[isabelle-dev] Non-responding Isabelle/jEdit and Monitor panel

[Makarius]

On Wed, 11 Nov 2015, Fabian Immler wrote:

> I observed (in at least a99125aa964f) that when Isabelle/jEdit has been 
> running for some time (about 2 to 4 hours perhaps), the GUI starts to 
> "hang": every 3-4 seconds, the GUI does not respond to inputs for about 
> half a second. I realized that this is apparently related to the Monitor 
> panel: clicking "Reset" there resolves the problem.

The "jedit" manual section 5.1 has some hints about considerable resource 
requirements of Monitor, but it is not very specific.

There is this general principle, that a jEdit dockable remains active 
after being opened once.  Monitor also has an "ML statistics" checkbox, 
which is a clone of the one in Plugin Options / Isabelle / General.  The 
default of that could be changed to "false", but it is unclear if this 
helps: after enabling it for actual use of Monitor, it remains enabled 
persistently.


There might be actually a different problem behind all this: when the JVM 
heaps fills up gradually, it can get in a very bad situation.  My 
impression is that Java 8 is worse than Java 7, but I don't have any 
proofs for it.  It might be also a matter how Java 8 heap parameters are 
set.


 	Makarius