![]() ![]() The system file cache maps open files into a portion of the system virtual address range and uses the process working set memory management mechanisms to keep the most active portions of current files resident in physical memory. Memory: Cache Faults /sec - measures the File System Cache.It is imperative that hard page faults are resolved in a timely fashion so that the process of resolving the fault does not unnecessarily delay the program’s execution. The performance of applications will suffer when there is insufficient RAM and excessive hard page faults occur. ![]() Once the copy has completed successfully, the OS allows the program thread to continue on. Hard faults persecond free#The OS then locates a copy of the desired page on the page file, and copies the page from disk into a free page in RAM. There is an Interrupt Service Routine that gains control at this point and determines that the address is valid, but that the page is not resident. The instruction that referenced the page fails and generates an addressing exception that generates an interrupt. When a thread attempts to reference a nonresident memory page, a hardware interrupt occurs that halts the executing program. What happens when a page fault occurs is that the thread that experienced the page fault is put into a Wait state while the operating system finds the specific page on disk and restores it to physical memory. A page fault occurs when a program requests an address on a page that is not in the current set of memory resident pages. (high count indicates working set is too large for memory to handle - could be a mix of hard and soft faults).
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