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it may decide that it needs to spawn a new thread with a larger stack to perform the rendering Or it may log an error message when testing so that the developers can fine tune the stack size or depend less heavily on stack allocations or so the program can show a dialog box and fail The TEB's St a c k B a s e and St a c k L i mit fields can be used to determine the active stack range The St a c k L i m i t is only updated as you touch pages on the stack and, thus, it's not a reliable way to find out how much uncom mitted stack is left There's an undocumented field, De a l lo c a t i o n St a c k, at exeEec bytes from the beginning of the TEB that will give you this infor mation, but that's undocumented, subject to change in the future, and is too brittle to be reliable The R u n t imeHe l p e r s Probe F o rSuff i c i e n t St a c k function reviewed ear lier may appear promising, but it won't work for this purpose It probes for a fixed number of bytes (48KB on X86 / X64), and, if it finds there isn' t enough, it induces the normal CLR stack overflow behavior That will tear your process down, which is not what we want The same is true of the function shown earlier that uses sta c k a l l o c The good news i s that the V i rt u a lQu e ry Win32 function will provide this information It returns a structure, one field of which is the A l l o c a t i o n B a s e for the original allocation request When Windows reserves a thread's stack, it does so as one contiguous piece of memory The memory manager remembers the base address supplied at creation time, and this is the "end" of the stack; that is, it's the same as the De a l l o c a t i o n St a c k from the TEB If we're in managed code, all we need to do is use P / Invoke to access this information Let's create a new version of the C h e c k F o r S u ff i c i e n t St a c k function using this API Unlike the one earlier, which triggers a stack overflow if there isn't enough stack space, our new function takes a number of bytes as an argument and returns a bool to indicate whether there is enough stack to satisfy the request, enabling the caller to react accordingly.

p u b l i c u n safe stat i c bool Chec k F o rSuffi c ientSt a c k ( long bytes ) { MEMORY_BAS IC_I NFORMATION s t a c k I nfo

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Given that an editing process normally consists of the merging in some way of two streams of material to provide a single output, with transitions and effects being incorporated, and that there is an output stream to be returned to the storage medium, a fairly simple calculation can be performed Assuming the data rate needed is equivalent to serial digital interface (SDI) 270 Mbps to 34 MBps then the three streams (two input and one output) for each uncompressed edit take up slightly more than 100 MBps of bandwidth Thus the storage system and the SAN must be designed to provide at least this bandwidth capability per edit station in a reliable fashion The preceding represents the streaming rate of material transfers between the storage system and the edit station Internally, there are additional performance factors to consider:

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pools, combined, and written back to a third storage pool This represents a very cache-friendly workload for each of the storage pools because there are only single large sequential transactions (reads or writes) at each pool

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