MEMORY report

This report provides an overview of main memory and virtual address space utilization.

Report output

The REPORT MEMORY statement is used to request the output of the MEMORY report.

 HOST0001 SM2 MEMORY          CYCLE:   60 S  SAMPLES:   144       <date>  <time>

                      MAIN MEMORY FRAMES                           BIG PAGES
 +---------+---------+---------+---------+---------+---------+ +-------+-------+
 |  TOTAL  |PAGEABLE |R-ONLY-Q | RD-WR-Q | EMPTY-Q | SYS-GLOB| | TOTAL |  USED |
 +---------+---------+---------+---------+---------+---------+ +-------+-------+
 |  983040 |  820838 |     285 |     642 |  233348 |  586562 | |     0 |     0 |
 +---------+---------+---------+---------+---------+---------+ +-------+-------+

          # PAGES IN VIRTUAL MEMORY               WORK. SET (PPC)    USED PAGES 
 +-------+-------+--------+--------+--------+  +---------+---------+ +---------+
 |  CL1  |  CL2  |  CL3   |  CL4   | CL4-S  |  |   ALL   |   ACT   | |   ACT   |
 +-------+-------+--------+--------+--------+  +---------+---------+ +---------+
 |  1031 |  2680 |  14407 |  45616 |     80 |  |   57190 |   26972 | |  367537 |
 +-------+-------+--------+--------+--------+  +---------+---------+ +---------+

   PAGING AREA FRAMES              PAGE FAULTS               PAGE TRANSFERS
 +----------+----------+ +---------+---------+---------+ +----------+----------+
 |  TOTAL   |   USED   | |  TOTAL  |1ST-READ |RECLAIMS | |   READ   |  WRITE   |
 +----------+----------+ +---------+---------+---------+ +----------+----------+
 |  3840006 |   864129 | |   946.4 |   946.4 |     0.0 | |      0.0 |      0.0 |
 +----------+----------+ +---------+---------+---------+ +----------+----------+

Monitoring information

MAIN MEMORY FRAMES
TOTAL	Total number of 4 kB pages in main memory
PAGEABLE	Number of pageable 4 kB pages in main memory
R-ONLY-Q	Average number of 4 kB read-only pages in the free pool (read-only queue)
R-WR-Q	Average number of 4 kB read/write pages in the free pool (read/write queue)
EMPTY-Q	Average number of 4 kB pages in the free pool, which are not assigned to a virtual page
SYS-GLOB	Average number of system-globally managed 4 kB page
BIG PAGES
TOTAL	Total number of Big Pages (on x86 servers only)
USED	Number of used Big Pages (on x86 servers only)
# PAGES IN VIRTUAL MEMORY
CL1	Number of class 1 pages (4 kB) in the virtual address space
CL2	Number of class 2 pages (4 kB) in the virtual address space
CL3	Number of class 3 pages (4 kB) in the virtual address space
CL4	Number of all class 4 pages (4 kB) in the virtual address space
CL4-S	Number of class 4 pages (4 kB) for shareable modules in the virtual address space; CL4-S is included in CL4
WORK. SET (PPC)
ALL	Sum of planned page counts (PPCs) of all tasks in the system
ACT	Sum of planned page counts of all active tasks in the system (including the SM2 tasks) (Task queues 0-4)
USED PAGES
ACT	Sum of used page counts (UPG) of all active tasks in the system
PAGING AREA FRAMES
TOTAL	Maximum number of pageable 4 kB pages in all paging devices
USED	Number of pageable 4 kB pages used in all paging devices
PAGE FAULTS
TOTAL	Number of page fault interrupts per second (without “genuine” paging errors)
1ST-READ	Number of page fault interrupts per second caused by the first access to a 4 kB page
RECLAIMS	Number of page fault interrupts per second for which the addressed 4 kB page is still in main memory
PAGE TRANSFERS
READ	Number of 4 kB pages read per second
WRITE	Number of 4 kB pages written per second

The sum of read and written pages does not match the PAGE value under IO'S PER SEC of the ACTIVITY report. Memory management tries to group up to 16 4-kB-page-out pages (WRITE) for one output operation. Each READ causes one 4 kB page to be transferred, i.e. causes one input operation (see also “page fault” in the glossary).