15 computer science collegians looking for a project

[Reinier Heeres]

Hi,

The problem you encountered was apparently caused by the compiler 
warning. Renaming all instances of 'round' with something else resulted 
in the following here (also a C2):

[olpc at xo-0C-EC-18 ~]$ ./calibrator 431 4M callog

Calibrator v0.9e
(by Stefan.Manegold at cwi.nl, http://www.cwi.nl/~manegold/)
b790c008 -1215250424 4096 -4088
b790cfff -1215246337 4096    -1
b790d000 -1215246336 4096     0

MINTIME = 10000

analyzing cache throughput...
      range      stride       spots     brutto-  netto-time
    5242880           4     1310720       12472        3118

analyzing cache latency...
      range      stride       spots     brutto-  netto-time
    5242880           4     1310720      195660       97830

analyzing TLB latency...
      range      stride       spots     brutto-  netto-time
    1081344        1056        1024       10858        5429


CPU loop + L1 access:      19.81 ns =   9 cy
             ( delay:     959.51 ns = 414 cy )

caches:
level  size    linesize   miss-latency        replace-time
  1     64 KB   32 bytes   22.75 ns =  10 cy   23.15 ns =  10 cy
  2    192 KB   32 bytes   64.73 ns =  28 cy   76.50 ns =  33 cy

TLBs:
level #entries  pagesize  miss-latency
  1       80       4 KB   126.25 ns =  54 cy

Cheers,
Reinier

Martin Dengler wrote:
> On Wed, Apr 30, 2008 at 10:18:24AM +0200, NoiseEHC wrote:
>   
>>> http://homepages.cwi.nl/~manegold/Calibrator/
>>>  
>>>       
>> Could you run on your machine and share the results? Currently I do 
>> not have access to an XO.
>>     
>
> Probably not the results you were looking for:
>
> bash-3.2$ echo `cat /ofw/ec-name`
> PQ2D13
> bash-3.2$ echo `cat /ofw/model`
> C2
> bash-3.2$ echo `cat /boot/olpc_build`
> joyride 1897
> bash-3.2$ uname -r
> 2.6.22-20080408.1.olpc.de2a86ff3b60edc
> bash-3.2$ gcc --version
> gcc (GCC) 4.1.2 20070925 (Red Hat 4.1.2-27)
> Copyright (C) 2006 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> bash-3.2$ gcc calibrator.c -o calibrator -lm
> calibrator.c:132: warning: conflicting types for built-in function ÃoundÃ
> bash-3.2$ ./calibrator 431 2M calibrator_OLPC_C2
>
> Calibrator v0.9e
> (by Stefan.Manegold at cwi.nl, http://www.cwi.nl/~manegold/)
> b7b50008 -1212874744 4096 -4088
> b7b50fff -1212870657 4096    -1
> b7b51000 -1212870656 4096     0
>
> MINTIME = 10000
>
> analyzing cache throughput...
>       range      stride       spots     brutto-  netto-time
>     2621440           4      655360       12544        3136
>
> analyzing cache latency...
>       range      stride       spots     brutto-  netto-time
>     2621440           4      655360      195740       97870
>
> analyzing TLB latency...
>       range      stride       spots     brutto-  netto-time
>     3244032        1056        3072Segmentation fault
> bash-3.2$
>
> Martin
>   
> ------------------------------------------------------------------------
>
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>   

-- 
Reinier Heeres
Waalstraat 17
2515 XK Den Haag
The Netherlands

Tel: +31 6 10852639