Re: [boost] [compute] [OS X 10.11.5] [GeForce GT 750M] Segmentation fault

On Sun, May 22, 2016 at 10:32 PM, Prashant wrote:

Hi, Am trying to sort a vector on GPU (GeForce GT 750M) using example code which generates SEGV. However, it runs fine on Iris Pro (Intel(R) Core(TM) i7-4850HQ CPU).

We observe SEGV when size is 10 million. When the size is 5 million, following exception is thrown: boost/1_61_0/include/boost/compute/command_queue.hpp(453): Throw in function boost::compute::event boost::compute::command_queue::enqueue_write_buffer(const boost::compute::buffer &, size_t, size_t, const void *, const boost::compute::wait_list &) Dynamic exception type: boost::exception_detail::clone_impl > std::exception::what: Invalid Value

Another observation: if the size of vector is 50 million the sorting works fine, though the timings are worse than Iris Pro. Also, when is size is 100 million, the binary causes the OS to crash.

Compiler details: clang++ --version Apple LLVM version 7.3.0 (clang-703.0.31) Target: x86_64-apple-darwin15.5.0 Thread model: posix

OS: System Version: OS X 10.11.5 (15F34) Kernel Version: Darwin 15.5.0

Thanks for the report. I see you've also opened an issue [1] on GitHub, I'll follow up there. -kyle [1] https://github.com/boostorg/compute/issues/615