I looking for CPU details from solaris 10/9/8/7/6 .also I want to get cpu info for solaris zone servers.No.of Sockets,No.of Cores,No.of Cores per Socket,No.of Logical Processors(or vCPUs)
Regards,
shijo
You need to use the psrinfo command.
Related
I have two instances running on AWS (EC2). One instance is running only mongodb server while the other one is running a multi process python program that acquires info from the remote mongo server.
On the python instance I am using pymongo, and each process establishes connection (MongoClient) independently.
While monitoring the CPU utilization of the mongo's instance, I get very low CPU usage (about 2%).
In the free monitoring tool (https://cloud.mongodb.com/freemonitoring/cluster), I get about 40% CPU utilization.
Why there is such a big difference between the two values?
Does the mongodb needs to be special configured in order to utilize multiple CPU's cores?
Does the mongodb needs to be special configured in order to utilize multiple CPU's cores?
No.
Why there is such a big difference between the two values?
You have not described where the 2% value came from or what it is measuring, hence this question is impossible to answer.
i have question about KVM i could not find any satisfying answer in the net about.
Lets say i want to create 3 virtual machines on a host with 2 CPUs. I am assigning 1 cpu to 1 virtual machines. The other 2 virtual machines should be sharing 1 cpu. If it is possible i want to give 1 vm 30 % and the other one 70% of the cpu.
I know this does not make much sense but i am curious and want to test is :-)
I know that hypervisors like onapp can do that. But how do they do it?
KVM represents each virtual CPU as a thread in the host Linux system, actually as a thread in the QEMU process. So scheduling of guest VCPUs is controlled by the Linux scheduler.
On Linux, you can use taskset to force specific threads onto specific CPUs. So that will let you assign one VCPU to one physical CPU and two VCPUs to another. See, for example, https://groups.google.com/forum/#!topic/linuxkernelnewbies/qs5IiIA4xnw.
As far as controlling what percent of the CPU each VM gets, Linux has several scheduling policies available, but I'm not familiar with them. Any information you can find on how to control scheduling of Linux processes will apply to KVM.
The answers to this question may help: https://serverfault.com/questions/313333/kvm-and-virtual-to-physical-cpu-mapping. (Also that forum may be a better place for this question, since this one is intended for programming questions.)
If you search for "KVM virtual CPU scheduling" and "Linux CPU scheduling" (without the quotes), you should find plenty of additional information.
Given that a mongod process will consume quite a bit of the available RAM, is there a method to 'protect' a certain amount of RAM for the CentOS OS's use?
Or is this really even necessary from the OS's perspective...I assume like most operating systems, CentOS will take what it needs regardless.
I understand that if you are seeing this in practice, it's time to scale out/up...this is a purely theoretical question at this point as I am learning CentOS.
MongoDB doesn't manage memory. It delegates the responsibility to OS. It's beautifully explained in the below link.
MongoDB Memory Management
I was looking for an answear but didn't find one.
I'm trying to create a new VM to develop a web application. What would be the optimal processor settings?
I have i7 (6th gen) with hyperthreading.
Host OS: Windows 10. Guest OS: CentOS.
Off topic: RAM that should I give to VM should be 50% of my memory? Would it be ok? (I have 16GB RAM)
Thanks!
This is referred to as 'right-sizing' a vm, and it is dependent on the application workload that will run inside it. Ideally, you want to provide the VM with the minimum amount of resources the app requires to run correctly. "Correctly" is subjective based upon your expectations.
Inside your VM (CentOS) you can run top to see how much memory and cpu % is being used. You can also install htop which you may find friendlier than top.
RAM
If you see a low % of RAM being used, you can probably reduce what you're giving the VM. If you are seeing any swap memory used (paging to disk), you may want to increase the RAM. Start with 2GB and see how the app behaves.
CPU
You'll may want to start with no more than 2vCPUs, checkout top to see how utilized the application is under load, and then make an assessment for more/less vCPUs.
The way a hosted hypervisor (VMware Workstation) handles guest CPU usage is through a CPU scheduler. When you give a vm x number of vCPUs, the VM will need to wait till that many cores are free on the CPU to do 'work'. The more vCPUs you give it, the more difficult (slower) it will be to schedule. It's more complicated than this, but I'm trying to keep it high level. CPU scheduling deep dive.
I've setted a BOINC on my Ubuntu 12.04 Server, but it runs only 1 task at the same time.
How to set limit of tasks, running in each time?
Thanks
As stated by zero323, each tasks runs in one CPU. The default available CPU number is 1, so you will have to change this in BOINC preferences.
Go to BOINC manager > Tools > Computing preferences > Processor usage
Find On multiprocessor systems, use at most and replace the value to your desirable percentage of processors (If you want them all, use 100%. If you have a quad-core machine, you will have 4 tasks running at a time)
I also recommend you to take a look at Use at most option, since each CPU will have this percentage of usage. Keep an eye on your CPUs core temperature using the command sensors