Full GC loop

Our application went into Full GC loop, we did have verbose GC turned on. Can someone please explain how this can be interpretted.
It appears like there is close to 1G free for promotion and still the Young Gen promotion is not working.
Line 88326 : 41900.684: [GC [PSYoungGen: 1866224K->43794K(1931840K)] 3502757K->1685045K(5446976K), 0.1167970 secs] [Times: user=0.12 sys=0.00, real=0.12 secs]
Line 88327 : 41906.230: [GC [PSYoungGen: 1868882K->64245K(1941056K)] 3510133K->1705697K(5456192K), 0.1538270 secs] [Times: user=0.15 sys=0.00, real=0.15 secs]
Line 88328 : 41913.490: [GC [PSYoungGen: 1903285K->15842K(1941440K)] 3544737K->1685685K(5456576K), 0.1050850 secs] [Times: user=0.10 sys=0.00, real=0.11 secs]
Line 88329 : 41919.636: [GC [PSYoungGen: 1854882K->71593K(1938112K)] 3524725K->1743162K(5453248K), 0.1610370 secs] [Times: user=0.16 sys=0.00, real=0.16 secs]
Line 88330 : 41926.003: [GC [PSYoungGen: 1906473K->44674K(1879616K)] 3578042K->1716607K(5394752K), 0.0935700 secs] [Times: user=0.11 sys=0.00, real=0.10 secs]
Line 88331 : 41931.256: [GC [PSYoungGen: 1879554K->19205K(1940032K)] 3551487K->1720689K(5455168K), 0.0924580 secs] [Times: user=0.13 sys=0.00, real=0.09 secs]
Line 88332 : 41935.287: [GC [PSYoungGen: 1857477K->41100K(1939968K)] 3558961K->1742584K(5455104K), 0.0953660 secs] [Times: user=0.14 sys=0.00, real=0.09 secs]
Line 88333 : 41938.270: [GC [PSYoungGen: 1879372K->18301K(1942016K)] 3580856K->1719871K(5457152K), 0.1102160 secs] [Times: user=0.09 sys=0.00, real=0.11 secs]
Line 88334 : 41941.788: [GC [PSYoungGen: 1863293K->79254K(1941568K)] 3564863K->1781043K(5456704K), 0.0817900 secs] [Times: user=0.24 sys=0.00, real=0.08 secs]
Line 88335 : 41946.594: [GC [PSYoungGen: 1924246K->69389K(1938112K)] 3626035K->1771986K(5453248K), 0.1661760 secs] [Times: user=0.20 sys=0.00, real=0.16 secs]
Line 88336 : 41951.120: [GC [PSYoungGen: 1902861K->38451K(1871936K)] 3605458K->1770219K(5387072K), 0.1473680 secs] [Times: user=0.18 sys=0.00, real=0.15 secs]
Line 88337 : 41958.626: [GC [PSYoungGen: 1871923K->54656K(1942400K)] 3603691K->1788149K(5457536K), 0.1552370 secs] [Times: user=0.16 sys=0.00, real=0.15 secs]
Line 88338 : 41966.122: [GC [PSYoungGen: 1893824K->76469K(1939328K)] 4634025K->2853942K(5454464K), 0.1254980 secs] [Times: user=0.22 sys=0.00, real=0.13 secs]
Line 88339 : 41967.458: [GC [PSYoungGen: 1358774K->17127K(1941760K)] 4136247K->3836163K(6037760K), 1.0412470 secs] [Times: user=0.80 sys=0.34, real=1.04 secs]
Line 88340 : 41968.499: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1047]
Line 88471 : 41975.139: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4982380K->4982380K(6037760K), 0.0646720 secs] [Times: user=0.06 sys=0.01, real=0.06 secs]
Line 88472 : 41975.204: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1202]
Line 88543 : 41979.042: [GC-- [PSYoungGen: 1837491K->1837491K(1941760K)] 4983455K->4983455K(6037760K), 0.3140620 secs] [Times: user=0.63 sys=0.00, real=0.32 secs]
Line 88544 : 41979.356: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor671]
Line 88560 : 41985.093: [GC-- [PSYoungGen: 1830269K->1830269K(1941760K)] 4795149K->4795149K(6037760K), 0.3286810 secs] [Times: user=0.63 sys=0.00, real=0.33 secs]
Line 88561 : 41985.422: [Full GC [PSYoungGen: 1830269K->1831614K(1941760K)] [PSOldGen: 2964879K->2964879K(4096000K)] 4795149K->4796494K(6037760K) [PSPermGen: 123099K->123099K(126656K)], 3.1776690 secs] [Times: user=3.17 sys=0.01, real=3.18 secs]
Line 88562 : 41988.810: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4901950K->4901950K(6037760K), 0.2989710 secs] [Times: user=0.63 sys=0.00, real=0.30 secs]
Line 88563 : 41989.109: [Full GC [PSYoungGen: 1836416K->1837766K(1941760K)] [PSOldGen: 3065534K->3065534K(4096000K)] 4901950K->4903301K(6037760K) [PSPermGen: 123099K->123099K(126528K)], 3.1866390 secs] [Times: user=3.17 sys=0.00, real=3.19 secs]
Line 88564 : 41992.341: [GC-- [PSYoungGen: 1837766K->1837766K(1941760K)] 4903301K->4903301K(6037760K), 0.3023900 secs] [Times: user=0.63 sys=0.00, real=0.30 secs]
Line 88565 : 41992.643: [Full GC [PSYoungGen: 1837766K->1837766K(1941760K)] [PSOldGen: 3065534K->3065534K(4096000K)] 4903301K->4903301K(6037760K) [PSPermGen: 123099K->123099K(125952K)], 3.1959920 secs] [Times: user=3.17 sys=0.01, real=3.20 secs]
Line 88566 : 41995.849: [GC-- [PSYoungGen: 1837766K->1837766K(1941760K)] 4903301K->4903309K(6037760K), 0.3198970 secs] [Times: user=0.63 sys=0.00, real=0.32 secs]
Line 88567 : 41996.169: [Full GC [PSYoungGen: 1837766K->1813137K(1941760K)] [PSOldGen: 3065542K->3062041K(4096000K)] 4903309K->4875179K(6037760K) [PSPermGen: 123099K->123099K(125888K)], 5.4472620 secs] [Times: user=5.44 sys=0.00, real=5.45 secs]
Line 88568 : 42001.746: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4898457K->4898457K(6037760K), 0.2801550 secs] [Times: user=0.65 sys=0.00, real=0.28 secs]
Line 88569 : 42002.026: [Full GC [PSYoungGen: 1836416K->1837744K(1941760K)] [PSOldGen: 3062041K->3062041K(4096000K)] 4898457K->4899786K(6037760K) [PSPermGen: 123099K->123099K(125824K)], 3.2083830 secs] [Times: user=3.20 sys=0.01, real=3.21 secs]
Line 88570 : 42005.266: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899786K->4899786K(6037760K), 0.2898370 secs] [Times: user=0.59 sys=0.00, real=0.29 secs]
Line 88571 : 42005.556: [Full GC [PSYoungGen: 1837744K->1837744K(1941760K)] [PSOldGen: 3062041K->3062041K(4096000K)] 4899786K->4899786K(6037760K) [PSPermGen: 123099K->123099K(125312K)], 3.2037720 secs] [Times: user=3.20 sys=0.01, real=3.20 secs]
Line 88572 : 42008.805: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899786K->4899794K(6037760K), 0.3347480 secs] [Times: user=0.59 sys=0.00, real=0.33 secs]
Line 88573 : 42009.140: [Full GC [PSYoungGen: 1837744K->1837744K(1941760K)] [PSOldGen: 3062049K->3062049K(4096000K)] 4899794K->4899794K(6037760K) [PSPermGen: 123099K->123099K(125312K)], 3.1690990 secs] [Times: user=3.16 sys=0.00, real=3.17 secs]
Line 88574 : 42012.319: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899794K->4899794K(6037760K), 0.3056590 secs] [Times: user=0.62 sys=0.00, real=0.31 secs]
Line 88575 : 42012.625: [Full GC [PSYoungGen: 1837744K->1813115K(1941760K)] [PSOldGen: 3062049K->3060814K(4096000K)] 4899794K->4873929K(6037760K) [PSPermGen: 123099K->123099K(124800K)], 4.9230010 secs] [Times: user=4.92 sys=0.01, real=4.92 secs]
Line 88576 : 42017.661: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4897230K->4897230K(6037760K), 0.2799600 secs] [Times: user=0.66 sys=0.00, real=0.28 secs]
The following JVM options were used
-Xms512M -XX:MaxPermSize=260M -Xmx6000M

