Palestra ministrada por Leonardo Borges no Intel Software Conference nos dias 6 de Agosto (NCC/UNESP/SP) e 12 de Agosto (COPPE/UFRJ/RJ).

1. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Intel® Advisor XE 2013
Pleasure of parallelism without
much of the pain
Leo Borges (leonardo.borges@intel.com)
Intel - Software and Services Group
iStep-Brazil, August 2013
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2. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Agenda
• Motivation for the Advisor XE
• Advisor XE Workflow Steps
• Survey Program
• Annotate Sources
• Check Suitability
• Check Correctness
• Convert to Parallel Framework
• Demo
• Conclusion

3. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Simplify and Speed Threading Design
Intel® Advisor XE – Threading Assistant
The Challenge of Parallel Design:
– Need to implement to measure
performance
– Implementation is time
consuming
– Disrupts regular product
development
– Testing difficult without tools
• Intel Advisor XE
Separates Design &
Implementation
• Fast exploration of multiple options
• Find errors before implementation
• Design without disrupting development
– Linux* and Windows*
– C, C++, Fortran and C# code
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Add Parallelism with Less Effort, Less Risk and More Impact

4. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
How to use Intel® Advisor XE
• As a design tool that assists in making good
decisions to transform a serial algorithm to use
multi-core hardware
• As a parallel modeling tool that uses
annotations in the serial code to calculate what
might happen if that code were to execute in
parallel as specified by the annotations
• As a methodology and workflow to educate
users on an effective method of using parallel
programming
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5. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Intel® Advisor XE Workflow
Survey Program – Helps developers focus on the hot call trees and loops
as locations to experiment with parallelism.
Annotate Sources - Developers insert Parallel Advisor annotations into
their sources to describe parallel experiments.
Check Suitability – Helps developers evaluate the performance of their
parallel experiment by displaying the performance projection for each
parallel site and how each site’s performance impacts the entire program.
Check Correctness – Helps developers by identifying data issues (races)
in the parallel experiment.
Add Parallel Framework – Replace annotations.
Advisor XE analyzes the executing serial program as
developers progress through the methodology…
The Advisor XE Workflow window guides the developer throughout the process
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6. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Parallel Modeling of Serial Programs
• Your application can’t fail due to bugs caused by
incorrect parallel execution (it’s running serially)
• You can evaluate several different proposals before
committing to a specific implementation
• You can refactor your code to prepare it to be
easier to incorporate parallel frameworks later
• Many transformations that make your code easier
to parallelize, also make it easier to read and
maintain
• All of your test suites should still pass when
validating the correctness of your transformations
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7. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Intel® Advisor XE – Check Suitability
Developer’s tasks and locks that were
executed within the selected site
Program
impact
Scalability of
selected site
Developers evaluate their
parallel experiments based on
projected performance
improvements
Developer’s
parallel sites
How to
maximize the
performance
benefit of the
selected site
Help when the developer needs it
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8. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Intel® Advisor XE – Check Correctness
Developers evaluate the data
sharing problems that prevent
correct parallel execution
Observation
details
Observation
problem sets
Problems and
Messages
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9. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Advisor XE Annotation Concepts
• Advisor XE uses 3 primary concepts to create a model
– SITE
• A region of code in your application you want to
transform into parallel code
– TASK
• The region of code in a SITE you want to execute in
parallel with the rest of the code in the SITE
– LOCK
• Mark regions of code in a TASK which must be serialized
• You may create more than one SITE and they may be
nested
• Are macros in C/C++, function calls in C# & Fortran,
so work with any compiler
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10. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.

11. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Summary
• The Intel Advisor XE is a unique tool
– assists you to work smarter though detailed modeling
– guides you through the necessary steps
– leaves you in control of code and architectural choices
– lets you transform serial algorithms into parallel form
faster
• The parallel modeling methodology
– maintains your original application’s semantics and
behavior
– helps find the natural opportunities to exploit parallel
execution
• http://software.intel.com/en-us/intel-advisor-xe
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12. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
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14. © 2013, Intel Corporation. All rights reserved. Intel and the Intel logo 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.
Demo using Tachyon ray-tracing program
• (6 minute video of similar demo:
http://software.intel.com/en-us/intel-advisor-xe
under the “Learn” tab)
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