private static long GetNumBytesUsed(int numInts)
{
// force garbage collection
GC.Collect();
var begin = MemoryUtilities.NumBytesUsed(true);
var ints = new int[numInts];
ints[0] = 123;
var end = MemoryUtilities.NumBytesUsed(true);
// force the array to be in memory until we have our measurements
Assert.Equal(123, ints[0]);
return(end - begin);
}