In TPX user exit TPXUGACB, what is the maximum value to specify for NUMENTRY, the number of table entries in the ACB assignment table?
The production system is using the TPXUGACB exit with NYMNTRY=3000. If the system is up for more than about 50 days, the incore table is full and we start having abends:
TPXUGACB - INCORE SAVED ACB TABLE FULL
DUMP TITLE=TPX990E ABEND S0C1 - MODULE=TPXUGACB, TASK=EXITTASK
Recycling TPX resolves this.
I tried to increase the table, first to 4000 and then to 3500, using the test system. When I start TPX in test using these higher values, it will not come up. It fails with U0031:
IEA995I SYMPTOM DUMP OUTPUT 184
USER COMPLETION CODE=0031
TIME=13.41.49 SEQ=00230 CPU=0000 ASID=0021
PSW AT TIME OF ERROR 070C1000 8003A52C ILC 2 INTC 0D
ACTIVE LOAD MODULE ADDRESS=0003A3E0 OFFSET=0000014C
NAME=TPXGTSTR
DATA AT PSW 0003A526 - 00181610 0A0D9104 049F47E0
AR/GR 0: 00000000/80000000 1: 00000004/8000001F
2: 00000000/00019000 3: 00000000/00000000
4: 00000000/00000000 5: 00000000/21764000
6: 00000000/008D6FC8 7: 00000000/00000000
8: 00000000/80000000 9: 00000000/00000000
A: 00000000/80010712 B: 00000000/00022038
C: 00000000/0003A420 D: 00000000/006B8F48
E: 00000000/80030870 F: 00000000/006B8EB8
END OF SYMPTOM DUMP
TPX® Session Management for z/OS
From the delivered TPXUGACB SRC:
GETSTOR BYTES=AATLEN
...
AATENT DSECT
AATUID DS CL8
AATSID DS CL8
AATAPID DS CL8
AATACB DS CL8
AATENT# EQU *-AATENT LENGTH OF SINGLE ENTRY
NUMENTRY EQU 500 NUMBER OF TABLE ENTRIES
AATLEN EQU AATENT#*NUMENTRY TABLE SIZE
So each of the 4 fields in AATENT (ACB assignment table) has a character length of 8 bytes for a total of 32 bytes.
AATLEN = 32 * NUMENTRY
32 x 4000 = 128000 bytes
32 x 3500 = 112000 bytes
The problem with these values is that TPXUGACB exit is doing a GETSTOR call for 128000 bytes of storage.
The U031 abend occurs because the maximum request allowed by z/OS is for 100,000 bytes.
The maximum value that should work for NUMENTRY is 100,000/32 = 3125.
If you find that 3125 is not sufficient then you need to identify why you are using this exit.
TPX 5.4 documentation: ACB Selection Exit