Overview

This project contains simple set of performance micro-benchmarks, using excellent JMH package.

Status

Has been used since Jackson 2.4 to track performance changes: see various results-pojo-2.x-home.txt files for numbers.

Usage

Tests usually run with

run-mediaitem.sh

or directly with something like

java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadVanilla.*PojoMediaItem.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1

(see results-pojo-2.13-home.txt and others for specific invocations used for each group of numbers)

Profiling

Can use

./profile-mediaitem.sh

to use basic JMH settings over runs.

Test sets

POJO: MediaItem

MediaItem POJO comes from: https://github.com/eishay/jvm-serializers tests suite. Test input generated is about 300 bytes as JSON, and between 200 and 500 bytes across other formats (converted from JSON which is considered canonical).

Settings to run tests include:

• Standard: java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadVan.PojoMedia." -wi 4 -w 1 -i 5 -r 1 -f 9 -t 1
• Afterburner: java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadAfter.PojoMedia." -wi 4 -w 1 -i 5 -r 1 -f 9 -t 1

POJO: Currency (floating-point (double))

Currency POJO, and data file ./json/USD.json (about 2kB) come from Awesome JSON Datasets.

Settings to run tests include:

* Default/JSON: java -Xmx256m -jar target/microbenchmarks.jar ".*JsonStdReadVanilla.readCurrencyPojoDefault.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1
* FastFP/JSON: java -Xmx256m -jar target/microbenchmarks.jar ".*JsonStdReadVanilla.readCurrencyPojoFast.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1
* All: java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadVanilla.readCurrencyPojo.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1

POJO: Currency (BigDecimal)

Same as above, but instead of reading as double values are read as BigDecimal. Run using

* Default/JSON: java -Xmx256m -jar target/microbenchmarks.jar ".*JsonStdReadVanilla.readCurrencyBigDefault.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1
* FastFP/JSON: java -Xmx256m -jar target/microbenchmarks.jar ".*JsonStdReadVanilla.readCurrencyBigFast.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1
* All: java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadVanilla.readCurrencyBig.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1