Description of the flags used for the Fujitsu SPECjbb2000 results:
Fujitsu Ltd.
Oct 26, 2005


< Hardware setting >
Memory system is in "Non Mirror Mode".

PRIMEQUEST 480 memory system supports DSSA (Dual Sync System
Architecture )
and works in one of following two mode.


(1) Mirror Mode
   Address buses and Data buses are duplicated.
   And  most of internal action of chipset is also duplicated.

   In this mode, system memory throughput becomes half but higher
   reliability is expected by the memory system duplication.


(2) Non Mirror Mode
   Address buses and data buses are not duplicated.
   And the internal action of chipset is not duplicated.

   In this mode, full memory bandwidth is available,
   but the system duplication for higher reliability does not work.

Please see the detail of DSSA in the attached file.
"Fujitsu-linux-20051026_2.pdf".

< Policy setting >

numactl --interleave=all 
	Interleave memory allocations on a set of nodes

< JVM Command Line Options >
-Xms

	Sets the initial size of the heap. 
	This value can be specified in kilobytes (K,k), megabytes (M,m), or gigabytes (G,g).

	Default:
	The default value depends upon the JVM mode: 
	-server mode: The default value is the lesser of 25% of the free physical memory or 64 MB. 
	-client mode: The default value is the lesser of 25% of the free physical memory or 16 MB. 

-Xmx

	Sets the maximum size of the heap. 
	This value can be specified in kilobytes (K,k), megabytes (M,m), or gigabytes (G,g).
	Use the following guidelines to determine this value:

	Default:
	The default value is the lesser of 75% of the total physical memory or 1 GB. 

-XXaggressive

	Performs adaptive optimizations as early as possible in the Java
	application run. To do this, the bottleneck detector will run with
	a higher frequency from the start and then gradually lower
	its frequency. This options also tells BEA JRockit to use the available
	memory aggressively. 

-XXcompactratio0

	Sets how much (measured in percentage) of the Java heap that will be
	compacted when BEA JRockit perfoms a garbage collection.

-XXhpm

	This option uses hardware performance counters instead of software
	sampling in the Hotspot detector, which drives optimizations.
	The hardware performance counters gives higher accuracy for the hot
	spots sampling with better performance. This option is available and
	supported on Itanium for Red Hat 4.0 and SuSE 9.0. 

-XXtlasize=256k
	
	This flag specifies how large a Thread Local Area (TLA) should be.
	A TLA is a chunk of memory on the heap where a thread creates objects.
	The thread has exclusive use on this area and therefore object
	allocations are very cheap inside the TLA.

-XXlargeObjectLimit=128k

	This flag specifies the limit for when objects are treated as large objects.
	This value can be specified in kilobytes (K,k), megabytes (M,m),
	or gigabytes (G,g). 

	Default: 
	The default value is 2k.