Hello there! Using jstat with -gc flag to analyze our server's health indicates that we are using aroung 1GB of Old Space. But after dumping the heap using jmap. And using a tool (Eclipse Memory Analyzer Tool and Yourkit) both indicates that the heap has only 223mb.
Is this a normal behaviour?
When you say "using around 1Gb of Old Space", what do you mean? The size of the space is 1Gb or the amount of the data in it is 1Gb?
I recommend jvisualvm with the Visual GC plugin installed for analysing heap space.