On Fri, Nov 27, 2009 at 11:24:37PM +0100, Nicolas Cellier wrote:
I wonder why level 3 stdio was used (FILE * fopen, fclose ...) rather than level 2 (int fid, open, close, ...) in file plugin... Better portability ?
Nicolas
This is an interesting question, and I wonder if anyone has ever measured the difference between the two approaches.
In the Windows VM, FilePlugin uses the standard win32 interface interacting with HANDLE rather than (FILE *). The other VMs use stdio in the file plugin. Loosely speaking, the Windows VM is using "level 2", while the other VMs are working at "level 3".
Has anyone ever measured the file IO performance of an image running on the Windows VM versus a Unix or Mac VM on the same hardware? The plugin could be written in either manner on any of the platforms, so it would be interesting to know if one approach delivers better overall results than the other.
Dave