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1answer
270 views

Java doesn't seem to utilize more than two cpus

In my current setup (debian squeeze x64, 6 cpus) neither java nor apache seem to utilitze the full potential of the server. The munin monitoring shows cpu usage never exceeds the 200% mark. We ran ...
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2answers
2k views

How to make the most of JBOSS in multicore environments

I'm deploying jboss in a multicore system, where I'll have from 12 to 20 cores, and when I run the jboss server, I only see 1 process running, and I feel like it won't use more than one core... Is ...
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2answers
536 views

Two Xeon Processors with Different Clock Speeds on the Same Motherboard: Possible?

If I have a 2.0gHz Woodcrest 5130 Xeon and a 1.6gHz Woodcrest 5110 Xeon, can I put them both on the same motherboard? The machine in question is a PowerEdge 2950.
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2answers
30 views

Why limit execution cores if you're not an cloud provider

We're maintaining development of a system installed at a customer site on their virtual server. This application will at times need to run heavy work. However it's only been granted a single core. I ...
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2answers
681 views

Hyperthreading on multicore processors - is it of any use? [closed]

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 ...
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1answer
184 views

Should a core be “reserved” for the OS in a multi-core (SMP) Linux system?

If I plan to run eight applications on an eight core machine and expect all applications to utilise 100% cpu, will the OS "get enough time" for its own tasks or should I instead run seven applications ...
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1answer
1k views

Does installing more CPUs (Intel) than indicated by “Max CPU Configuration” prevent all cores from being used?

I am looking at a server that has 4 physical processors, the Intel documentation indicates they are 6 core processors but this WMI query WMIC CPU Get NumberOfCores, NumberOfLogicalProcessors /Format:...
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2answers
3k views

VMware - Can a 1 vCPU VM use more than 1 physical core at the same time?

Assume I have a physical ESX host with ONE quad-core processor and hyper-threading disabled. This means it has a total of 4 physical cores or pCPUs. I create a single VM on this VMware host. I assign ...
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1answer
344 views

KVM host only using one core out of 8

This KVM host is only running one VM/guest right now, and it is running with -smp 1. Top shows only the first core being active. Is that expected when using -smp1? The guest OS is Windows XP. The ...
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1answer
2k views

MySQL MyISAM multi-core optimization

I've noticed that our app does not respond to requests when a demanding request is in execution. Running top seems to identify the source of the problem: top - 13:54:25 up 1 day, 13:43, 2 users, ...
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1answer
72 views

Red Hat AS 64-bit and multi core chip recognition

We're running RH AS 64-bit 4.6 and for some reason after installing a Hitachi SAN driver, the kernal only recognizes 1 CPU of the 8 (4 dual core Opterons). This server hosts an Oracle 9i database, so ...
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1answer
768 views

Quad Core but Single Core on task manager

ACPI Multiprocessor -> Check 4 Processor shown on Device Manager -> Check 4 Processor shown on Task Manager -> Nope OS -> Windows 2003 Enterprise 32Bit Should I see four processers on the Task ...
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1answer
2k views

Nginx worker_processes and multi core cpu's - Do Hyper-threading cores count?

Quite often, when reading about the recommended worker_processes for nginx it is stated that this should be set to the numbers of cores the server hosting nginx has. We were wondering if we should ...
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1answer
388 views

If SMP is disabled, does that mean I cannot use multicores? Or multiprocessors?

I've purchased a VPS for the sake of dev work, and had wished to install NetBSD under the Xen DomU guest. Unfortunately it is stated that this will work, however will not support SMP. Does this mean ...
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3answers
953 views

mpstat not showing all CPUs on CentOS 5.5 (64 bit)

I have two Quad Core XEON processors. When I run "mpstat" then it just shows combine figure of all CPUs like this: 12:16:44 AM CPU %user %nice %sys %iowait %irq %soft %steal %idle ...
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3answers
3k views

How to get Windows Server 2008 VM to use multiple cores

I have a Windows Server 2008 machine running in VirtualBox. On initial installation, only one processor was made available, but now I want to run it as a multiprocessor machine. I have made all four ...
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2answers
681 views

SQL Server 2005 preferring a single core per cpu?

