We have an Heartbeat/DRBD/Pacemaker/KVM/Qemu/libvirt cluster consisting of two nodes. Each node runs Ubuntu 12.04 64 Bit with the following packages/versions: Kernel 3.2.0-32-generic #51-Ubuntu SMP DRBD 8.3.11 qemu-kvm 1.0+noroms-0ubuntu14.3 libvirt 0.9.13 pacemaker 1.1.7 heartbeat 3.0.5 The virtual guests are running Ubuntu 10.04 64 Bit and Ubuntu 12.04 64 Bit. We use a libvirt feature to pass the capabilities of the host CPUs to the virtual guests in order to achieve best CPU performance. Now here is [...]

I have a Server (2x Hexa-Core Xeon E5649 2.53GHz w/HT with 32GB RAM and 20000 GB Bandwidth) running Ubuntu Server 12.04 LTS. The server runs LAMP and serves one website only, the estimated number of users is to be ~ 15,000 at the same time. At the moment i have around 2000 users online each of them runs 50 MySQL queries (small values mostly select and insert) from the beginning until the end of the [...]

Here’s the output I get when I run mpstat: $mpstat Linux 3.2.0-30-generic (my-laptop-C650) 09/17/2012 _x86_64_ (2 CPU)05:32:01 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 05:32:01 PM all 9.16 0.08 2.69 2.00 0.00 0.04 0.00 0.00 86.02 And here’s what I get when I run it with a one-second interval: $mpstat 1 05:31:51 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 05:31:52 PM all 1.52 0.00 1.01 0.00 0.00 [...]

I have received an old server which has a xeon E5405 (2GHz) processor. I’d like to buy and add a more powerful cpu (something like Xeon X5492) which has a higher clock speed but the same LGA 771 socket. The aim is to improve the computational power with best bangs for bucks. So I am am wondering whether it is technically possible to mix the cpus, and, if so, is it a good idea? That [...]

Is there an easy way to check whether a certain single-threaded application is being balanced across CPU cores by Windows? I have already tried Process Explorer but I could not find a way to read it out, if possible in the first place. The reason I am wanting to know this, is because I understand that not all single-threaded applications get balanced, but rather stick to 1 core instead. Asked by Xen “Balanced” is a [...]

My named is taking ~60% CPU on both cores (2 instances of named). It is resolving ~12 domains per minute and has ~20 cached requests per domain within 5 minutes. The named cache size is 400MB. Is there anything else I forgot to do? Thank you! Asked by Vasisualiy You may have been hit by the leap second bug. Run date -s “$(date -u)” from the commandline and see if that helps. Answered by adaptr [...]

I am running MySQL on an Amazon Linux AMI. There is nothing connected to it. There are no connections and no other applications running that use MySQL. It is completely idle, but yet, top is reporting that mysql is using 62% of the CPU? Why is this happening and how do I fix it? Cpu(s): 0.2%us, 0.2%sy, 0.0%ni, 97.8%id, 0.0%wa, 0.0%hi, 0.0%si, 1.7%st Mem: 1738504k total, 390708k used, 1347796k free, 56888k buffers Swap: 917500k total, [...]

Due to some bad scripting on my part, MySQL sometimes goes haywire – taking up a lot of CPU power (load average of more then 20 – I only have 8 cores)! When I restart it is all good again. So my question is: is there a way to restart MySQL when it takes up more then 400% CPU? Preferably I would restart only the associated account(s) which cause the problem. Server: Linux with whm [...]

Due to some bad scripting one my part… mysql sometimes goes haywire – taking up alot of cpu power (severload of more then 20 – I only have 8 cores)! But when I restart it it is all good again. So my question is there a way to restart mysql when it takes up more then 400% CPU. Preferably I would restart only the associated account(s) which causes the problem. Server: Linux with whm Thanks [...]

I am evaluating the impact of additional CPUs on Oracle database performance. I am looking to license Oracle Standard Edition One (SEO, being most cost effective) or Oracle Standard Edition (SE). As per Oracle licensing terms, you can license Oracle SEO on a server with max of 2 CPUs, while the Oracle SE can be licensed on a 4 CPUs server. I am interested to know how Oracle will make use of the additional CPUs, [...]