Koichi Hirai, Fujitsu Post-K use Arm based super computer. But there are not too many Arm based servers for HPC. Therefore we think to need to build Arm HPC Ecosystem until Post-K release. In this presentation, we describe our collaboration efforts to build the Arm HPC Ecosystem.

1. Copyright 2017 FUJITSU LIMITED
Arm HPC Workshop
Application Development Tools
for Post-K Supercomputer
13th December 2017
Tomotake NAKAMURA
Performance Analysis Dept. Compiler Development Div.
Next Generation Technical Computing Unit
FUJITSU LIMITED
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2. Copyright 2017 FUJITSU LIMITED
 Profiler, debugger and IDE for K computer
 Direction of tools’ enhancements for Post-K
 Cases of collaboration with OSS
 mpiP
 Eclipse PTP
 Exporting profilers’ data in XML format
 Summary
Outline
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3. Copyright 2017 FUJITSU LIMITED
 Mainly provided by FUJITSU
 With support for K’s original hardware
 Profiler: rich performance counters in CPU &
Tofu interconnect
 Debugger: extension of SIMD instructions,
increased # of registers
 Good reputation, especially for the profiler
 Applicable to optimized executables
 Detailed performance report for precise analysis
•Leads to loop transformations, data prefetching, ...
 But, Post-K adopt Armv8-A with SVE
 Not “only one” architecture
 Software ecosystem will help application
development more
Profiler, Debugger and IDE for K computer
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4. Copyright 2017 FUJITSU LIMITED
 Many OSS middleware on K computer
 Linux OS, Lustre file system (customized), Open MPI (customized), GCC, ...
 As profilers: mpiP (customized), VampirTrace (integrated), Score-P, TAU, ...
 Advantages of OSS-based development tools
 Lowering barrier for new users by compatibility and existing know-how
 Various attempts in user interfaces for usability
 For Post-K, while enhancing own profilers’ capability,
Fujitsu will integrate OSS technologies for the above advantages
Direction of Tools’ Enhancements for Post-K
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IDE for K computer
Eclipse PTP

5. Copyright 2017 FUJITSU LIMITED
 mpiP: lightweight profiling library for MPI applications
 Generates simple report in text format, in contrast to much info. by Fujitsu’s one
 Customized and provided by Fujitsu since PRIMEHPC FX100
 Enhancement: additional MPI_Barrier before/after collective communications
•To distinguish wasted time caused by load imbalance among processes
 More than one choice is reasonable for profilers
 Degree of richness of generated reports
 Various attempts in user interfaces for performance analysis
Cases of Collaboration with OSS: mpiP
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Communication Statistics by Fujitsu’s Profiler Example of mpiP Report

6. Copyright 2017 FUJITSU LIMITED
 Eclipse PTP: IDE for development of parallel applications
 Editing source code, job submission & monitoring, …
 Adopted to simplify workflow of development & perf. analysis
 Key feature: “synchronized project” functionality
 Switching from WWW-based framework, offline work becomes easy
 Integration of profilers is under development
Cases of Collaboration with OSS: Eclipse PTP
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(Source: Eclipse PTP Tutorial)

7. Copyright 2017 FUJITSU LIMITED
 Fujitsu’s profilers gather much data and generate detailed reports
 But, there could be too many analysis views to be covered by the
product
 On Post-K, profilers’ data can be exported in XML as well as text
and CSV formats
 Tool developers and perf. engineers are welcome to collaborate on UIs
Exporting Profilers’ Data in XML Format
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Performance Report by Fujitsu’s Profiler
Breakdown of execution time
OPRT_divergence:1634 OPRT_gradient:1741 OPRT_divdamp:2779
OPRT3D_divdamp:218 advlim_thuburn_v:801 Others
Example of User-defined Report
Colored according to bottlenecks
red: cache&memory blue: calculation
green: well-executed

8. Copyright 2017 FUJITSU LIMITED
 For Post-K, Fujitsu will provide enhanced application development
tools with integration of OSS technologies
 Lowering barrier for new users, various attempts in UIs
 Also we expect the success of OpenHPC activity in terms of
development tools, which will satisfy basic needs of many users
 Score-P, TAU and other tools are ready to use by RPM-provided packages
Summary
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9. 8 Copyright 2017 FUJITSU LIMITED