Default Design

Intel® Ethernet 800 Series Application Device Queues (ADQ)

Software Developer's Guide

ID	Date	Version	Classification
626536	04/03/2023		Public

By default, Memcached server has the following design:

It has one listener thread.

It includes N number of event worker threads that process sockets, for both read and write operations.

Each worker thread is assigned connections and runs its own epoll loop.

Memcached distributes connections to application threads using a round-robin based technique.

Following is the pseudo code for the default design:

Listener/main thread:

while(1) { child socket = Accept socket select application thread dispatch connection to thread select application worker thread enqueue connection to per thread connection queue }

'N' worker thread, which uses libevent for event management:

Initialize event object per thread Create new connection queue Create 'N' worker thread Each worker thread runs event loop (worker_libevent) Event_base_loop() /* Process sockets from connection queue */