topic thank you le g. and in Intel® Moderncode for Parallel Architectures

Haswell TSX using RTM (beginner student)

tshan_k_ — Thu, 12 Jun 2014 14:42:08 GMT

Hello,

I am just getting introduced into haswell's TSX infrastructure using RTM. I have downloaded the rtm.h header files from online and i tried producing a simple counter. Unfortunately every time i compile and run the program, the _xbegin function does not execute the transaction inside. I would be greatly appreciated for your help. thanks

#include <stdio.h>

#include <stdlib.h>

#include "rtm.h"

void main(){

int N=5;

int i;

int status;

int counter = 0;

status = _xbegin();

if (status == _XBEGIN_STARTED)

{

for (i=0; i<N ; i++) {

counter++;

printf("counter value: %d\n", counter);

}

_xend();

}

else

printf("did not work\n");

}

You should not use print

le_g_1 — Sat, 14 Jun 2014 03:07:55 GMT

You should not use print inside a transactional region. I/O is unfriendly instruction. When the transaction is aborted, the program goes to the else statement.

FWIW placing a break point

jimdempseyatthecove — Sun, 15 Jun 2014 02:17:28 GMT

FWIW placing a break point inside a transactional region will abort the transaction. Debug your code as a critical section, then convert to TSX or RTM.

Jim Dempsey

thank you le g. and

tshan_k_ — Sun, 15 Jun 2014 17:57:45 GMT

thank you le g. and jimdempseyatthecove when i put the printf function after the _xend the transaction works. thanks again for your quick help