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pertplus
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PostPosted: Mon Dec 02, 2013 7:17 pm    Post subject: Kernel settings: core i5 760 Reply with quote

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
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PostPosted: Mon Dec 02, 2013 9:19 pm    Post subject: Re: Kernel settings: core i5 760 Reply with quote

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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PostPosted: Mon Dec 02, 2013 9:25 pm    Post subject: Re: Kernel settings: core i5 760 Reply with quote

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
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PostPosted: Mon Dec 02, 2013 10:47 pm    Post subject: Reply with quote

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
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PostPosted: Tue Dec 03, 2013 3:27 pm    Post subject: Reply with quote

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
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PostPosted: Tue Dec 03, 2013 3:35 pm    Post subject: Reply with quote

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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PostPosted: Tue Dec 03, 2013 3:35 pm    Post subject: Reply with quote

hmm I will check it out thank you
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