Outline

Motivation

Much of modern software uses domain sockets for same-machine IPC. Such as PostGres, HyPer etc.

But how good are Domain sockets really?

Comparison of IPC Methods

Compare:

1. Domain Sockets
2. TCP Sockets
3. Shared Memory
4. FIFOs

Shared memory is the way to go, so how do we use it?

Basic Idea

Overwrite syscalls and redirect reads and writes to custom shared memory channels. LD_PRELOAD, no re-compilation!

Communication Model

Two channels, circular read/write buffers

escalation levels

Results

PostGres, Hyper

Isn't all of this obvious?

Problems we had

select/poll, keys, multi-process synchronization

Outlook

RDMA (Alex)