scholarly journals Portable Memory Consistency for Software Managed Distributed Memory in Many-Core SoC

2013 ◽  
Author(s):  
Jochem H. Rutgers ◽  
Marco J.G. Bekooij ◽  
Gerard J.M. Smit
Keyword(s):  
Distributed Memory ◽  
Memory Consistency ◽  
Many Core

scholarly journals Using Coarrays to Parallelize Legacy Fortran Applications: Strategy and Case Study

2015 ◽  
Vol 2015 ◽  
pp. 1-12
Author(s):  
Hari Radhakrishnan ◽  
Damian W. I. Rouson ◽  
Karla Morris ◽  
Sameer Shende ◽  
Stavros C. Kassinos
Keyword(s):  
Distributed Memory ◽  
Profile Analysis ◽  
Multicore Processors ◽  
Rapid Evolution ◽  
Model Verification ◽  
Parallel Application ◽  
Linear Speedup ◽  
And Performance ◽  
Many Core

This paper summarizes a strategy for parallelizing a legacy Fortran 77 program using the object-oriented (OO) and coarray features that entered Fortran in the 2003 and 2008 standards, respectively. OO programming (OOP) facilitates the construction of an extensible suite of model-verification and performance tests that drive the development. Coarray parallel programming facilitates a rapid evolution from a serial application to a parallel application capable of running on multicore processors and many-core accelerators in shared and distributed memory. We delineate 17 code modernization steps used to refactor and parallelize the program and study the resulting performance. Our initial studies were done using the Intel Fortran compiler on a 32-core shared memory server. Scaling behavior was very poor, and profile analysis using TAU showed that the bottleneck in the performance was due to our implementation of a collective, sequential summation procedure. We were able to improve the scalability and achieve nearly linear speedup by replacing the sequential summation with a parallel, binary tree algorithm. We also tested the Cray compiler, which provides its own collective summation procedure. Intel provides no collective reductions. With Cray, the program shows linear speedup even in distributed-memory execution. We anticipate similar results with other compilers once they support the new collective procedures proposed for Fortran 2015.

Architecture and Evaluation of Low Power Many-Core SoC with Two 32-Core Clusters

2014 ◽  
Vol E97.C (4) ◽  
pp. 360-368
Author(s):  
Takashi MIYAMORI ◽  
Hui XU ◽  
Hiroyuki USUI ◽  
Soichiro HOSODA ◽  
Toru SANO ◽  
...  
Keyword(s):  
Low Power ◽  
Many Core

On Synchronization and Evaluation Method of Chipped Many-Core Processor

2010 ◽  
Vol 33 (10) ◽  
pp. 1777-1787 ◽  
Author(s):  
Wei-Zhi XU ◽  
Feng-Long SONG ◽  
Zhi-Yong LIU ◽  
Dong-Rui FAN ◽  
Lei YU ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Many Core

Using Write Mask to Support Hybrid Write-Back and Write-Through Cache Policy on Many-Core Architectures

2009 ◽  
Vol 31 (11) ◽  
pp. 1918-1928 ◽  
Author(s):  
Wei LIN ◽  
Xiao-Chun YE ◽  
Feng-Long SONG ◽  
Hao ZHANG
Keyword(s):  
Many Core
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