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spring-messaging-demo/broker-comparison/docs/output/footprint.txt
Ankur Mhatre e1f8aa7402 Add the broker-comparison module
Kafka, RabbitMQ and Pulsar measured side by side on ordering, replay and
consumer scaling by driving the three client libraries directly, plus an
operational-footprint measurement of each broker's own distribution.

Nine tests, three brokers started without Docker, and every number in the
documentation regenerated by scripts/run-all.sh.
2026-09-01 23:31:51 +05:30

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== Operational footprint, measured on one 2-core / 3.8 GB Linux box ==
Each broker started from its shipped distribution with default configuration and a
700 MB heap cap, on Temurin JDK 21. Times are one sample on a small box: treat them as
orders of magnitude, not as a benchmark.
broker : kafka
time from launch to first
accepted connection : 10035 ms
resident memory at idle : 333 MB
server processes : 1
listening ports : 9092 (broker), 9093 (controller)
unpacked distribution size : 135 MB
settings in shipped default
configuration file : 24 (server.properties)
broker : rabbit
time from launch to first
accepted connection : 15053 ms
resident memory at idle : 115 MB
server processes : 1
listening ports : 5672 (AMQP), 4369 (epmd), 25672 (inter-node)
unpacked distribution size : 26 MB
settings in shipped default
configuration file : 0 (rabbitmq.conf.example)
epmd processes : 1
NOTE: RabbitMQ ships no configuration file at all. rabbitmq.conf.example is
entirely commented out and the boot log records "Config file(s): (none)".
Everything in that file is documentation, not a default.
broker : pulsar
time from launch to first
accepted connection : 20801 ms
resident memory at idle : 610 MB
server processes : 1
listening ports : 6650 (binary), 8080 (admin/REST), 2181 (ZooKeeper)
unpacked distribution size : 344 MB
settings in shipped default
configuration file : 357 (standalone.conf)