https://community.intel.com/t5/Intel-Moderncode-for-Parallel/New-test/m-p/977778#M5645 <DIV>I ran the program you sent and the output was:</DIV> <DIV></DIV> <DIV>Hello from thread 0</DIV> <DIV>0 0</DIV> <DIV>1 0</DIV> <DIV>2 0</DIV> <DIV>3 0</DIV> <DIV>4 0</DIV> <DIV>5 0</DIV> <DIV>6 0</DIV> <DIV>7 0</DIV> <DIV></DIV> <DIV>At this point it hung, so once again the second thread simply never got started. When I set OMP_NUM_THREADS to 1 the program ran fine with one thread outputting all the numbers correctly. When I set it to 2 the program hung at the point I indicated.</DIV> <DIV></DIV> <DIV>Even more strangely, it worked once. I tried it and it hung. Then I tried it again (this time redirecting the output to a file) and it worked, correctly printing hello from both threads and printing all 16 outputs. I then tried it several times more, sometimes outputting to the console and sometimes redirecting the output to a file, and I could never get it to work again.</DIV> <DIV></DIV> <DIV>You asked if it works with hyperthreading disabled. How do I disable hyperthreading under Linux?</DIV> <DIV></DIV> <DIV>If you'd like I'd be happy to give you access to a user account on the machine I'm doing this on. We would just have to figure out a secure way for me to send you the username and password. (Phone?)</DIV> <DIV></DIV> <DIV>Thanks again for your help,</DIV> <DIV>Gary</DIV> <DIV></DIV> <DIV>P.S. - My Internet connectivity will be spotty over the holidays, but I'll be checking the board at least once a week and I'll be back in more regular contact shortly after New Year's.</DIV> Sat, 20 Dec 2003 07:27:43 GMT gfelder 2003-12-20T07:27:43Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/New-test/m-p/977778#M5645 <DIV>I ran the program you sent and the output was:</DIV> <DIV></DIV> <DIV>Hello from thread 0</DIV> <DIV>0 0</DIV> <DIV>1 0</DIV> <DIV>2 0</DIV> <DIV>3 0</DIV> <DIV>4 0</DIV> <DIV>5 0</DIV> <DIV>6 0</DIV> <DIV>7 0</DIV> <DIV></DIV> <DIV>At this point it hung, so once again the second thread simply never got started. When I set OMP_NUM_THREADS to 1 the program ran fine with one thread outputting all the numbers correctly. When I set it to 2 the program hung at the point I indicated.</DIV> <DIV></DIV> <DIV>Even more strangely, it worked once. I tried it and it hung. Then I tried it again (this time redirecting the output to a file) and it worked, correctly printing hello from both threads and printing all 16 outputs. I then tried it several times more, sometimes outputting to the console and sometimes redirecting the output to a file, and I could never get it to work again.</DIV> <DIV></DIV> <DIV>You asked if it works with hyperthreading disabled. How do I disable hyperthreading under Linux?</DIV> <DIV></DIV> <DIV>If you'd like I'd be happy to give you access to a user account on the machine I'm doing this on. We would just have to figure out a secure way for me to send you the username and password. (Phone?)</DIV> <DIV></DIV> <DIV>Thanks again for your help,</DIV> <DIV>Gary</DIV> <DIV></DIV> <DIV>P.S. - My Internet connectivity will be spotty over the holidays, but I'll be checking the board at least once a week and I'll be back in more regular contact shortly after New Year's.</DIV> Sat, 20 Dec 2003 07:27:43 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/New-test/m-p/977778#M5645 gfelder 2003-12-20T07:27:43Z https://community.intel.com/t5/Intel-Moderncode-for-Parallel/New-test/m-p/977779#M5646 <DIV></DIV> <DIV></DIV> <DIV>Thanks for running the test program. It's pretty clear that the second thread either isn't created or the program somehow exits before the second thread starts. I'm at a loss as to how either of these possibilities could occur. I can't reproduce the problem on any of my lab systems.</DIV> <DIV></DIV> <DIV>We need to involve the compiler team at this point. I can think of a few more things for you to try but they won't getyou any closer to a solution. Please submit this issue to <A href="http://www.intel.com/software/products/support/#premier" target="_blank">Premier Support</A>. Their support engineers are better suited to working this issue with the compiler developers.</DIV> <DIV></DIV> <DIV>Best regards,</DIV> <DIV>Henry</DIV> <DIV></DIV> <DIV>PS You can <EM>usually </EM>enable or disable Hyper-Threading in the BIOS.</DIV> <DIV></DIV> Sat, 20 Dec 2003 08:01:45 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/New-test/m-p/977779#M5646 Henry_G_Intel 2003-12-20T08:01:45Z