Host based and Read only Zip files

Altera_Forum · ‎02-26-2007

Hi all,

I got a certain code that I need to run having an input file. I download my program to RAM in general and just use the flash for the file when using the "rozipfs".

I tried using once the host based file system and the other time the zip file and I used the performance counter to track a function that does NOT have any access to files in it. I got a difference of 40 million clocks between both results. What's the reason inspite of having no relation to file opening or samples' calling in the meant function ?

And another thing too, in general which is faster the host-based system or the "rozipfs" ? (meaning JTAG or flash memory)

Thanks in advance

Altera_Forum · ‎02-26-2007

Flash/rozipfs will be much faster. Hostfs is going over a GDB link to your PC.

With respect to your other question, I'm not sure why you're seeing a significant slowdown when using hostfs, however, you'll never be using hostfs in a real-world embedded system, so I can't see that it matters much anyway http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif

Cheers,

- slacker

Altera_Forum · ‎02-26-2007

Thanks Slacker for ur reply, u are right regarding the real-time operations but still it puzzles me, try me one last time, I will elaborate for a last time http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif

My program is as follows:# include "stdio.h"

void filter(int);

int main()

{

MyClass a;

a.openMyFile("/mnt/rozipfs/aser.txt"); //function that opens a file stream

int data = a.readCurrentInput(); //reads an integer from current data

filter(data); //my function that I want to measure its performance

}

void filter(int)

{

int y=data;

/*continue code normally*/

}

/**************************************

***************************************/

I want to measure the performance of "filter(data)" for zip files and host based files. I get more time in case of ZIP FILE system ! I don't know the reason.

Thanks