Dynamic shared memory can not allocate problem(on 3050PC)

Hi! I want to use 49KB shared memory in 3050 per block, so I have to use dynamic shared memory and follow official guide, but still can no work. Anyone can kindly find my bug? Thank you!!

using namespace std;
#include <cstdint>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <vector>
#include "cuda_runtime.h"
__global__  void sgemm_128x128x8(){
	if (threadIdx.x == 0 && blockIdx.x==0 && blockIdx.y==0) {
	extern __shared__ float smem[];
	float* smem_a = smem;
	float* smem_b = (float*)&smem_a[256*8];
	smem_a[threadIdx.x * 8] = threadIdx.x/3;
int main(){
	int maxbytes = 49*1024; 
	cudaFuncSetAttribute(sgemm_128x128x8, cudaFuncAttributeMaxDynamicSharedMemorySize, maxbytes);
	sgemm_128x128x8 << <1, 256, 49 * 1024 * sizeof(float) >> > ();

I suggest adding cudaDeviceSynchronize at the end of main, and proper CUDA error checking.

This will probably show an invalid kernel launch configuration. You want to use maxbytes shared memory, not maxbytes * sizeof(float).

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