koron / java-lmdb-playground

lmdbjni playground

Lmdb playground

Test implementation of longest prefix match using lmdbjni.

lmdb JNI

• Github: https://github.com/deephacks/lmdbjni
• Javadoc: http://deephacks.org/lmdbjni/apidocs/index.html

Benchamrk

How to run benchmark

$ gradle run

Benchmark results

2015/09/09 version

HitRate:0.10 KeyCount:100000 KeyLen:128 ValLen:128
  no-suffix, no-tx - QPS:221559.29 HitRate:0.100
  no-suffix, with-tx - QPS:250753.34 HitRate:0.100
  with-suffix, no-tx - QPS:203924.75 HitRate:0.100
  with-suffix, with-tx - QPS:246871.87 HitRate:0.100
  get-exact, no-tx - QPS:734347.91 HitRate:0.100
  get-exact, with-tx - QPS:930207.52 HitRate:0.100
HitRate:0.50 KeyCount:100000 KeyLen:128 ValLen:128
  no-suffix, no-tx - QPS:246747.14 HitRate:0.499
  no-suffix, with-tx - QPS:283585.96 HitRate:0.501
  with-suffix, no-tx - QPS:202871.14 HitRate:0.499
  with-suffix, with-tx - QPS:222302.44 HitRate:0.500
  get-exact, no-tx - QPS:785039.09 HitRate:0.500
  get-exact, with-tx - QPS:960080.41 HitRate:0.500
HitRate:0.90 KeyCount:100000 KeyLen:128 ValLen:128
  no-suffix, no-tx - QPS:259878.37 HitRate:0.900
  no-suffix, with-tx - QPS:250179.26 HitRate:0.900
  with-suffix, no-tx - QPS:204256.73 HitRate:0.899
  with-suffix, with-tx - QPS:218295.46 HitRate:0.900
  get-exact, no-tx - QPS:756443.89 HitRate:0.900
  get-exact, with-tx - QPS:965200.35 HitRate:0.900

How to use LongestPrefixMatch

Copy one or two *.java files to your project:

• LongestPrefixMatch.java
• (OPTION) LMDBUtils.java

(OPTION) Copy *.jar files to your project.

Then you can use LongestPrefixMatch#match for the purpose.

LongestPrefixMatch.match(env, db, "foobar");

To obtain env and db easily, you could use LMDBUtils#runNewEnv too. Please check below example:

LMDBUtils.runNewEnv("/var/db/my_prefix_data", false, (env, db) -> {
  LongestPrefixMatch.match(env, db, "foobar");
});

License

This project and its all contents are distributed under Apache License 2.0 See LICENSE for details.