Event Builder Related Information

Last Update (13-Mar-1996)
VME Memory Access Speed

VME Memory Access Speed measured by H.Fujii (Mar '96).

[VME

Setup:

PIO Memory access speed 

------------------------------------
Device = "/dev/vme32d32"
Access = File I/O
------------------------------------
Block Size  Read Speed  Write Speed
   (KB)      (MB/sec)     (MB/sec)
----------  ----------  ------------
    1          1.62         2.18
    2          2.18         3.20
    3          2.45         3.92
    4          2.63         4.34
    5          2.42         3.76
    6          2.53         4.05
    7          2.62         4.28
    8          2.69         4.43
    9          2.56         4.11
   10          2.62         4.27
   11          2.67         4.41
   12          2.72         4.51
   13          2.62         4.27
   14          2.66         4.38
   15          2.70         4.47
   16          2.74         4.57
   17          2.65         4.36
-----------------------------------

DMA Memory Access Speed 

-----------------------------------
Device = "/dev/vmedma32d32b"
Access = File I/O
------------------------------------
Block Size  Read Speed  Write Speed
   (KB)      (MB/sec)     (MB/sec)
----------  ----------  ------------
     1         0.92         0.95
     2         1.57         1.58
     3         2.15         2.38
     4         2.82         2.97
     5         3.54         3.67
     6         3.92         4.18
     7         4.32         5.12
     8         4.92         5.15
     9         5.22         5.72
    10         5.72         6.13
    11         5.72         6.65
    12         6.24         6.87
    13         6.52         7.42
    14         6.91         7.37
    15         7.01         8.19
    16         7.16         8.26
    17         7.70         8.46
-----------------------------------