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Questions tagged [hyperthreading]

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Running a VM on a hyperthreaded CPU

Is it better to run a VM on a dual core hyperthreaded machine as a four core or as a two core VM. The hyperthreaded 'virtual' cores are not as fast as the real cores. Does this effect the VM?
gbrandt
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What performance statistics can I use to determine if hyperthreading will improve performance?

There are several questions asking if disabling hyperthreading will improve performance (e.g. like this). The answer (as it is to all performance questions) is of course "profile it on your workload". As running experiments in a production…
dave
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Should I disable hyperthreading?

I have a large job and I'm experimenting with the topology to see what gives better results (playing with ntasks, ncores-per-cpu, nodes, etc.) I'm using slurm as my work queue manager. I have two nodes (CentOS 7, managed with Bright 7), each have…
Matt
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What can explain Hyperthreading bringing a server to its knees

In the last year I've had 2 brand new servers that I commissioned where their performance made them unusable. The both servers were Dell R620 servers with 1 processor. One had 6 cores and the other 8. One had SLES 11SP3 and Oracle, and the other…
CactusPCJack
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intel 2620 and 2609 on debian cpuinfo

I have two Boxes running Debian 7 with the following processors. Each Box has two of the same processors. Intel® Xeon® Processor E5-2620 (15M Cache, 2.00 GHz, 7.20 GT/s Intel® QPI) # of Cores 6 # of Threads 12 Intel® Xeon® Processor E5-2609 v2 …
sqwale
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how does cache work on hyperthreaded Intel Xeon Processors

I am running some experiments on a research database on EC2 using a c1.xlarge instance. As far as I can tell, the c1.xlarge uses 8 hyper-threaded virtual CPUs. Amazon also says that this instance uses a physical processor from the "Intel Xeon…
user2713719
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Hyper-V, Hyperthreading, and the implications of per-core licensing

Possible Duplicate: Hyper-V and Hyper-threading: On or off? Can you help me with my software licensing issue? I've seen lots of people saying we should turn hyperthreading on on hyper-v hosts, but I've got a dilemma. We're going to be running SQL…
Clive George
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VMware ESXi Virtual Machine configuration for hyperthreading

I have a Xeon E3-1230 processor, which has 4 physical cores, but has hyperthreading so an operating system running on it sees 8 logical cores. I installed VMware ESXi and am creating virtual machines to run on it. If I want a virtual machine to be…
Nick
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Hyperthreading on multicore processors - is it of any use?

I know hyperthreading from the time long ago where the processors used to have only a single core. The technology was really usefull then. Right now, Intel is still offering hyperthreading with 6-core processors (so they can be run in 12 threads).…
Arsen Zahray
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What have I achieved through turning on hyperthreading on an old P4?

I have an old P4 3ghz with 3gb of ram. Ive rebuilt it with Windows Server 2008 to act as my test and continuous integration machine. When I went into the BIOS to make it boot from the DVD to install Windows Server I turned on Hyperthreading. What…
Remotec
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Benefits of hyperthreading for multiprocessing?

I'm managing a compute node in a HTC cluster. The node is a 56 cores / 112 threads dual Xeon machine, and the typical workload consists of many instances of single threaded Monte Carlo simulation jobs. Benchmarks show that the throughput scales…
Nicola Mori
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Is it possible to have a partial hyperthreading with a Linux System?

I have a server with 2*14 cores with Hyperthreading enabled. This means I have (2*14*2=28*2) 56 vCPUs. [root@supervision1 /]# dmidecode -t 4 | egrep 'Socket Designation|Count' Socket Designation: SOCKET 0 Core Count: 14 Thread Count: 28 …
Manumammouth
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How to properly configure ESX VMs to use hyper threading in a usefull way?

I've a kind of specific question that I was unable to find an answer for in the official documentation of VMware or on some other very useful threads here on this platform, so here it is: I've got a host using ESX 6.0 with 2 sockets, each has 6…
Hutzi
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Identical Processor - Live Migration Error

I have production problem thats why Im asking for fast help :/ Environment 2 new HyperV Host with Windows 2016 in Failover Cluster Both with CPU: Intel® Xeon® Silver 4116 Processor 2.10 Ghz Live migration VM started on node 1 to node 2 success with…
Curl User
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Enabling Hyperthreading on a Centos 7.3 server using Intel Xeon E5620

I have a Centos 7.3 server running a dual socket quad core Intel Xeon CPU E5620 @ 2.40GHz. I would like to use hyperthreading on this server but it seems it has been disabled. The spec sheet for this chip indicates it should support…
Dave Smylie
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