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项目作者： Adamouization

项目描述 ：
:repeat: Relaxation technique using POSIX threads (shared memory configuration) and MPI (distributed memory configuration).
高级语言： C
项目地址: git://github.com/Adamouization/Relaxation-Technique-Parallel-Computing.git
创建时间： 2018-11-04T15:41:27Z
项目社区：https://github.com/Adamouization/Relaxation-Technique-Parallel-Computing
开源协议：MIT License
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Relaxation Technique Parallelised in C using Pthreads and MPI

Problem Description

The objective of this assignment is to use low-level primitive parallelism constructs, first on a shared memory architecture then on a distributed memory architecture, and analyse how parallel problems scale on such an architectures using C, pthreads and MPI on Balena, a mid-sized cluster with 2720 cpu cores.

The background is a method called relaxation technique, a solution to differential equations, which is achieved by having a square array of values and repeatedly replacing a value with the average of its four neighbours, excepting boundaries values which remain fixed. This process is repeated until all values settle down to within a given precision.

Usage

Shared Memory Architecture (pthreads)

  • Compile using the makefile: make, or gcc main.c array_helpers.c print_helpers.c -o shared_relaxation -pthread -Wall -Wextra -Wconversion
  • Run: ./shared_relaxation <number_of_threads>

Distributed Memory Architecture (MPI)

  • Compile using the makefile: make or: mpicc -Wall -Wextra -Wconversion main.c -o distributed_relaxation -lm
  • Run: mpirun -np <num_processes> ./distributed_relaxation -d <dimension> -p <precision> -debug <debug mode>

where:

  • -np corresponds to the number of processes;
  • -d corresponds to the dimensions of the square array;
  • -p corresponds to the precision of the relaxation;
  • -debug corresponds to the debug mode (0: only essential information, 1: row allocation logs, 2: process IDs logs, 3: initial and nal arrays, 4: iteration debugging data).

Other

Running the shared memory architecture on the Balena cluster using SLURM

  • SSH into Balena: ssh [user_name]@balena.bath.ac.uk
  • cd into the project directory and submit the SLURM job script job.slurm to the queue: sbatch jobscript.slurm
  • Monitor the job in the queue: squeue -u [user_name]
  • View the results in the relaxation.<job_id>.out file using the cat *.out command.

Submitting multiple files using a bash script (shared memory testing)

  • ./submit_multiple_batch 1
  • cat *.out
  • Use following regex to retrieve time by using this regex \=.(\d+)\..(\d+) and pasting the output in regex101

Copying files to/from Balena

  • from BUCS to Balena: cp $BUCSHOME/dos/year\ 4/Relaxation-Technique-Parallel-Computing/src/<file> /home/o/aj645/scratch/cw2-distributed-architecture/

  • from Balena to BUCS: cp /home/o/aj645/scratch/cw2-distributed-architecture/<file> $BUCSHOME/dos/year\ 4/Relaxation-Technique-Parallel-Computing

Reports

  • You can read the shared architecture implementation using pthreads report here.
  • You can read the distributed architecture implementation using MPI report here.

TODO

See TODO.md

License

Contact

distributed_architecture_report_1647072804798.pdf
shared_architecture_report_1647072804905.pdf