Java中的快速实值随机生成器 [英] Fast real valued random generator in java

问题描述

java.util.Random.nextDouble()对我来说很慢，我需要非常快的东西.

java.util.Random.nextDouble() is slow for me and I need something really fast.

我做了一些谷歌搜索，但我发现只有基于整数的快速随机生成器.区间< 0，1)中的实数在这里有用吗?

I did some google search and I've found only integers based fast random generators. Is here anything for real numbers from interval <0, 1) ?

推荐答案

如果您需要快速的东西并且可以访问Java8，我可以推荐java.utils

If you need something fast and have access to Java8, I can recommend the java.utils SplitableRandom. It is faster (~twice as fast) and has better statistical distribution.

如果您需要更快或更更好的算法，我可以推荐以下一种专门的XorShift变体:

If you need a even faster or better algorithm I can recommend one of these specialized XorShift variants:

• Xoroshiro128 + (更快更好) )
• XorShift1024 * (速度类似，甚至更长的时间)

• Xoroshiro128+ (faster & better)
• XorShift1024* (similar speed, even longer period)

有关这些算法及其质量的信息，可以在此PRNG比较中找到.

Information on these algorithms and their quality can be found in this big PRNG comparison.

我进行了独立的性能比较，您可以在此处找到详细的结果和代码: github.com/tobijdc/PRNG性能

I made an independent Performance comparison you can find the detailed results and the code here: github.com/tobijdc/PRNG-Performance

TLDR

请勿使用java.util.Random，请使用java.util.SplittableRandom. 如果您需要更快或更优质的PRNG，请使用XorShift变体.

Never use java.util.Random, use java.util.SplittableRandom. If you need faster or better PRNG use a XorShift variant.

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