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poor compute shader performance
amazingman
Join Date: 8 May 18
Posts: 1
Posted: Tue, 2018-05-08 06:11
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Hi, recently we have developing a heterogeneous nerural network framework by shader storage buffer objects and compute shader of OpenGLES3.1 on Android. We encounted a depressing problem, when we get result through glMapBufferRange, the cost time in Adreno540 is even slower than in Mali T880, the sample code as follow:

glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, input_ssbo);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, output_ssbo);
glDispatchCompute(1, 1, 1);

glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, 0);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, 0);
glBindBuffer(GL_SHADER_STORAGE_BUFFER, output_ssbo);
float* buffer = (float*)glMapBufferRange(GL_SHADER_STORAGE_BUFFER, 0, sizeInBytes, GL_MAP_READ_BIT);
memcpy(out,buffer, sizeInBytes);

Please help us understand if something wrong and how to solve this problem, Thank you.

 

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