Messaging Module

The Messaging module benchmarks the SMA (Simple Messaging Architecture) layer, which provides publish-subscribe messaging abstractions on top of the link layer.

Overview

The SMA layer adds messaging semantics including:

• Channel-based pub/sub

• Message routing

• Quality of Service (QoS) levels

• Multicast support

This benchmark measures the overhead of these abstractions compared to raw link layer performance.

Test Programs

Sender

Class: com.neeve.perf.sma.Sender

Publishes messages to a channel.

Receiver

Class: com.neeve.perf.sma.Receiver

Subscribes to and receives messages from a channel.

Running Benchmarks

Basic Pub/Sub Test

On Receiver Machine:

$JAVA_HOME/bin/java -cp "libs/*" com.neeve.perf.sma.Receiver \
  --channel test.channel \
  --descriptor "tcp://0.0.0.0:5000"

On Sender Machine:

$JAVA_HOME/bin/java -cp "libs/*" com.neeve.perf.sma.Sender \
  --channel test.channel \
  --descriptor "tcp://receiver.example.com:5000" \
  --count 1000000 \
  --rate 100000

Interpreting Results

The SMA layer adds minimal overhead over the link layer:

• Link Layer: ~10µs

• SMA Layer: ~12-15µs

• Overhead: ~2-5µs for routing and QoS

Quality of Service

Guaranteed Delivery

Ensures all messages are delivered in order:

--qos guaranteed

Characteristics:

• Reliable delivery

• In-order processing

• Flow control

• Slightly higher latency

Best Effort

Allows message loss for lower latency:

--qos besteffort

Characteristics:

• Lower latency

• Higher throughput

• May lose messages under load

Next Steps

• Review Link Module for transport layer benchmarks

• Review AEP Module for end-to-end benchmarks

• Return to Modules Overview for other modules