Speed up fprintf or fwrite

hakeen

Other Parts Discussed in Thread: OMAP-L137

I'm developing on OMAP-L137

I have short_array[80000]. Have to export short_array to file and check in excel.

So, I use fprintf to write short_array to file.

But the write speed is very slow (22 seconds, write 10000 rows)

i tried several way to speed up.

Method A: setvbuf to set large buffer

setvbuf ( pFile , buf, _IOFBF , sizeof(buf) );

Method B; fwrite with large buffer

fwrite( buf, 1, strlen( buf ), pFile );

The above two methods can't speed up writing file.

Please advise other ways. Thanks a lot!

0 Pubesh over 11 years ago

Hakeen,

These are C standard I/O functions, refer this wiki page for better understand and how to use it.
http://processors.wiki.ti.com/index.php/Tips_for_using_printf

0 hakeen over 11 years ago in reply to Pubesh

Thanks!

I did read this wiki.

Heap , Stack , .cio , setvbuf won't improve speed.

This wiki could help to reduce "print code size".

I think the bottleneck is "how CCS and EVM write file" ?

When I execute "fprintf" , CCS fetch memory value from EVM and write to PC's file.

Is there any way to improve above flow?

0 Pubesh over 11 years ago in reply to hakeen

Hakeen,

If you are using emulator on board when write or read sequence, please see this thread.
http://e2e.ti.com/support/development_tools/code_composer_studio/f/81/t/3564.aspx

0 hakeen over 11 years ago in reply to Pubesh

Thanks!

It should be CCS limitation. CCS fetch memory value from EVM can't be speed up......

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