It mmaps the files into virtual memory if it runs on a 64 bit JVM. Because of that you see the mmapped CFS files. This is outside Java Heap and is all *virtual* no RAM is explicitely occupied except the O/S cache.
----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Chris Bamford [mailto:chris.bamf...@talktalk.net] > Sent: Tuesday, May 15, 2012 4:47 PM > To: java-user@lucene.apache.org > Subject: Memory question > > Hi > > Can anyone tell me what happens to the memory when Lucene opens an index? > Is it loaded into the JVM's heap or is it mapped into virtual memory outside of > it? > I am running on Linux and if I use pmap on the PID of my JVM, I can see lots of > entries for index cfs files. > > Does this mean that indexes are mapped into non-heap memory? If so, how > can I monitor the space my process is using if I cache open IndexSearchers? > > The details are: > > Sun 64-bit JVM on Linux. > Lucene 3.6 running in 2.3 compatibility mode (as we are in the in the process of > a migration to 3.6) > > Thanks, > > - Chris --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
