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#1 2006-03-11 07:03:22

hanspr
Member
Registered: 2005-04-09
Posts: 6

How many Physical CPUs Arch Linux Supports?

How many Physical CPUs does Arch Linux Support, the traditional 2?

Can it support 4 or more Physical CPUs, How?

By Physical CPUs I take RedHat deffinition :
Red Hat defines physical CPUs equivalently to sockets, so a multi-core and/or hyperthreading CPU is counted as a single CPU or socket when determining whichedition of Enterprise Linux to deploy.

Thanks

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#2 2006-03-11 08:28:03

iBertus
Member
From: Greenville, NC
Registered: 2004-11-04
Posts: 2,228

Re: How many Physical CPUs Arch Linux Supports?

I would imagine that this is totally dependant on how the kernel is configured for a given system.

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#3 2006-03-11 08:46:34

lessthanjake
Member
From: Norway
Registered: 2005-11-09
Posts: 319
Website

Re: How many Physical CPUs Arch Linux Supports?

I think he he is thinking of the stock kernel.

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#4 2006-03-11 08:59:45

cactus
Taco Eater
From: t͈̫̹ͨa͖͕͎̱͈ͨ͆ć̥̖̝o̫̫̼s͈̭̱̞͍̃!̰
Registered: 2004-05-25
Posts: 4,622
Website

Re: How many Physical CPUs Arch Linux Supports?

Let's put it this way.
Linux can likely support more cpu's than you can afford.
wink

That is, unless you are super rich..
If that is the case..then by all means.....
....

....donate!
wink

EDIT: After some peeking around.. I found this.

SGI Altix 4700 incorporates the shared-memory NUMAflex™ architecture, which simplifies software development, workload management and system administration. It supports up to 512 processors under one instance of Linux and as much as 128TB of globally shared memory. Supporting these powerful capabilities is the NUMAlink™ interconnect, which leads the industry in bandwidth and latency for superior performance on cluster applications. The SGI Altix 4700 represents a versatile solution for shared or distributed memory applications of any scale.

Likely SGI has a few tweaks that haven't percolated into the mainline kernel yet (pending or rejected)..But sgi usually pushes the high end mutiprocessor systems..

So.. around 512?


"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍

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#5 2006-03-11 09:10:55

hanspr
Member
Registered: 2005-04-09
Posts: 6

Re: How many Physical CPUs Arch Linux Supports?

I wonder if the Linux Kernel as distributed by Arch Linux would recognize and use more than 2 CPUs or it has to be recompiled or can it be done with some configuration.
My doubt arises from the fact that RedHat specifies that some of its Enterprise versions supports up to 2 CPUs and others are not limited.
And I do not see any specifications about it on Arch Linux. And I'm facing the possibility to install Linux in a Quad CPU Box and I would like to use Arch Linux as I have done until now, would not like to move to another Distribution to so.

BTW, I already have donated :-)
and will do it again, next week.

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#6 2006-03-11 09:17:33

cactus
Taco Eater
From: t͈̫̹ͨa͖͕͎̱͈ͨ͆ć̥̖̝o̫̫̼s͈̭̱̞͍̃!̰
Registered: 2004-05-25
Posts: 4,622
Website

Re: How many Physical CPUs Arch Linux Supports?

Not sure what arch is compiled for. I would say that it should easily support 4 cpus. If needs be, a kernel recompile isn't too hard.


"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍

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#7 2006-03-11 13:01:17

T-Dawg
Forum Fellow
From: Charlotte, NC
Registered: 2005-01-29
Posts: 2,736

Re: How many Physical CPUs Arch Linux Supports?

The maximum number of CPU's the linux kernel can support is up to 255. Arch is compilied for 4.

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#8 2006-03-11 18:12:52

jaboua
Member
Registered: 2005-11-05
Posts: 634

Re: How many Physical CPUs Arch Linux Supports?

Penguin wrote:

The maximum number of CPU's the linux kernel can support is up to 255. Arch is compilied for 4.

A few months ago I read that NASA is building a supercomputer with over 10 000 CPU's which would run linux?

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#9 2006-03-11 21:50:06

MAC!EK
Member
Registered: 2005-09-27
Posts: 267

Re: How many Physical CPUs Arch Linux Supports?

jaboua wrote:
Penguin wrote:

The maximum number of CPU's the linux kernel can support is up to 255. Arch is compilied for 4.

A few months ago I read that NASA is building a supercomputer with over 10 000 CPU's which would run linux?

I think they have so many good coder that the will manage to increase the numer of CPUs supported :>

$ grep CPUS /boot/kconfig26
# CONFIG_CPUSETS is not set
CONFIG_NR_CPUS=4
CONFIG_SPLIT_PTLOCK_CPUS=4

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#10 2006-03-11 23:23:12

_Gandalf_
Member
Registered: 2006-01-12
Posts: 735

Re: How many Physical CPUs Arch Linux Supports?

and

[wael@nasreddine ~]$ grep CPUS /boot/kconfig26archck
# CONFIG_CPUSETS is not set
CONFIG_NR_CPUS=8
CONFIG_SPLIT_PTLOCK_CPUS=4

smile

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