About PRNG-Performance

A simple independent comparison of several Pseudo Random Number Generators in Java. The newest Version of this Test is based on JMH, a library for creating benchmarks on the JVM.

How to Run

Windows

.\mvnw.cmd clean compile exec:java

Linux

./mvnw clean compile exec:java

Algorithms

• java.util.Random
• SplittableRandom
• Other Alorithms using dsiutils
• In the 2024 results I now included some of the JDK 17 java.util.random package algorithms.

Results 2024

These are the results from my PC running Ryzen 5 5600G and OpenJDK 64-Bit Server VM Temurin-17.0.12+7. Raw results in results2.txt.

Original intention was to run on Java 21, oops :).

Integer

Algorithm	Mode	Cnt	Runtime	Error	Units
Jdk8SplitableRandom	sample	9613821	28,917	± 0,070	ns/op
JdkUtilRandom	sample	8903706	33,501	± 0,168	ns/op
JdkXoroshiro128++	sample	8852287	29,989	± 0,071	ns/op
JdkXoshiro256++	sample	7260221	30,805	± 0,475	ns/op
SplitMix64	sample	8921026	28,675	± 0,072	ns/op
XorShift1024Star	sample	6944177	29,480	± 0,094	ns/op
XorShift128Plus	sample	8962997	30,083	± 0,077	ns/op
Xoroshiro128Plus	sample	8981128	29,826	± 0,075	ns/op

Results 2022

These are the results from my PC running Ryzen 5 5600G and OpenJDK 64-Bit Server VM Temurin-17.0.2+8. Raw results in results.txt.

Biggest difference to Java 8 and Java 17, is that the difference in runtime has significantly shrunk.

Integer

Algorithm	Mode	Cnt	Runtime	Error	Units
Jdk8SplitableRandom	sample	8158648	29,828	± 0,116	ns/op
JdkUtilRandom	sample	6793191	33,706	± 0,121	ns/op
SplitMix64	sample	8852287	29,133	± 0,077	ns/op
XorShift1024Star	sample	6938803	30,095	± 0,108	ns/op
XorShift128Plus	sample	8148799	29,943	± 0,086	ns/op
Xoroshiro128Plus	sample	8946210	29,880	± 0,086	ns/op

Longs

Algorithm	Mode	Cnt	Runtime	Error	Units
Jdk8SplitableRandom	sample	9052540	29,250	± 0,091	ns/op
JdkUtilRandom	sample	7850157	34,449	± 0,100	ns/op
SplitMix64	sample	8942673	29,245	± 0,067	ns/op
XorShift1024Star	sample	6894581	29,382	± 0,102	ns/op
XorShift128Plus	sample	9167690	30,097	± 0,107	ns/op
Xoroshiro128Plus	sample	5165297	29,087	± 0,120	ns/op

Doubles

Algorithm	Mode	Cnt	Runtime	Error	Units
Jdk8SplitableRandom	sample	8222254	29,690	± 0,099	ns/op
JdkUtilRandom	sample	7255299	35,129	± 0,103	ns/op
SplitMix64	sample	8325463	28,796	± 0,075	ns/op
XorShift1024Star	sample	6270452	29,560	± 0,100	ns/op
XorShift128Plus	sample	8911743	29,951	± 0,068	ns/op
Xoroshiro128Plus	sample	8424508	29,546	± 0,070	ns/op

Results 2016

These are the results from my Laptop running Corei7 3630QM and Java 1.8 Update 20 64Bit.

Integers

Algorithm	Mode	Cnt	Runtime	Error ±	Units	Comparison
JdkUtilRandom	sample	2781465	33,445	1,380	ns/op	100%
Jdk8SplitableRandom	sample	2735057	21,972	0,213	ns/op	66%
SplitMix64	sample	2782019	21,304	0,232	ns/op	64%
XorShift1024*	sample	2475777	23,338	1,063	ns/op	70%
XorShift128+	sample	2761341	20,153	0,303	ns/op	60%
Xoroshiro128+	sample	2894680	19,389	0,244	ns/op	58%

Longs

Algorithm	Mode	Cnt	Runtime	Error ±	Units	Comparison
JdkUtilRandom	sample	3563424	50,835	0,510	ns/op	100%
Jdk8SplitableRandom	sample	2725138	22,241	0,223	ns/op	44%
SplitMix64	sample	2782328	21,196	0,220	ns/op	42%
XorShift1024*	sample	2446486	22,938	0,239	ns/op	45%
XorShift128+	sample	2822360	20,716	0,907	ns/op	41%
Xoroshiro128+	sample	2966685	19,464	0,404	ns/op	38%

Doubles

Algorithm	Mode	Cnt	Runtime	Error ±	Units	Comparison
JdkUtilRandom	sample	3564646	50,045	0,275	ns/op	100%
Jdk8SplitableRandom	sample	2468942	22,893	0,286	ns/op	46%
SplitMix64	sample	2519166	22,937	0,232	ns/op	46%
XorShift1024*	sample	2231386	24,464	1,038	ns/op	49%
XorShift128+	sample	2680414	22,292	0,260	ns/op	45%
Xoroshiro128+	sample	2802308	20,664	0,210	ns/op	41%

Contribution and License

This code is licensed under MIT.

Contributions are welcome.