Windows 2008 cpu affinity

If the limit set by the limit attribute is exceeded, an event is written to the event log and an optional set of events can be triggered. These optional events are determined by the action attribute. Note: In IIS 8. In IIS 8. For both cases, the limit attribute in applicationHost. The default value is 0 , which disables CPU limiting. Specifies how the threads of a process that is affinitized to a NUMA node will be scheduled on the node's cores. The numaNodeAffinityMode attribute can be one of the following possible values.

The default value is Soft. Value Description Soft As long as the cores in a NUMA node to which a process is affinitized are available, all threads of the process will be scheduled on those cores. However, if the scheduler cannot schedule the process on the cores of the node that it is affinitized to, it can schedule the process on cores in another NUMA node. Any thread of a process that is affinitized to a NUMA node will be scheduled on the node's cores and only those cores.

No threads of that process will be scheduled on cores in another NUMA node. A NUMA node contains clusters of cores that share a single memory bank.

The numaNodeAssignment attribute can be one of the following possible values. The default value is Most Available Memory. Windows scheduling will determine which NUMA node the process is assigned to. Optional int attribute. The number of processor groups used zero-based. A processor group contains multiple cores. The default value is 0 , which means that a single processor group is used.

Optional timeSpan attribute. Specifies the reset period in minutes for CPU monitoring and throttling limits on an application pool. When the number of minutes elapsed since the last process accounting reset equals the number specified by this property, IIS resets the CPU timers for both the logging and limit intervals. However, the command cannot assign the preferred node. The affinity is a tuple that consists of a processor mask and of a processor group number.

The processor group number qualifies the processor mask and fully qualifies the processor mask when more than one processor group exists. For example, the 0x3 processor mask and the 0 processor group represent a different set of processors from the 0x3 processor mask and the 1 processor group.

This issue occurs because the start command for the Cmd. The concept of a processor group was introduced in Windows Server R2 and in Windows 7 to support more than 64 logical processors. However, the operating system randomly assigns the preferred node that dictates the processor group. Therefore, the processor group is not deterministic. The following are some examples of this new switch in a start command:.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article.

This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request.

The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:. If you do not see your language, it is because a hotfix is not available for that language.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time DST bias. Windows Server General Forum. Sign in to vote. I knew we can set processor affinity to a process. But if a process have mutlple threads, say I have a process with 8 threads, and there are 8 cpus, is it possible to set each thread with one cpu and don't let the thread from one cpu to another?

Friday, July 16, AM. This can be beneficial to other community members reading the thread. Wednesday, July 21, AM. Friday, July 23, AM. I am trying to bind a thread to a cpu instead a process to a cpu.