Hy,
I'll have a stab at this :)
up until "Line 88338", there's no sign of anything wrong with memory allocation in the JVM ... but
Line 88337 : 41958.626: [GC [PSYoungGen: 1871923K->54656K(1942400K)] 3603691K->1788149K(5457536K), 0.1552370 secs] [Times: user=0.16 sys=0.00, real=0.15 secs]
Line 88338 : 41966.122: [GC [PSYoungGen: 1893824K->76469K(1939328K)] 4634025K->2853942K(5454464K), 0.1254980 secs] [Times: user=0.22 sys=0.00, real=0.13 secs]
than on "Line 88339" a few things to notice : GC kicks in only 1sec. after previous one and only "300084K" OldGen got freed up as opposed to 1800000K befor. Eden is not the probem here; possibly survivor space ... but need more info on application
Line 88339 : 41967.458: [GC [PSYoungGen: 1358774K->17127K(1941760K)] 4136247K->3836163K(6037760K), 1.0412470 secs] [Times: user=0.80 sys=0.34, real=1.04 secs]
Line 88340 : 41968.499: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1047]
Unloading classes can point to PermSpace depletion, but your GC logging is not verbose enough to see permspace collections all the time..
After this, even if PermSpace got freed up enough, it seems your application doesn't recover at all ... probably only a restart works(around) ?
Line 88471 : 41975.139: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4982380K->4982380K(6037760K), 0.0646720 secs] [Times: user=0.06 sys=0.01, real=0.06 secs]
Line 88472 : 41975.204: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1202]
Line 88543 : 41979.042: [GC-- [PSYoungGen: 1837491K->1837491K(1941760K)] 4983455K->4983455K(6037760K), 0.3140620 secs] [Times: user=0.63 sys=0.00, real=0.32 secs]
Line 88544 : 41979.356: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor671]
Line 88560 : 41985.093: [GC-- [PSYoungGen: 1830269K->1830269K(1941760K)] 4795149K->4795149K(6037760K), 0.3286810 secs] [Times: user=0.63 sys=0.00, real=0.33 secs]
Line 88561 : 41985.422: [Full GC [PSYoungGen: 1830269K->1831614K(1941760K)] [PSOldGen: 2964879K->2964879K(4096000K)] 4795149K->4796494K(6037760K) [PSPermGen: 123099K->123099K(126656K)], 3.1776690 secs] [Times: user=3.17 sys=0.01, real=3.18 secs]
If you really need 6GB for this app, and you have the resources, try moving Xms and Xmx closer together; rescale (initial + max) PermSize as well .. and than report back. Is it background app or user interactive. I presume you're using jdk1.5 ?
e.g. "-verbose:gc -XX:+PrintGCDetails -Xms4000m -Xmx6000m -XX:MaxPermSize=500m" possibly try adding "-XX:SurvivorRatio=8" or so, this could releive collector a bit of promoting too much to OldGen ...
grtz,
gert

