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large object "out of memory"

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :.NET Framework

We've read a number of MSDN articles, blogs, and forum posts.  But we cannot find a problem or explanation that seems to match what we are seeing.

In a certain configuration our application allocates various arrays of 40 or 80 Mb.  At one point we have about 500 Mb allocated then the app asks for an 80 Mb array - an out of memory exception is thrown.  But, according to a memory analysis tool and perfmon, there is over 1 Gb physical memory available (not to mention an additional 4 Gb in the page file)

We are completely confused as to why this memory allocation fails.  It seems to make no sense.

Any ideas?  TIA.

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