[lfs-support] Do you know why 2 CPUs act like a mirror in GCC test?
Hi, Sorry if it's off-topic; do you know why 2 CPUs act like a mirror while I'm running make -k check for testing GCC-4.6.2 (6.17's section of LFS-7.1)? it's not a problem but just I would like to know; I've attached an image which shows this while I was not running anything except GCC testing and Debian's System Monitor. I think it'll be an interesting reason that causes 2 CPU's mirror action during all test process! Thanks! -Yasser attachment: GCCTest.gif-- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: [lfs-support] Do you know why 2 CPUs act like a mirror in GCC test?
On Sat, 12 May 2012 21:11:19 +0430 Yasser Zamani yasser.zam...@live.com wrote: Hi, Sorry if it's off-topic; do you know why 2 CPUs act like a mirror while I'm running make -k check for testing GCC-4.6.2 (6.17's section of LFS-7.1)? it's not a problem but just I would like to know; I've attached an image which shows this while I was not running anything except GCC testing and Debian's System Monitor. I think it'll be an interesting reason that causes 2 CPU's mirror action during all test process! Thanks! -Yasser Probably make is running only one process at a time and Linux load-balances the cores in that it dispatches them in an alternating fashion. Try running make -j2 -k check to make make run two jobs at the same time. -- Fourth law of programming: Anything that can go wrong wi sendmail: segmentation violation - core dumped -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
Re: [lfs-support] Do you know why 2 CPUs act like a mirror in GCC test?
Date: Sat, 12 May 2012 19:01:51 +0200 From: akuk...@gmail.com To: lfs-support@linuxfromscratch.org Subject: Re: [lfs-support] Do you know why 2 CPUs act like a mirror in GCC test? On Sat, 12 May 2012 21:11:19 +0430 Yasser Zamani yasser.zam...@live.com wrote: Hi, Sorry if it's off-topic; do you know why 2 CPUs act like a mirror while I'm running make -k check for testing GCC-4.6.2 (6.17's section of LFS-7.1)? it's not a problem but just I would like to know; I've attached an image which shows this while I was not running anything except GCC testing and Debian's System Monitor. I think it'll be an interesting reason that causes 2 CPU's mirror action during all test process! Thanks! -Yasser Probably make is running only one process at a time and Linux load-balances the cores in that it dispatches them in an alternating fashion. Try running make -j2 -k check to make make run two jobs at the same time. Yes, I think you're right. for compilation I always used -j2 switch but unfortunately I did not know that I can use this switch with any 'make ' command! I remember when I used this switch for compilation, both CPUs was on 100% load. thanks again, I learned that I can issue 'make check' with -j2 switch too and waiting less and mailing less as result ;) -Yasser -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
