The SUMDUMP or SUM option on the SDUMP or SDUMPX macro causes SVC dump to capture a summary dump. Two types of information are captured in summary dumps. First, index data for storage is captured. This index data can be formatted using the IPCS VERBX SUMDUMP command. The second type of information captured is the storage itself. Storage captured by summary dump processing can be viewed using IPCS by specifying the SUMDUMP option (for example, IPCS LIST 00003000 SUMDUMP). IBM® strongly recommends that you view the SUMDUMP output prior to investigating the usual portions of the dump. The SUMDUMP option provides different output to SDUMPX branch entries and SVC entries to SDUMP. For example, data included for branch entries to SDUMPX include PSA, LCCA, and PCCA control blocks, and data recorded for SVC entries to SDUMPX include RTM2WA control blocks. Each summary dump index record, when formatted using the IPCS VERBX SUMDUMP command, is displayed as “----tttt---- range-start range-end range-asid range-attributes”. The range-attributes include a value of INCOMP, which means that some or all of the areas represented by the specified range may not be in the dump.
Figure 1 is an example format using the IPCS VERBX SUMDUMP command. The summary dump is formatted by the IPCS VERBEXIT SUMDUMP subcommand and has an index which describes what the summary contains. Summary dumps are not created for dumps taken with the DUMP command. Only dumps created by the SDUMP or SDUMPX macro contain summary dumps.
STORAGE TYPE RANGE START RANGE END ASID ATTRIBUTES
REGISTER AREA-- 0135F000 01363FFF 001E (COMMON)
REGISTER AREA-- 00000001_7F5AD000 00000001_7F5B0FFF 001E Figure 2 is a partial example of a summary dump using the IPCS VERBX SUMDUMP command.
STORAGE TYPE RANGE START RANGE END ASID ATTRIBUTES
023BCD70 023BCD7F 001E (COMMON)
SUMLSTA RANGE -- 017E8000 017E8FFF 0001 (COMMON)
SUMLSTA RANGE -- 01F9B000 01F9CFFF 0001 (COMMON)
SUMLSTA RANGE -- 02166000 02167FFF 0001 (COMMON)
PSA ------------ 00000000 00001FFF 001E (COMMON)
PCCA ----------- 00F43008 00F4324F 001E (COMMON)
LCCA ----------- 00F82000 00F82A47 001E (COMMON)
LCCX ----------- 021C7000 021C771F 001E (COMMON)
INT HANDLER DUCT 02232FC0 02232FFF 001E (COMMON)
I.H. LINKAGE STK 02262000 0226202F 001E (COMMON)
REGISTER AREA -- 0000E000 00010FFF 001E
REGISTER AREA -- 00FC4000 00FC6FFF 001E (COMMON)
REGISTER AREA -- 00000001_7F5AD000 00000001_7F5B0FFF 001E
REGISTER AREA -- 7FFFE000 7FFFEFFF 001E To examine the storage shown in Figure 2, invoke the IPCS LIST command, as shown in Figure 3.
IPCS LIST 00FC4000. SUMDUMP LEN(256) DISPLAY
****************************** TOP OF DATA ***********************************
LIST 00FC4000 ASID(X'001E') SUMDUMP LENGTH(X'0100')
AREA
ASID(X'001E') SUMDUMP ADDRESS(FC4000.) KEY(00)
00FC4000. 7F6BFFD0 7F6BFFD0 02259010 00000000 |",.}",.}........|
00FC4010. 0225D000 02259010 00000004 00000001 |..}.............|
00FC4020. 00000000 00FC3E10 00000000 00000000 |................|
00FC4030. 00000000 00000000 00000000 00800000 |................|
00FC4040. 06102000 00000000 00000000 00000000 |................|
00FC4050 LENGTH(X'10')==>All bytes contain X'00'
00FC4060. 00000000 02247CB8 00000000 00000000 |......@.........|
00FC4070. 02258040 0000164E 00008000 00000000 |... ...+........|
00FC4080 LENGTH(X'80')==>All bytes contain X'00'
****************************** END OF DATA ***********************************For more information about the record ID values, see the SMDLR and SMDXR control blocks in z/OS® MVS™ Data Areas in z/OS Internet library.