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Full GC loops - JDK1.4.1

Hi,
we are using JDK1.4.1_01 with Tomcat 4.1.18 for a banking application with 20.000 hits per day and 2000 users (Win 2000, 4 GB, 2 2000 MHZ CPU).
After 8 hours runtime and only some full gcs occuring (and a lot more minor gcs) Tomcat dies with OutOfMemory exceptions.
In the verbose:gc output you can see that the vm hangs in a full gc loop without reducing the heap and although there is only 100M of 1500M heap used.
The systems can't respond due to the fact one full gc is starting after the one that has just finished.
At this stage we have no idea why. Only restarting Tomcat helps and ensures us another 8 hours online time.
The vm parameters are the following:
-XX:+PrintHeapAtGC -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:NewRatio=3 -Xms1536M -Xmx1536M -XX:-DisableExplicitGC -Xloggc:logs\tomcat-gc-collections.txt -Dcatalina.base="d:\apps\tomcat" -Dcatalina.home="d:\apps\tomcat" -Djava.io.tmpdir=d:\apps\tmp -Dhostmode=avus -Dlog4j.configuration=log4J.properties -Djava.naming.factory.initial=com.inprise.j2ee.jndi.CtxFactory -Djava.naming.factory.url.pkgs=com.inprise.j2ee.jndi -Dvbroker.agent.port=14449
The catalina.log states the following:
003-06-23 16:31:49 HttpProcessor[80][36] process.invoke
java.lang.OutOfMemoryError
2003-06-23 16:31:49 HttpProcessor[80][25] process.invoke
java.lang.OutOfMemoryError
Thanks for any help
Oliver

is it just me or did you disable explicit garbage collection meaning that calls to System.gc() are ignored ...
personally I think it is probably better to force calls when they are needed (i.e. when you're placing a lot of young objects into the heap)
However as to why full gc isn't reducing the free memory - sound buggy to me.

Full GC Loop + How to interpret Verbose GC?

