Advance notice of an imminent Full GC

[Mandy Chung]

This article also talks about the low memory detection:
  
http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html#LowMemoryDetection

Mandy

Jon Masamitsu wrote:
> Denis Baranov wrote:
>
>   
>> Hi!
>>
>> I was told at the JavaOne booth that it may be possible to expose
>> HotSpot's inner workings to the degree that when HotSpot makes the
>> decision to collect or not, those values it bases its decision upon
>> can be exposed via JMX and some application may be notified when
>> certain threshold is crossed. I think this would be helpful (in
>> absence of RealTime JVM) to be able to notify load balancer in
>> load-balanced configuration to stop sending requests to this instance,
>> force GC or wait for it to occur naturally, and then notify load
>> balancer again that the instance is ready to process requests.
>> Otherwise we observe situation when requests pile up at the "gate" and
>> cause an abrupt spike in load after Full GC.
>>
>> Thanks!
>>  
>>
>>     
> Take a look at
>
> http://java.sun.com/j2se/1.5.0/docs/guide/management/mxbeans.html#low_memory
>
> There is a section that talks about detecting low memory which
> might be of interest.  That page has links that might also be
> useful. This is the jdk5 documentation. 
>
> The jdk6 monitoring guide will be more current but I don't think it
> is linked to other interesting stuff.
>
> http://java.sun.com/javase/6/docs/technotes/guides/management/MonitoringGuide.pdf
> <http://onesearch.sun.com/search/clickthru?qt=low+memory+detection&url=http%3A%2F%2Fjava.sun.com%2Fjavase%2F6%2Fdocs%2Ftechnotes%2Fguides%2Fmanagement%2FMonitoringGuide.pdf&pathInfo=%2Fsearch%2Fonesearch%2Findex.jsp&hitNum=3&col=developer-reference>
>
>