# About memory

Measuring memory usage in a multi-process browser

## Summary

Summary of memory used by currently active browsers. For browsers which use multiple processes, memory reflects aggregate memory used across all browser processes.

For , processes used to to display diagnostics information (such as this "about:memory") are excluded.

| Memory Memory Private: Resident memory size that is not shared with any other process. This is the best indicator of browser memory resource usage. Shared: Resident memory size that is currently shared with 2 or more processes. Note: For browsers using multiple processes, if we simply added the shared memory of each individual process, this value would be inflated. Therefore, this value is computed as an approximate value for shared memory in each of the browser's processes. Note also that shared memory varies depending on what other processes are running on the system, and may be difficult to measure reproducibly. Total: The sum of the private + shared resident memory sizes. | Virtual memory Virtual memory Private: The resident and paged bytes committed for use by only this process. Mapped: Total bytes allocated by this process that are mapped into the view of a section, backed by either system pagefile or file system. This is primarily memory-mapped files.
--- | --- | ---
Browser | Private | Shared | Total | Private | Mapped
| k | k | k | k | k

Note: This page will show memory use for all running browsers, not just Chrome.
Note: Chrome includes memory used by plug-ins, other browsers may not.

## Processes

Details of memory usage for each of 's processes.

|  | Memory | Virtual memory
--- | --- | --- | ---
PID | Name | Private | Shared | Total | Private | Mapped
| Browser | k | k | k | k | k
|  | k | k | k | k | k
| Σ | 0k |  | 0k | 0k | This is an approximation. Conceptually, this is the total amount of in-memory pages for the entire logical application, without double counting shared pages (e.g. mapped DLLs, SharedMemory bitmaps, etc.) across the browser and renderers. 0k
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