to find the platform-specific code and build instructions.
== Carried Forward from previous semester -- Kept here for potential copypasta = Week 6 Deliverables ===
=== Friday * Pick three additional packages (Jan 17not the ones done in class) ===* from your section of the [[Fall 2014 SPO600 Compiled C LabPackages by Participant|Packages by Participant]] == Deliverables ==* list and find the platform-specific code (or build instructions). Figure out what that code does, and document that on the list page. Blog about your results and your conclusion to reflections on the [[SPO600 Compiled C Lab]]task.
== Week 7 ==
== Week 3 = Tuesday (Oct 14) ===
=== Tuesday (Jan 21) ===* [[Assembler Basics]] === Friday (Jan 24) ===* Background information: [[SPO600 aarch64 QEMU on Ireland]]* [[SPO600 Assembler Lab]] === Week 3 Deliverables ===* Blog your conclusion to Discussion of some of the [[SPO600 Assembler Lab]] == Week 4 == === Tuesday reasons that platform specific (Jan 28usually assembly language) ===* [[SPO600 Assembler Lab|Assembler Lab]] review* [[Inline Assembly Language]]* [[Compiler Optimizations]] === Friday (Jan 31) === * [[Codebase Analysis Lab]] === Week 4 Deliverables === * '''Reminder:''' Week 1-3 blog posts are due for marking on Friday, January 31.* Blog about the [[Codebase Analysis Lab]] == Week 5 == === Tuesday (Feb 4) === Platform-specific code is often utilized for '''Memory Barriers''' and '''Atomics Operations'''.used in software
==== Memory Barriers ====
** [http://blogs.msdn.com/b/oldnewthing/archive/2008/10/03/8969397.aspx MSDN Blog Post] with a very clear explanation of Acquire-Release.
** [http://preshing.com/20130922/acquire-and-release-fences/ Preshing on Programming post] with a good explanation.
** [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.genc010197a/index.html ARMv8 Instruction Set Architecture Manual] (ARM InfoCentre registration required) - See the section on Acquire/Release and Load/Store, especially Load/Store Exclusive (e.g., LDREX)
==== Atomics ====
'''Atomics''' are operations which must be completed in a single step (or appear to be completed in a single step) without potential interruption.
* Wikipedia has a good basic overview of the need for atomicity in the article on [http://en.wikipedia.org/wiki/Linearizability Linerarizability]
* GCC provides intrinsics (built-in functions) for atomic operations, as documented in the GCC manual:
** [http://gcc.gnu.org/onlinedocs/gcc-4.8.2/gcc/_005f_005fsync-Builtins.html#_005f_005fsync-Builtins Legacy __sync Built-in Functions for Atomic Memory Access]
** [http://gcc.gnu.org/onlinedocs/gcc-4.8.2/gcc/_005f_005fatomic-Builtins.html#_005f_005fatomic-Builtins Built-in functions for memory model aware atomic operations]
* The Fedora project has some guidelines/recommendations for the use of these GCC builtins:
** http://fedoraproject.org/wiki/Architectures/ARM/GCCBuiltInAtomicOperations
 
=== Friday (Feb 7) ===
 
==== Hack Session: Potential Project Analysis ====
 
Select a project from the [[Winter 2014 SPO600 Software List]] and perform these steps:
# Edit that page to put your name in the "Claimed by" column.
# Investigate the package to determine:
#* If the current version has been built for ARM (e.g., exists in the Fedora aarch64 port - fastest way to test is to use 'yum' inside the arm64 emulation environment on Ireland)
#* What the platform-specific code in the software does
#* Whether portable work-arounds exist
#* The need for an aarch64 port or for platform-specific code elimination
#* Opportunities for optimization
#* The amount of work involved in porting and optimizing, and your skills for performing that work
# Based on the result of your investigation, decide on your interest in the project.
#* If you wish to choose this project for yourself, place it on your row in the [[Winter 2014 SPO600 Participants|Participants]] page.
#* If you do not wish to choose this project, remove your name from the "Claimed by" column in the [[Winter 2014 SPO600 Software List|Software List]] page.
# Repeat until you have two packages.
 
