I've read the relevant source. While you're pedantically correct re the spec, you're wrong as to what the JVM actually does.
On Thu, May 26, 2011 at 3:14 PM, Jeffrey Kesselman <jef...@gmail.com> wrote: > Some references... > > "An object enters an unreachable state when no more strong references > to it exist. When an object is unreachable, it is a candidate for > collection. Note the wording: Just because an object is a candidate > for collection doesn't mean it will be immediately collected. The JVM > is free to delay collection until there is an immediate need for the > memory being consumed by the object." > > http://java.sun.com/docs/books/performance/1st_edition/html/JPAppGC.fm.html#998394 > > and "Calling the gc method suggests that the Java Virtual Machine > expend effort toward recycling unused objects" > > http://download.oracle.com/javase/6/docs/api/java/lang/System.html#gc() > > It goes on to say that the VM will make a "best effort", but "best > effort" is *deliberately* left up to the definition of the gc > implementor. > > I guess you missed the many lectures I have given on this subject over > the years at Java One Conferences.... > > On Thu, May 26, 2011 at 3:53 PM, Jonathan Ellis <jbel...@gmail.com> wrote: >> It's a common misunderstanding that system.gc is only a suggestion; on >> any VM you're likely to run Cassandra on, System.gc will actually >> invoke a full collection. >> >> On Thu, May 26, 2011 at 2:18 PM, Jeffrey Kesselman <jef...@gmail.com> wrote: >>> Actually this is no gaurantee. Its a common misunderstanding that >>> System.gc "forces" gc. It does not. It is a suggestion only. The vm always >>> has the option as to when and how much it gcs >>> >>> On May 26, 2011 2:51 PM, "Jonathan Ellis" <jbel...@gmail.com> wrote: >>> >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com >> > > > > -- > It's always darkest just before you are eaten by a grue. > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
