anatoly@ci-server:~$ sudo jmap -heap `ps ax | grep -v '/usr/bin/daemon' | grep /usr/bin/java | grep jenkins | awk '{print $1}'`
Attaching to process ID 18124, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.65-b04

using thread-local object allocation.
Parallel GC with 2 thread(s)

Heap Configuration:
   MinHeapFreeRatio = 0
   MaxHeapFreeRatio = 100
   MaxHeapSize      = 1585446912 (1512.0MB)
   NewSize          = 1310720 (1.25MB)
   MaxNewSize       = 17592186044415 MB
   OldSize          = 5439488 (5.1875MB)
   NewRatio         = 2
   SurvivorRatio    = 8
   PermSize         = 21757952 (20.75MB)
   MaxPermSize      = 536870912 (512.0MB)
   G1HeapRegionSize = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 478150656 (456.0MB)
   used     = 474280752 (452.3093719482422MB)
   free     = 3869904 (3.6906280517578125MB)
   99.19065174303557% used
From Space:
   capacity = 12058624 (11.5MB)
   used     = 12045904 (11.487869262695312MB)
   free     = 12720 (0.0121307373046875MB)
   99.89451532778533% used
To Space:
   capacity = 25165824 (24.0MB)
   used     = 0 (0.0MB)
   free     = 25165824 (24.0MB)
   0.0% used
PS Old Generation
   capacity = 839909376 (801.0MB)
   used     = 495828296 (472.8587112426758MB)
   free     = 344081080 (328.1412887573242MB)
   59.03354697161995% used
PS Perm Generation
   capacity = 90177536 (86.0MB)
   used     = 81368704 (77.5992431640625MB)
   free     = 8808832 (8.4007568359375MB)
   90.23167809774709% used

34316 interned Strings occupying 3854632 bytes.