The Address Space Real Storage Attribute Group provides information about the real storage allocated to an address space in terms of various types of frame counts and slot counts, as well as the management status of a given address space.
Address Space Name The name of the job, TSO user, started task, or APPC address space reported on in the row. Valid value is a simple text string of from 1 to 8 characters.
ASID The identifier of the address space for which data is being displayed.
Central Frame Count The total number of central storage frames, including any frames that are backing user dataspaces. Valid value is a 4-byte integer.
Central Shared Pages Shared pages in central storage that are valid in the current address space.
Dispatching Priority The dispatching priority of an address space. Dispatching priorities are set either in the IEAIPS member of PARMLIB or without an IPS, through JCL, or a corresponding TSO logon. Dispatching priorities control the access of an address space to the CPU relative to other jobs and users. Dispatching priorities can range from 1 to 255, with larger numbers indicating higher priority.
Expanded Frame Count The total number of expanded storage frames, including any dataspace frames that have been paged out to expanded storage.
Fixed Frame Count The total number of fixed frames, including fixed frames found on the pageable frame queue and all frames found on the fixed frame queue. Valid value is a 4-byte integer.
High UIC How long the oldest frame of pageable storage has gone without being referenced, in seconds. The unreferenced interval count (UIC) is inversely related to contention for real storage--the lower the UIC, the more quickly frames are being referenced. When SRM determines that there is a shortage of available frames, it uses the high UIC of all address spaces in deciding which pages to steal. Frames with the highest UIC are the most likely to be stolen.
Hiperspace Frame Count The total number of hiperspace frames. Hiperspace allows a program to store and retrieve data directly from expanded storage, thus avoiding the overhead of DASD I/O. Valid value is a 4-byte integer.
Managed System A z/OS operating system in your enterprise that is being monitored by a Tivoli OMEGAMON XE on z/OS agent. Valid value is a character string with a maximum length of 32 bytes.
Management Status The management status of the address space. Valid values are:
Monitored | The Working Set Manager has noticed that the address space is using an excessive amount of CPU for paging and is actively keeping track of its central storage use and paging rates. |
Managed | The Working Set Manager has determined that the paging rate of the monitored address space continues to be excessive and some type of action must be taken. |
Isolated | The address space is storage isolated. An address space in this state is exempt from Working Set Manager action. |
NonSwap | The address space is non-swappable and is therefore beyond Working Set Manager control. |
OK | The address space is of no interest to the Working Set Manager. |
Unknown | The management status of the address space is unknown. |
Non-virtual I/O Slot Count The number of 4K blocks allocated in auxiliary storage for pages other than virtual I/O pages. Valid value is a 4-byte integer.
Other Aux Storage Slots Other virtual storage slots in use by the address space.
Page ins per second The page fault rate, which does not include page reclaims or pages brought in for either VIO datasets or swap-ins. A consistently high number may be an indication that work is being delayed by contention for real and expanded storage.
Page outs per second The number of page-outs per second. It includes those pages that were stolen by the real storage manager (RSM) in an attempt to increase the number of available frames. The number does not include page-outs for VIO or swap-ins requests. Although a high page-out value may not necessarily mean that workload performance is being affected by paging, it may be a sign of contention for real storage.
Shared Page views Member of a group of virtual addresses that are backed by the same frame of processor storage.
Status The current status of the job or user, including the dispatchability and swap status of the job. Dispatchability is displayed in the first part of the Status field, while swap status is displayed in the last part of the field. Dispatchability may be either CPU (waiting for CPU) or WAT (Waiting). Swap status may be LSW (logically swapped), NSW (Nonswappable), RES (Swapped in; resident), SWP (swapped out), or DLY (waiting for other reasons, which may include an enqueue, SRM delay, or voluntary wait. An asterisk may appear in the middle of the field, indicating that the task is currently in transaction.
Swap Status The swap status of the address space. Valid values are:
IN | The address space is swapped in and occupies central storage. |
OUT | The address space is swapped out and does not occupy central storage. |
IN NSW | The address space is in central storage and is non-swappable. |
OUT LSW | The address space is logically swapped and occupies central storage. |
UNKNOWN | Swap status is unknown. |
User Key Dataspace The maximum number of 4K virtual storage blocks of user key dataspace that can be used by this address space. Valid value is a 4-byte integer.
Virtual I/O Slot Count The number of 4K blocks allocated in auxiliary storage for virtual I/O pages. Valid value is a 4-byte integer.
Working Set Size The number of frames of real storage an address space has in use. Often defined as the minimum number of pages that an application needs to do work. With expanded storage installed, working set size also includes the number of expanded storage frames that the user owns. In systems with expanded storage, the working set is divided into three parts. The primary working set consists of LSQA pages, fixed pages, and at least one page per segment. The secondary working set is all other referenced pages. The remaining, unreferenced pages are contained in the nonworking set.