HI folks, I've a SQL Server 2005 system, with 4 cpus in it each with 4 cores. It's currently mainly utilising just 4 cores, ie 4 hover around 90% utilisation at peak and the others closer to 30%. I'm ...
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0answers
22 views

Dell 2970 Server dual Opteron 2435's_Ubuntu OS incorrectly reporting CPU's

The 2970 has BIOS version 4.2.1. lshw -c processor gives me correct cpu information and core count = 12 cores. cat /proc/cpuinfo and lscpu both give me 8 cores (incorrect). OS = Ubuntu 14.04 LTS I had ...
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1answer
1k views

AIX CPU Utilization behavior

We are facing a strange (for us) situation regarding the CPU utilization management. We have an lpar with 2 up to 4 online cores. While the application workload peaks, CPU usage is 100% (70% user + 30%...
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0answers
482 views

making use of multiple cores with autobench/httperf

I would like to benchmark a powerfull webcluster with autobench. The problem is that autobench (which uses httperf) can only use one core, thus limiting the amount of load that a client can put on the ...
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2answers
109 views

Assigning cores to VM in vSphere

Complete vSphere newbie here... Background: So, I have a 12 core machine with 24 VMs on it. Currently, all the processing power is shared between these VMs equally. The question: Can I configure ...
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4answers
931 views

Free alternative to NI Real-Time Hypervisor?

Is there an free alternative to National Instruments' NI Real-Time Hypervisor? National Instruments provides both a Windows and Linux versions.
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2answers
158 views

Running multiple copies of the script - using cores or simply slowing the server down?

I have a small compact PHP script that monitors a beanstalk message queue on a CentOS 5 server. When it gets a message, it starts to undertake a particular action and once complete, goes back to the ...
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2answers
177 views

SQL server availability issue: large query stops other connections from connecting

I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the ...
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3answers
407 views

Linux: One cpu core is always in 0 use

Today I notice a very strange thing. One cpu core is always in 0 use . Is it a bug? Cpu0 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi,100.0%si, 0.0%st Cpu1 : 37.7%us, 44.4%sy, 0.0%ni, ...
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4answers
1k views

Web- and DB-Server: High clock rate and less cores vs. less clock rate and many cores

I am currently looking into setting up a new infrastructure for a hosting project of mine. Basically it will be managed hosting with a strong focus on Django-based apps. All will be Linux-based of ...
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3answers
739 views

2 x Dual Core vs 1 x Quad Core Performance

A license restriction limits us to 2 x dual core servers, or one 1 x quad core server. Should we see better performance running 2 x Dual Core servers or 1 x Quad Core? Dual Core processors are ...
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4answers
2k views

How to force a process to run on a particular cpu?

I know that taskset can be used to force a process to run on a particular cpu. How can I force tomcat to run on a particular CPU? I then want to run apache bench on a seperate CPU. Update I ...
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2answers
420 views

Util. to tell me how many cores are being used under Win 2003 Standard

Confusion reigns about licensing, with the No. of processors that can be engaged by various versions of 2003/ 2008 server. Now that we have 6 core AMDs and future 8 core Intels, I wonder if hardware ...
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1answer
26 views

Apache doesnt appear to be using multiple cores

I have a dedicated server with 16gb RAM with a Xeon E5504(8cores @2.0GHZ) running with Centos 7. I ran the top command and can see that 7 of the cores are close to idle most of the time and then one ...
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2answers
898 views

Multicore license: ESX Vs Citrix Xenserver [duplicate]

Possible Duplicate: Can you help me with my software licensing question? VMware ESX is free for upto 6 cores per CPU only Vsphere Advanced version is required for 12 CPU cores does Xenserver ...
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2answers
361 views

Is Pentium D915 plug compatible with Core 2 Quad?

