Advertisements Consider the following Python function to be parallelized, which utilizes an georeferenced ndarray (assembled from rioxarray) and a shapefile. This function uses both these datasets to generate map plots with Matplotlib/CartoPy, the dependent variable being changes in map domain extent. Note that code to govern cosmetic alterations to the plot for titles, etc. has… Read More Python Multiprocess Sharing Static Data Between Process Jobs

Advertisements I am currently studying CUDA and learned that there are global memory and shared memory. I have checked the CUDA document and found that GPUs can access shared memory and global memory using ld.shared/st.shared and ld.global/st.global instructions, respectively. What I am curious about is what instruction is used to load data from global memory… Read More In CUDA, what instruction is used to load data from global memory to shared memory?

Advertisements Example: import multiprocessing as mp counter = mp.Value(‘i’, 0) def test_fun(i): global counter with counter.get_lock(): counter.value += 1 def main(): global counter with mp.Pool(4) as p: result = p.map(test_fun, range(4)) print(counter.value) if __name__ == "__main__": main() The expected output is 4, since the value is shared but outputs 0 on Mac. It works when… Read More How do I use multprocessing.Value (or other shared resources) on Mac with Spawn?

Advertisements I have tried this fragment shader. but the result is unexpected. void main() { float test; if(gl_FragCoord.x==300.0){ test=1.0; } gl_FragColor = vec4(test, 1,1,1); } This program makes all fragments white colored. But it’s unexpected because shaders run asynchronously for each fragment. Note that the colour is dependent to value of test in if block.… Read More sharing variables in fragment shader GLSL

Advertisements I’m currently working on a programm that has a shared memory and semaphores. However I have issues with initializing them. Whenever I wanna open them (whilst having the O_EXCL flag active I keep getting erros. That should mean they are already open when starting but I have no idea how or why. static sem_t… Read More Semaphores and shared memory already opened / Problem with O_EXCL flag