Hello All,
Please guide me how to calculate the memory/buffer requirements of SAP.
Could you please explain the below details.
What is Shared memory pools and its uses and also we found
ipc/shm_psize_01 -10
ipc/shm_psize_02 -40
ipc/shm_psize_03 -10
ipc/shm_psize_04 -10
ipc/shm_psize_06 -40
ipc/shm_psize_07 -10
ipc/shm_psize_08 -10
ipc/shm_psize_09 -10
ipc/shm_psize_10 740000000
ipc/shm_psize_19 -40
ipc/shm_psize_30 -10
ipc/shm_psize_31 -10
ipc/shm_psize_33 -10
ipc/shm_psize_34 -10
ipc/shm_psize_40 1554000000
ipc/shm_psize_51 -10
ipc/shm_psize_52 -10
ipc/shm_psize_54 -10
ipc/shm_psize_55 -10
ipc/shm_psize_57 -10
ipc/shm_psize_58 -10
ipc/shm_psize_62 -10
why some of the shared pool value is negative
what is OS shared memory segments and how they are calculating memory
Nr of operating system shared memory segments: 10
Shared memory resource requirements estimated
================================================================
Total Nr of shared segments required.....: 10
System-imposed number of shared memories.: 1000
Shared memory segment size required min..: 1554000000 (1482.0 MB)
Currently available maximum segment size.: 34359738368 (32768.0 MB)
As per the below details,process means - SM50 work process and how they are calulating minimum ,worst case requirement etc...
Swap space requirements estimated
================================================
Shared memory....................: 2414.3 MB
..in pool 10 702.6 MB, 99% used
..in pool 40 1478.3 MB, 99% used
..not in pool: 226.5 MB
Processes........................: 649.7 MB
Extended Memory .................: 5120.0 MB
------------------------------------------------
Total, minimum requirement.......: 8184.0 MB
Process local heaps, worst case..: 9536.7 MB
Total, worst case requirement....: 28600.7 MB
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================================================================================
== Checking profile: /sapmnt/SID/profile/SID_DVEBMGS00_server9
================================================================================
Maximum shared memory size > 20G
Shared memory disposition overview
================================================================
Shared memory pools
Key: 10 Pool
Size configured.....: 740000000 ( 705.7 MB)
Size min. estimated.: 736762358 ( 702.6 MB)
Advised Size........: 740000000 ( 705.7 MB)
Key: 40 Pool for database buffers
Size configured.....: 1554000000 (1482.0 MB)
Size min. estimated.: 1550132276 (1478.3 MB)
Advised Size........: 1554000000 (1482.0 MB)
Shared memories inside of pool 10
Key: 1 Size: 2500 ( 0.0 MB) System administration
Key: 3 Size: 101680000 ( 97.0 MB) Disp. communication areas
Key: 4 Size: 531448 ( 0.5 MB) statistic area
Key: 7 Size: 14838 ( 0.0 MB) Update task administration
Key: 8 Size: 67108964 ( 64.0 MB) Paging buffer
Key: 9 Size: 134217828 ( 128.0 MB) Roll buffer
Key: 11 Size: 500000 ( 0.5 MB) Factory calender buffer
Key: 12 Size: 6000000 ( 5.7 MB) TemSe Char-Code convert Buf.
Key: 13 Size: 60500000 ( 57.7 MB) Alert Area
Key: 14 Size: 20000768 ( 19.1 MB) Presentation buffer
Key: 16 Size: 22400 ( 0.0 MB) Semaphore activity monitoring
Key: 17 Size: 2760892 ( 2.6 MB) Roll administration
Key: 30 Size: 51200 ( 0.0 MB) Taskhandler runtime admin.
Key: 31 Size: 8412000 ( 8.0 MB) Dispatcher request queue
Key: 33 Size: 92160000 ( 87.9 MB) Table buffer, part.buffering
Key: 34 Size: 25600000 ( 24.4 MB) Enqueue table
Key: 51 Size: 18000000 ( 17.2 MB) Extended memory admin.
Key: 52 Size: 180000 ( 0.2 MB) Message Server buffer
Key: 54 Size: 61448192 ( 58.6 MB) Export/Import buffer
Key: 55 Size: 8192 ( 0.0 MB) Spool local printer+joblist
Key: 57 Size: 1572864 ( 1.5 MB) Profilparameter in shared mem
Key: 58 Size: 4096 ( 0.0 MB) Enqueue ID for reset
Key: 62 Size: 85983232 ( 82.0 MB) Memory pipes
Shared memories inside of pool 40
Key: 2 Size: 58556852 ( 55.8 MB) Disp. administration tables
Key: 6 Size: 851968000 ( 812.5 MB) ABAP program buffer
Key: 19 Size: 140000000 ( 133.5 MB) Table-buffer
Key: 42 Size: 70592992 ( 67.3 MB) DB TTAB buffer
Key: 43 Size: 273654392 ( 261.0 MB) DB FTAB buffer
Key: 44 Size: 48374392 ( 46.1 MB) DB IREC buffer
Key: 45 Size: 33014392 ( 31.5 MB) DB short nametab buffer
Key: 46 Size: 20480 ( 0.0 MB) DB sync table
Key: 47 Size: 20481024 ( 19.5 MB) DB CUA buffer
Key: 48 Size: 500000 ( 0.5 MB) Number range buffer
Key: 49 Size: 2968344 ( 2.8 MB) Spool admin (SpoolWP+DiaWP)
Shared memories outside of pools
Key: 18 Size: 2688100 ( 2.6 MB) Paging adminitration
Key: 41 Size: 25010000 ( 23.9 MB) DB statistics buffer
Key: 63 Size: 409600 ( 0.4 MB) ICMAN shared memory
Key: 64 Size: 4202496 ( 4.0 MB) Online Text Repository Buf.
Key: 65 Size: 204808192 ( 195.3 MB) Export/Import Shared Memory
Key: 81 Size: 21760 ( 0.0 MB) Security Audit Log
Key: 1002 Size: 400000 ( 0.4 MB) Performance monitoring V01.0
Key: 58900100 Size: 4096 ( 0.0 MB) SCSA area
Nr of operating system shared memory segments: 10
Shared memory resource requirements estimated
================================================================
Total Nr of shared segments required.....: 10
System-imposed number of shared memories.: 1000
Shared memory segment size required min..: 1554000000 (1482.0 MB)
Currently available maximum segment size.: 34359738368 (32768.0 MB)
Swap space requirements estimated
================================================
Shared memory....................: 2414.3 MB
..in pool 10 702.6 MB, 99% used
..in pool 40 1478.3 MB, 99% used
..not in pool: 226.5 MB
Processes........................: 649.7 MB
Extended Memory .................: 5120.0 MB
------------------------------------------------
Total, minimum requirement.......: 8184.0 MB
Process local heaps, worst case..: 9536.7 MB
Total, worst case requirement....: 28600.7 MB
Errors detected..................: 0
server9:sidadm 13>
Parameters at SAP level
em/initial_size_MB - 5120
EM/TOTAL_SIZE_MB - 16000
ztta/roll_extension - 3500000000
abap/heap_area_dia - 6000000000
abap/heap_area_nondia - 4000000000
abap/heap_area_total - 10000000000
em/address_space_MB 4096
abap/heaplimit 40894464
abap/buffersize- 800000
Regards
Subb