Package oshi.hardware

Interface VirtualMemory

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      long getSwapPagesIn()
      Number of pages read from paging/swap file(s) to resolve hard page faults.
      long getSwapPagesOut()
      Number of pages written to paging/swap file(s) to free up space in physical memory.
      long getSwapTotal()
      The current size of the paging/swap file(s), in bytes.
      long getSwapUsed()
      The current memory committed to the paging/swap file(s), in bytes
      long getVirtualInUse()
      The memory currently committed by the system, in bytes.
      long getVirtualMax()
      The maximum memory that can be committed by the system without extending the paging file(s), in bytes.
    • Method Detail

      • getSwapTotal

        long getSwapTotal()
        The current size of the paging/swap file(s), in bytes. If the paging/swap file can be extended, this is a soft limit.
        Returns:
        Total swap in bytes.
      • getSwapUsed

        long getSwapUsed()
        The current memory committed to the paging/swap file(s), in bytes
        Returns:
        Swap used in bytes
      • getVirtualMax

        long getVirtualMax()
        The maximum memory that can be committed by the system without extending the paging file(s), in bytes. Also called the Commit Limit. If the paging/swap file can be extended, this is a soft limit. This is generally equal to the sum of the sizes of physical memory and paging/swap file(s).

        On Linux, represents the total amount of memory currently available to be allocated on the system based on the overcommit ratio, identified as CommitLimit. This may be higher or lower than the total size of physical and swap memory depending on system configuration.

        Returns:
        Max Virtual Memory in bytes
      • getVirtualInUse

        long getVirtualInUse()
        The memory currently committed by the system, in bytes. Also called the Commit Total. This is generally equal to the sum of the bytes used of physical memory and paging/swap file(s).

        On Windows, committing pages changes this value immediately; however, the physical memory is not charged until the pages are accessed, so this value may exceed the sum of used physical and paging/swap file memory.

        Returns:
        Swap used in bytes
      • getSwapPagesIn

        long getSwapPagesIn()
        Number of pages read from paging/swap file(s) to resolve hard page faults. (Hard page faults occur when a process requires code or data that is not in its working set or elsewhere in physical memory, and must be retrieved from disk.) This property was designed as a primary indicator of the kinds of faults that cause system-wide delays. It includes pages retrieved to satisfy faults in the file system cache (usually requested by applications) and in non-cached mapped memory files.
        Returns:
        Pages swapped in
      • getSwapPagesOut

        long getSwapPagesOut()
        Number of pages written to paging/swap file(s) to free up space in physical memory. Pages are written back to disk only if they are changed in physical memory, so they are likely to hold data, not code. A high rate of pages output might indicate a memory shortage. The operating system writes more pages back to disk to free up space when physical memory is in short supply.
        Returns:
        Pages swapped out