PyOpenCL January 2018

pyopencl@tiker.net

3 participants
3 discussions

by Zigfried Hampel-Arias

Hello all, I have a large (~500 MB) lookup table loaded as a numpy array for an embarrassingly parallel transport calculation. This is too large for constant memory, but I can load it into global memory, permitting all threads access to any element required. However each thread must grab a set of 4 float values at every transport step. I eventually want to move to accessing 9 such sets (36 floats) at each step to do some table interpolation. Are there any good PyOpenCL examples putting such a read-only table into image memory? I’m not sure how much performance gain moving to image mem there would be anyways. Anyone have a suggestion? Thanks, Zig ========================== Zigfried Hampel-Arias Physics PhD BAEF Postdoctoral Fellow IIHE zhampel(a)wipac.wisc.edu <mailto:zhampel@wipac.wisc.edu>

2 years, 5 months

Re: [PyOpenCL] Build from source on Linux Mint 18.3 (Ubuntu 16.04) can't find libOpenCl

by Andreas Kloeckner

Christian Hacker <christian.b.hacker(a)gmail.com> writes: > Used your recommendations on how to install OpenCL > <https://wiki.tiker.net/OpenCLHowTo> and compile PyOpenCL from source > <https://wiki.tiker.net/PyOpenCL/Installation/Linux> in a Python3.5 > virtualenv, using the reference ICD loader ocl-icd-libopencl1, nvidia ICD > nvidia-opencl-icd-387, and opencl-headers packages. I get this error during > the first compiler reference to OpenCL: You're missing the dev package: ocl-icd-opencl-dev (Note: not ocl-icd-dev, although that doesn't hurt) Andreas

2 years, 6 months

Re: [PyOpenCL] Build from source on Linux Mint 18.3 (Ubuntu 16.04) can't find libOpenCl

by Christian Hacker

Used your recommendations on how to install OpenCL <https://wiki.tiker.net/OpenCLHowTo> and compile PyOpenCL from source <https://wiki.tiker.net/PyOpenCL/Installation/Linux> in a Python3.5 virtualenv, using the reference ICD loader ocl-icd-libopencl1, nvidia ICD nvidia-opencl-icd-387, and opencl-headers packages. I get this error during the first compiler reference to OpenCL: x86_64-linux-gnu-gcc -pthread -fwrapv -Wall -O3 -DNDEBUG -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DPYOPENCL_USE_SHIPPED_EXT=1 -DPYGPU_PACKAGE=pyopencl -DPYGPU_PYOPENCL=1 -I/usr/include -Isrc/c_wrapper/ -I/usr/include/python3.5m -I/home/christianhacker/.virtualenvs/tdc/include/python3.5m -c src/c_wrapper/debug.cpp -o build/temp.linux-x86_64-3.5/src/c_wrapper/debug.o -std=gnu++11 x86_64-linux-gnu-g++ -pthread -shared -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-Bsymbolic-functions -Wl,-z,relro -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 build/temp.linux-x86_64-3.5/build/temp.linux-x86_64-3.5/pyopencl._cffi.o build/temp.linux-x86_64-3.5/src/c_wrapper/wrap_cl.o build/temp.linux-x86_64-3.5/src/c_wrapper/wrap_constants.o build/temp.linux-x86_64-3.5/src/c_wrapper/bitlog.o build/temp.linux-x86_64-3.5/src/c_wrapper/pyhelper.o build/temp.linux-x86_64-3.5/src/c_wrapper/platform.o build/temp.linux-x86_64-3.5/src/c_wrapper/device.o build/temp.linux-x86_64-3.5/src/c_wrapper/context.o build/temp.linux-x86_64-3.5/src/c_wrapper/command_queue.o build/temp.linux-x86_64-3.5/src/c_wrapper/event.o build/temp.linux-x86_64-3.5/src/c_wrapper/memory_object.o build/temp.linux-x86_64-3.5/src/c_wrapper/svm.o build/temp.linux-x86_64-3.5/src/c_wrapper/image.o build/temp.linux-x86_64-3.5/src/c_wrapper/gl_obj.o build/temp.linux-x86_64-3.5/src/c_wrapper/memory_map.o build/temp.linux-x86_64-3.5/src/c_wrapper/buffer.o build/temp.linux-x86_64-3.5/src/c_wrapper/sampler.o build/temp.linux-x86_64-3.5/src/c_wrapper/program.o build/temp.linux-x86_64-3.5/src/c_wrapper/kernel.o build/temp.linux-x86_64-3.5/src/c_wrapper/debug.o -L/usr/lib/i386-linux-gnu/ -lOpenCL -o build/lib.linux-x86_64-3.5/pyopencl/_ cffi.abi3.so -Wl,--no-as-needed /usr/bin/ld: cannot find -lOpenCL collect2: error: ld returned 1 exit status error: command 'x86_64-linux-gnu-g++' failed with exit status 1 Makefile:6: recipe for target 'all' failed make: *** [all] Error 1 I know my system knows that the library's there: I confirmed that the proper entries are in /etc/ld.so.conf.d/, and running locate libOpenCL returns /usr/lib/i386-linux-gnu/libOpenCL.so.1 /usr/lib/i386-linux-gnu/libOpenCL.so.1.0.0 /usr/lib/x86_64-linux-gnu/libOpenCL.so.1 /usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0 /usr/share/doc/ocl-icd-libopencl1/html/libOpenCL.html /usr/share/man/man7/libOpenCL.7.gz /usr/share/man/man7/libOpenCL.so.7.gz I tried specifying python configure.py --cl-inc-dir=/usr/include --cl-lib-dir=/usr/lib/i386-linux-gnu/ as well as python configure.py --cl-inc-dir=/usr/include --cl-lib-dir=/usr/lib/x86_64-linux-gnu/, no dice. Also tried setting LD_LIBRARY_PATH, didn't work. Any ideas? -- CH

2 years, 6 months

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PyOpenCL January 2018