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Processor utilization

post #1 of 13
11/12/12 at 11:37am
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I'm compiling the latest Qt SDK, and thought I'd check out system monitor. It appears the four cores on my i5 are being utilized, but they seem to be alternating processing time. Does that look right?

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post #2 of 13
11/12/12 at 11:42am
Yeah it looks like the compile process is hopping between cores. Can you alter the number of of compile jobs? As a rough guide, I treat a HyperThread as half a core, so assuming your i5 has HT, 4 cores + HT effectively equals 6 un-threaded cores. See if you can raise the number of make jobs to 7 - this will keep the cores busy.
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post #3 of 13
11/12/12 at 12:24pm
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Quote:
Originally Posted by parityboy View Post

Yeah it looks like the compile process is hopping between cores. Can you alter the number of of compile jobs? As a rough guide, I treat a HyperThread as half a core, so assuming your i5 has HT, 4 cores + HT effectively equals 6 un-threaded cores. See if you can raise the number of make jobs to 7 - this will keep the cores busy.

i5s don't have HT. thats i7s. the laptop ones do but then that would be 3 because the laptops have 2 cores.
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post #4 of 13
11/12/12 at 1:09pm
Ahhh, ok. I get confused with what Intel is doing these days. tongue.gif OK then, set the number of compile jobs to 5 and see what happens. I used to do something similar when I was running Gentoo on a dual-PIII rig back in the good ol' days. biggrin.gif
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post #5 of 13
11/12/12 at 1:25pm
  • Shrak
  • (╯°□°）╯︵ ┻━┻
I've always used Threads + 1 myself tongue.gif
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post #6 of 13
11/12/12 at 5:59pm
Thread Starter 
I recall setting the number of compile threads when I was playing with Gentoo, but how do I go about that, say, in Fedora 17? Probably similar to about any other distro, but I'm still learning the Linux ropes. redface.gif
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post #7 of 13
11/12/12 at 8:09pm
Quote:
Originally Posted by Quasimojo View Post

I recall setting the number of compile threads when I was playing with Gentoo, but how do I go about that, say, in Fedora 17? Probably similar to about any other distro, but I'm still learning the Linux ropes. redface.gif

The "j" or jobs flag for make is what you are looking for. Since you are in Fedora 17, you will be using `make -j5` for your i5, (4+1) I don't remember how to do it with cmake.
In gentoo you configured portage's makeflags to "j(x)" and in Arch you would set your makepkg.conf to have makeflags as well. You can set global default makeflags, but this practice is generally not reccomended as some makeflags (even the jobs flag) can produce broken executables under certain circumstances.

That said, I will go on a limb and say you will never run into the "j" flag breaking anything; you can use ~/.bashrc someone correct me if I'm wrong please.

and add MAKEFLAGS="-j5" which should globally change the make flags
You can enable processor specific optimizations for GCC with:
CFLAGS="-march=native"
and
CXXFLAGS="-march=native"

You make want to echo the CFLAGS and CXXFLAGS variables before setting them to the above as flags like O2 and pipe may be enabled already, in which case you may want to copy them over; you can undo the override by commenting out or removing the lines and rebooting, as they are probably set elsewhere as well, and ~/.bashrc will just override them when you login to this user.

The corei7-avx is for you because you have a post Sandy Bridge processor with AVX extensions. I wrongfully suggested this; GCC4.2 added dynamic processor detection via -march=native, which enables -march and -mtune as -m(is) flag detection at build time, when appropriate.
Edited by Xaero252 - 11/12/12 at 8:26pm
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post #8 of 13
11/12/12 at 8:23pm
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Quote:
Originally Posted by jrl1357 View Post

Quote:
Originally Posted by parityboy View Post

Yeah it looks like the compile process is hopping between cores. Can you alter the number of of compile jobs? As a rough guide, I treat a HyperThread as half a core, so assuming your i5 has HT, 4 cores + HT effectively equals 6 un-threaded cores. See if you can raise the number of make jobs to 7 - this will keep the cores busy.

i5s don't have HT. thats i7s. the laptop ones do but then that would be 3 because the laptops have 2 cores.

First gen i5-6xx chips have HT; 2c/4t*
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post #9 of 13
11/12/12 at 8:40pm
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Quote:
Originally Posted by PR-Imagery View Post

Quote:
Originally Posted by jrl1357 View Post

Quote:
Originally Posted by parityboy View Post

Yeah it looks like the compile process is hopping between cores. Can you alter the number of of compile jobs? As a rough guide, I treat a HyperThread as half a core, so assuming your i5 has HT, 4 cores + HT effectively equals 6 un-threaded cores. See if you can raise the number of make jobs to 7 - this will keep the cores busy.

i5s don't have HT. thats i7s. the laptop ones do but then that would be 3 because the laptops have 2 cores.

First gen i5-6xx chips have HT; 2c/4t*

still, 3t
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post #10 of 13
11/13/12 at 1:28pm
by default, compiling is confined to one core. There are command line switches to enable support for more threads, but this can potentially cause issue with linking (doesn't always, but has been known).
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