{{Admon/note|Overload|It is strongly recommended that you choose two projects with a total scope sum of 0-1. If you wist to try a higher or lower sum, or more or less than two projects, please talk to your professor.}}
 
{{Admon/tip|RPM Packages|For sofware that is present in the rpmfusion repositories but not in Fedora, you can use <code>yumdownloader --source ''packagename''</code> to grab the source RPM and then examine it using the RPM tools. See [[RPM Packaging Process]] for information.}}
 
=== Week 5 Deliverables ===
* Blog about your two selected projects, including your detailed initial analysis of them.
** You may want to break this into a couple of posts - e.g., post about your first package while you're working on your second.
** Feel free to also blog about why you did '''not''' choose particular packages, too.
== Week 6 = Friday (Oct 17) ===
=== Tuesday * [[Compiler Intrinsics]]** The use of compiler intrinsics (Feb e.g., those in gcc, or in another compiler) locks you into the use of that specific compiler (or another that supports the exact same intrinsics), but it provides platform portability. It is better to use language features (e.g., C11 or C++11atomic and acquire/release syntax) where possible, but since that is often not possible, the use of compiler intrinsics is more maintainable than inline assembly.** GCC provides intrinsics (built-in functions) for atomic operations, as documented in the GCC manual:*** [http://gcc.gnu.org/onlinedocs/gcc-4.9.1/gcc/_005f_005fsync-Builtins.html#_005f_005fsync-Builtins Legacy __sync Built-in Functions for Atomic Memory Access]*** [http://gcc.gnu.org/onlinedocs/gcc-4.9.1/gcc/_005f_005fatomic-Builtins.html#_005f_005fatomic-Builtins Built-in functions for memory model aware atomic operations]** The Fedora project has some guidelines/recommendations for the use of these GCC builtins:*** http://fedoraproject.org/wiki/Architectures/ARM/GCCBuiltInAtomicOperations* Select your project(s):** Criteria:**# Interest**# Scope**# Fit between your skills and project needs**# Upstream status (e.g., dead project) ===
* Architecture-specific code for Performance** Sometimes assembler is used in a C/C++ program for performance. However, modern versions of C/C++ (such as C++11) and recent compilers provide portable ways of accessing high-performance processor capabilities, such as Single Instruction/Multiple Data (SIMD) instructions (called "marketing names" such as SSE, Neon, MMX, 3DNow, or AltaVec on various processors).** Linaro enginener Matthew Gretton-Dann gave a good presentation on [http://www.linaro.org/linaro-blog/2013/09/20/introduction-to-porting-and-optimising-code/ Porting and Optimizing Code] for aarch64. The vectorization portion, beginning at 28:10, provides a good introduction to SIMD and autovectorization using GCC on aarch64 (Note that the earlier portion of the presentation includes good information about Atomics).*** [http://www.youtube.com/watch?v=epzYErIIx0Y YouTube Video] direct link*** [http://www.linaro.org/assets/common/campus-party-presentation-Sept_2013.pdf Slides] direct link** Note that in the presentation above, Matthew takes the code beyond portability without straying into assembler (e.g., using compiler-specific, architecture-specific intrinsics). It is possible to achieve almost all of the performance gains without becoming arch-specific, and most of those can be attained without becoming compiler-specific as well.* For full details on the SIMD instructions in aarch64, refer to the [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.genc010197a/index.html ARMv8 Instruction Set Overview], particularly section 5.= Week 7.Deliverables ===
