PaCaR: Improved Buffered I/O Locality on NUMA Systems with Page Cache Replication

Modern systems featuring multiple sockets suffer from the non-uniformity of performance of their memory accesses. Accessing memory of a remote node can lead to doubled latencies and halved bandwidth. This is particularly critical for I/O-intensive applications relying on the Linux page cache, where locality is paramount. Existing solutions migrating threads or memory across nodes fail to address the issue with highly parallel workloads, where a small working set is constantly accessed by multiple threads across nodes.