Named counter server: storage statistics

These are statistics returned by the AXM page pool management routines for the pools AXMPGANY and AXMPGLOW. Storage in these pools is allocated in multiples of 4K pages on a 4K boundary. The most frequent use is for segments of LIFO stack storage.

Storage is initially allocated from the pool using a bit map. For faster allocation, free areas are not normally returned to the pool but are added to a vector of free chains depending on the size of the free area (1 to 32 pages). When storage is being acquired, this vector is checked before going to the pool bit map.

If there are no free areas of the right size and there is not enough storage left in the pool, free areas in the vector are put back into the pool, starting from the smallest end, until a large enough area has been created. This action appears as a compress attempt in the statistics. If there is still insufficient storage to satisfy the request, the request fails.

These statistics are for the named storage page pool produced since the most recent statistics (if any). Each of the storage statistics is shown in kilobytes and as a percentage of the total size.

The statistics are described in detail in the DFHNCS5D data area.

Table 181. Temporary storage data sharing: usage statistics
Statistic name Field Description
LOC=ANY storage pool statistics
Name S5ANYNAM Pool name AXMPGANY.
Size S5ANYSIZ Size of the storage pool area.
S5ANYPTR Address of storage pool area.
S5ANYMX Total pages in the storage pool.
In Use S5ANYUS Number of used pages in the pool.
Free S5ANYFR Number of free pages in the pool.
Min Free S5ANYLO The lowest free pages (since reset).
Gets S5ANYRQG Storage GET requests.
Frees S5ANYRQF Storage FREE requests.
Fails S5ANYRQS GETs which failed to obtain storage.
Retries S5ANYRQC Compress (defragmentation) attempts.
LOC=BELOW storage pool statistics
Name S5LOWNAM Pool name AXMPGLOW.
Size S5LOWSIZ Size of the storage pool area.
S5LOWPTR Address of the storage pool area.
S5LOWMX Total pages in the storage pool.
In Use S5LOWUS Number of used pages in the storage pool.
Free S5LOWFR Number of free pages in the storage pool.
Min Free S5LOWLO The lowest number of free pages (since reset).
Gets S5LOWRQG Storage GET requests.
Frees S5LOWRQF Storage FREE requests.
Fails S5LOWRQS GETs which failed to obtain storage.
Retries S5LOWRQC Compress (defragmentation) attempts.

Related reference
Interpreting server statistics
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