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參數資料
| 型號： | BENCHMARKING |
| 英文描述： | Benchmarking the Am186EM: Using the Dhrystone V2.1 As An Example Application Note? 1.66MB (PDF) |
| 中文描述： | 基準Am186EM：作為示例應用注意Dhrystone的V2.1版本？ 1.66MB（PDF格式） |
| 文件頁數： | 36/88頁 |
| 文件大?。?/td> | 1701K |
| 代理商： | BENCHMARKING |
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As a final note, use of file I/O and the timers themselves by the benchmark is not
allowed. The current development tools do not support disk file transactions
such as ‘fopen()’ or ‘fgetc()’. The timers are off-limits because they are being
used to time the benchmark.
Instrumenting the Code
As can be seen in the “dhry_1.c “ source code, all that is needed is to follow this
simple template.
The AMD supplied files include a directory called ‘bench’. In this directory is a
set of files which allow you to simply edit your benchmark source code into an
existing file “bench.c” (edit out what is already there). After you copy the needed
Paradigm and Borland files into this directory you should be able to type ‘make’
at the DOS prompt to have a completed benchmark named “bench.axe”.
In your include section:
#include “timer.h” // required for operation of the counter timers
#include “eleds.h” // optional, allows you to see start and stop of your program
In your main() section:
T_Time Ttest_time; // structure to hold the contents of the counter timer registers
float loop_time,total_time,bench_time; // times stored in seconds
In your initialization code section (inside main()):
ledinit(); // initialize the LED outputs
nowait(); // set the Am186EM to
0
wait states
timer_init(); // initialize the counter timers and set all counts to 0
Just before you start into the timed code:
/***************/
/* Start timer */
/***************/
#ifdef AM186EM // optional, conditional compilation,
If your benchmark requires multiple passes, you
must insert this code. The time consumed in the
loop overhead must be subtracted out of the total
running time (as done here). If you do not have an
outer loop like this omit this section of the code.
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