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E Arredondo
*nix forums beginner
Joined: 18 Mar 2005
Posts: 24
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 Posted: Wed Aug 17, 2005 9:02 pm Post subject:
PowerEDge 2800
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Which configuration will run faster if I have a DEll Poweredge2800 with DUAL
Xeon's 2.8 CPUs ?
Leave the LOGIC CPU DISABLED ----------> Red Hat detects 2 cpus
Leave the LOGIC CPU ENABLED ----------> RH detects 4 cpus
I know that if you split a CPU it will perform slower , that is 1/2 CPU =
1.4 Ghz. So which is other words which is better to have 2 CPUS running at
2.8 ghz or 4 CPUs running at 1.4 ghz ?
Does my question makes sense ?
Thanks |
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ray
*nix forums Guru
Joined: 20 Feb 2005
Posts: 1127
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| Posted: Thu Aug 18, 2005 2:09 am Post subject:
Re: PowerEDge 2800
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On Wed, 17 Aug 2005 23:02:03 +0000, E Arredondo wrote:
| Quote: | Which configuration will run faster if I have a DEll Poweredge2800 with DUAL
Xeon's 2.8 CPUs ?
Leave the LOGIC CPU DISABLED ----------> Red Hat detects 2 cpus
Leave the LOGIC CPU ENABLED ----------> RH detects 4 cpus
I know that if you split a CPU it will perform slower , that is 1/2 CPU =
1.4 Ghz. So which is other words which is better to have 2 CPUS running at
2.8 ghz or 4 CPUs running at 1.4 ghz ?
Does my question makes sense ?
Thanks
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I believe what you are talking about is hyperthreading. In my
understanding the hyperthreaded CPU runs as approximately 1.5 full speed
CPUs. Whether or not you can actually make use of two physical CPU's or
four logical CPU's depends on what you are doing. If you are running
compute bound processes which are parallelized to be able to run parallel
threads then it is beneficial. If you are running several independent
tasks it will also be beneficial. If you are running one compute intensive
process at a time and it is not parallelized, then you won't see any gain
(except that other processes run at the same time will not be slowed
down). And, of course, you need to be running an SMP kernel to begin with. |
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E Arredondo
*nix forums beginner
Joined: 18 Mar 2005
Posts: 24
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| Posted: Thu Aug 18, 2005 4:44 pm Post subject:
Re: PowerEDge 2800
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"ray" <ray@zianet.com> wrote in message
news:pan.2005.08.18.04.09.09.47455@zianet.com...
| Quote: | On Wed, 17 Aug 2005 23:02:03 +0000, E Arredondo wrote:
Which configuration will run faster if I have a DEll Poweredge2800 with
DUAL
Xeon's 2.8 CPUs ?
Leave the LOGIC CPU DISABLED ----------> Red Hat detects 2 cpus
Leave the LOGIC CPU ENABLED ----------> RH detects 4 cpus
I know that if you split a CPU it will perform slower , that is 1/2 CPU =
1.4 Ghz. So which is other words which is better to have 2 CPUS running
at
2.8 ghz or 4 CPUs running at 1.4 ghz ?
Does my question makes sense ?
Thanks
I believe what you are talking about is hyperthreading. In my
understanding the hyperthreaded CPU runs as approximately 1.5 full speed
CPUs. Whether or not you can actually make use of two physical CPU's or
four logical CPU's depends on what you are doing. If you are running
compute bound processes which are parallelized to be able to run parallel
threads then it is beneficial. If you are running several independent
tasks it will also be beneficial. If you are running one compute intensive
process at a time and it is not parallelized, then you won't see any gain
(except that other processes run at the same time will not be slowed
down). And, of course, you need to be running an SMP kernel to begin with.
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Thanks! |
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ray
*nix forums Guru
Joined: 20 Feb 2005
Posts: 1127
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| Posted: Thu Aug 18, 2005 6:51 pm Post subject:
Re: PowerEDge 2800
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Sure - I hope that information helps. |
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