Flush Windows File Cache

It can be useful to reduce memory usage of a particular VM (on a host with dynamic memory) or for testing and bench-marking purposes.
The utility was compiled with Delphi XE and comes as a simple command-line executable with just two options
- by default (no option) it will flush the file cache working set and empty the memory working set, this is usually very fast and has limited impact.
- “full” will also flush the modified list and purge memory standby list, this can be slow and may slow down the machine for a while after it, as the OS will reload in memory what it really needs.
- “help” will display a small help.
Note that it relies on the undocumented NtSetSystemInformation function. The source code will be available on a github repository as soon as I clean up the proprietary bits.
FWIW, if you have some memory-frugal service to run, it’s entirely feasible to use this utility on a Windows 2008 R2 server and stay under 128 MB RAM usage. Most of the unused OS services will be swapped out, leaving only core services in RAM.
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