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1answer
135 views

Alternative system fans for EOL HP ML150 G6 servers

Background I have an HP ML150 G6 server that HP made 'End Of Life'. I added a second processor to the system but then was unable to get past POST due to a missing system fan. I found a diagram that ...
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0answers
257 views

Server crash : “unable to handle kernel paging request”

My fresh new Ubuntu webserver randomly crashes with the following error in the syslog. It doesn't respond anymore and I have to do a hard reboot. It happens almost one time a day. Server kernel is : ...
7
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3answers
349 views

Enable SMP on Debian i386?

I've been running a couple old HP machines on Debian for a while, and only recently noticed that they were only 'recognizing' and using one processor. cat /proc/cpuinfo only shows output for processor ...
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3answers
323 views

Linux SMP Kernel Ram Utilization

I have a linux machine with Redhat 32 bit SMP Kernel installed , the ram size of machine is 16 GB and processor architecture is 64 bit. Please clarify my doubts on this setup : Can OS use the 16GB ...
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3answers
2k views

Execute curl requests in parallel in bash

What is the best way to execute 5 curl requests in parallel from a bash script? I can't run them in serial for performance reasons.
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2answers
2k views

How to change SMP affinity of an IRQ on Ubuntu PV domU inside Xen XCP?

I'd like to change IRQ SMP affinity for reasons, outlined in this question: CPU0 is swamped with eth1 interrupts But I can't — I see Input/output error when I try to write to ...
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1answer
243 views

linux kernel soft lock nagios

I've had this happen a few times in the past few days, anyone have any idea what might be causing this? Looks related to nagios/smp/memory management. Seems to be recurring every 24hrs or so. This is ...
1
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1answer
180 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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1answer
181 views

Is one Xeon core enough to run a general website on my VPS?

I've purchased a VPS for dev work (at Linode) some time ago and am wishing to install NetBSD for the sake of experience, however its current support under the Xen hypervisor does not allow for SMP. I ...
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2answers
590 views

ESXi performance considerations with VM that requires many CPUs

I will be looking to buy a new server soon, and would like to consolidate servers into one VM server. I will have equivalent infrastructure offset, so this isn't a case of having all my eggs in one ...
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2answers
2k views

Multiple vCPUs or multiple identical VMs, which is better?

I am looking to upgrade one of our servers, an 8 core server running VMware Server 2. The VMs it runs are mostly web, file, and email servers; specifically, it runs three webservers, 2 email/file ...
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2answers
2k views

Is it possible to tell which cpus are hyperthreads of the same core?

I have a server that is a quad-core i-7 with hyperthreading enabled. The kernel recognises this as 8 cpus, as it should. I want to create a couple virtual hosts running on this machine. virt-manager ...
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3answers
679 views

VMWare ESXi and IRQ balancing

VMWare ESXi 4.1 Guest: Linux kernel 2.6.32 64bit (tried older as well) In multi-CPU virtual machine all interrupts (eth0,ata_piix) are stuck to the single CPU. When running on the pure hardware, ...
0
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1answer
158 views

Why windows process scheduler assign tasks to random CPUs?

I am on dual core C2D processor, Windows 7 (although this behavior is the same in all MS OSes I've seen). When I run any single threaded CPU-intensive task, it does not stick to 1 core, but rather ...
0
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1answer
366 views

Does FreeBSD suffer from SMP issues?

This is not a FreeBSD vs [insert favorite linux server distro]. My interest is in knowing the why and how to remedy sch issues if they exist. Primarily, I'm looking to implement a FreeSwitch based ...
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3answers
186 views

24 Core LAMP Issue

I have a 24 Core Opteron 8435 system with 48GB of RAM. However, the performance is way below that of our 6 Core Intel with 30GB of RAM. I wonder if anyone could this of why? We're running a Drupal ...
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6answers
808 views

24 Core Server Performance

I have a quad hexacore system based on the Opteron 8345 chips - that's 24 cores in all with 48GB of ram. This box was meant to replace the current six Intel core box which my current LAMP stack runs ...
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3answers
524 views

Emulate a SMP server with a Linux Cluster?

Is it possible to combine a few machines into a cluster and have it appears as a single server? For example, with such a cluster we can run a 32-thread CPU-bound process on 8 quad-core machines. Are ...
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4answers
145 views

How to know when the kernel was last compiled?

I have installed a linux distro and I "think" it is vulnerable to kernel exploits. I have to update kernel but I need to know if it is really compiled in year 2003? How can I know if additional ...
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1answer
159 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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3answers
8k views

How can I tell if irqbalance is doing anything?

I've looked into linux server tuning docs that mention installing irqbalance (http://www.irqbalance.org/) on SMP systems. I'm looking at it now on a quad-core system, and while "ps axf" can tell me ...
2
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3answers
806 views

Will multiple processors show in /proc/cpuinfo on a kernel that doesn't have SMP enabled?

I have recently migrated an application from one server to another and am having some issues I am wondering if they are associated to HyperThreading. In regards to my question, I currently don't have ...
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5answers
2k views

Why is CPU use so asymmetric on our 8-cpu SQL Server box?

I've noticed that the CPU usage on our 8-CPU database server, running SQL Server 2008, is not balanced at all. Here are the 1 day averages for a random day a while back, which is typical and ...
2
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3answers
119 views

Best hardware/software solution for parallel makes?

We've got a Linux-based build system in which a build consists of many different embedded targets (with correspondingly different drivers and featuresets enabled), each one built with another single ...
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5answers
1k views

How can I emulate more virtual CPU than physically available?

In VMWare you can use multiple CPU, but only as much as present on the host. Is there a way to use more CPU than physically available ? It would be to : test software designed to run on an ...