Can a full codecache trigger CMS? (was: Erratic(?) CMS behaviour every 5d)

[Bernd Eckenfels]

Hello,

my problem continues, this time after 7d the erratic behaviour started.  
This time I was very closely monitoring the system, and the PermGen seems  
not to be the cause:

Pool: CMS Perm Gen (Non-heap memory)
Peak Usage : init:104857600, used:279972328, committed:314572800,  
max:314572800
Current Usage : init:104857600, used:216017192, committed:314572800,  
max:314572800

What I do see however is, that the code cache slowly approaches the  
maximum, could that trigger repeating CMS intervalls?

Pool: Code Cache (Non-heap memory)
Peak Usage : init:2555904, used:49850048, committed:50266112, max:50331648
Current Usage : init:2555904, used:49850048, committed:50266112,  
max:50331648

This time I will restart the system with OccupancyOnly setting (to 10%). I  
also increase the CodeCache and enable swweping in it. The PermGen will  
also be 1G max, just to be sure.

Here is the current log with CMSStatiscs=2 (which does not help I think).
https://mft.seeburger.de/portal-seefx/~public/52caa5cc-dfb6-41db-a096-d4f4eb6aba1b?download


Here is the rest of the memory pools, not that oldgen is at 5%, so  
unlikely cause for concurrent mode failures.

Memory Information
Total Memory Pools: 5


Pool: Par Eden Space (Heap memory)
Peak Usage : init:13743947776, used:13743947776, committed:13743947776,  
max:13743947776
Current Usage : init:13743947776, used:723224384, committed:13743947776,  
max:13743947776

Pool: Par Survivor Space (Heap memory)
Peak Usage : init:1717960704, used:1693771776, committed:1717960704,  
max:1717960704
Current Usage : init:1717960704, used:227068920, committed:1717960704,  
max:1717960704

Pool: CMS Old Gen (Heap memory)
Peak Usage : init:34359738368, used:3018247512, committed:34359738368,  
max:34359738368
Current Usage : init:34359738368, used:1787484240, committed:34359738368,  
max:34359738368

Greetings
Bernd