On Microsoft System Center 2012 Configuration Manager (ConfigMgr 2012) sites that have many Standard or Pull distribution points, installing or upgrading all distribution points may take longer than expected. This can occur if the Distribution Manager component cannot create additional threads for the installation or upgrade process.
Additionally, you will receive messages that resemble the following in the Distmgr.log file:
DP upgrade processing thread: No more available threads left to process any more upgrade distribution point notification. Will wait for existing distribution point upgrades.
If you receive this message repeatedly, you can reduce the overall time that is required to complete the process by increasing the number of processing threads.
For complete details please see the following:
J.C. Hornbeck | Solution Asset PM | Microsoft GBS Management and Security Division
System Center All Up: http://blogs.technet.com/b/systemcenter/
System Center – Configuration Manager Support Team blog: http://blogs.technet.com/configurationmgr/
System Center – Data Protection Manager Team blog: http://blogs.technet.com/dpm/
System Center – Orchestrator Support Team blog: http://blogs.technet.com/b/orchestrator/
System Center – Operations Manager Team blog: http://blogs.technet.com/momteam/
System Center – Service Manager Team blog: http://blogs.technet.com/b/servicemanager
System Center – Virtual Machine Manager Team blog: http://blogs.technet.com/scvmm
The Forefront Endpoint Protection blog : http://blogs.technet.com/b/clientsecurity/
The Forefront Identity Manager blog : http://blogs.msdn.com/b/ms-identity-support/
The Forefront TMG blog: http://blogs.technet.com/b/isablog/
The Forefront UAG blog: http://blogs.technet.com/b/edgeaccessblog/