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Re: [Fedora-ia64-list] RFC: Thoughts on SPARSE memory



lmbench results for 4p/4G SGI 330, and 64p/128G SGI 3700bx2 ...


                 L M B E N C H  2 . 0   S U M M A R Y
                 ------------------------------------


Basic system parameters
----------------------------------------------------
Host                 OS Description              Mhz
                                                    
--------- ------------- ----------------------- ----
4p-DISCON Linux 2.6.17-          ia64-linux-gnu 1503
4p-SPARSE Linux 2.6.17-          ia64-linux-gnu 1503
64p-DISCO Linux 2.6.17-          ia64-linux-gnu 1503
64p-SPARS Linux 2.6.17-          ia64-linux-gnu 1503

Processor, Processes - times in microseconds - smaller is better
----------------------------------------------------------------
Host                 OS  Mhz null null      open selct sig  sig  fork exec sh  
                             call  I/O stat clos TCP   inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ----
4p-DISCON Linux 2.6.17- 1503 0.03 0.26 23.1 26.1 8.449 0.29 3.20 207. 711. 2856
4p-SPARSE Linux 2.6.17- 1503 0.03 0.27 23.2 26.2 8.004 0.30 3.34 278. 680. 2934
64p-DISCO Linux 2.6.17- 1503 0.03 0.26 23.1 26.2 8.451 0.29 3.17 342. 940. 3522
64p-SPARS Linux 2.6.17- 1503 0.03 0.27 23.2 26.3 8.031 0.30 3.30 312. 950. 3475

Context switching - times in microseconds - smaller is better
-------------------------------------------------------------
Host                 OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
                        ctxsw  ctxsw  ctxsw ctxsw  ctxsw   ctxsw   ctxsw
--------- ------------- ----- ------ ------ ------ ------ ------- -------
4p-DISCON Linux 2.6.17- 1.700   20.3   22.1   20.1   25.3    17.8    25.9
4p-SPARSE Linux 2.6.17-  16.9 2.9700 6.2700   14.2   10.3    16.4    17.3
64p-DISCO Linux 2.6.17-  24.7   22.0   26.3 8.4800   30.1    10.6    31.6
64p-SPARS Linux 2.6.17-  20.1   23.4   27.3   21.9   29.7    18.2    30.1

*Local* Communication latencies in microseconds - smaller is better
-------------------------------------------------------------------
Host                 OS 2p/0K  Pipe AF     UDP  RPC/   TCP  RPC/ TCP
                        ctxsw       UNIX         UDP         TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
4p-DISCON Linux 2.6.17- 1.700  41.2 59.3  88.3  30.6 182.0 196.2 117.
4p-SPARSE Linux 2.6.17-  16.9  38.1 67.7  87.6  94.7 244.9 560.7 158.
64p-DISCO Linux 2.6.17-  24.7  49.3 103. 112.0 121.2 270.0 655.4 118.
64p-SPARS Linux 2.6.17-  20.1  42.4 90.7  98.7  31.0 265.5 196.7 187.

File & VM system latencies in microseconds - smaller is better
--------------------------------------------------------------
Host                 OS   0K File      10K File      Mmap    Prot    Page	
                        Create Delete Create Delete  Latency Fault   Fault 
--------- ------------- ------ ------ ------ ------  ------- -----   ----- 
4p-DISCON Linux 2.6.17-   44.0   37.2   87.7   55.8    11.4K 0.619        
4p-SPARSE Linux 2.6.17-   44.2   37.8   86.7   56.1    12.0K 0.659        
64p-DISCO Linux 2.6.17-   44.2   37.7   88.1   57.1   248.6K 0.578        
64p-SPARS Linux 2.6.17-   44.2   37.7   85.5   56.2   241.8K 0.577        

*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------
Host                OS  Pipe AF    TCP  File   Mmap  Bcopy  Bcopy  Mem   Mem
                             UNIX      reread reread (libc) (hand) read write
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
4p-DISCON Linux 2.6.17- 1039 108. 160. 46306M  422.9  627.2  369.4 637. 597.7
4p-SPARSE Linux 2.6.17- 635. 108. 161. 46449M  508.1  627.1  369.0 637. 597.5
64p-DISCO Linux 2.6.17- 561. 102. 131. 45902M  367.7  316.4  177.4 276. 318.8
64p-SPARS Linux 2.6.17- 625. 103. 131. 45948M  386.9  315.8  177.2 318. 318.3

Memory latencies in nanoseconds - smaller is better
    (WARNING - may not be correct, check graphs)
---------------------------------------------------
Host                 OS   Mhz  L1 $   L2 $    Main mem    Guesses
--------- -------------  ---- ----- ------    --------    -------
4p-DISCON Linux 2.6.17-  1503     -      -           -    Bad mhz?
4p-SPARSE Linux 2.6.17-  1503     -      -           -    Bad mhz?
64p-DISCO Linux 2.6.17-  1503     -      -           -    Bad mhz?
64p-SPARS Linux 2.6.17-  1503     -      -           -    Bad mhz?

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