Parallel processing(361-1-3621)

lecturer: Dr. Guy Tel-Zur

Submitted by :Adi Hbursi 066140518Israel Karity 021537543

UPC

UNIFIED PARALLEL C Extention of ANSI/ISO C 99Requires a designated compiler. Most

common berkely UPC and gcc/upc. But also IBM, HP, Cray, etc.

Descendant of split-c and parallel-c preprocessor

PGAS – Partitioned Global Adress SpaceSPMD – Single Program Multiple Data

זה ?UPCמה

Different programming models

Memory division

PointersPrivate-pointer: can reference addresses in private

space or related portion of shared memoryPointer-to-shared: can reference all of shared memory

Mode of operationconcurrent threads with a partitioned shared space

-A partition can reference data in another partition

-Global arrays have fragments in multiple Partitions

-MYTHREAD specifies the thread index (0..THREADS-1)

PGAS MODELPartitioned Global Memory Shared

Advantages : -Helps in exploiting locality

-(Simple statements (as in shared memory

Disadvantages: -Problem with synchronization (solved with

locks) -Sharing all memory can result in bugs

Advantages and disadvantages

Example of code

Study conducted by Tarek El-Ghazawi from The :George Washington University

1 .:// . .http upc gwu edu2 .://http

. . / / _ _en wikipedia org wiki Unified Parallel C3.“ Unified Parallel C Tutorial at

PGAS09”  Tarek El-Ghazawi, The George Washington University

Bibliography: