Active Oldest Votes. Improve this answer. Theodore Tsirpanis 10 10 silver badges 18 18 bronze badges. In this article , it claims that you can reach up to 16 million handles per process. I've noticed also in windows xp that two of my processes exceeded the 10k limit. I'm confused. I guess the limit changed in the meanwhile, also see the answer of Thomas Weller. Community Bot 1 1 1 silver badge. Aardvark Aardvark 8, 7 7 gold badges 44 44 silver badges 63 63 bronze badges.
The debug tool is no longer relevant for Windows 7 and I assume later. Thomas Weller Thomas Weller As the Windows Executive see also here also stores some tracking information about handles, the actual limits are 16,, for bit Windows 10 and 16,, for bit Windows The Executive allocates handle tables on demand in page-sized blocks that it divides into handle table entries. Those are only window object handles, and doesn't impact other types of handles file, event, mutex, etc.
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There are two limits related to the number of handles a process can create: the maximum number of handles the system sets for a process and the amount of memory available to store the handles and the objects the application is referencing with its handles. In most cases the limits on handles are far beyond what typical applications or a system ever use.
A more common class of problems arise because the lifetime of these resources must be managed by applications and, just like for virtual memory, resource lifetime management is challenging even for the best developers. An application that fails to release unneeded resources causes a leak of the resource that can ultimately cause a limit to be hit, resulting in bizarre and difficult to diagnose behaviors for the application, other applications or the system in general.
As always, I recommend you read the previous posts because they explain some of the concepts this post references, like paged pool. Each of these subsystems defines one or more types with the Object Manager to represent the resources they expose to applications.
Every release of Windows introduces new object types with Windows 7 defining a total of You can see the objects defined by running the Sysinternals Winobj utility with administrative rights and navigating to the ObjectTypes directory in the Object Manager namespace:.
When an application wants to manage one of these resources it first must call the appropriate API to create or open the resource. For instance, the CreateFile function opens or creates a file, the RegOpenKeyEx function opens a registry key, and the CreateSemaphoreEx function opens or creates a semaphore. The system can look up the object the handle refers to by indexing into the handle table to locate the corresponding handle entry, which contains a pointer to the object.
For example, if the process successfully opened a file for read access, the handle entry would look like this:. To test the number of handles a process can create, Testlimit implements the —h switch that directs it to create as many handles as possible.
It does so by creating an event object with CreateEvent and then repeatedly duplicating the handle the system returns using DuplicateHandle. By duplicating the handle, Testlimit avoids creating new events and the only resources it consumes are those for the handle table entries.
The total shown for Testlimit in this case is 16,, When you run Testlimit on a bit system, the number of handles it can create is slightly different:. Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. Searching online for a reason I'm not sure if this means that the process has a memory leak or if this is normal.
This doesn't mean a lot to me, if anyone has expertise in how to interpret this, your input would be very much appreciated. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Windows process handle count continues to grow Ask Question. Asked 1 year, 11 months ago. Active 1 year, 11 months ago. Viewed 3k times. When memory is allocated and then freed, would I see the handles increase and decrease?
All rights reserved. This dump file has a breakpoint exception stored in it. The stored exception information can be accessed via.
For analysis of this file, run!
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