software

Introduction

I have changed the hostfile that determines the order of OpenMPI execution nodes and re-measured OpenMPI performance on the Himeno benchmark as this article I posted it. After posting, I thought about it again and decided to use objective figures instead of my own judgments based on CPU and clock performance.

So this time, I decided to measure the performance of each individual workstation (node), and then decide the order of hostfile according to the results, and measure them again.

Introduction

A month ago in this post, I measured the performance of OpenMPI with the HIMENO benchmark. My friend who saw that post pointed out some improvements regarding the order of the hostfile. In this post, I summarized the results of the performance measurement again after modifying the hostfile.

Introduction

In this article, I posted about my work on tutorial 4 of Athena++. Here, I post my work on the Rayleigh-Taylor instability challenge in 3D.

Introduction.

Visualization of 3D magnetohydrodynamic simulation results computed in parallel in this post. The visualization is done with VisIt 3.3.3 running on a Mac.

Introduction

Up to this article posted last month, I have confirmed that OpenMPI can be embedded in a Docker container and used for parallel computing on multiple nodes. In this post, I will use the Docker container created above to run tutorial 4 “Running 3D MHD with OpenMP and MPI” of Athena++ on multiple nodes.

Motivation

As I stated in this post yesterday, I was able to run a program using OpenMPI on a Docker container running on multiple nodes. I wanted to find out how much performance I could improve by using OpenMPI, so I decided to benchmark it. Actually, I had some difficulties this time as well, and I would be happy if that part is helpful for others.

Motivation

As previously mentioned in this post, I am moving forward with the goal of running Athena++ on multiple nodes. As a preliminary step, I have attempted to run a Docker container with OpenMPI configured on multiple nodes. I will post a summary of what I have done, as I had some difficulties and it may be helpful to others.

Introduction

In a previous post, I summarized the contents of the first tutorial “1D Hydorodynamics and MHD” after installing Athena++. This post is a continuation of that post and summarizes the contents of the tutorial that was executed to perform visualization and other tasks.

Introduction

I have been interested in trying out astrophysics-related simulations for some time, and had been checking out ENZO, GADGET, GIZMO, and others. I happened to know Athena, and when I looked into it, I found that Associate Professor Kengo Tomita of Tohoku University maintains a Japanese page and has some information in Japanese, so I decided to give it a try.

Here, I summarize the process of installing and running the tutorial, and post it.

Motivation

In this article, I ended on a negative note about quantization, but after a little research I reconsidered it as an interesting area and experimented with quantization, which I I summarize it here.