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Sparse matrix data storage method based on ground power unit (GPU)

A data storage and sparse matrix technology, applied in the field of GPU-based sparse matrix data storage, can solve problems such as wasted computing resources and unbalanced load, and achieve the effect of reducing the variation of row length, avoiding thread idling, and reducing reduction steps.

Inactive Publication Date: 2015-03-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a sparse matrix data storage method based on GPU, which adopts a storage strategy of segmented row merging, which can solve the problems of unbalanced load and waste of computing resources caused by the SpMV method on the CUDA architecture, Thereby improving the computing performance of SpMV

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  • Sparse matrix data storage method based on ground power unit (GPU)
  • Sparse matrix data storage method based on ground power unit (GPU)
  • Sparse matrix data storage method based on ground power unit (GPU)

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0017] Such as figure 1 Shown, the data storage format SC-CSR generation method of the present invention is:

[0018] (1) The CPU reads the matrix file and converts it into a sparse row compression format;

[0019] (2) Calculate the number of non-zero elements in each row in the sparse row compression format, and store it in the array length[];

[0020] (3) sort the array length[] in ascending order;

[0021] (4) According to the number of non-zero elements in each row in the array length[], the array length[] is divided into [0,8), [8,16), [16,32), [32,+ ∞) four segments;

[0022] (5) counter i=0 is set, and initialization array c[4]={32,16,8,4};

[0023] (6) judge whether the number of rows that the i-th paragraph includes is divided by c[i] greater than the threshold of GPU full load operation, if not, then proceed to step (7), if so, then proceed t...

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Abstract

The invention discloses a sparse matrix data storage method based on a ground power unit (GPU). The method comprises the following steps of: 1), sequencing the line length array length [] according to ascending order; 2), classifying the array length [] into four sections of [0, 8), [8, 16), [16, 32), [32, +infinity) according to the number of every line of non-zero element; respectively combining the 32nd, 16th, 8th, 4th lines in every section; 3], zeroizing the line in every data section and performing the line filling operation on every data section, wherein the element of the filled line is zero completely; 4], generating three one-dimensional arrays of cval [], ccol_ind [], crow_ptr [] of the SC-CSR format. In the method of the invention, the line length change amplitude of every line is reduced via segment treatment, thereby reducing the load unbalance between the thread bunch and the thread block; the adjacent lines are staggered and combined to avoid the resource waste of the thread bunch calculation when the non-zero element is less than 32, and to improve the efficiency of joint access of the CUDA display memory and decrease the step of calculating kernel and reducing lines, and therefore obviously improving the calculating performance of the vector multiplication of the sparse matrix.

Description

technical field [0001] The present invention relates to a data storage method, more specifically, the present invention relates to a GPU-based sparse matrix data storage method. Background technique [0002] In scientific computing and practical applications such as signal processing and image processing, large sparse matrices often appear. Therefore, efficient sparse matrix calculation has become an important and challenging research topic. Sparse Matrix-Vector Multiplication (SpMV for short) is the main computing operation in sparse matrix computing. Due to its extremely irregular storage access mode and the limitation of memory bandwidth during the computing process, its actual operating performance is low. Seriously affect the efficiency of sparse matrix calculation and related applications. [0003] Compressed Sparse Row (CSR for short) is the most widely used sparse matrix storage format. SpMV based on the CSR format and accelerated by the Compute Unified Device Arc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/16
Inventor 金海郑然胡侃曾敬翔冯晓文
Owner HUAZHONG UNIV OF SCI & TECH
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