Anytime shared or isolated mode is used for a print driver, a new process — PrintIsolationHost. The spooler essentially proxies calls for the print processor and other driver components in the PrintIsolationHost. For the print driver that you put into shared or isolation mode however, all the processing takes place in the processor in the ProcessIsolationHost. In this mode, there are a number of differences from the printing model that we have been used to.
As we mentioned above, the print processors and print driver components for each isolated driver are loaded into a separate PrintIsolationHost. Within the spoolsv. In the screenshot below, we can see that the spoolsv. The process is called when needed, and is closed when not required. In shared mode, the printing model is very similar to isolated mode, except that you will only see one PrintIsolationHost. There are two new group policy settings that you can use to control the isolation mode of drivers on machines to which the policy applies.
The two settings are:. For information on how to configure driver isolation using Print Management and Group Policy, see the section titled "Configuring Printer Driver Isolation Mode" later in this tutorial.
Note Print servers might experience a small degradation of performance when driver isolation is implemented due to the increased number of processes running on the system and the additional interprocess communication overhead incurred when the driver calls spooler functions, and vice versa. Additional temporary performance degradation might also be incurred when a new process is created or needs to be recycled. This performance degradation is much more evident when there are many drivers running in Isolated mode than when using Shared mode.
When the Print Server role service of the Print and Document Services server role is installed on Windows Server R2, each printer driver on the print server can run in one of three possible driver Isolation modes: None In this mode, the printer driver will run in the spooler process and not in a separate process. If a driver crashes, the spooler will crash, and administrators must restart the Print Spooler service. All print queues on the server will be offline while the spooler is offline.
This mode is the only option on Windows , Windows , and Windows print servers. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. Plainly, there is an issue when my processor is loaded for operation in isolation. Hopefully someone can clarify what is required for a print processor to be isolation compatible.
Wednesday, March 7, AM. I have first heard about printisolation somewhere 3 -4 year back I do not remember any special peace of code or something suggested by Microsoft except to set the driverisolation in inf but please don't take my word as is. However if I remember correctly, we have done few things for printisolation: make sure that your code is re-entrant, if you are using any synchronization object or if you are waiting on any object watch that area, look out for writing in registry better to use printerdriverdata and its associated api , check what you are doing for printerevent and driverevent.
Check DllMain.
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