=== Week 6 Deliverables ===* Complete your analysis of your # Select at least two selected software projects (if you haven't already) - see packages from the [http://performance.linaro.org Linaro performance web site] and/or the [[#Week 5Fall 2014 SPO600 Packages by Participant|Week 5Packages]]page. Blog in detail about # Record your findings.choice on:* Identify the upstream communities ## The [[Fall 2014 SPO600 Participants|Participants page]] - so that your colleagues in class know that develop and maintain the software you have selected to work 're working onthe package(s). Figure out how they are structured'''Note:''' Package choices will be approved by [[User:Chris Tyler|your professor]], how they communicatebut will usually be accepted on a first-come, how code is maintained, and how patches are acceptedfirst-served basis.## The [http://performance.linaro. Introduce yourself to each org Linaro performance web site] - this will tell other people outside of our group within the Linux-on-ARM community that you are working on the two communities package(one for each of the two software projects you have selecteds). Blog # Investigate and blog about your findingschoice.
== Week 7 =='''Over reading week:'''* Project Work# Contact the upstream communities for the packages you have selected -- so that they know that you are working on the package and to open a channel of communication for your forthcoming patches (or benchmarks, or other results).# Formulate a work plan that will conclude with landing your software changes in the upstream software before the end of the course.# Blog about your work plan and what you need to investigate/learn in order to complete your project.
== Week 8 ==
* Project Work ([[User:Chris Tyler|Chris Tyler]] is at [http://www.linaro.org/connect-lca14 Linaro Connect]) this week.
* Aim at getting your code changes upstream to your communities
== Week 9 ===== Tuesday (March 11Oct 28) ===* Status updates* Update from Linaro Connect* Discussion of useful tools** screen** time
=== Friday (March 14) ===* Comparison of Emulation** QEMU** Fast Model and Foundation Model* Install and configure Working with the Foundation ModelCode** [[:fedora:Architectures/ARM/AArch64/QuickStart|Fedora AArch64 Quick Start]]** [http://www.linaro.org/engineering/engineering-projects/armv8 Linaro Foundation Model Instructions]Working with GIT* Baseline BenchmarkingWorking with other version control systems
==== Resources ====* Foundation Model** [http://www.arm.com/products/tools/models/fast-models/ ARM Fast Models] - Note that "fast" here refers to Looking at How Distributions Package the modelling approach, not execution speed!* BenchmarkingCode** [http://www.tokutek.com/wp-content/uploads/2013/05/20130424-percona-live-benchmarking.pdf Benchmarking Talk by Tim Callaghan]Using fedpkg
=== Week 9 Deliverables Friday (Oct 31) ===* Set up the Foundation Model* Upstream your proposed code changes* Blog about your work == Week 10 ==Benchmarking and Profiling
=== Tuesday (March 18) ===
* Profiling with <code>gprof</code>
** Build with profiling enabled (use the option <code>-pg</code>with both gcc and ld)
** Run the profile-enabled executable
** Analyze the data in the <code>gmon.out</code> file
* [http://www.thegeekstuff.com/2012/08/gprof-tutorial/ Profiling with GProf]
=== Week 8 Deliverables ===* Blog about your progress connecting with the communities associated with your projects and working with the code. == Week 9 ===== Tuesday (Nov 4) ==* Profiling/baseline benchmarking review* Hacking session === Friday (March 21Nov 7) ===* Gather Hacking session === Week 9 Deliverables ===* Blog about your baseline statistics for benchmarking/profiling. == Week 10 ===== Tuesday (Nov 11) ===* Presentation on your softwareproject status === Friday (Nov 14) ===* Running AArch64 code on x86** Foundation models** [[AArch64 QEMU User Space Emulation]]
=== Week 10 Deliverables ===
* Blog about your baseline benchmark project status  == Week 11 ===== Tuesday (Nov 18) ===* Discussion and hack session** Blog post about upstreaming: [https://www.linaro.org/blog/core-dump/working-upstream/ What do we mean by working upstream: A long-term contributor's view] === Friday (Nov 21) ===* Discussion and hack session === Week 11 Deliverables ===* Upstream your changes/test results/documentation* Blog about your work* '''Note: Blogs will be marked as of Nov 21 11:59 pm''' == Week 12 ===== Tuesday (Nov 25) ===* Project update presentations === Friday (Nov 28) ===* Discussion and hack session: ''Commercial vs. Technical Reality'' == Week 13 == === Tuesday (Dec 2) ===* Discussion and hack session === Friday (Dec 5) ===* Wrap-->up session* '''Remember: Final project submissions via blog are due 11:59 pm December 10.''' 
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