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Fluid machinery parallel simulation program process mapping method based on genetic algorithm

A technology for fluid machinery and simulation programs, applied in the field of process mapping of fluid machinery parallel simulation programs based on genetic algorithms, can solve problems such as local optimal solutions, long time overhead for solving optimal mapping, low search efficiency, etc., and reduce communication cost, improve solution quality and solution speed, and improve execution efficiency

Active Publication Date: 2019-01-18
XI AN JIAOTONG UNIV
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Problems solved by technology

However, these methods are easy to fall into the local optimal solution and the search efficiency is low. When the process size of the parallel program increases, the time overhead for solving the optimal mapping is too long.

Method used

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  • Fluid machinery parallel simulation program process mapping method based on genetic algorithm
  • Fluid machinery parallel simulation program process mapping method based on genetic algorithm
  • Fluid machinery parallel simulation program process mapping method based on genetic algorithm

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Embodiment

[0065] Step A, when compiling the fluid machinery parallel simulation program, link the process communication instrumentation library, collect and record the communication information between MPI processes during the running of the program, including the size of messages transmitted between processes and the frequency of communication, and obtain a log file.

[0066] Step B, organize the communication information between each process from the log file obtained in step A, and establish a process communication mode matrix G∈R n×n , where the element g(i, j) represents the communication affinity between process i and process j, which is the combination of the total amount of inter-process communication and the communication frequency. In this embodiment, in order to facilitate the calculation of communication overhead, the communication affinity between processes is defined as formula (5), where volume i，j is the total amount of communication between process i and process j, p i...

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Abstract

The invention discloses a fluid machinery parallel simulation program process mapping method based on genetic algorithm, includes such steps as linking process communication stake library when fluid mechanical parallel simulation program is compiled, capturing communication information of MPI communication during program running, and obtaining log file with message size and communication frequencyof inter-process transmission; Constructing a process communication mode matrix according to the communication log file; constructing a communication distance matrix of computing unit to test the communication cost of computing resources applied by users; Defining the communication overhead model of parallel simulation programs for fluid machinery; using hybrid parallel genetic algorithm to solvethe optimal process mapping strategy; according to the optimal process mapping strategy obtained from the hybrid parallel genetic algorithm, statically binding the MPI process to the specified compute node, and rerunning the fluid mechanical parallel simulation program.

Description

technical field [0001] The invention belongs to the interdisciplinary field of computational fluid dynamics and computers, and in particular relates to a process mapping method for parallel simulation programs of fluid machinery based on genetic algorithms. Background technique [0002] Computational Fluid Dynamics (CFD, Computational Fluid Dynamics) is a subject that uses numerical calculation methods to directly solve the flow master equation to explain various flow phenomena. It is a typical high-performance numerical calculation application field. With the continuous advancement of CFD technology and the continuous expansion of the scale of supercomputer computing nodes, the physical processes and geometric models in the application field of fluid machinery that need to be simulated are becoming more and more complex, and the grid scale involved is also larger. The program uses 100,000 cores for simulation calculations. In the parallel simulation program of fluid machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
CPCG06N3/126G06F30/20G06F2111/06
Inventor 张兴军安伟华魏恒义赵俊芳张强龙董小社李靖波伍卫国邹年俊何峰
Owner XI AN JIAOTONG UNIV
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