> From: Ohad Shacham <ohad.shac...@gmail.com> > To: dev@tomcat.apache.org > Sent: 08/11/09, 14:47:25 > Subject: ConcurrentHashMap > > Hi, > > > > I noticed that in version 6.0.20 several Hashtables and HashMaps were > replaced by ConcurrentHashMaps. I have noticed that many Hashtables were not > replaced; therefore, I assume that a contention detection tool was used to > identify the contended Hashtables. Not to my knowledge.
> I would be happy to know if this is the > case and also whether a scalability and/or performance improvement was > achieved by switching these collections with concurrent ones. Based on general experience I'd say yes, mainly for multi-core machines. In specific cases I don't recall any measurements or results. The corresponding comit messages should be the best source of information for individual changes. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org
