why objects are propgated to old instead of aging in from space
I am seeing when eden is 100% and from space is 100% full before GC.
After GC from space is only 10-15% full but and most of the objects is propagated to old space rather then allowing aging to happen in newspace.
I have question about behavior which we seen today in on eour env.
We are in 1.4.2.09 jdk
Solaris 9
Apps server: weblogic
-Xms2560m -XX:+UseConcMarkSweepGC -XX:+UseP
arNewGC -XX:+CMSParallelRemarkEnabled -XX:+UseCMSCompactAtFullCollection -XX:CMSFullGCsBeforeCompaction=0 -Xmx2560m -XX:NewSize=640M -XX:MaxNewSize=640M -XX:MaxTenuringThreshold=6 -XX:SurvivorRatio=5 -XX:TargetS
urvivorRatio=80 -XX:MaxPermSize=256M
This is output from GC. My question is at the end for GC invocation 25072
386979.655: [GC {Heap before GC invocations=25070:
Heap
par new generationtotal 449408K, used 421988K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K, 100% used [0x49000000, 0x5fdc0000, 0x5fdc0000)
from space 74880K, 63% used [0x646e0000, 0x67539300, 0x69000000)
tospace 74880K,0% used [0x5fdc0000, 0x5fdc0000, 0x646e0000)
concurrent mark-sweep generation total 2097152K, used 958892K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94066K [0xe9000000, 0xf21e8000, 0xf9000000)
386979.656: [ParNew
Desired survivor size 61341696 bytes, new threshold 2 (max 5)
- age1:53505440 bytes,53505440 total
- age2:8843896 bytes,62349336 total
- age3:4630984 bytes,66980320 total
- age4:4953056 bytes,71933376 total
- age5:4592336 bytes,76525712 total
: 421988K->74880K(449408K), 0.4116928 secs] 1380881K->1047351K(2546560K) Heap after GC invocations=25071:
from space 74880K, 63% used [0x646e0000, 0x67539300, 0x69000000)
tospace 74880K,0% used [0x5fdc0000, 0x5fdc0000, 0x646e0000)
concurrent mark-sweep generation total 2097152K, used 958892K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94066K [0xe9000000, 0xf21e8000, 0xf9000000)
386979.656: [ParNew
Desired survivor size 61341696 bytes, new threshold 2 (max 5)
- age1:53505440 bytes,53505440 total
- age2:8843896 bytes,62349336 total
- age3:4630984 bytes,66980320 total
- age4:4953056 bytes,71933376 total
- age5:4592336 bytes,76525712 total
: 421988K->74880K(449408K), 0.4116928 secs] 1380881K->1047351K(2546560K) Heap after GC invocations=25071:
Heap
par new generationtotal 449408K, used 74880K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K,0% used [0x49000000, 0x49000000, 0x5fdc0000)
from space 74880K, 100% used [0x5fdc0000, 0x646e0000, 0x646e0000)
tospace 74880K,0% used [0x646e0000, 0x646e0000, 0x69000000)
concurrent mark-sweep generation total 2097152K, used 972471K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94066K [0xe9000000, 0xf21e8000, 0xf9000000)
} , 0.4122458 secs]
386982.508: [GC {Heap before GC invocations=25071:
Heap
par new generationtotal 449408K, used 348578K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K, 73% used [0x49000000, 0x59b488d8, 0x5fdc0000)
from space 74880K, 100% used [0x5fdc0000, 0x646e0000, 0x646e0000)
tospace 74880K,0% used [0x646e0000, 0x646e0000, 0x69000000)
concurrent mark-sweep generation total 2097152K, used 972471K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94067K [0xe9000000, 0xf21e8000, 0xf9000000)
386982.509: [ParNew
Desired survivor size 61341696 bytes, new threshold 1 (max 5)
- age1:74441024 bytes,74441024 total
- age2:2202704 bytes,76643728 total
: 348578K->74880K(449408K), 0.4058586 secs] 1321049K-1151354K(2546560K) Heap after GC invocations=25072:
Heap
par new generationtotal 449408K, used 74880K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K,0% used [0x49000000, 0x49000000, 0x5fdc0000)
from space 74880K, 100% used [0x646e0000, 0x69000000, 0x69000000)
tospace 74880K,0% used [0x5fdc0000, 0x5fdc0000, 0x646e0000)
concurrent mark-sweep generation total 2097152K, used 1076474K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94067K [0xe9000000, 0xf21e8000, 0xf9000000)
} , 0.4064259 secs]
386984.238: [GC {Heap before GC invocations=25072:
Heap
par new generationtotal 449408K, used 449408K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K, 100% used [0x49000000, 0x5fdc0000, 0x5fdc0000)
from space 74880K, 100% used [0x646e0000, 0x69000000, 0x69000000)
tospace 74880K,0% used [0x5fdc0000, 0x5fdc0000, 0x646e0000)
concurrent mark-sweep generation total 2097152K, used 1076474K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94067K [0xe9000000, 0xf21e8000, 0xf9000000)
386984.238: [ParNew
Desired survivor size 61341696 bytes, new threshold 5 (max 5)
- age1:6490896 bytes,6490896 total
: 449408K->6363K(449408K), 0.5403124 secs] 1525882K->1241212K(2546560K) Heap after GC invocations=25073:
Heap
par new generationtotal 449408K, used 6363K [0x49000000, 0x69000000, 0x69000000)
eden space 374528K,0% used [0x49000000, 0x49000000, 0x5fdc0000)
from space 74880K,8% used [0x5fdc0000, 0x603f6e60, 0x646e0000)
tospace 74880K,0% used [0x646e0000, 0x646e0000, 0x69000000)
concurrent mark-sweep generation total 2097152K, used 1234849K [0x69000000, 0xe9000000, 0xe9000000)
concurrent-mark-sweep perm gen total 149408K, used 94067K [0xe9000000, 0xf21e8000, 0xf9000000)
} , 0.5408648 secs]
Why at this time it propagated (1234849K ?1076474K = 158M)
Why it has n抰 gone to aging in from and to space.
Our survivor ratio = 5 and tenuringthreshold = 5
becasu eof thsi large propagation, till it hit CMS gc again, parnewGC takes 15-20 minutes
