I have several physical file and I want to use file map (MapViewOfFileEx) to map the file into memory to improve performance. Each file is about several hundred M bytes. All the memory mapped files are kept open during my application.
The mapping is successful, but the strange thing is,
1. the performance to access the files which are opened at first is very fast;
2. the performance to access the files which are opened later is slower and slower (the performance to access the 10th file is very bad).
Any ideas to improve performance?
thanks in advance,