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IDS Forum

7.31UD8 improve Êch writes

Posted By: Meza, Silvana
Date: Friday, 11 February 2005, at 11:46 a.m.


Sorry this is sooo lengthy but I'm hoping someone can help me out.

What can I possibly do to increase me write cached or am I at my limit with
the onconfigure variables?
I've called IBM/Informix and really haven't gotten any major results. I
don't have a very good clear understanding of how to improve performance.

We have an OLTP system, for a warehouse inventory system written in
acucobol. Most of the users use RF hand held units. We have 3 servers. 2
servers are for the client to connect to the 3rd server that has IDS
7.31UD8. This system interacts with other hardware such as conveyers,
mainframe, shipping and receiving hardware/software...etc...

I've included onstat -p, onstat -m, parts of onconfigure,
iostat -t 5 2 output, and vmstat 5 2 output.


Any help is MUCH appreciated.....




IBM Informix Dynamic Server Version 7.31.UD8 -- On-Line -- Up 09:33:05
-- 20
78160 Kbytes

Profile
dskreads pagreads bufreads Êched dskwrits pagwrits bufwrits Êched
187419 113912 47985457 99.61 656766 515479 1605114 59.08

isamtot open start read write rewrite delete commit
rollbk
41629051 855487 1764002 29942067 131147 124025 45722 49773 1

gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
0 0 0 0 0 0 0

ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 0 9289.14 6030.34 23 46

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
10745 433 54628754 0 0 1000 25945 5673

ixda-RA idx-RA da-RA RA-pgsused lchwaits
9442 5329 12105 26084 147062




Message Log File: /usr/informix/fcrpr_ol.log
08:59:04 Checkpoint loguniq 377558, logpos 0x254018

08:59:36 Logical Log 377558 Complete.
08:59:39 Logical Log 377558 - Backup Started
08:59:52 Logical Log 377558 - Backup Completed
09:01:02 Logical Log 377559 Complete.
09:01:06 Logical Log 377559 - Backup Started
09:01:12 Logical Log 377559 - Backup Completed
09:02:39 Logical Log 377560 Complete.
09:02:42 Logical Log 377560 - Backup Started
09:02:54 Logical Log 377560 - Backup Completed
09:03:49 Checkpoint Completed: duration was 12 seconds.
09:03:49 Checkpoint loguniq 377561, logpos 0x287018

09:04:23 Logical Log 377561 Complete.
09:04:24 Logical Log 377561 - Backup Started
09:04:36 Logical Log 377561 - Backup Completed
09:06:05 Logical Log 377562 Complete.
09:06:06 Logical Log 377562 - Backup Started
09:06:19 Logical Log 377562 - Backup Completed


SERVERNUM 3 # Unique id corresponding to online instance
DBSERVERNAME fcrpr_ol # Name of default database server
DBSERVERALIASES fcr_rs6000_ol # List of alternate dbservernames
NETTYPE ipcshm,1,100,CPU # Configure poll thread(s) for nettype
NETTYPE soctcp,3,150,NET # 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-processo
NUMCPUVPS 6 # 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 500000 # Max number of locks
#BUFFERS 341250 # Max # of shared buffers (x 4k
pages=kbytes)
BUFFERS 358312 # Max # of shared buffers (x 4k
pages=kbytes)
NUMAIOVPS 2 # Number of IO vps
PHYSBUFF 32 # Physical log buffer size (Kbytes)
LOGBUFF 32 # Logical log buffer size (Kbytes)
LOGSMAX 80 # Maximum number of logical log files
Standard input
CLEANERS 120 # Number of buffer cleaner processes
SHMBASE 0x30000000 # Shared memory base address
SHMVIRTSIZE 576000 # initial virtual shared memory segment size
SHMADD 96000 # Size of new shared memory segments
(Kbytes)
SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited
CKPTINTVL 300 # Check point interval (in sec)
LRUS 100 # Number of LRU queues (max 128)
# MAX AND MIN should never have the same values
LRU_MAX_DIRTY 2 # LRU percent dirty begin cleaning limit
LRU_MIN_DIRTY 1 # LRU percent dirty end cleaning limit
LTXHWM 40 # Long transaction high water mark
percentage
LTXEHWM 50 # Long transaction high water mark
(exclusive)
TXTIMEOUT 0x258 # 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'.



# Parallel Database Queries (pdq)
MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority
DS_MAX_QUERIES # Maximum number of decision support queries
DS_TOTAL_MEMORY # Decision support memory (Kbytes)
DS_MAX_SCANS 1048576 # Maximum number of decision support scans
DATASKIP off # List of dbspaces to skip



output from instat -t 5 2:
Fri Feb 11 09:26:39 CST 2005

tty: tin tout avg-cpu: % user % sys % idle %
iowait
0.1 5.6 8.6 6.7 84.6 0.1
0.0 0.0 17.8 16.7 65.4 0.1
~

output from vmstat 5 2
Fri Feb 11 09:27:53 CST 2005
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
2 1 569606 14160 0 0 0 0 4 0 1329 3010 1947 9 7 85 0
2 0 569613 14154 0 0 0 0 0 0 1863 6721 3923 21 18 62 0
~




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