Now I want to make sure the number of handles is not increasing as time goes by. Could you please recommend a method or a tool that will show where more cleaning up is necessary in my application? If you want help with the handles I suggest that you get a copy of Process Explorer.
There is a "view" available that will give you a list of handles. From that list you should be able depending on the complexity of your app to see which handles should have been released and that should give you a hint as to where to start looking for the problem. When you see With a bit word, that would leave another eight bits for flags, which could be used to, say, identify the type of the handle. For some reason the Well, Lloyd, I downloaded, installed and got the Process Explorer to run.
Look pretty good, but could you please give some indication as to how I can locate a memory leak? I see the threads that go with the process ID; some are highlighted red then green then the highlight is cleared. Make sure that Show Lower Pane is checked on the menu. Now in the lower pane you will see the handles for your app. It isn't much of a science but it does show thru colour changes the handles being created and removed. I think I will get along now finding the code where handles are created, but not removed proberly.
You run Handle by typing "handle". You must have administrative privilege to run Handle. Handle is targeted at searching for open file references, so if you do not specify any command-line parameters it will list the values of all the handles in the system that refer to open files and the names of the files. It also takes several parameters that modify this behavior.
When not in search mode enabled by specifying a name fragment as a parameter , Handle divides its output into sections for each process it is printing handle information for. Dashed lines are used as a separator, immediately below which you will see the process name and its process id PID. Beneath the process name are listed handle values in hexadecimal , the type of object the handle is associated with, and the name of the object if it has one.
When in search mode, Handle prints the process names and id's are listed on the left side and the names of the objects that had a match are on the right. The Executive allocates handle tables on demand in page-sized blocks that it divides into handle table entries. That means a page, which is bytes on both x86 and x64, can store entries on bit Windows and entries on bit Windows.
The Executive determines the maximum number of pages to allocate for handle entries by dividing the hard-coded maximum,16,,, by the number of handle entries in a page, which results on bit Windows to 32, and on bit Windows to 65, Because the Executive uses the first entry of each page for its own tracking information, the number of handles available to a process is actually 16,, minus those numbers, which explains the results obtained by Testlimit: 16,,, is 16,, and 16,,,, is 16,, The second limit affecting handles is the amount of memory required to store handle tables, which the Executive allocates from paged pool.
The Executive uses a three-level scheme, similar to the way that processor Memory Management Units MMUs manage virtual to physical address translations, to keep track of the handle table pages that it allocates.
The top level serves as pointers into the mid-level tables and includes entries per-page on bit Windows. On bit Windows, there are pointers in a page of top-level pointers. A handle leaker will have a handle count that rises over time. The reason that a handle leak is so insidious is that unlike the handles Testlimit creates, which all point to the same object, a process leaking handles is probably leaking objects as well.
For example, if a process creates events but fails to close them, it will leak both handle entries and event objects. Event objects consume nonpaged pool, so the leak will impact nonpaged pool in addition to paged pool.
If you spot a leak in a process that can host multiple components or extensions, like Explorer, a Service Host or Internet Explorer, then the question is what component is the one responsible for the leak. Sign up or log in Sign up using Google.
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