I am responding on the StackOverflow thread. I will look into using ThreadLocalRandom.
The random.next() is clearly a potential bottleneck but given that this happens only once per HashMap instance it is still unclear why a reasonable application would want to create hundreds or thousands of hash maps per second. Mike On Dec 27 2012, at 11:38 , Aleksey Shipilev wrote: > Looks very like dumb inlined java.util.Random? > Is there a security threat to use ThreadLocalRandom instead there? > > -Aleksey. > > On 27.12.2012, at 23:16, Zhong Yu <zhong.j...@gmail.com> wrote: > >> Reported by the SO question >> >> http://stackoverflow.com/questions/14010906 >> >> the HashMap constructor contains a CAS, which is kind of surprising. >> Could it be removed? >> >> transient final int hashSeed = >> sun.misc.Hashing.randomHashSeed(this); // CAS >> >> Zhong Yu
