onperf vs onstat information

I am struggling to make sense of some info I am being presented with by onperf and onstat. onstat -g seg output :- Informix Dynamic Server Version 7.31.UC2 -- On-Line -- Up 00:04:25 -- 188416 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 509 1381451777 82000000 58720256 1748 R 6688 480 510 1381451778 85800000 134217728 2640 V 380 16004 511 1381451779 8d800000 4194304 656 M 54 458 Total: - - 197132288 - - 7122 16942 Am I readng this wrong, or does the final section in the first line mean I have some 188416Kb of Shared Memory allocated to this instance? If this IS the case, how come onperf/tools/status for this instance shows only some 2.97Mb rather than 184Mb? I'm sure this is a simple one so accept my apologies in advance. The main reason for the question is that we have some 640Mb physical RAM in the machine which is dedicated to IDS (aren't we all?) and I want to maximise the use of this RAM. Could someone also explain the use of the SHMVIRTSIZE entry in $ONCONFIG - again my understanding is that this is the initial size of the virtual shared memory segment (in Kb) - that being the case, our values do not equate to what I am seeing above. TIA Mr Creosote <<<<<<<<<<< Contents of $ONCONFIG >>>>>>>>>>>>>>>> # # ##### ###### #### ##### # # # # # # # ##### #### # # # # # # # # # # # # # # ###### #### # # #*********************************************************************** *** # # INFORMIX SOFTWARE, INC. # # Title: onconfig.std # Description: INFORMIX-OnLine Configuration Parameters # #*********************************************************************** *** # Root Dbspace Configuration ROOTNAME rootdbs # Root dbspace nameROOTPATH /usr/informix/testchk1 # Path for device containing root dbspace ROOTOFFSET 1024 # Offset of root dbspace into device (Kbytes) ROOTSIZE 650000 # Size of root dbspace (Kbytes) # Disk Mirroring Configuration Parameters MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirroredroot MIRROROFFSET 0 # Offset into mirrored device (Kbytes) # Physical Log Configuration PHYSDBS rootdbs # Location (dbspace) of physical log PHYSFILE 102400 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 10 # Number of logical log files LOGSIZE 51200 # Logical log size (Kbytes) # Diagnostics MSGPATH /informix/online.logt # System message log file path CONSOLE /dev/console # System console message path ALARMPROGRAM /usr/informix/log_full_test.sh # Alarm program path # System Archive Tape Device #TAPEDEV /dev/null # Tape device path TAPEDEV /dev/dat # Tape device path TAPEBLK 32 # Tape block size (Kbytes) TAPESIZE 4096000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/null # Log tape device path#LTAPEDEV /dev/dat # Log tape device path LTAPEBLK 16 # Log tape block size (Kbytes) LTAPESIZE 10240 # Max amount of data to put on log tape (Kbytes) # Optical STAGEBLOB # INFORMIX-OnLine/Optical staging area # System Configuration SERVERNUM 1 # Unique id corresponding to a OnLineinstance DBSERVERNAME enigmat # Name of default database server DBSERVERALIASES enigmat_shm # List of alternate dbservernames NETTYPE tlitcp,1,10,NET # Configure poll thread(s) for nettype NETTYPE ipcshm,1,40,CPU # Configure poll thread(s) for nettype DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT 0 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor NUMCPUVPS 2 # Number of user (cpu) vps SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vpsto one NOAGE 0 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors # Shared Memory Parameters LOCKS 200000 # Maximum number of locks BUFFERS 20000 # Maximum number of shared buffers NUMAIOVPS 1 # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 20 # Maximum number of logical log files CLEANERS 3 # Number of buffer cleaner processes SHMBASE 0x82000000 # Shared memory base address SHMVIRTSIZE 131072 # initial virtual shared memory segmentsize SHMADD 8192 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 300 # Check point interval (in sec) LRUS 8 # Number of LRU queues LRU_MAX_DIRTY 60 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 50 # LRU percent dirty end cleaning limit LTXHWM 50 # Long transaction high water markpercentage LTXEHWM 60 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) # System Page Size # BUFFSIZE - OnLine no longer supports this configuration parameter. # To determine the page size used by OnLine on your platform # see the last line of output from the command, 'onstat -b'. # Recovery Variables # OFF_RECVRY_THREADS: # Number of parallel worker threads during fast recovery or an offline restore. # ON_RECVRY_THREADS: # Number of parallel worker threads during an online restore. OFF_RECVRY_THREADS 10 # Default number of offline workerthreads ON_RECVRY_THREADS 1 # Default number of online workerthreads # Data Replication Variables # DRAUTO: 0 manual, 1 retain type, 2 reverse type DRAUTO 0 # DR automatic switchover DRINTERVAL 30 # DR max time between DR buffer flushes (in sec) DRTIMEOUT 30 # DR network timeout (in sec)DRLOSTFOUND /usr/informix/etc/dr.lostfound # DR lost+found file path # CDR Variables CDR_LOGBUFFERS 2048 # size of log reading buffer pool (Kbytes) CDR_EVALTHREADS 1,2 # evaluator threads (per-cpu- vp,additional) CDR_DSLOC