A Tool for Fire Dynamics Simulator Speed-Up 🚀 and Optimization Using MPI Optimization Tool—Achieve Faster Results with Minimal Effort! #FDS #CFD #Simulation #cfdanalysis

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Optimizing Mesh Load Distribution in Fire Dynamics Simulator (FDS)

In large-scale simulations with FDS, efficient utilization of computational resources is crucial. The default behavior—assigning structured meshes to MPI processes individually—can lead to uneven workloads and suboptimal performance. This guide delves into the importance of mesh optimization and introduces a powerful solution through an MPI Optimization Tool available at StreamCFD Tools.

Watch Our YouTube Tutorial

To better understand how to use the MPI Optimization Tool effectively, check out our comprehensive tutorial:

Challenges in Default Mesh Assignment

1. Uneven Load Distribution:

   • FDS's default configuration assigns each structured mesh independently, leading to disparities where some processes handle more cells than others, resulting in bottlenecks.

2. Constraints on Number of Meshes:

   • The number of meshes is limited by the logical processors available, potentially restricting simulation capabilities unless manually adjusted.

3. CPU Utilization Inefficiency:

   • Discrepancies in cell distribution across MPI processes can cause significant CPU wastage, necessitating costly hardware upgrades to handle large-scale simulations effectively.

4. Hardware Configuration Variability:

   • Simulations optimized for one system may not perform well on another due to differing configurations, highlighting the need for adaptable load balancing.

Introducing the FDS MPI Optimization Tool

Available at StreamCFD Tools, the MPI Optimization Tool is designed to enhance simulation efficiency by intelligently redistributing computational loads across processes. Here's how it works:

Step-by-Step Process

1. Upload Your FDS Input File:

   • Begin by uploading your .fds file, generated using PyroSim, BlenderFDS, or manually crafted inputs.

2. Initial Optimization with Default Settings:

   • Click "Optimize" to analyze the input and adjust MPI processes for improved CPU utilization and balanced cell distribution across all processors.

3. Customizing Optimization Preferences:

   • Adjust optimization settings through two main options:

     • MPI Process Control:

       • Auto Mode: Automatically sets based on the largest mesh.
       • Fixed Mode: Allows users to set a maximum number of MPI processes, facilitating resource sharing with other applications.

     • Speed vs. Efficiency Preference:

       • Speed Mode focuses on reducing execution time by minimizing cell count imbalance.
       • Efficiency Mode aims for even distribution across all processes, ideal when running multiple simulations simultaneously.

4. Download the Optimized FDS File:

   • Obtain an optimized .fds file with updated MPI process recommendations to run your simulation efficiently.
     

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