Hi,
Last thing from me for the night, but I've just swapped to using async_
then fast_copy instead of plain old copy for vectors -- and both give me
a segfault using nvidia's libopencl. Is there anything debuggable in
this case, since the damn thing is closed source? The backtrace is:
#0 0x00007ffff14def62 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#1 0x00007ffff14756fd in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#2 0x00007ffff143a113 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#3 0x00007ffff143a9a9 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#4 0x00007ffff14e27bd in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#5 0x00007ffff14e4b0d in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#6 0x00007ffff14f4ff9 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#7 0x00007ffff14f5b23 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#8 0x00007ffff14ee604 in ?? () from
/usr/lib/nvidia-319/libnvidia-opencl.so.319.32
#9 0x00007ffff2dec175 in memory_write (async=<optimised out>,
ptr=0x7fffffffd5b8,
bytes_to_copy=8192, dst_offset=0, dst_buffer=...)
at /home/toby/src/viennacl/pyviennacl-dev/viennacl/backend/opencl.hpp:109
#10 viennacl::backend::memory_write (dst_buffer=..., dst_offset=0,
bytes_to_write=8192, ptr=0x7fffffffd5b8, async=<optimised out>)
at /home/toby/src/viennacl/pyviennacl-dev/viennacl/backend/memory.hpp:235
#11 0x00007ffff2e0fdde in
fast_copy<boost::numeric::ublas::scalar_vector<double, std::allocator<double>
>::const_iterator, double, 1u> (gpu_begin=..., cpu_end=...,
cpu_begin=...)
at /home/toby/src/viennacl/pyviennacl-dev/viennacl/vector.hpp:1435
I haven't tried not using a boost scalar_vector -- maybe that's got
something to do with it, but I don't know enough about the underlying
implementations to tell a priori.
Bonne nuit and schalf gut,
Toby
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