Can someone please explain how this verbose gc can be interpretted?
It appears like there is close to 1G free for promotion and still the Young Gen promotion is not happening. Is this normal ?
The application goes into Full GC loops and eventually has to be restarted to be performant again.
Line 88326 : 41900.684: [GC [PSYoungGen: 1866224K->43794K(1931840K)] 3502757K->1685045K(5446976K), 0.1167970 secs] [Times: user=0.12 sys=0.00, real=0.12 secs]
Line 88327 : 41906.230: [GC [PSYoungGen: 1868882K->64245K(1941056K)] 3510133K->1705697K(5456192K), 0.1538270 secs] [Times: user=0.15 sys=0.00, real=0.15 secs]
Line 88328 : 41913.490: [GC [PSYoungGen: 1903285K->15842K(1941440K)] 3544737K->1685685K(5456576K), 0.1050850 secs] [Times: user=0.10 sys=0.00, real=0.11 secs]
Line 88329 : 41919.636: [GC [PSYoungGen: 1854882K->71593K(1938112K)] 3524725K->1743162K(5453248K), 0.1610370 secs] [Times: user=0.16 sys=0.00, real=0.16 secs]
Line 88330 : 41926.003: [GC [PSYoungGen: 1906473K->44674K(1879616K)] 3578042K->1716607K(5394752K), 0.0935700 secs] [Times: user=0.11 sys=0.00, real=0.10 secs]
Line 88331 : 41931.256: [GC [PSYoungGen: 1879554K->19205K(1940032K)] 3551487K->1720689K(5455168K), 0.0924580 secs] [Times: user=0.13 sys=0.00, real=0.09 secs]
Line 88332 : 41935.287: [GC [PSYoungGen: 1857477K->41100K(1939968K)] 3558961K->1742584K(5455104K), 0.0953660 secs] [Times: user=0.14 sys=0.00, real=0.09 secs]
Line 88333 : 41938.270: [GC [PSYoungGen: 1879372K->18301K(1942016K)] 3580856K->1719871K(5457152K), 0.1102160 secs] [Times: user=0.09 sys=0.00, real=0.11 secs]
Line 88334 : 41941.788: [GC [PSYoungGen: 1863293K->79254K(1941568K)] 3564863K->1781043K(5456704K), 0.0817900 secs] [Times: user=0.24 sys=0.00, real=0.08 secs]
Line 88335 : 41946.594: [GC [PSYoungGen: 1924246K->69389K(1938112K)] 3626035K->1771986K(5453248K), 0.1661760 secs] [Times: user=0.20 sys=0.00, real=0.16 secs]
Line 88336 : 41951.120: [GC [PSYoungGen: 1902861K->38451K(1871936K)] 3605458K->1770219K(5387072K), 0.1473680 secs] [Times: user=0.18 sys=0.00, real=0.15 secs]
Line 88337 : 41958.626: [GC [PSYoungGen: 1871923K->54656K(1942400K)] 3603691K->1788149K(5457536K), 0.1552370 secs] [Times: user=0.16 sys=0.00, real=0.15 secs]
Line 88338 : 41966.122: [GC [PSYoungGen: 1893824K->76469K(1939328K)] 4634025K->2853942K(5454464K), 0.1254980 secs] [Times: user=0.22 sys=0.00, real=0.13 secs]
Line 88339 : 41967.458: [GC [PSYoungGen: 1358774K->17127K(1941760K)] 4136247K->3836163K(6037760K), 1.0412470 secs] [Times: user=0.80 sys=0.34, real=1.04 secs]
Line 88340 : 41968.499: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1047]
Line 88471 : 41975.139: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4982380K->4982380K(6037760K), 0.0646720 secs] [Times: user=0.06 sys=0.01, real=0.06 secs]
Line 88472 : 41975.204: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor1202]
Line 88543 : 41979.042: [GC-- [PSYoungGen: 1837491K->1837491K(1941760K)] 4983455K->4983455K(6037760K), 0.3140620 secs] [Times: user=0.63 sys=0.00, real=0.32 secs]
Line 88544 : 41979.356: [Full GC[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor671]
Line 88560 : 41985.093: [GC-- [PSYoungGen: 1830269K->1830269K(1941760K)] 4795149K->4795149K(6037760K), 0.3286810 secs] [Times: user=0.63 sys=0.00, real=0.33 secs]
Line 88561 : 41985.422: [Full GC [PSYoungGen: 1830269K->1831614K(1941760K)] [PSOldGen: 2964879K->2964879K(4096000K)] 4795149K->4796494K(6037760K) [PSPermGen: 123099K->123099K(126656K)], 3.1776690 secs] [Times: user=3.17 sys=0.01, real=3.18 secs]
Line 88562 : 41988.810: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4901950K->4901950K(6037760K), 0.2989710 secs] [Times: user=0.63 sys=0.00, real=0.30 secs]
Line 88563 : 41989.109: [Full GC [PSYoungGen: 1836416K->1837766K(1941760K)] [PSOldGen: 3065534K->3065534K(4096000K)] 4901950K->4903301K(6037760K) [PSPermGen: 123099K->123099K(126528K)], 3.1866390 secs] [Times: user=3.17 sys=0.00, real=3.19 secs]
Line 88564 : 41992.341: [GC-- [PSYoungGen: 1837766K->1837766K(1941760K)] 4903301K->4903301K(6037760K), 0.3023900 secs] [Times: user=0.63 sys=0.00, real=0.30 secs]
Line 88565 : 41992.643: [Full GC [PSYoungGen: 1837766K->1837766K(1941760K)] [PSOldGen: 3065534K->3065534K(4096000K)] 4903301K->4903301K(6037760K) [PSPermGen: 123099K->123099K(125952K)], 3.1959920 secs] [Times: user=3.17 sys=0.01, real=3.20 secs]
Line 88566 : 41995.849: [GC-- [PSYoungGen: 1837766K->1837766K(1941760K)] 4903301K->4903309K(6037760K), 0.3198970 secs] [Times: user=0.63 sys=0.00, real=0.32 secs]
Line 88567 : 41996.169: [Full GC [PSYoungGen: 1837766K->1813137K(1941760K)] [PSOldGen: 3065542K->3062041K(4096000K)] 4903309K->4875179K(6037760K) [PSPermGen: 123099K->123099K(125888K)], 5.4472620 secs] [Times: user=5.44 sys=0.00, real=5.45 secs]
Line 88568 : 42001.746: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4898457K->4898457K(6037760K), 0.2801550 secs] [Times: user=0.65 sys=0.00, real=0.28 secs]
Line 88569 : 42002.026: [Full GC [PSYoungGen: 1836416K->1837744K(1941760K)] [PSOldGen: 3062041K->3062041K(4096000K)] 4898457K->4899786K(6037760K) [PSPermGen: 123099K->123099K(125824K)], 3.2083830 secs] [Times: user=3.20 sys=0.01, real=3.21 secs]
Line 88570 : 42005.266: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899786K->4899786K(6037760K), 0.2898370 secs] [Times: user=0.59 sys=0.00, real=0.29 secs]
Line 88571 : 42005.556: [Full GC [PSYoungGen: 1837744K->1837744K(1941760K)] [PSOldGen: 3062041K->3062041K(4096000K)] 4899786K->4899786K(6037760K) [PSPermGen: 123099K->123099K(125312K)], 3.2037720 secs] [Times: user=3.20 sys=0.01, real=3.20 secs]
Line 88572 : 42008.805: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899786K->4899794K(6037760K), 0.3347480 secs] [Times: user=0.59 sys=0.00, real=0.33 secs]
Line 88573 : 42009.140: [Full GC [PSYoungGen: 1837744K->1837744K(1941760K)] [PSOldGen: 3062049K->3062049K(4096000K)] 4899794K->4899794K(6037760K) [PSPermGen: 123099K->123099K(125312K)], 3.1690990 secs] [Times: user=3.16 sys=0.00, real=3.17 secs]
Line 88574 : 42012.319: [GC-- [PSYoungGen: 1837744K->1837744K(1941760K)] 4899794K->4899794K(6037760K), 0.3056590 secs] [Times: user=0.62 sys=0.00, real=0.31 secs]
Line 88575 : 42012.625: [Full GC [PSYoungGen: 1837744K->1813115K(1941760K)] [PSOldGen: 3062049K->3060814K(4096000K)] 4899794K->4873929K(6037760K) [PSPermGen: 123099K->123099K(124800K)], 4.9230010 secs] [Times: user=4.92 sys=0.01, real=4.92 secs]
Line 88576 : 42017.661: [GC-- [PSYoungGen: 1836416K->1836416K(1941760K)] 4897230K->4897230K(6037760K), 0.2799600 secs] [Times: user=0.66 sys=0.00, real=0.28 secs]
The following JVM options were used
-Xms512M -XX:MaxPermSize=260M -Xmx6000M

