The following CUDA Thrust program crashes:
#include <thrust/device_vector.h>
#include <thrust/extrema.h>
int main(void)
{
thrust::device_vector<int> vec;
for (int i(0); i < 1000; ++i) {
vec.push_back(i);
}
thrust::min_element(vec.begin(), vec.end());
}
The exception I get is:
Unhandled exception at 0x7650b9bc in test_thrust.exe: Microsoft C++
exception:thrust::system::system_error at memory location 0x0017f178..
In `checked_cudaMemcpy()` in `trivial_copy.inl`.
If I add #include <thrust/sort.h>
and replace min_element
with sort
, it does not crash.
I'm using CUDA 4.1 on Windows 7 64-bit, compute_20,sm_20 (Fermi), Debug build. In a Release build, I am not getting the crash and min_element finds the correct element.
Am I doing something wrong, or is there a bug in Thrust?
I can reproduce the error using debug mode targeting Compute Capability 2.0 (i.e nvcc -G0 -arch=sm_20
). The bug does not reproduce in release mode or when targeting Compute Capability 1.x devices, which generally suggests a code-generation problem instead of a bug in the library. Wherever the fault lies, I'd encourage you to submit a bug report so this issue gets the attention it deserves. In the meantime, I'd suggest compiling in release mode, which is more rigorously tested.