I have a system: dual core pentium d 915 currently running at 2.8GHz with 2GB DDR2. I wish to upgrade it to be used as an application server. I wish to upgrade the processor and ram to 4GB. ...
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2answers
3k views

CPU Utilization of a multithreaded process

Background: I have a whole mess of systems running the 2.6.20 and 2.6.22 kernel in what started as a Fedora Core 2 install several years ago. These systems have 8 cpus, as reported by cat /proc/...
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1answer
754 views

Hardware virtualization support for Core i7 + P55

I'm considering a hardware upgrade from AMD Opteron 1216 to a Core i7 920 or Core i7 860. I want to know if Hardware Virtualization (VT-X) is supported? I found the spec sheets online which say yes. ...
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2answers
108 views

how to check if a process with heavy io usage is running properly

I am now managing a computer cluster for scientific computing. Some processes in the cluster need heavy io usage. Now I find such a process: Its state changes rapidly between DOWN and RUN and its ...
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1answer
218 views

Taskset not working properly in OpenVZ container

In a Debian OpenVZ container, I'm trying to use taskset to pin a process to a core, but it doesn't work: root@foo:/# taskset -c -p 0 1754 pid 1754's current affinity list: 0-7 pid 1754's new affinity ...
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4answers
272 views

Does using all cores reduce efficiency?

I have a program (well, php script) which does some pretty heavy text searching - it loads a 2mb and 40mb file and searches through them to find where each word that appears in the first is present in ...
0
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1answer
297 views

Windows Server 2012 - CPU utilization

I have Windows Server 2012 machine which has 32 cores. In Task Manager, it shows 32 cores and 64 logical processors, because of hyperthreading. My CPU utilization is in the screenshot below: Can ...
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1answer
224 views

On Multiple Processors sytem, System load is high while most of CPUS are idle

See the following output of "top". Any idea? top - 17:33:25 up 7 days, 28 min, 4 users, load average: 12.04, 8.35, 6.30 Tasks: 477 total, 2 running, 474 sleeping, 0 stopped, 1 zombie Cpu0 :...
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2answers
666 views

How many cores are available in this case?

We're managing 2 production server. One is RHEL4 and other one is CentOS5. In order to find the load average, I need to determine how many cores the server has got. I used the command $ grep cores /...
0
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1answer
125 views

Single server investment for MPI and GridGain

Our department has $16k to buy computer hardware for high performance computation. The purpose is to do simulation and data analysis using multithreaded applications written with MPI or GridGain, so ...
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1answer
589 views

Q8300 Core-2 Quad vs X3360 Xeon

I'm looking at this ABMX server, and trying to decide on the CPU. I'm purchasing 2 servers, to be used as dedicated web and DB servers for a web site that has low traffic now but could ramp up ...
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0answers
55 views

Google Compute Engine Poor Multi Core Performance

I am trying to move a simulation from a dedicated i7-4770 machine to Google Compute Engine. The problem being simulated is naturally parallel, with each thread in the simulation executing an ...
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0answers
178 views

Dual core CPUs stall with Docker on Ubuntu Linux

I have seen performance degradation after half an hour to one hour with machines running Celery (Django/Python), or Storm under Docker containers with Ubuntu base on Dual-core CPUs on AWS. I see ...
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1answer
747 views

Tomcat performing terribly for no apparent reason

We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages ...
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2answers
103 views

CPU core utilization is automatic?

I have a 512MB KVM Debian OS VPS running several game servers and several sql enabled websites. Currently I have 1 vCPU core and it stays around 15% usage. If I were to get an extra vCPU core will ...
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2answers
84 views

Multi-CPU server with CPUs of differing core counts

Is it possible to have a multi-CPU server where the CPUs do not necessarily have the same number of core counts? For example, a group of 4 at dual core and a group of four at quad core? This ...
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1answer
55 views

number of cores available on a server

I need to find out, how many cores are available on a server at that moment. For example, it is a 8 core machine and running at 50% CPU utilization. Can this be assumed as 4 cores are available? or is ...
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1answer
23 views

Tasks on server stay in sleeping

I logged into a server with multiprocessors and started 20 python programs, each processing part of my data. However, it cost too much time so I checked top and found all ipython processes are in ...
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1answer
337 views

Can I improve speed in Hyper-V?

I use Windows Server 2008 R2 (it is host) with Hyper-V and a guest running Ubuntu 12.04 LTC. It is my settings: RAM 32768 Cores (virtual processes) 4. (I need 12) I also use virtual hard drive ...