On Aug 29, 2014 8:26 PM, "Zhigang Gong" <<a href="mailto:zhigang.gong@gmail.com">zhigang.gong@gmail.com</a>> wrote: > > I guess you may only change the kernel. Please also replace all the double with float in the cl-demo.c.Then rebuild and run it again. I just tried, and it works well. > > > _______________________________________________ > Beignet mailing list > <a href="mailto:Beignet@lists.freedesktop.org">Beignet@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/beignet">http://lists.freedesktop.org/mailman/listinfo/beignet</a> > How about this program? It has no double. C always prints zero. It's pyopencl. import pyopencl as cl import numpy import sys import time class CL(object): def __init__(self, size=10): self.size = size self.ctx = cl.create_some_context() self.queue = cl.CommandQueue(self.ctx) def load_program(self): fstr=""" __kernel void part1(__global float* a, __global float* b, __global float* c) { unsigned int i = get_global_id(0); c[i] = a[i] + b[i]; } """ self.program = cl.Program(self.ctx, fstr).build() def popCorn(self): mf = cl.mem_flags self.a = numpy.array(range(self.size), dtype=numpy.float32) self.b = numpy.array(range(self.size), dtype=numpy.float32) self.a_buf = cl.Buffer(self.ctx, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=self.a) self.b_buf = cl.Buffer(self.ctx, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=self.b) self.dest_buf = cl.Buffer(self.ctx, mf.WRITE_ONLY, self.b.nbytes) def execute(self): self.program.part1(self.queue, self.a.shape, None, self.a_buf, self.b_buf, self.dest_buf) c = numpy.empty_like(self.a) cl.enqueue_read_buffer(self.queue, self.dest_buf, c).wait() print ( "a", self.a) print ( "b", self.b) print ( "c", c ) def add(s=10) : starttime = time.clock() matrixmul = CL(s) matrixmul.load_program() matrixmul.popCorn() matrixmul.execute() endtime = time.clock() print s, endtime - starttime if __name__ == '__main__': #add(1) #add(2) #add(3) #add(4) #add(5) add(50) add(500) add(5000) add(50000) add(500000) #add(10000000)