Oracle Unbreakable Enterprise Kernel Release 2

Попался мне интересный документ: Oracle Unbreakable Enterprise Kernel Release 2 Release Notes

Весьма рекомендую всем почитать.
Что привлекло мое внимание в новом ядре :
Transparent Huge Pages - dynamically allocating hugepages
Memory compaction - merge used pages into a new big block of contiguous pages
Transmit Packet Steering - spreading of outcoming network traffic across all CPUs in system


  

New SUN SPARC T4 processor.

Oracle says about T4 as the very fast CPU:

http://www.pcweek.ru/business/article/detail.php?ID=138973

But in our tests we obtained very other results. About 4 times slowly than x86-64.

With the help of my friends Alex and Dmitry we did the our own tpc.org performance table:

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                             Time in sec    CPUSPEEDNW 
                                                       
SuperMicro Xeon X5675 3.07GHz  35               1399   
                                                       
Exadata X2-2                                    2974 UTF8
Xeon X5675 3.07GHz             36               2979 ISO
                                                2961 WIN
                                                       
Core2 Quad Q9550 2.83GHz       44                      
Core2 Quad Q9505 2.83GHz       46               1705   
                                                       
Oracle Database Appliance      56                678   
                X5675 3.07GHz                          
                                                       
IBM,AM720_090, PowerPC_POWER7  74                719   
                      3108MHz                          
                                                       
IBM,7998-61X, POWER6, 4005MHz 115                738   
                                                       
Sun SPARC T4                  127               1178   
                                                       
Sun SPARC Enterprise M4000    123                626   
                     2150MHz                           
                                                       
Sun Fire V440  1593MHz        177                774   
                                                       
Sun Fire V490,  1050MGz       284                680   
SPARC IV                                               
                                                       
                                                       
SuperDome 9000/800/S16K-A,   1079                146   
PA8700 3.1 875MHz                                       

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What we did ?

We run the very simple test script, which test only one core in system and not uses memory and IO. So only register operations are important :

SQL> SET ECHO ON;
SET TIMING ON;
SQL> SQL> declare
  2    a number := 0;
  3  begin
  4     for i in 1 .. 1e9
  5     loop
  6         a := a + 1;
  7     end loop;
  8  end;
  9  /
 
Set lines 1000 pages 1000
select * from sys.aux_stats$;


As a result we can say that:

- T4 is one of slowest cores
- the best choise is x86-64 !