Created
January 15, 2012 07:52
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example of DirectByteBuffer instances that die in young gen get processed by ParNew GC
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D:\experiment>set JAVA_OPTS=-Xmx64m -Xms64m -Xmn20m -XX:+UseConcMarkSweepGC -XX:+PrintGCDetails | |
D:\experiment>groovysh | |
[GC [ParNew: 16384K->2048K(18432K), 0.0169505 secs] 16384K->2114K(63488K), 0.0179312 secs] [Times: u | |
ser=0.05 sys=0.00, real=0.02 secs] | |
Groovy Shell (1.8.4, JVM: 1.6.0_30) | |
Type 'help' or '\h' for help. | |
--------------------------------------------------------------------------------------------------- | |
[GC [ParNew: 18432K->2048K(18432K), 0.0720667 secs] 18498K->7179K(63488K), 0.0727480 secs] [Times: u | |
ser=0.19 sys=0.00, real=0.07 secs] | |
groovy:000> java.nio.Bits.reservedMemory | |
===> 0 | |
groovy:000> java.nio.ByteBuffer.allocateDirect(8) | |
===> java.nio.DirectByteBuffer[pos=0 lim=8 cap=8] | |
groovy:000> java.nio.Bits.reservedMemory | |
===> 8 | |
groovy:000> 100000.times { [:] } | |
[GC [ParNew: 18432K->2048K(18432K), 0.0941397 secs] 23563K->10591K(63488K), 0.0948446 secs] [Times: | |
user=0.09 sys=0.00, real=0.09 secs] | |
[GC [ParNew: 18432K->1971K(18432K), 0.0174726 secs] 26975K->12535K(63488K), 0.0180691 secs] [Times: | |
user=0.05 sys=0.00, real=0.02 secs] | |
===> null | |
groovy:000> java.nio.Bits.reservedMemory | |
===> 0 | |
groovy:000> quit | |
Heap | |
par new generation total 18432K, used 6755K [0x00000000f6e00000, 0x00000000f8200000, 0x00000000f8 | |
200000) | |
eden space 16384K, 29% used [0x00000000f6e00000, 0x00000000f72ac040, 0x00000000f7e00000) | |
from space 2048K, 96% used [0x00000000f7e00000, 0x00000000f7fece00, 0x00000000f8000000) | |
to space 2048K, 0% used [0x00000000f8000000, 0x00000000f8000000, 0x00000000f8200000) | |
concurrent mark-sweep generation total 45056K, used 10564K [0x00000000f8200000, 0x00000000fae00000, | |
0x00000000fae00000) | |
concurrent-mark-sweep perm gen total 21248K, used 17186K [0x00000000fae00000, 0x00000000fc2c0000, 0 | |
x0000000100000000) | |
D:\experiment> |
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