A thrust allocate error?

I am using Nvida HPC SDK (2022) to complie the follow code, the basic propuse of which is to sum a N*M matrix into a N vector.

#include <thrust/host_vector.h>
#include <thrust/device_vector.h>
#include <thrust/transform.h>
#include <thrust/execution_policy.h>
#include <thrust/execution_policy.h>
#include <thrust/fill.h>

constexpr unsigned int N = 2048, M = 2048;

int main(int argc, char* argv[]) {

	thrust::device_vector<double> g_vec1(N*M);
	thrust::device_vector<double> g_vec2(N);
	thrust::fill(thrust::device, g_vec1.begin(),g_vec1.end(),1.);

			device_vector<double>::iterator> g_it_vec(N);

	for (int i=0; i<N; i++)
		g_it_vec[i] = g_vec1.begin() + i*M;

		[](const auto& it) {
			return thrust::reduce(thrust::device,
				it, it+M,0.);});


when I run this code on the 3080Ti device, an error occurs when M > 2048 (or 1024 when I use complex):

temporary_buffer::allocate: get_temporary_buffer failed

temporary_buffer::allocate: get_temporary_buffer failed
terminate called after throwing an instance of ‘thrust::system::system_error’
what(): transform: failed to synchronize: cudaErrorLaunchFailure: unspecified launch failure
Aborted (core dumped)

How did this happen? Is it related to the 1024 maxium thread number of a block?
Or is there any standard means to reduce a matrix(2d array)?

I think you’ve been given the explanation on your cross-posting

1 Like

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.