I am working on optimizing a Single Producer Single Consumer (SPSC) queue in C++. The current implementation of my pop function is as follows:
bool pop(int& val) {
const size_t write_index = (write_index_->value).load(); // 1 cache miss here
const size_t read_index = (read_index_->value).load();
if (read_index == write_index) {
return false;
}
val = *(data + read_index); // 1 cache miss here
size_t next = read_index + 1;
(read_index_->value).store(next);
return true;
}
I’m observing two cache misses:
When fetching the write_index.
When fetching the data at read_index.
I want to optimize this to reduce the number of cache misses. Ideally, I would like to fetch both the write_index and the data in a single cache miss.
I thought about using prefetching techniques, but I’m not sure about the best approach for this scenario.
Is it possible to reduce the number of cache misses by fetching both write_index and data at read_index together?
Are there any specific data layout strategies or memory order considerations that can help in minimizing cache misses in this context?
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