[Insight-users] Artificial memory limit on ITK?

[Bill Hoffman]

Mark Wyszomierski wrote:
> Hi,
>
> I'm using itkResampleImage in a multithreaded environment in win32. My
> process at some point uses 902mb of memory - then each thread does a
> resample piece like:
>
> void ThreadFunction()
> {
>     try {
>         itkResampleImage::Update();
>     }
>     ....
> }
>
> The first thread that calls itkResampleImage::Update() always fails
> and the caught exception just says something along the lines of "error
> allocating image memory". It actually fails allocating the internal
> high resolution image buffer which is a little over 80 mb.
>
> This thread then fails and releases its memory down to about 700mb,
> and all other threads that call this same function process just fine!
>
> Is there some internal memory cap of 1.0gb per process for
> itkResampleImage or something like that? I can't figure why I keep
> getting this error - the process should be able to allocate up to 2 gb
> of memory if necessary.
>   
It could be system memory fragmentation.   The OS may not have chunks 
big enough at
the time of the call.

-Bill