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pertplus
n00b
Joined: 20 Jun 2011
Posts: 40
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 Posted: Mon Dec 02, 2013 7:17 pm Post subject: Kernel settings: core i5 760 |
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Am I supposed to use Core 2/newere xeon, or just the generic 64 bit? What difference will it make?
Also, since I have 4 cores, is it correct to use the CFLAG -j5 ? Can I get away with more?
thank you in advance for replies |
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aCOSwt
Bodhisattva
Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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| Posted: Mon Dec 02, 2013 9:19 pm Post subject: Re: Kernel settings: core i5 760 |
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| pertplus wrote: | | Am I supposed to use Core 2/newere xeon, or just the generic 64 bit? What difference will it make? |
impacts on the -march / -mtune gcc options used when building the kernel.
| pertplus wrote: | | Also, since I have 4 cores, is it correct to use the CFLAG -j5 ? Can I get away with more? |
Depends on the scheduler you use. The worse the scheduler, the more you should get away with.
If using BFS, stick to -j4 with your 4 cores.
If using CFS, starts from -j5 and increase... who knows ?
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John R. Graham
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Joined: 08 Mar 2005
Posts: 10589
Location: Somewhere over Atlanta, Georgia
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| Posted: Mon Dec 02, 2013 9:25 pm Post subject: Re: Kernel settings: core i5 760 |
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| pertplus wrote: | | Am I supposed to use Core 2/newere xeon, or just the generic 64 bit? |
"Core 2/Newer Xeon" is the better choice for Core i5.
- John
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creaker
l33t
Joined: 14 Jul 2012
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| Posted: Mon Dec 02, 2013 10:47 pm Post subject: |
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if CPU supports HyperThreading:
j = (cores number * 2) +1
otherwise
j = cores number +1
In your case it is 5.
I have for similar CPU "Core 2/newer" set in config |
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pertplus
n00b
Joined: 20 Jun 2011
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| Posted: Tue Dec 03, 2013 3:27 pm Post subject: |
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thank you for the replies.
I will leave it as -j5 since I have 4 cores and no hyperthreading.
I would like to try increasing it, but realistically would I even be able to notice any difference by watching code compile? Is there some kind of tool that I could use to check efficiency on -j5 vs -j6? |
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aCOSwt
Bodhisattva
Joined: 19 Oct 2007
Posts: 2537
Location: Hilbert space
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| Posted: Tue Dec 03, 2013 3:35 pm Post subject: |
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| pertplus wrote: | | I would like to try increasing it, but realistically would I even be able to notice any difference by watching code compile? Is there some kind of tool that I could use to check efficiency on -j5 vs -j6? |
I use qlop from app-portage/portage-utils
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pertplus
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| Posted: Tue Dec 03, 2013 3:35 pm Post subject: |
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| hmm I will check it out thank you |
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Kernel & Hardware
