RFR 8019375: Internal symbol table size should be tunable.

[Coleen Phillimore]

Hi Kevin,

I'm sorry I didn't warn you but I think there are serviceability agent 
changes with this change.   For some reason, I think the SA duplicates 
code in the JVM for the symbol table.

You might get away with only changing this line in 
agent/src/share/classes/sun/jvm/hotspot/memory/SymbolTable.java

     symbolTableSize = 
db.lookupIntConstant("SymbolTable::symbol_table_size").intValue(); to 
use SymbolTableSize.

Then run the nsk.sajdi.testlist tests.

Thanks,
Coleen

On 8/23/2013 5:34 AM, Kevin Walls wrote:
> Hi,
>
> I'd like to get reviews on this change to make the size of the symbol 
> table tunable.  This can be a performance benefit to some apps, i.e. 
> when the symbol table becomes overloaded (see 
> PrintStringTableStatistics output).
>
> This work here actually comes from Coleen.  I'm happy to take any 
> further comments and update.
>
> http://cr.openjdk.java.net/~kevinw/8019375/webrev.01/
> http://bugs.sun.com/view_bug.do?bug_id=8019375
>
> This uses SymbolTableSize as the tunable name.  (Another suggestion 
> and possibile name, was PredictedMaxVMStrings to avoid talking 
> explicity about the internal format.  Comments welcome!...)
>
> Thanks
> Kevin