I'm running a database server that's under moderately heavy load. I just kicked off xcopy on that box to copy a database backup to a remote server.
I see that xcopy is using almost all my available bandwidth. I'm worried that it will hog bandwidth that the database would otherwise use.
If I lower xcopy's priority in taskmgr, will that de-prioritize the network traffic, or just CPU time?
I am transitioning from Xen to KVM, and will be using Fedora 14. I plan to use cgroups to assign priorities to VMs.
My question is as follows: If I place VMs in various cgroups, should I also put all other Domain-0 (physical host) processes in a single cgroup, which I would then assign lower priority? The analogy for Xen would be that all Dom0 processes are batch scheduled when the Dom0 "VM" is scheduled, so by placing them all in the same cgroup, I would be emulating this behavior. However, since KVM doesn't suffer from the same Dom0 IO dependencies as Xen, I could assign the Dom0 cgroup a low priority.
In other words, is there any potential performance degradation from all the background Dom0 processes, like ntpd, yum etc, competing with VMs whose resource allocations are being explicitly controlled via cgroups? What is the best practice here?
Is there a particular formula to calculate the amount of cpu resources that is allocated for a process when you "nice" it?
I have a windows service that needs to run with High Priority.
At the end of the day I want to use this script to modify the priority after service startup:
Const HIGH = 256
strComputer = "."
strProcess = "BntCapi2.exe"
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colProcesses = objWMIService.ExecQuery _
("Select * from Win32_Process Where Name = '" & strProcess & "'")
For Each objProcess in colProcesses
objProcess.SetPriority(HIGH)
Next
But currently I am not able to change the priority, even with the taskmanger. The taskmananger throws an "Access Denied" error, but I am logged on as administrator and I changed the user account of the service to administrator, too.
I still get the "access denied" message when trying to change the priority. Any ideas what permission I need to do that?
Please help refine a discussion going on in our shop.
Consider the following scenario. There is a Microsoft VPC running several apps and services (Windows 2003 server). The server has two or three critical roles. Every so often, CPU utilization goes to 100% on a sustained basis. One of the culprits in this is a legacy application, for which the only real solution, at this time, is to restart the service. After this, CPU utilization returns to something reasonable (on average, 60-80%). However, less often, when the server is at 100% CPU, another service appears to be using the lion's share, a security application that parses logs. Our operations team's impulse is to restart that as well when the CPU becomes pegged. Our security team points out that this is pointless, as this service is running at BelowNormal priority, so effectively it is not depriving any other process of CPU. Security argues that the 100% CPU usage in those cases should really not be considered a critical condition. If a BelowNormal priority process is using most of the CPU, then there is actually no CPU deficit at all. Operations, on the other hand, is skeptical that 100% CPU utilization could really be a condition without adverse consequences, and doesn't want to ignore it. Who is right? Is Security right that it's nothing to worry about or Operations that we ought to do something?