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https://issues.apache.org/jira/browse/RNG-104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16868507#comment-16868507
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Gilles commented on RNG-104:
----------------------------
0.1 ns -> 15 ns
2^969 years -> 145,350 years (?)
> SeedFactory seed creation performance analysis
> ----------------------------------------------
>
> Key: RNG-104
> URL: https://issues.apache.org/jira/browse/RNG-104
> Project: Commons RNG
> Issue Type: Task
> Components: simple
> Affects Versions: 1.3
> Reporter: Alex D Herbert
> Assignee: Alex D Herbert
> Priority: Minor
> Attachments: t1.jpg, t4.jpg, well_lock_vs_sync1.png,
> well_lock_vs_sync4.jpg, well_sync_performance.jpg,
> well_unfair_performance.jpg, well_unfair_vs_fair.jpg, xor_unfair_int1.png,
> xor_unfair_long1.png
>
>
> The SeedFactory is used to create seeds for the random generators. To ensure
> thread safety this uses synchronized blocks around a single generator. The
> current method only generates a single int or long per synchronisation.
> Analyze the performance of this approach. The analysis will investigate
> generating multiple values inside each synchronisation around the generator.
> This analysis will also investigate methods to supplement the SeedFactory
> with fast methods to create seeds. This will use a fast seeding method to
> generate a single long value. This can be a seed for a SplitMix generator
> used to create a seed of any length.
>
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