Any solution on this one?
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Server goes into constant Full GC loop after running for a day

This is a servlet application running under Resin, with Java hotspot 1.5_13 on Linux 64bit OS. JVM args are:
-verbosegc -Xms8G -Xmx8G -XX:NewSize=512m -XX:MaxNewSize=512m -XX:+TraceClassUnloading -XX:+UseParallelGC -XX:PermSize=512M -XX:MaxPermSize=512M -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+DisableExplicitGC
After running for a day or so, the server goes in to constant Full GC every few seconds, essentially hanging the server. Here is an excerpt of the JVM log:
127731.579: [Full GC [PSYoungGen: 156635K->0K(352576K)] [PSOldGen: 7751937K->2260734K(7864320K)] 7908573K->2260734K(8216896K) [PSPermGen: 62855K->62855K(524288K)], 5.2972428 secs]
127737.596: [GC [PSYoungGen: 179328K->157147K(351040K)] 2440062K->2417881K(8215360K), 0.1275439 secs]
127739.066: [GC [PSYoungGen: 336475K->155824K(355136K)] 2709605K->2683786K(8219456K), 0.1729460 secs]
127740.502: [GC [PSYoungGen: 340464K->169143K(353792K)] 2980821K->2836693K(8218112K), 0.1914048 secs]
127741.562: [GC [PSYoungGen: 353783K->166305K(345344K)] 3021333K->2860977K(8209664K), 0.1367291 secs]
127742.973: [GC [PSYoungGen: 340908K->153430K(349568K)] 3147976K->3124907K(8213888K), 0.1970560 secs]
127743.946: [GC [PSYoungGen: 328278K->156065K(349568K)] 3299755K->3277928K(8213888K), 0.1868634 secs]
127745.498: [GC [PSYoungGen: 330183K->156854K(349568K)] 3564442K->3545105K(8213888K), 0.1836370 secs]
From the log it seemed that the memory usage jumped by 150M to 250M within 1.5 second, even when the user traffic was very light (a couple of page views a second, vs. 10 page views a second at peak). The same app was running fine for many hours on a Windows dev machine in load testing condition with about 300M heapsize. No memory leakage was found so far. (it would be pretty unlikely to have such a large memory leakage without being noticed in dev and testing)
Thanks for any help.
Edited by: tuxzilla on Nov 16, 2008 11:43 PM
Edited by: tuxzilla on Nov 16, 2008 11:46 PM

A NewSize of 512m seems small for an 8G heap. This would probably cause most objects to be rapidly tenured into the OldGen heap space. (Ultimately depends on your application.) You might consider either using a NewRatio in place of NewSize/MaxNewSize or not use either and instead see how the jvm handles things itself with"-XX:+UseAdaptiveSizePolicy"
VisualVM is a good graphical tool for watching gc activity.
NewRatio=1 is the largest you can go for Eden, which will set (Eden and survivor spaces) equal to oldGen space. ie, for 8G, 4g each.
Watch activity in the gc tool, you will see "sawtooth" activity. If your sawtooth pattern does not maintain a flat profile, then you have in fact have a memory leak.

Adobe Reader X won't loop a slideshow.

I generate a slideshow in Serif PagePlus and one of the options when I publish to pdf slideshow is "Loop Slideshow". This has worked fine for years, until, by the look of it the installation of AR X. In AR X the slideshow just hangs at the end of the show so my rolling message board no longer works. Setting the Edit > Preferences > Full Screen - "Loop after last page" option in AR enables the slideshow to loop OK. However this isn't needed in previous versions of AR and I can't reckon on all users having this option set.
Is it a bug?
Art

I did the following and it fixed the problem...
Let us assign permissions to the C drive(or the drive where you have installed the OS) and then check.
To apply permissions to a file or folder for a user:
a. Right-click on the C drive and then click Properties.
c. Click the Security tab, and then click Edit.
d. Do one of the following:
i. To set permissions for a user that is not listed under Group or user names, click Add, type the name of the user or group, click OK, select the permissions, and then click OK.
ii. To change or remove permissions from an existing group or user, click the name of the group or user, select the permissions, and then click OK.

Full GC bug with JVM 1.5.0

Hi people,
Since we switched from JRE 1.5.0_08 to 1.5.0_11_64, we are encountering application freezes due to infinite full GC loops.
Sun mentionned this runtime problem as bug 6545719 (*http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6545719*) since jre 1.5.0_11 fixed in version 1.5.0_15.
I asbolutely need to reproduce the bug before we switch to jre 1.5.0_15. The problem is that i can't find the PermLeak.java class mentionned in the URL above.
Can anybody tell me how/where can i get this class?
Thanx in advance

The test case was submitted by a third party, so we (Sun) need approval to release it. It's easier to describe how to write your own test. Use an infinite loop that appends to a string variable s and then calls s.intern() on each iteration. You want s to fill the permanent generation (default 64MB), so best to grow it quickly. You also need to use s somewhere in the loop, by printing out part of it, or printing its length. Otherwise if the method is compiled it might get optimized away. Good luck.
-John

