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Example Performance Monitor output in which the computer experiences the issue over time. If the Memory\System Cache Resident Bytes counter in Performance Monitor shows an upward trend over time, the computer is experiencing the issue, as shown in Figure 3.įigure 3. Example RamMap output in which the computer is not experiencing the issue. Example RamMap output in which the computer is experiencing the issue.įigure 2. You can verify this by using Performance Monitor to monitor the Memory\System Cache Resident Bytes counter and see the cache grow continuously over time.įigure 1.
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If the top use count is “Metafile,” and if a large part of available memory is being used, you are experiencing the System File Cache issue that is described in the "Symptoms" section. Click the Active column to sort by the number of bytes used, and note the top usage directly under the total. This displays several columns that show the current pattern of memory usage. When you run the tool, select the Use Counts option.
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You can obtain the tool from the following Windows Sysinternals website:
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To determine whether your system is affected by this issue, install the SysInternals RamMap tool.
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How to determine whether your system is affected
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There are only certain unique situations in which you have to implement this service on computers that are running Windows 7 or Windows Server 2008 R2. The memory management algorithms in Windows 7 and Windows Server 2008 R2 operating systems were updated to address many file caching problems that were found in earlier versions of Windows. In this situation, the working set for the system file cache can increase to consume most of the physical RAM. On 64-bit versions of Windows operating systems, the size of the virtual address range is typically larger than the physical RAM.
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This can cause allocation failures for other kernel components. However, the cache can exhaust the virtual address space in the kernel. If the computer has more than 2 GB of physical RAM, the cache cannot exhaust all the physical RAM. The limitation of this memory range is less than 2 GB. The working set of the system file cache increases to consume the virtual address range of the kernel mode at the expense of other kernel resources. On 32-bit versions of Windows Vista operating systems, kernel resources are allocated dynamically. The limitation of the virtual address range prevents the working sets of the system file cache from exhausting the physical RAM. On 32-bit versions of Microsoft Windows operating systems earlier than Windows Vista, the working sets of the system file cache have a theoretical memory limit of less than 1 gigabyte (GB). Therefore, sufficient amounts of physical RAM are not available for other processes. The system file cache consumes the physical RAM. If there is a continuous and high volume of cached read requests from any process or from any driver, the working set size of the system file cache will grow to meet this demand. This behavior also applies to the working set of the system file cache. This behavior decreases the performance of applications and services because the memory pages are continuously written to the hard disk and read from the hard disk. In this situation, the working sets for all the other processes are paged out to the hard disk. If these requests are continuous and unchecked, the working set of the process will grow to consume all the physical RAM. If any process requests and uses a large amount of memory, the size of the working set (the number of memory pages in the physical RAM) of the process increases.
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Memory management in Microsoft Windows operating systems uses a demand-based algorithm. There is a continuous and high volume of cached read requests to the hard disk. The system file cache consumes most of the physical RAM. Additionally, you notice the following symptoms: You experience performance issues in applications and services in various versions of Windows XP, Windows Vista, Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2.
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