OpenCL线程代数库ViennaCL的使用

ViennaCL 介绍

http://viennacl.sourceforge.net/
ViennaCL is a free open-source linear algebra library for computations on many-core architectures (GPUs, MIC) and multi-core CPUs. The library is written in C++ and supports CUDA, OpenCL, and OpenMP (including switches at runtime).

ViennaCL是一个免费的开源线性代数库，用于多核架构(gpu, MIC)和多核cpu的计算。该库是用c++编写的，支持CUDA、OpenCL和OpenMP(包括运行时的开关)。

最新1.7版本的亮点。X发行系列是:

Fast sparse matrix-matrix multiplications, outperforming CUBLAS and MKL.
快速稀疏矩阵-矩阵乘法，优于CUBLAS和MKL。
Fine-grained parallel algebraic multigrid preconditioners for CPUs, Xeon Phis, and GPUs.
细粒度并行代数多网格预处理器的cpu, Xeon phi协处理器和gpu。
Fine-grained parallel incomplete LU factorization preconditioners for CPUs, Xeon Phis, and GPUs.
细粒度并行不完全LU分解预处理器，用于cpu, Xeon phi协处理器和gpu。

下载

http://viennacl.sourceforge.net/viennacl-download.html
下载连接如上，请有需要的朋友可以可以使用对应的相关的版本。
ViennaCL-1.7.1.tar.gz

编译

将下载好的源码解压

unzip ViennaCL-1.7.1.zip

会生成如下目录，进入build

zacha@Superman:ViennaCL-1.7.1$ ls
build      CL     CMakeLists.txt  examples  libviennacl  README  viennacl
changelog  cmake  doc             external  LICENSE      tests

执行cmake-gui ../ 然后点击Configure。
这时候会自动的在usr目录下寻找OpenCL 编译环境所需的头文件和库文件（libOpenCL.so）。如果没有请安装对应的显卡驱动相关的SDK, 如果是嵌入式板卡，请选择交叉编译，然后指定但对于所需的opencl的头文件和库文件。

制定好头文件路径和库文件路径，点击Generate。生成Makefile，然后执行make
或者参考build/README.txt
等待编译成功，移至对应平台即可。

使用

我们看到：
在编译完的代码examples下会有很多可执行的示例，供用户使用。

benckmarks

#./dense_blas-bench-opencl
----------------------------------------------
               Device Info
----------------------------------------------

Vendor:              Vivante Corporation
Type:                GPU 
Available:           1
Max Compute Units:   1
Max Work Group Size: 1024
Global Mem Size:     268435456
Local Mem Size:      32768
Local Mem Type:      2
Host Unified Memory: 1

Benchmark : BLAS
----------------
sCOPY : 2 GB/s
sAXPY : 2 GB/s
sDOT : 4 GB/s
sGEMV-N : 1.97 GB/s
sGEMV-T : 1.48 GB/s
sGEMM-NN : 0.246 GFLOPs/s
sGEMM-NT : 0.246 GFLOPs/s
sGEMM-TN : 0.246 GFLOPs/s
sGEMM-TT : 0.246 GFLOPs/s
----

Benchmark : BLAS
----------------
sCOPY : 0.195 GB/s
sAXPY : 0.196 GB/s
sDOT : 0.171 GB/s
sGEMV-N : 0.0303 GB/s
sGEMV-T : 0.0517 GB/s
sGEMM-NN : 0.00863 GFLOPs/s
sGEMM-NT : 0.234 GFLOPs/s
sGEMM-TN : 0.00868 GFLOPs/s
sGEMM-TT : 0.00863 GFLOPs/s
----
dCOPY : 0.381 GB/s
dAXPY : 0.377 GB/s
dDOT : 0.327 GB/s
dGEMV-N : 0.0596 GB/s
dGEMV-T : 0.101 GB/s
dGEMM-NN : 0.00797 GFLOPs/s
dGEMM-NT : 0.00774 GFLOPs/s
dGEMM-TN : 0.00821 GFLOPs/s
dGEMM-TT : 0.00797 GFLOPs/s

