Page files extend how much "committed memory" also known as "virtual memory" is used to store modified data. The system commit memory limit is the sum of physical memory and all page files combined. It represents the maximum system-committed memory also known as the "system commit charge" that the system can support. The system commit charge is the total committed or "promised" memory of all committed virtual memory in the system. If the system commit charge reaches the system commit limit, the system and processes might not get committed memory.
This condition can cause freezing, crashing, and other malfunctions. Therefore, make sure that you set the system commit limit high enough to support the system commit charge during peak usage. System-managed page files automatically grow up to three times the physical memory or 4 GB whichever is larger, but no more than one-eighth of the volume size when the system commit charge reaches 90 percent of the system commit limit.
This assumes that enough free disk space is available to accommodate the growth. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Computers that are running Microsoft Windows or Microsoft Windows Server usually must have a page file to support a system crash dump.
System administrators now have the option to create a dedicated dump file instead. A dedicated dump file is a page file that is not used for paging.
Dedicated dump files can be put on any disk volume that can support a page file. We recommend that you use a dedicated dump file if you want a system crash dump but you do not want a page file. To learn how to create it, see Overview of memory dump file options for Windows.
By default, page files are system-managed. This means that the page files increase and decrease based on many factors, such as the amount of physical memory installed, the process of accommodating the system commit charge, and the process of accommodating a system crash dump. For example, when the system commit charge is more than 90 percent of the system commit limit, the page file is increased to back it. This continues to occur until the page file reaches three times the size of physical memory or 4 GB, whichever is larger.
This all assumes that the logical disk that is hosting the page file is large enough to accommodate the growth. The following table lists the minimum and maximum page file sizes of system-managed page files in Windows 10 and Windows Several performance counters are related to page files.
This section describes the counters and what they measure. The following performance counters measure hard page faults which include, but are not limited to, page file reads :. Hard page faults are faults that must be resolved by retrieving the data from disk. Such data can include portions of DLLs,. These faults might or might not be related to a page file or to a low-memory condition. Hard page faults are a standard function of the operating system.
They occur when the following items are read:. High values for these counters excessive paging indicate disk access of generally 4 KB per page fault on x86 and x64 versions of Windows and Windows Server. This disk access might or might not be related to page file activity but may contribute to poor disk performance that can cause system-wide delays if the related disks are overwhelmed.
Therefore, we recommend that you monitor the disk performance of the logical disks that host a page file in correlation with these counters.
Be aware that a system that has a sustained hard page faults per second experiences KB per second disk transfers. No performance counter directly measures which logical disk the hard page faults are resolved for. Not all the memory on the modified page list is written out to disk. If a system is configured to have more than one page files, the page file that responds first is the one that is used. If you adjust the page file in Windows 10 correctly, you can ensure that you are getting the best performance that your hard drive and other components can deliver.
For most circumstances, the default setting of letting Windows handle it is fine. But when you own some older hardware, or you have a unique hard drive configuration, you want something more specific set up.
If you are choosing to set a custom amount, you need to take your total RAM amount and multiply it by 1. Set the maximum size to 3 times your total RAM amount.
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