CN113297729A - Parallel simulation entity partitioning method based on entity types - Google Patents
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Abstract
The invention provides a parallel simulation entity partitioning method based on entity types, which comprises the steps of generating all entities; constructing a two-dimensional linked list of the entity according to the type information of the entity; based on the entity type, dividing tasks; each process performs logical computations. Compared with the original partitioning method, the method has better parallel performance in a large-scale complex simulation world with various entities.
Description
Technical Field
The invention belongs to the technical field of computer simulation, and particularly relates to a time step driven entity type-based parallel simulation entity partitioning method.
Background
Computer simulation refers to a technical means of simulating the real world by using a computer, and is a very important research direction in the field of computers at present. In time-step driven simulation, entities are the fundamental units that make up the simulation world. The number of entities in the simulation world is often limited by hardware resources of a single computer, so that the simulation usually uses a parallel programming model of message passing to divide the simulated entities into a plurality of computing nodes for computation, and then synchronizes the states of the entities in the simulation world by means of remote communication. Entity partitioning refers to the process of partitioning a simulation entity into various compute nodes. The result of the entity partitioning will directly determine the computational load on each node. When the load of each node is balanced, the waiting time required by the subsequent communication synchronization process is shorter; on the contrary, when the loads of the nodes are not balanced, the performance of the whole simulation is limited by the node with the slowest calculation. In the simulation of a complex world, a large-scale and refined entity model, the types of entities are more, and the calculation tasks generated by different types of entities in the simulation are different. Therefore, when parallel simulation of a large-scale and refined entity model in a complex world is performed, an entity division without distinction generates a load imbalance problem, which causes high communication synchronization overhead during parallel, thereby causing low simulation efficiency and insuring simulation instantaneity.
Disclosure of Invention
Technical problem to be solved
The invention provides a parallel simulation entity partitioning method based on entity types, which aims to solve the technical problem of unbalanced load generated by a traditional entity partitioning method during parallel simulation.
(II) technical scheme
In order to solve the technical problem, the invention provides a parallel simulation entity partitioning method based on entity types, which comprises the following steps:
s1, generating all entities
Calling a corresponding C + + class constructor according to the entity class to generate an entity object;
s2, constructing a two-dimensional entity linked list according to entity types
In a two-dimensional entity linked list of a parallel entity data structure, a first dimension is indexed according to entity types, and a second dimension is indexed according to entity numbers;
s3, dividing tasks based on entity types
Taking out a current two-dimensional entity type linked list, and dividing a task for one entity type according to the entity quantity of the type according to the parallelism; taking out the next entity type; if the entity type is not empty, taking out the entity linked list of the type and dividing; otherwise, the division is finished;
s4, each process performs logic calculation
According to different types of entities, executing each frame of simulation logic calculation function of corresponding types to drive the simulation of the entities;
s5, synchronous calculation results of each process
And each process synchronizes the simulation state of the entity on the process to other processes according to the entity calculation result which is respectively responsible for calculation.
Further, in step S3, when dividing the task by the number of entities, the division is performed uniformly for the parts that cannot be divided evenly after each type of division.
Further, in step S3, each process synchronizes the simulation state of the entity on the process to other processes through the MPI set communication statement with the calculation result of the entity in charge of calculation.
(III) advantageous effects
The invention provides a parallel simulation entity partitioning method based on entity types, which comprises the steps of generating all entities; constructing a two-dimensional linked list of the entity according to the type information of the entity; based on the entity type, dividing tasks; each process performs logical computations. Compared with the original partitioning method, the method has better parallel performance in a large-scale complex simulation world with various entities.
Drawings
FIG. 1 is a flowchart of a method for partitioning parallel simulation entities based on entity types according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a two-dimensional linked list of entities in an embodiment of the present invention;
FIG. 3 is a diagram illustrating task partitioning according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The embodiment provides a parallel simulation entity partitioning method based on entity types, and the flow is shown in fig. 1, and specifically includes the following steps:
s1, generating all entities
And calling a corresponding C + + class constructor according to the entity class to generate an entity object.
S2, constructing a two-dimensional entity linked list according to entity types
As shown in fig. 2, in the two-dimensional entity linked list of the parallel entity data structure, the first dimension is indexed according to the entity type, and the second dimension is indexed according to the entity number.
S3, dividing tasks based on entity types
As shown in fig. 3, the task division includes: taking out a current two-dimensional entity type linked list; according to the parallelism, dividing a task for one entity type according to the number of entities of the type; taking out the next entity type; if the entity type is not empty, taking out the entity linked list of the type and dividing; otherwise, the division is finished. When the tasks are divided according to the number of the entities, the parts which cannot be divided completely after each type of division are divided uniformly.
S4, each process performs logic calculation
And executing each frame of simulation logic calculation function of the corresponding type according to different types of the entities to drive the simulation of the entities.
S5, synchronous calculation results of each process
And each process synchronizes the simulation state of the entity on the process to other processes through the MPI set communication statement according to the entity calculation result which is respectively responsible for calculation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A parallel simulation entity partitioning method based on entity types is characterized by comprising the following steps:
s1, generating all entities
Calling a corresponding C + + class constructor according to the entity class to generate an entity object;
s2, constructing a two-dimensional entity linked list according to entity types
In a two-dimensional entity linked list of a parallel entity data structure, a first dimension is indexed according to entity types, and a second dimension is indexed according to entity numbers;
s3, dividing tasks based on entity types
Taking out a current two-dimensional entity type linked list, and dividing a task for one entity type according to the entity quantity of the type according to the parallelism; taking out the next entity type; if the entity type is not empty, taking out the entity linked list of the type and dividing; otherwise, the division is finished;
s4, each process performs logic calculation
According to different types of entities, executing each frame of simulation logic calculation function of corresponding types to drive the simulation of the entities;
s5, synchronous calculation results of each process
And each process synchronizes the simulation state of the entity on the process to other processes according to the entity calculation result which is respectively responsible for calculation.
2. The entity type-based parallel simulation entity division method according to claim 1, wherein in the step S3, when the tasks are divided by the number of entities, the division is performed uniformly for the parts that cannot be divided exactly after each type of division.
3. The entity partitioning method for parallel simulation based on entity types as claimed in claim 1, wherein in step S3, each process synchronizes the simulation state of the entity on the process to other processes through MPI set communication statements, with the entity computation results that each process is responsible for computation.
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