How do I monitor bytes per second written or read from a directory (and sub-directories)?

bbranded

Hello, I wish to monitor bytes per second written or read from a directory. Is something like this revealed by .NET framework, similar to that of FileSystemWatcher? I am attempting to monitor I/O to the DfsrPrivate folder to better understand the I/O of the dfsr.exe process. Thanks very much, Matt

Dave Kreskowiak

You can't monitor I/O speed based on a folder. The best you're going to get is to/from the entire disk or the I/O statistics for a process. You'd use the PerformanceCounter[^] counter class and the appropriate performance counters to get the data you want.

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Dave Kreskowiak

bbranded

My work around is to use process monitor by the sysinternals dudes. Then parse the data. With the proper filters in place, the log ("backing file") grows about 4MB/minute; which is manageable. Process Monitor has a feature called File Summary (http://www.pcmag.com/slideshow_viewer/0,3253,l%253D248743%2526a%253D248736%2526po%253D13,00.asp?p=n[^]) which will summarize exactly what I want. Now, I guess the question is, how does Process Monitor gather this information? It's likely via the processes; monitoring the process's handles and where they are reading and writing. For me, this method, using Process Monitor, will do. However, it would still be interesting to investigate further ways to actually ways to grab the handles and identify their I/O. Thanks, Matt

Dave Kreskowiak

Process Monitor does it by sitting over the file system I/O functions. The technique is called API Hooking. PM hooks a lot of functions covering I/O, Registry, Process, ... It maintains a huge database that is populated with the API call data. It can give you all the details on a per-process basis quite easily.

A guide to posting questions on CodeProject[^]
Dave Kreskowiak