Performance issues on HP-UX

We are currently suffering performance problems with our Informix server running on HP-UX. The server appears to be paging heavily with sar -q showing %swpocc running at or close to 100. The server is an HP 9000/800 with 1Gb RAM, running: IBM Informix Dynamic Server Version 7.31.FD8 HPUX Version B.11.11 At startup the online.log shows: 13:25:00 Segment locked: addr=0x5c5000, size=411049984 13:25:00 Segment locked: addr=0x18dc7000, size=115343360 13:25:01 The number of configured CPU poll threads exceeds 'NUMCPUVPS'. NETTYPE 'live_sm' poll threads started on NET VPs. In our onconfig we have: NETTYPE ipcshm,2,150,CPU NETTYPE soctcp,1,100,NET NUMCPUVPS 1 >From the error message and googling I suppose we need to set NUMCPUVPS to 2 (it is a dual processor machine). Some sources suggest setting the vp class value to NET on a multi-processor machine. Is that the way to go or should we stick with CPU? Additionally we are seeing occasional Network recieve errors in the online.log and clients' telnet sessions are dropping with TCP errors. However the dropped sessions do not always correspond to the Network recieve errors in the logs: 12:00:37 listener-thread: err = -25587: oserr = 0: errstr = : Network receive failed. Finally we are also seeing: 11:56:41 shmctl: errno = 12 11:56:41 Shared memory segment 0xc00000001ffaf000 could not be forced resident. 11:57:03 hpkaioaddseg: ASYNC_ADDSEG failed, errno = 11 Resource temporarily unavailable 11:57:05 shmctl: errno = 12 With regards the latter we have tried upping IFMX_HPKAIO_NUM_REQ to 3000 but that does not appear to have helped. Can anyone give us any pointers to resolving these issues? Although performance is an issue, the most urgent thing for us at the moment is stop the dropped sessions. Our onconfig follows: # Root Dbspace Configuration ROOTNAME rootdbs # Root dbspace name ROOTPATH /opt/informix/chunks/c_root # Path for device containing root dbspace ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes) ROOTSIZE 204800 # 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 dbs_plog # Location (dbspace) of physical log PHYSFILE 24400 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 50 # Number of logical log files LOGSIZE 4000 # Logical log size (Kbytes) # Diagnostics MSGPATH /var/informix/logs/online.log # System message log file path CONSOLE /dev/console # System console message path ALARMPROGRAM /opt/informix/current/etc/log_full.sh # Alarm programpath SYSALARMPROGRAM /opt/informix/current/etc/evidence.sh # System Alarm program path TBLSPACE_STATS 1 # System Archive Tape Device TAPEDEV /dev/rmt/1m # Tape device path #TAPEDEV /dev/rmt/1m # Tape device path TAPEBLK 128 # Tape block size (Kbytes) TAPESIZE 10485760 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/null # 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 Dynamic Server/Optical staging area # System Configuration SERVERNUM 3 # Unique id corresponding to a DynamicServer instance DBSERVERNAME live_sm # Name of default database server DBSERVERALIASES live_tcp # List of alternate dbservernames NETTYPE ipcshm,2,150,CPU # Override sqlhosts nettype parameters NETTYPE soctcp,1,100,NET # Override sqlhosts nettype parameters DEADLOCK_TIMEOUT 60 # Max time to wait of lock indistributed env. RESIDENT -1 # Forced residency flag (Yes = 1, No = 0, -1 = Yes and merge) MULTIPROCESSOR 1 # 0 for single-processor, 1 formulti-processor NUMCPUVPS 1 # Number of user (cpu) vps SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vpsto one NOAGE 1 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors # Shared Memory Parameters LOCKS 500000 # Maximum number of locks BUFFERS 163840 # Maximum number of shared buffers (Pages) NUMAIOVPS 4 # Number of IO vps PHYSBUFF 32 # Physical log buffer size (Kbytes) LOGBUFF 32 # Logical log buffer size (Kbytes)LOGSMAX 50 # Maximum number of logical log files CLEANERS 58 # Number of buffer cleaner processes SHMBASE 0x0 # Shared memory base address SHMVIRTSIZE 112640 # initial virtual shared memory segmentsize SHMADD 81920 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 150 # Check point interval (in sec) LRUS 57 # Number of LRU queues LRU_MAX_DIRTY 10 # LRU percent dirty begin cleaninglimit LRU_MIN_DIRTY 5 # 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 - Dynamic Server no longer supports this configuration parameter. # To determine the page size used by Dynamic Server 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 /opt/informix/current/etc/dr.lostfound # DR lost+found@@NL