Data model - is tables and relationships between them are graph or tree

Hello
I want to ask if tables in database are nodes of graph what should this graph looks like - like real graph (with
cycles) or tree ?
Let the tables are nodes of graph and the relationships between the tables are edges in the graph.
10x all
Edited by: user10860289 on Apr 2, 2009 1:37 PM
Edited by: user10860289 on Apr 2, 2009 1:37 PM
Edited by: user10860289 on Apr 2, 2009 1:39 PM
Edited by: user10860289 on Apr 2, 2009 2:04 PM

You can put the \ tag before and after text to preserve white space. That likely makes things easier to read if you're trying to post ASCII graphs.
I wouldn't hesitate to use the proper set of tables and relationships for the entities I was trying to model. Would I be concerned if my data model were full of loops? Sure, that might cause me to double-check that I hadn't done something silly. Would I be concerned if my data model had a loop if that was the best way to model something? Not at all.
There is no theoretical answer because the quality of a data model has nothing to do with whether it is more tree-like or more graph-like.
Justin

Organizing images for a photo album (to be printed) not working as expected

I am trying to create a group of selects from a vacation from which I will print 40 non-snorkeling photos to put in a physical photo album. Here’s what I’m doing:
Created project Hawaii, imported about 400 images.
Created keywords "Hawaii", “Snorkeling Trip” and “Everything Else”
Created Smart Album “Land and Air” with keywords “Hawaii” and “Everything Else”
Created Smart Album “Snorkeling Trip” with keywords “Hawaii” and “Snorkeling Trip”
Created empty Album “Photo Album”
At this point I have about 400 images in the project Hawaii, 350 in Smart Album “Land and Air” and 50 in Smart Album “Snorkeling Trip”. So far everything is working as expected.
Next I selected the Smart Album “Land and Air”, switched to the Ratings & Keywords view, walked through all images and found 40 to rate 5-stars. I also cropped and made some adjustments.
Next I re-arranged these 40 selects to an order that better depicts a story. Note: At this point the sort field indicates “Custom” as expected.
Next I dragged these 40 selects into empty Album “Photo Album”. This is where the problems begin:
In the Album "Photo Album", the sort order changed to “Image Date” and “Custom” is now grayed out. I can not change the order of the images.
All of these images are “- version 2”. If I click on the Smart Album “Land and Air” these 40 “- version 2” images appear there, too, in addition to the ones that are already there. I.E. There are 40 more images in “Land and Air”, 40 of the original images and 40 of “- version 2”. Interestingly, the originals and “- version 2” images are identical – they are both cropped and adjusted.
I’m confused as to why there are “- version 2” images when they are the same (with crops and adjustments) as version "1”. What I expected was to just have the 40 images I selected out and arranged in the Album “Photo Album” and the original 40 in Smart Album “Land and Air” not duplicated and would (or perhaps would not?) reflect the crops and adjustments, and keywording.
How should I be doing this? What am I doing wrong?

Beardheart wrote:
The problem is that when I open a new project and try to use that loop, the loop doesn't appear in the loop browser.
http://www.bulletsandbones.com/GB/GBFAQ.html#missingloops ?
(Let the page FULLY load. The link to your answer is at the top of your screen)
I assumed a loop added to the library would be available for all users
no, only the user that created it
and all projects,
see the first link
if I could just export this loop as a wav file
GB only exports AIFF, AAC, and mp3, however you can convert them to a wav if you need to:
http://www.bulletsandbones.com/GB/GBFAQ.html#converttowav
(Let the page FULLY load. The link to your answer is at the top of your screen)
to the desktop or something and then pull it into the new project, but I can't find any way to do that.
export the part you want:
http://www.bulletsandbones.com/GB/GBFAQ.html#exportsections
(Let the page FULLY load. The link to your answer is at the top of your screen)
and import that:
http://www.bulletsandbones.com/GB/GBFAQ.html#importaudio
(Let the page FULLY load. The link to your answer is at the top of your screen)
I looked under /Library/Audio/Apple Loops/Apple/Apple Loops for Garageband {...} and that folder is full of loops, but not the one I have created.
http://www.bulletsandbones.com/GB/GBFAQ.html#myloopsstored
(Let the page FULLY load. The link to your answer is at the top of your screen)

Is there a Quicktime movie Jukebox plugin or software option available?

I currently air television programing on my commercial cable channel by using a Mac in my studio playing a single eight hour full quality quicktime movie file in full screen loop. The video and audio are then feed to a single slingbox in the office. The sling box is programed for remote viewing and is picked by another Mac at the cable company header. That computer then feeds the full screen quicktime video and audio into the cable company modulator, which broadcast the looped full quality quicktime that is running in loop at the studio.
PROBLEM - In order to update and revise footage I have to create another 70 GB full quality quicktime file with the new content. If I were able to create mutipule smaller individual full quality quicktime files and play them thru a juke box solution with loop I could then just replace the individual smaller quicktime program files individually without having to crate a complete new huge full quality quicktime file. Bottom line is there a way to duplicate the iTune random and loop play found for audio files in itunes for Quicktime Movies. Any ideas would be greatly appreciated.

You'll need this plugin.
http://www.hamburgpromedia.com/products/mxf4mac/FCP-X-support/Final-Cut-Pro-X-su pport.php

Mic Sampling - Smallest Sample size?

