Chip Timing Speed Tests

Technical Support for Routers
1

I used the following Awk Script to run a Test on the Commands Speed of Awk,
by Clocking the Toggle of the GPIO14 LED.
I tweaked I=35700 in the two for() loops until I clocked the GPIO LED close to 1Hz.
Giving about 357000 Awk Commands per Second.

I wrote the Script into /tmp :


cd /tmp
vi gpioTmr
chmod 777 gpioTmr
/tmp/gpioTmr

And, the Script :


#!/usr/bin/awk -f
## Blink GPIO #14 LED at 1Hz :
## IPS = ( 35700 * 2 * (5 cmdsPerLoop) ) = 357000 Awk InstructionsPerSecond 

BEGIN
{
  P = 14;
  CNT = 35700;

  while(1)
  {
    for(I=0; I<35700; I++)
    {
    }

    print 0     > "/sys/class/gpio/gpio" P "/value"

    for(I=0; I<35700; I++)
    {
    }

    print 1     > "/sys/class/gpio/gpio" P "/value"
  }
}
2

The following Script shows the speed of using the ASH Shell.
I clocked it at about 61500 Instructions Per Second:


#!/bin/ash
## loopTmrAsh
## - 13 seconds
## IPS = (100000 * (8 CommandsPerLoop) / 13 seconds) = 61500 Hz InstructionsPerSecond
## * 77000 => 10 seconds

X=0
#while [ $X -le 100000 ]
while [ $X -le 77000 ]
do
#       echo $X
        X=$((X+1))
done
3

Below is a Script to Blink the LEDs as Counters:


#!/bin/ash
## loopLeds

echo "0" > /sys/class/gpio/gpio14/value

T=0
C14=0
while [ $T -le 77000 ]
do
#       echo $T
  T=$((T+1))

  C14=$((C14+1))

  if [ $C14 -eq 1000 ]; then
    echo "1" > /sys/class/gpio/gpio14/value
  fi
  if [ $C14 -gt 2000 ]; then
    echo "0" > /sys/class/gpio/gpio14/value
    C14=0
  fi

  C15=$((C15+1))
  if [ $C15 -eq 2000 ]; then
    echo "1" > /sys/class/gpio/gpio15/value
  fi
  if [ $C15 -gt 4000 ]; then
    echo "0" > /sys/class/gpio/gpio15/value
    C15=0
  fi

  C16=$((C16+1))
  if [ $C16 -eq 4000 ]; then
    echo "1" > /sys/class/gpio/gpio16/value
  fi
  if [ $C16 -gt 8000 ]; then
    echo "0" > /sys/class/gpio/gpio16/value
    C16=0
  fi
done
4

And an amusing Script to sweep the LEDs like a cylon:


#!/bin/ash
## ledsCylon

#echo "0" > /sys/class/gpio/gpio14/value

T=0
C14=0
while [ $T -le 77000 ]
do
#       echo $T
  T=$((T+1))

  C14=$((C14+1))

  if [ $C14 -eq 1000 ]; then
    echo "0" > /sys/class/gpio/gpio14/value
    echo "1" > /sys/class/gpio/gpio15/value
    echo "0" > /sys/class/gpio/gpio16/value
  fi
  if [ $C14 -eq 2000 ]; then
    echo "0" > /sys/class/gpio/gpio14/value
    echo "0" > /sys/class/gpio/gpio15/value
    echo "1" > /sys/class/gpio/gpio16/value
  fi
  if [ $C14 -eq 3000 ]; then
    echo "0" > /sys/class/gpio/gpio14/value
    echo "1" > /sys/class/gpio/gpio15/value
    echo "0" > /sys/class/gpio/gpio16/value
  fi
  if [ $C14 -eq 4000 ]; then
    echo "1" > /sys/class/gpio/gpio14/value
    echo "0" > /sys/class/gpio/gpio15/value
    echo "0" > /sys/class/gpio/gpio16/value
    C14=0
  fi

done
5

hello what test result does it indicate?

6

Well, the IPS are listed above, these are oly for the Scripts.
I would like to test C Code, but I need a GCC Compiler first.

I also want to test Python and Perl.

7

All I can find to use is SH and ASH and AWK.
No Perl or Python or GCC.

Anybody find anything else to Code in and/or Test ??

8

I tested SH which seems to run same speed as ASH.
Below SH Script blinks GPIO16 LED at about 1Hz:


#!/bin/sh
## blkTmrSh

X=0
C16=0
#while [ $X -le 100000 ]
while [ $X -le 77000 ]
do
#  echo $X
  X=$((X+1))

  C16=$((C16+1))
  if [ $C16 -eq 1500 ]; then
    echo "1" > /sys/class/gpio/gpio16/value
  fi
  if [ $C16 -gt 3000 ]; then
    echo "0" > /sys/class/gpio/gpio16/value
    C16=0
  fi
done
9

Task Complete !

I clocked the Compiled C code to 200 MIPS.
Supposed to be 400 MHz ?

  • Maybe because of LONG int ? - or MultiTasking ?
    Anyway - FAST enough for ME !

I used a Loop of 400,000,000 iterations, of probably 5 commands per loop - took 10 seconds.
> ((400000000 iterations * 5 cmdsPerLoop) / 10 seconds) = 200,000,000 = 200 MIPS

I downloaded YunGcc.tgz and UnTARred it onto my SDCard,
then compiled using GCC feom SD Card :


// testSpd.c : //
// - loop=400,000,000 => IPS = ((400000000 * 5) / 10 seconds) = 200 MIPS

#include <stdio.h>

void main()
{
long  i;

  printf("Start ..\n");

  for(i=0;i<400000000;i++)
  {
  }

  printf("Done !\n");
}

root@domino:/mnt/sda2/Code# gcc testSpd.c
  /mnt/sda2/gcc/bin/ld: Warning: a.out uses -msoft-float (set by /mnt/sda2/gcc/bin/../lib/gcc/mips-openwrt-linux-uclibc/4.6.4/crtbegin.o), /tmp/cc80ZcyD.o uses -mhard-float

root@domino:/mnt/sda2/Code# ./a.out
  Start ..
  Done !

root@domino:/mnt/sda2/Code#
10

so, you can compile c program on the board directly now? This is nice!

11

Just plug the SD Card into the USB Port with the GCC image.
I was using the PI.
But, I should be able to install a USB on the Core Board with minimal effort,

  • with the same result.
12

What GCC is capable of doing? Can it control OI?

Where can the GCC image be downloaded and how to install into the USB?