RE: Performance advice
AIX4 (and possibly AIX5 too) indeed limits the number of shared segments
any one process may own, i think it's in the region of 11. Shared mem
segments are 256MB in size, so Informix can only use about 2.5GB of the
8GB you have. You need to try and align your memory sizes to 256MB
boundaries to get the max.
We did away with shared mem connections so we don't have a comms segment
- even it is quite small it takes one of the 11'ish possible segments:
$ onstat -g seg
...Segment Summary:
id key addr size ovhd class blkused blkfree
22 1381386241 30000000 2110128128 51900 R 257580 4
23 1381386242 b0000000 512000000 8420 V 8714 53786
Total: - - 2622128128 - - 266294 53790
And yes, up your buffers.
"Buffers, buffers, it's all about buffers..." :-)
-------------------------------------------
Willem Roos - (+27) 21 980 4941
Per sercas vi malkovri
> -----Original Message-----
> From: owner-informix-list@iiug.org
> [mailto:owner-informix-list@iiug.org] On Behalf Of Paul Watson
> Sent: 19 April 2004 17:12
> To: informix-list@iiug.org
> Subject: Re: Performance advice
>
>
> Try increasing the buffers and monitoring onstat -p, if you are
> allocating additional segments (onstat -g seg) then up your
> shmvirtsize.
> AIX has (had??) a hard limit of 10 segments for any process
>
> sumGirl wrote:
> >
> > Hi all! Throwing myslef on your mercy here - I have a RS6000 with 4
> > processors running IDS 9.40.FC2 and I just went from 1 gig of memory
> > to 8 gig.
> >
> > I am wondering how I should edit my onconfig for
> performance - to both
> > take advantage of the new memory and make up for past
> flubbishness of
> > other admins. I know this is probably a lot to ask, but I am really
> > not up to speed yet on IDS (but I am working on it!)
> >
> > Thanks in advance for your patience and wisdom!
> >
> >
> #*************************************************************
> *************
> > #
> > # INFORMIX SOFTWARE, INC.
> > #
> > # Title: onconfig.std
> > # Description: Informix Dynamic Server 2000 Configuration
> Parameters
> > #
> >
> #*************************************************************
> *************
> > # 11/05/2002 Decreased tapesize param from 21G to 15G due to failure
> > of
> > # ontape backup. BGF> >
> #*************************************************************
> *************
> >
> > # Root Dbspace Configuration
> >
> > ROOTNAME rootdbs # Root dbspace name
> > ROOTPATH /dev/rootdbs # Path for device containing root> > dbspace
> > ROOTOFFSET 128 # Offset of root dbspace into device
> > (Kbytes)
> > ROOTSIZE 499872 # Size of root dbspace (Kbytes)> >
> > # Disk Mirroring Configuration Parameters
> >
> > MIRROR 0 # Mirroring flag (Yes = 1, No = 0)
> > MIRRORPATH # Path for device> containing mirrored
> > root
> > MIRROROFFSET 0 # Offset into mirrored
> device (Kbytes)> >
> > # Physical Log Configuration
> >
> > PHYSDBS physdbs_new # Location (dbspace) of physical log
> > PHYSFILE 199000 # Physical log file size (Kbytes)> >
> > # Logical Log Configuration
> >
> > DYNAMIC_LOGS 2
> > LOGFILES 120 # Number of logical log files
> > LOGSIZE 1000 # Logical log size (Kbytes)> >
> > # Diagnostics
> >
> > MSGPATH /u/informix/online.log # System message log
> file path
> > CONSOLE /dev/console # System console message path
> > ##ALARMPROGRAM /u/informix/etc/log_full.sh # Alarm program path
> > ALARMPROGRAM /u/informix/etc/no_log.sh # Alarm program path
> > TBLSPACE_STATS 1 # Maintain tblspace statistics> >
> > # System Archive Tape Device
> > # testdev:
> > TAPEDEV scout:/dev/rmt0 # Tape device path
> > #TAPEDEV /dev/null # Tape device path
> > TAPEBLK 256 # Tape block size (Kbytes)
> > TAPESIZE 15000000 # Maximum amount of data to put on
> > tape (Kbytes)
> > #TAPESIZE 21000000 # Maximum amount of> data to put on tape (Kbytes)
> >
> > # Log Archive Tape Device
> >
> > #LTAPEDEV /dev/null # Log tape device path
> > # LTAPEDEV /archive/informix_backup/ll # Log tape device path
> > LTAPEDEV /dbwork/informix_backup/ll # Log tape device path
> > LTAPEBLK 1024 # Log tape block size (Kbytes)
> > LTAPESIZE 2000000 # Max amount of data to put on log
> > tape (Kbytes)> >
> > # Optical
> >
> > STAGEBLOB # Informix Dynamic Server
> 2000 staging
> > area
> >
> > # System Configuration
> >
> > SERVERNUM 1 # Unique id corresponding> to a OnLine
> > instance
> > DBSERVERNAME dbscout # Name of default database server
> > DBSERVERALIASES dbscouttcp # List of alternate dbservernames
> > NETTYPE soctcp,2,150,CPU
> > NETTYPE ipcshm,2,150,NET> > #NETTYPE soctcp,,,NET # Configure
> poll thread(s) for nettype
> > #NETTYPE ipcshm,2,150,CPU #
> Configure poll thread(s) for nettype
> > DEADLOCK_TIMEOUT 60 # Max time to wait of lock in> > distributed env.
> > RESIDENT 0 # Forced residency flag
> (Yes = 1, No =
> > 0)
> >
> > MULTIPROCESSOR 1 # 0 for single-processor, 1 for> > multi-processor
> >
> > NUMCPUVPS 3 # Number of user (cpu) vps> > #NUMCPUVPS 1 # Number of user (cpu) vps
> >
> > SINGLE_CPU_VP 0 # If non-zero, limit number> of cpu vps
> > to one
> >
> > NOAGE 1 # 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 150000 # Maximum number of shared buffers
> > NUMAIOVPS 2 # Number of IO vps
> > PHYSBUFF 128 # Physical log buffer size (Kbytes)
> > LOGBUFF 64 # Logical log buffer size (Kbytes)
> > CLEANERS 64 # Number of buffer cleaner processes
> > SHMBASE 0x700000000000000 # Shared memory base address
> > SHMVIRTSIZE 1048576 # initial virtual shared memory> > segment size
> > #SHMVIRTSIZE 400000 # -x- # initial virtual shared memory
> > segment size
> > SHMADD 163840 # Size of new shared memory segments
> > (Kbytes)
> > SHMTOTAL 7864320
> > #SHMTOTAL 0 # -x- # Total shared memory (Kbytes).
> > 0=>unlimited
> > CKPTINTVL 1800 # Check point interval (in sec)
> > LRUS 64 # Number of