# CacheSet - Sysinternals | Microsoft Learn CacheSet v1.02 — Summary By Mark Russinovich — Published: December 16, 2021 What it is * CacheSet is a small utility for Windows that lets you view and manipulate the system file cache working-set parameters (minimum and maximum sizes) and reset or clear the cache’s working set. * Unlike older tools (e.g., CacheMan), CacheSet works across NT-based Windows versions and immediately applies changes. Key features / actions * Real-time display: shows current cache size (updated twice per second) and peak size since last reboot. * Set minimum and maximum working-set sizes: enter values and click Apply. Errors appear if values violate system limits (max < min, min below system minimum, or max above system maximum). * Reset: restore the cache working-set values that were active when CacheSet was started. * Clear: force the cache to release all of its working-set pages (this makes those pages available to other programs; the cache can grow again as needed). This is not the same as flushing cached file data to disk. * Command-line support: you can run CacheSet with two arguments to set min and max silently — useful for startup configuration. * Usage: CacheSet \[minimum working set] \[maximum working set] How it works (internals) * CacheSet queries and sets cache sizing via NtQuerySystemInformation and NtSetSystemInformation. * Those calls lead to MmAdjustWorkingSetSize, which adjusts or trims working sets. A special parameter causes the system cache working set to be adjusted rather than the current process. * Passing -1 for both min and max triggers a working-set clear. Notes and requirements * Administrative privilege: on NT 4.0 SP4 and later, the "Increase Quota" privilege is required; CacheSet enables this privilege so it works on SP4. * Platform support: Client — Windows Vista and higher; Server — Windows Server 2008 and higher. Downloads and run * Download: (417 KB) * Run now from Sysinternals Live: Last updated: 12/16/2021 (Original article includes a screenshot and additional links on the Microsoft Sysinternals site.)