#./opencl-bench-opencl
----------------------------------------------
               Device Info
----------------------------------------------
Name:                Vivante OpenCL Device VIP8000-OI.8102.0000
Vendor:              Vivante Corporation
Type:                GPU 
Available:           1
Ma[ 5243.331300] VIP8000 SetPower 0 
x Compute Units:		 1
Max Work Group Size: 1024
Global Mem Size:     268435456
Local Mem Size:      32768
Local Mem Type:      2
Host Unified Memory: 1


----------------------------------------------
----------------------------------------------
## Benchmark :: OpenCL performance
----------------------------------------------

   -------------------------------
   # benchmarking single-precision
   -------------------------------
Time for building scalar kernels: 4e-06
Time for building vector kernels: 1.446
Time for building matrix kernels: 2.98157
Time for building compressed_matrix kernels: 1.88953
Time for 100000 entry accesses on host: 0.004118
Time per entry: 4.118e-08
Result of operation on host: 104839
Time for 100000 entry accesses via OpenCL: 35.0961
Time per entry: 0.000350961
Result of operation via OpenCL: 104839

bandwidth-reduction

#./bandwidth-reduction
-- Generating matrix --
 * Unknowns: 262144
 * Initial bandwidth: 8192
 * Randomly reordered bandwidth: 262051
-- Cuthill-McKee algorithm --
 * Reordered bandwidth: 6207
-- Advanced Cuthill-McKee algorithm --
 * Reordered bandwidth: 6207
-- Gibbs-Poole-Stockmeyer algorithm --
 * Reordered bandwidth: 6207
!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!

fft

Computing FFT Matrix
m: [4,8]((0,0,1,1,2,2,3,3),(0,1,1,2,2,3,3,4),(1,1,2,2,3,3,4,4),(1,2,2,3,3,4,4,5))
o: [4,8]((0,0,0,0,0,0,0,0),(0,0,0,0,0,0,0,0),(0,0,0,0,0,0,0,0),(0,0,0,0,0,0,0,0))
Done
m: [4,8]((0,0,1,1,2,2,3,3),(0,1,1,2,2,3,3,4),(1,1,2,2,3,3,4,4),(1,2,2,3,3,4,4,5))
o: [4,8]((32,40,-16,0,-8,-8,-9.53674e-07,-16),(-8,0,0,0,0,0,0,0),(0,-8,0,0,0,0,0,0),(-4.76837e-07,-8,0,0,0,0,0,0))
Transpose
m: [4,8]((0,0,1,1,2,2,3,3),(0,1,1,2,2,3,3,4),(1,1,2,2,3,3,4,4),(1,2,2,3,3,4,4,5))
o: [4,8]((0,0,0,1,1,1,1,2),(1,1,1,2,2,2,2,3),(2,2,2,3,3,3,3,4),(3,3,3,4,4,4,4,5))
---------------------
Computing FFT bluestein
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
Done
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
output_vec: [16](28,2.38419e-07,-4,9.65685,-4,4,-4,1.65685,-4,-3.2981e-07,-4,-1.65685,-4,-4,-4,-9.65685)
---------------------
Computing FFT 
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
Done
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
output_vec: [16](28,0,-4,9.65685,-4,4,-4,1.65685,-4,0,-4,-1.65685,-4,-4,-4,-9.65685)
---------------------
Computing inverse FFT...
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
output_vec: [16](0,0,1,4.56956e-08,2,-2.78181e-08,3,-1.64905e-07,4,0,5,-7.35137e-08,6,2.78181e-08,7,1.92723e-07)
---------------------
Computing real to complex...
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
output_vec: [16](0,0,0,0,1,0,0,0,2,0,0,0,3,0,0,0)
---------------------
Computing complex to real...
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
output_vec: [16](0,1,2,3,4,5,6,7,2,0,0,0,3,0,0,0)
---------------------
Computing multiply complex
input_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
input2_vec: [16](0,0,1,0,2,0,3,0,4,0,5,0,6,0,7,0)
Done
output_vec: [16](0,0,1,0,4,0,9,0,16,0,25,0,36,0,49,0)
---------------------
!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!

还有很多示例可以编译，大家可以自行探索。

OpenCL线程代数库ViennaCL的使用

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