On Fri, Aug 24, 2012 at 8:41 PM, Garey Mills <gmi...@library.berkeley.edu>wrote:
> Here is the jmap histogram run after tomcat is started.
>
>
> [tcatmgr2@dlab-gis bin]$ jmap -histo:live 14521 | head -25
>
> num #instances #bytes class name
> ----------------------------------------------
> 1: 1778378 120016288 [C
> 2: 1786752 57176064 java.lang.String
> 3: 1673932 40174368
> org.apache.tomcat.util.bcel.classfile.ConstantUtf8
> 4: 197231 25615968 [B
> 5: 811557 19477368
> org.apache.tomcat.util.bcel.classfile.LineNumber
> 6: 458385 18335400
> org.apache.tomcat.util.bcel.classfile.LocalVariable
> 7: 25341 12455776
> [Lorg.apache.tomcat.util.bcel.classfile.Constant;
> 8: 187014 11968896
> org.apache.tomcat.util.bcel.classfile.Code
> 9: 514281 11817520
> [Lorg.apache.tomcat.util.bcel.classfile.Attribute;
> 10: 422252 10134048
> org.apache.tomcat.util.bcel.classfile.ConstantNameAndType
> 11: 212125 8485000
> org.apache.tomcat.util.bcel.classfile.Method
> 12: 305713 7337112
> org.apache.tomcat.util.bcel.classfile.ConstantMethodref
> 13: 157452 6298080
> org.apache.tomcat.util.bcel.classfile.LineNumberTable
> 14: 258174 6196176
> org.apache.tomcat.util.bcel.classfile.ConstantClass
> 15: 157452 6183776
> [Lorg.apache.tomcat.util.bcel.classfile.LineNumber;
> 16: 148378 5935120
> org.apache.tomcat.util.bcel.classfile.LocalVariableTable
> 17: 167932 4929680
> [Lorg.apache.tomcat.util.bcel.classfile.LocalVariable;
> 18: 25497 3678120 <constMethodKlass>
> 19: 89801 3592040
> org.apache.tomcat.util.bcel.classfile.Field
> 20: 25497 3477224 <methodKlass>
> 21: 78548 3141920
> org.apache.tomcat.util.bcel.classfile.StackMapTableEntry
> 22: 187014 3122112
> [Lorg.apache.tomcat.util.bcel.classfile.CodeException;
>
If I use the same startup options as you I get the same problem, from what
I can see
it is a Tomcat 7 specific issue (I used 7.0.29), if I use the same options
in Tomcat 6 GeoServer starts
up fine.
Most of the above is related to bytecode manipulation (don't know what all
those strings
are at the top), one thing I've noticed is that if I increase the heap
memory allowed to
Tomcat 7 the startup completes and the memory usage goes down to a level
similar
to Tomcat 6, that is:
jmap -histo:live 14897 | head -25
num #instances #bytes class name
----------------------------------------------
1: 27446 22004616 [B
2: 111839 17312272 <constMethodKlass>
3: 134189 16593000 [C
4: 111839 15225912 <methodKlass>
5: 11120 13148816 <constantPoolKlass>
6: 13382 12328728 [I
7: 11120 9105688 <instanceKlassKlass>
8: 8929 7064064 <constantPoolCacheKlass>
9: 147909 4733088 java.lang.String
10: 76410 3056400 org.hsqldb.DiskNode
11: 66163 2117216 java.util.HashMap$Entry
12: 30232 1993960 [Ljava.lang.Object;
13: 22091 1884912 [Ljava.util.HashMap$Entry;
14: 2890 1621080 <methodDataKlass>
15: 11878 1460640 java.lang.Class
16: 16589 1327120 java.lang.reflect.Method
17: 16231 1065800 [S
18: 17802 874552 [[I
19: 16229 778992 java.util.HashMap
20: 24216 774912
java.util.concurrent.ConcurrentHashMap$HashEntry
21: 9561 611904 java.net.URL
22: 11654 559392 org.apache.catalina.loader.ResourceEntry
So, it seems that Tomcat 7 is requiring more heap to perform the startup of
a large application such as GeoServer
Cheers
Andrea
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