[infinispan-dev] ClockService

Thinking about Sanne's idea re: a clock service and not continuously relying on System.cTM, I stumbled upon this: https://blogs.oracle.com/ksrini/entry/we_take_java_performance_very The last section re: caching is interesting. Having all code use a Clock.currentTimeMillis() and having an implementation that kicks off a scheduled task to update a cached value every $frequency millis (by using the System call) is probably the correct way to implement something like this, but this adds complexities/concerns: * CPU cache line blowing away (see article) * Context switching * Managing an extra service thread * Probably an additional configuration option to configure that thread, its priority and frequency. If frequency is dropped (e.g., every second) I suppose the perf gains would be huge. JGroups - does JGroups make many and frequent calls to System.cTM as well? Cheers Manik -- Manik Surtani manik(a)jboss.org twitter.com/maniksurtani Platform Architect, JBoss Data Grid http://red.ht/data-grid