alpha/alpha-benchmark/README.md

# Alpha Benchmark tool

The Alpha Benchmark Project is a Stress test tool, Test Alpha speed by simulating sending Omega events. This simulator sends a set of global transactions with three sub-transactions

```prop
SagaStartedEvent
TxStartedEvent
TxEndedEvent
TxStartedEvent
TxEndedEvent
TxStartedEvent
TxEndedEvent
SagaEndedEvent
```

## Basic Usage

```bash
java -jar alpha-benchmark-0.5.0-SNAPSHOT-exec.jar --alpha.cluster.address=0.0.0.0:8080 --w=50 --n=200000 --c=500
```

Output:

```bash
Benchmarking ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░

Warm Up                   500
Concurrency Level         500
Time taken for tests      113 seconds
Complete requests         200000
Failed requests           0
Requests per second       1769 [#/sec]
Time per request          283 [ms]

Percentage of the requests served within a certain time (ms)
50%   274.33
60%   276.00
70%   278.29
80%   280.14
90%   280.17
100%  282.51
2019-07-15 16:12:50.208  INFO 39338 --- [           main] o.a.s.p.a.benchmark.SagaEventBenchmark   : OK
```

## Command Line Options

```bash
  --n requests        Number of requests to perform
  --c concurrency     Number of multiple requests to make at a time
  --w warm-up         Number of multiple warm-up to make at a time
```

## Benchmarking Tips

Tuning Java Virtual Machines

```bash
java \
  -Xmx8g -Xms8g -Xmn4g \
  -Xss256k \
  -XX:PermSize=128m -XX:MaxPermSize=512m \
  -XX:+UseConcMarkSweepGC \
  -XX:+UseParNewGC \
  -XX:MaxTenuringThreshold=15 \
  -XX:+ExplicitGCInvokesConcurrent \
  -XX:+CMSParallelRemarkEnabled \
  -XX:SurvivorRatio=8 \
  -XX:+UseCompressedOops \
  -Dcom.sun.management.jmxremote \
  -Dcom.sun.management.jmxremote.port=9090 \
  -Dcom.sun.management.jmxremote.ssl=false \
  -Dcom.sun.management.jmxremote.authenticate=false \
  -jar alpha-server-0.5.0-SNAPSHOT-exec.jar \
  --spring.datasource.username=saga-user \
  --spring.datasource.password=saga-password \
  --spring.datasource.url="jdbc:postgresql://0.0.09.0:5432/saga?useSSL=false" \
  --spring.profile.active=prd \
  --alpha.feature.akka.enabled=true
```

Optimizing System Performance

```bash
ulimit -u unlimited
ulimit -n 90000
```