The test LoadUnloadGC tries to create a lot of classes to stress ClassLoading. I found that on sparc with 128 threads it creates a lot of classes and eat all PermGen. It provokes a lot of GC and OOME. In that time VM tries to increase OldGen which is really not used. So java process grows unexpectedly. VM should not try to increase OldGen if it is not really occupied.

You could use script from HS20 PIT
http://sqeweb.sfbay/nfs/results/vm/gtee/HSX/PIT/VM/hs20/07/jdk6u25b01/product/vm/solaris-sparcv9/server/comp/solaris-sparcv9_vm__server_comp_vm.gc.testlist/ResultDir/LoadUnloadGC/rerun.sh
Reproduce on vm-t5440-01b (or add "-t 128" to STRESS_OPTIONS in script rerun.sh)


The gc log is:
[Full GC [PSYoungGen: 2663K->0K(397184K)] [PSOldGen: 0K->2237K(232640K)] 2663K->2237K(629824K) [PSPermGen: 81920K->81920K(81920K)], 13.4065787 se
cs] [Times: user=13.13 sys=0.30, real=13.41 secs]
[Full GC [PSYoungGen: 0K->0K(397312K)] [PSOldGen: 2237K->2220K(455168K)] 2237K->2220K(852480K) [PSPermGen: 81920K->81910K(81920K)], 14.9528053 se
cs] [Times: user=14.54 sys=0.44, real=14.95 secs]
[Full GC [PSYoungGen: 352K->0K(405248K)] [PSOldGen: 2220K->2221K(719552K)] 2572K->2221K(1124800K) [PSPermGen: 81919K->81919K(81920K)], 14.2861947
 secs] [Times: user=13.83 sys=0.48, real=14.29 secs]
[Full GC [PSYoungGen: 0K->0K(411456K)] [PSOldGen: 2221K->2152K(1140416K)] 2221K->2152K(1551872K) [PSPermGen: 81919K->81919K(81920K)], 15.2377049
secs] [Times: user=14.54 sys=0.72, real=15.24 secs]
[Full GC [PSYoungGen: 96K->0K(416832K)] [PSOldGen: 2152K->2152K(1586944K)] 2248K->2152K(2003776K) [PSPermGen: 81919K->81919K(81920K)], 15.6922192
 secs] [Times: user=14.89 sys=0.83, real=15.69 secs]
[Full GC [PSYoungGen: 0K->0K(425664K)] [PSOldGen: 2152K->2151K(2209728K)] 2152K->2151K(2635392K) [PSPermGen: 81919K->81919K(81920K)], 16.8446784
secs] [Times: user=15.77 sys=1.11, real=16.85 secs]
[Full GC [PSYoungGen: 0K->0K(425856K)] [PSOldGen: 2151K->2151K(2861120K)] 2151K->2151K(3286976K) [PSPermGen: 81919K->81919K(81920K)], 16.5312772
secs] [Times: user=15.43 sys=1.14, real=16.53 secs]
[Full GC [PSYoungGen: 0K->0K(433920K)] [PSOldGen: 2151K->2151K(3705408K)] 2151K->2151K(4139328K) [PSPermGen: 81919K->81919K(81920K)], 18.2341781
secs] [Times: user=16.77 sys=1.46, real=18.24 secs]
[Full GC [PSYoungGen: 128K->0K(433408K)] [PSOldGen: 2151K->2152K(4617216K)] 2279K->2152K(5050624K) [PSPermGen: 81919K->81919K(81920K)], 18.158561
4 secs] [Times: user=16.57 sys=1.63, real=18.16 secs]
[Full GC [PSYoungGen: 0K->0K(440896K)] [PSOldGen: 2152K->2145K(5754432K)] 2152K->2145K(6195328K) [PSPermGen: 81919K->81919K(81920K)], 18.8078592
secs] [Times: user=16.81 sys=2.03, real=18.81 secs]
[Full GC [PSYoungGen: 64K->0K(440512K)] [PSOldGen: 2145K->2145K(7002304K)] 2209K->2145K(7442816K) [PSPermGen: 81919K->81919K(81920K)], 20.3416564
 secs] [Times: user=17.96 sys=2.28, real=20.34 secs]
[Full GC [PSYoungGen: 0K->0K(446272K)] [PSOldGen: 2145K->2145K(8388608K)] 2145K->2145K(8834880K) [PSPermGen: 81919K->81919K(81920K)], 19.9769086
secs] [Times: user=17.50 sys=2.51, real=19.98 secs]
[Full GC [PSYoungGen: 96K->0K(445376K)] [PSOldGen: 2145K->2145K(8388608K)] 2241K->2145K(8833984K) [PSPermGen: 81919K->81919K(81920K)], 12.4502239
 secs] [Times: user=12.46 sys=0.02, real=12.45 secs]
[Full GC [PSYoungGen: 0K->0K(451008K)] [PSOldGen: 2145K->2145K(8388608K)] 2145K->2145K(8839616K) [PSPermGen: 81919K->81919K(81920K)], 13.4910154
secs] [Times: user=13.50 sys=0.02, real=13.49 secs]
[Full GC [PSYoungGen: 64K->0K(450496K)] [PSOldGen: 2145K->2146K(8388608K)] 2209K->2146K(8839104K) [PSPermGen: 81919K->81919K(81920K)], 12.6032872
 secs] [Times: user=12.54 sys=0.01, real=12.60 secs]
[Full GC [PSYoungGen: 0K->0K(455552K)] [PSOldGen: 2146K->2145K(8388608K)] 2146K->2145K(8844160K) [PSPermGen: 81919K->81919K(81920K)], 12.5532546