I presumed if I use line.read(), it will return as soon as it reads the number of bytes requested, however I'm finding that it won't return until a much larger sample has been taken.
I initialize AudioFormat: (rate = 44100)
return new AudioFormat(rate, 16, 1, true, false);
I run this in a full-out loop:
int available = line.available();
System.out.println(line.available());
int read = line.read(tmp, 0, 916);
What I see is that line.available will reach some number around 10k and then actually start returning samples, here's a typical output:
11016
10100
9184
8268
7352
6436
5520
4604
3688
2772
1856
940
24
(notice it decreases by 916 each time, as if no new samples are coming in)
Its apparently waiting until it has a certain number of samples and then "releasing" them to the line.read() method. Doing some testing, apparently if I wait until .available() >= 2756, I can actually obtain just that number of samples. I see that 2756 is 44.1k / 16. HOWEVER, if I put 2756 in the .read() line above, it still waits until it gets to about 10k samples before "releasing" the data, it only works if I test the .available() for having 2756 bytes.
I'm trying to do close to real-time data analysis, but if it waits to release the samples, I have to wait too, I'd really like to get to 916 sample frame (of the most recent data of course). Is this the API, my hardware, or is there a better way/API? Funny because on Android this is not a problem at all, it notifies me at the rate I choose.
Help!,
J

803100 wrote:
I realized that I could change the buffer size smaller by using line.open(..., bufferSize), that seems to do the trick. However, now that its so small, how do I know if I'm losing bytes?Why would you be losing bytes?

Shuffle icon from most recent update rendered next to useless !!

I love my 64g touch very much. I do construction work & it is vital to the work day. Well since the most recent update which i downloaded & installed like 2 weeks ago the "shuffle" icon is a choice between either shuffle or repeat 1 song over & over for eternity. Before the it was a choice between loop album (?)(which is what i need to get again), loop 1 song, or shuffle. Before this most recent update i was able to click a very small icon that sat above the displayed album cover & set "shuffle" to my liking by clicking the icon, NOW I CANNOT !! Now i get 1 of 2 settings, either the repeat 1 song for eternity setting (which has got to be the most useless setting ever) or the completely random shuffle of which i have no control or desire to use. I SIMPLY WANT TO LOOP THE ENTIRE ALBUM THAT I AM LISTENING TO LIKE I USED TO BE ABLE TO DO JUST 2 WEEKS AGO (but then my 2 year old son messed with my ipod & i lost the setting that i liked))!!
Please help !! Thank you

Ok, just to help anyone else who might face tis situation:
I was wrong!! The blue or white loop selection icon is still there. Take your iPod & hold it so the longer side is standing up vertically, get it so that you can see an album cover while a song is playing, underneath the second counter on the left side of the screen there will be a loop (either white or blue), tap it. This will give you one of 3 settings, here are there descriptions:
Full Blue Loop: Continuous loop of current album or playlist
Full Blue Loop with a small 1: Loop 1 song
White Loop: Loop is now off.
I hope this helps someone out there !! I broke down & went to the apple store & got help, i couldnt find the answer here (or so i thought lol!!).

How to use read statement on a select options

Hi all,
I am trying to read the all the values on user selection screen select options.
I have an internal table loaded with data.
So while looping this internal table, I need to check the table certain tank field (lgort) against the select options tank values entered by user.
It is fine when user uses the multiple values on the select options since I use the "READ" statement on the select options and get the matching values.
Example: when user uses the multiple value selection on a select-options to enter values A554 and A555
The select-options table will be:
sign   option    low         high
I          EQ       A554
I          EQ       A555
LOOP AT gt_output_location INTO gw_output.
READ TABLE s_lgort INTO gw_lgort WITH KEY low = gw_output-lgort.
    IF sy-subrc = 0.
    * append row to another table.
    ENDIF.
ENDLOOP.
Problem:
Example: when user uses range on a select-options to enter values A554 and A555
sign   option    low         high
I          BT      A554       A555
The read statement can only get matching value A554.
LOOP AT gt_output_location INTO gw_output.
READ TABLE s_lgort INTO gw_lgort WITH KEY low = gw_output-lgort.
    IF sy-subrc = 0.
    * append row to another table.
    ENDIF.
ENDLOOP.
Anyone have any idea on this?? Thanks!!

