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Blazing Fast

RESTHeart has been designed and developed with a focus on lightness and performance. This section presents the performance test results gathered by the SoftInstigate development team.

IMPORTANT: Starting from RESTHeart version 8, Virtual Threads, a feature introduced in Java 21 via JEP 444, are utilized. These lightweight threads provide significant performance improvements and simplify concurrent programming.

Test Outcome in a Nutshell

With RESTHeart, you can serve 2.6 million authenticated requests on the MongoDB REST API in just 5 minutes using a single server with only 4 cores.

MongoDB REST API Performance

This test evaluates the throughput and latency of performing GET requests on a MongoDB collection using the RESTHeart REST API.

The requests are authenticated using Basic Authentication and the mongoRealAuthenticator (which authenticates users defined in a MongoDB collection) to simulate real-world usage scenarios.

The following startup log message shows the Threads configuration used in the test:

10:56:49.167 [main] INFO  org.restheart.Bootstrapper - Available processors: 4, IO threads: 1, worker scheduler parallelism (auto detected): 3, worker scheduler max pool size: 256

The log message highlights the following threads setup:

  • Available processors: 4

  • IO threads: 1

  • worker scheduler parallelism: 3

  • worker scheduler max pool size: 256

The Virtual Threads are unlimited and are executed by the JVM using 3 platform threads. (Note that these are not the default values that are: io-threads=number of cores and worker-threads-scheduler-parallelism=1.5*number of cores).

The following screenshot shows the result of a performance test measured with the monitoring feature or RESTHeart that allows plotting data with Prometheus.

Here we have the average rate of GET /coll requests executed with the performance tool wrk. The requests retrieve the documents stored in a MongoDB collection using the REST API. The average rate grows up to about 8,700 Requests/sec on a c7a.xlarge AWS EC2 instance (with 4 cores).

rest api test

This is the output of wrk, showing a throughput of 8,690 Requests/sec, an amazing total of 2.61 millions GET requests executed in 5 minutes 🚀 and an average latency of 18,34ms (75% percentile) with a JSON payload of 411 bytes.

$ wrk -c 128 -t 8 -d 300 --latency --timeout 1m -s get.lua'{"links.url":{"$regex":".*pach.*"}}'
Running 5m test @{"links.url":{"$regex":".*pach.*"}}
  8 threads and 128 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    14.97ms    6.99ms 138.69ms   75.41%
    Req/Sec     1.09k    74.63     1.73k    72.94%
  Latency Distribution
     50%   14.06ms
     75%   18.34ms
     90%   23.19ms
     99%   37.80ms
  2607924 requests in 5.00m, 3.33GB read
Requests/sec:   8690.23
Transfer/sec:     11.37MB

Change Streams

Measure RESTHeart’s notification throughput while n Websockets are listening for targeted notifications. RESTHeart will process 180 POSTs in 60 seconds while testing (3 RPS) and every client will wait until all notification have been received.

change stream test

Observing the graph, RESTHeart delivers almost real-time notification for a very huge amount of clients:

Clients TPS Mean Notification Time (333ms = Real Time)