Hi all, I need to consider each and every lines of the gt_output_location as there are other fields need to consider also. Basically I am checking each and every lines of this table to see which lines I need to append to another table.
That is why I did not use "LOOP AT gt_output_location INTO gw_output WHERE lgort IN s_lgort"
The full gt_output_location:
LOOP AT gt_output_location INTO gw_output.
*      IF p_lgort = space AND p_umlgo = space.
       IF gv_lines_lgort = 0 AND gv_lines_umlgo = 0.
*       only append those from tank <> to tank
         IF gw_output-lgort <> gw_output-umlgo.
           APPEND gw_output to gt_output.
           CLEAR gw_output.
         ELSE. "from tank == to tank
*         append those from plant <> to plant
           IF gw_output-werks <> gw_output-umwrk.
             APPEND gw_output to gt_output.
             CLEAR gw_output.
           ENDIF.
         ENDIF.
*      ELSEIF p_lgort = space AND p_umlgo <> space.
       ELSEIF gv_lines_lgort = 0 AND gv_lines_umlgo > 0.
*        IF gw_output-umlgo = p_umlgo.
         READ TABLE s_umlgo INTO gw_umlgo WITH KEY low = gw_output-umlgo.
         IF sy-subrc = 0.
*         only append those from tank <> to tank
           IF gw_output-lgort <> gw_output-umlgo.
             APPEND gw_output to gt_output.
             CLEAR gw_output.
           ELSE. "from tank == to tank
*           append those from plant <> to plant
             IF gw_output-werks <> gw_output-umwrk.
               APPEND gw_output to gt_output.
               CLEAR gw_output.
             ENDIF.
           ENDIF.
         ENDIF.
*      ELSEIF p_umlgo = space AND p_lgort <> space.
       ELSEIF gv_lines_umlgo = 0 AND gv_lines_lgort > 0.
*        IF gw_output-lgort = p_lgort.
         READ TABLE s_lgort INTO gw_lgort WITH KEY low = gw_output-lgort.
         IF sy-subrc = 0.
*         only append those from tank <> to tank
           IF gw_output-lgort <> gw_output-umlgo.
             APPEND gw_output to gt_output.
             CLEAR gw_output.
           ELSE. "from tank == to tank
*           append those from plant <> to plant
             IF gw_output-werks <> gw_output-umwrk.
               APPEND gw_output to gt_output.
               CLEAR gw_output.
             ENDIF.
           ENDIF.
         ENDIF.
       ELSE.
*        IF gw_output-lgort = p_lgort AND gw_output-umlgo = p_umlgo.
         READ TABLE s_lgort INTO gw_lgort WITH KEY low = gw_output-lgort.
         IF sy-subrc = 0.
*         only append those from tank <> to tank
           IF gw_output-lgort <> gw_output-umlgo.
             APPEND gw_output to gt_output.
             CLEAR gw_output.
           ELSE. "from tank == to tank
*           append those from plant <> to plant
             IF gw_output-werks <> gw_output-umwrk.
               APPEND gw_output to gt_output.
               CLEAR gw_output.
             ENDIF.
           ENDIF.
         ENDIF.
         READ TABLE s_umlgo INTO gw_umlgo WITH KEY low = gw_output-umlgo.
         IF sy-subrc = 0.
*         only append those from tank <> to tank
           IF gw_output-lgort <> gw_output-umlgo.
             APPEND gw_output to gt_output.
             CLEAR gw_output.
           ELSE. "from tank == to tank
*           append those from plant <> to plant
             IF gw_output-werks <> gw_output-umwrk.
               APPEND gw_output to gt_output.
               CLEAR gw_output.
             ENDIF.
           ENDIF.
         ENDIF.
       ENDIF.
       CLEAR gw_lgort.
       CLEAR gw_umlgo.
     ENDLOOP.

Looking to move tgo infinity and need advice

I am currently an o2 broadband and home phone customer looking to move to BT infinity. I have justr rang o2 and been told i dont need a MAC code as this would be a more expensive way of switching. Instead i should just order with BT and notify o2 of when infinity will start and give them 7 days notice to cancel their service.
Is this correct? In the past when moving broadband (and home phone) i just obtained a MAC code and gave it to the new supllier and everything was sorted. So whats the best method of switching to infinity?

jamesr70 wrote:
Is a MAC code of any use for VDSL (BT Infinity)? Does moving from a LLU ADSL provider to BT Infinity cause any issues? Just curious more than anything.
I have heard different things from different people.
I would suggest that IF you can get a MAC code then get it, then OFFER it to the new provider, that way you cannot go wrong.
This is taken from Ofcoms site:
A Migration Authorisation Code or MAC is a unique code which identifies a particular line and enables customers to switch internet service providers smoothly and with minimal disruption.
Once you decide you want to switch broadband provider you ask your ISP for a MAC code.
It consists of four letters beginning with L followed by between seven and nine numbers, a slash, and five alphanumeric characters (e.g. LAEM1234567/1F6HT).
Under Ofcom regulations, where a consumer or small business (with 10 or less employees) wishes to change broadband provider, a MAC must be issued within 5 working days of the request.
Companies must offer at least two methods of providing a MAC (by email, phone or post etc).
You should then present the MAC to the ISP you want to switch to and it will then process the request to migrate and inform you of the transfer date. The service should then be transferred seamlessly and with little or no disruption of service.
However, there are some circumstances where the losing broadband supplier can refuse to provide a MAC. These are:
•    the broadband supplier cannot confirm they are dealing with the named account holder
•    the broadband service has already been disconnected or in the process of being disconnected
•    the broadband supplier has already issued a MAC and it is still valid
•    the broadband supplier is unable to obtain the MAC from their own supplier
•    the broadband service is supplied through a full Local Loop Unbundling package
If any of the above apply to your particular service, your broadband supplier must make this clear to you.
Where the MAC process does not apply, the losing broadband supplier should make arrangements for the ‘tag’ to be removed from the line. This should be done within 10 working days and will allow you to have services with the provider of your choice.
toekneem
http://www.no2nuisancecalls.net
(EASBF)

Best Place to design a slideshow to burn and view off a CD

Sorry if this is the wrong forum. In the old format there used to be a place to choose questions regarding the Creative Suite in general. Can't find it. So if this is wrong, please advise where I should be. Thanks.
I have a client that wants me to design a slideshow for her son's wedding. She will be playing it on her MAC at the event. Having the whole suite CS5 extended) and realize that you can do almost anything in many places, where is the best place to assemble, and burn the CD. I will be making custom slides (maybe 100). They will have photos and text on them (not just an iphoto picture slideshow...I don't think, or don't want to rely on a person's computer having iphoto). I was thinking maybe Acrobat or InDesign? Thoughts?
Thanks

Here's how to do it using Acrobat:
You will want to consider the aspect ratio of the projector or TV and make your multi page PDF match.
1. In Acrobat, go to Advanced> Document Processing> Page transitions> (Fade), auto flip, all pages.
2. File> Properties> Initial view> Open in full screen mode, save. (open the PDF once and say remember this choice, or something like that, save).
3. Acrobat> Preferences> General> Full Screen> loop after last page. You will need to explain this last part to the person who will be playing the CD.

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