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IDS Forum

Random Server Slowdown "Redone"

Posted By: JAVIER HERNáNDEZ
Date: Wednesday, 13 January 2010, at 11:01 a.m.

Hi,

In mid December I posted about a problem we have with an instance slowing down at random times/days. Since that we upgraded the instance to IDS 11.5 64-bit to better use the hardware assigned to Informix.

Well, the problem has returned and neded assistance in solving the puzzle.

At random days/time we experience slow downs in the responce of the instance, checking the processor utilization shows no problem 10% average (spikes of 100% util in 1 or 2 processor of 4)and there is plenty of available memory (the server has 8GB and IDS is consuming no more the 3GB), the most strange issue is that we are monitoring this server with OAT v2.26 and when the slow down occurs it can't connect, also, the production environment is using a mix of clients: Oracle Application server, a compiled .NET app using ODBC (8 Machines).

The maximun number of conections we have seen is 370.

Below I include some info about the server that can be of interest.

My server is using RedHat 4 ES update 5
[informix@saih respaldo_conf]$ uname -a
Linux saih.inr.gob.mx 2.6.9-55.ELsmp #1 SMP Fri Apr 20 16:36:54 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

We are using IDS 11.5 FC5
[informix@saih respaldo_conf]$ onstat -

IBM Informix Dynamic Server Version 11.50.FC5 -- On-Line -- Up 14:44:21 -- 3296300 Kbytes

[informix@saih ~]$ onstat -p

IBM Informix Dynamic Server Version 11.50.FC5 -- On-Line -- Up 15:02:58 -- 3296300 Kbytes

Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
803051 5116508 1317398798 99.94 863679 1063515 7082328 87.97

isamtot open start read write rewrite delete commit rollbk
974690064 1029061 1914834 937852565 2519305 12637 73794 8051 4

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 3512.02 49.25 302 151

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
58848 2 2656077359 0 0 1 19463 70959

ixda-RA idx-RA da-RA RA-pgsused lchwaits
32181 2342 400009 434365 46228

And finaly I include an edited copy of my onconfig (to remove comments)

ROOTNAME rootdbs
ROOTPATH $INFORMIXDIR/liga_dbspaces/dbs_rootweb
ROOTOFFSET 0
ROOTSIZE 2008092
MIRROR 0
MIRRORPATH $INFORMIXDIR/tmp/demo_on.root_mirror
MIRROROFFSET 0
PHYSFILE 50000
PLOG_OVERFLOW_PATH $INFORMIXDIR/tmp
PHYSBUFF 128
LOGFILES 20
LOGSIZE 10000
DYNAMIC_LOGS 2
LOGBUFF 64
LTXHWM 70
LTXEHWM 80
MSGPATH $INFORMIXDIR/inrserver.log
CONSOLE $INFORMIXDIR/inrserver.con
TBLTBLFIRST 0
TBLTBLNEXT 0
TBLSPACE_STATS 1
DBSPACETEMP dbs_tempweb
SBSPACETEMP
SBSPACENAME
SYSSBSPACENAME
ONDBSPACEDOWN 2
SERVERNUM 0
DBSERVERNAME ol_inrserver
DBSERVERALIASES ol_inrservershm
NETTYPE ipcshm,1,50,NET
NETTYPE soctcp,3,150,NET
LISTEN_TIMEOUT 60
MAX_INCOMPLETE_CONNECTIONS 1024
FASTPOLL 1
MULTIPROCESSOR 1
VPCLASS cpu,num=4,noage
VPCLASS shm,num=1,noage
VPCLASS soc,num=3,noage
VP_MEMORY_CACHE_KB 0
SINGLE_CPU_VP 0
#VPCLASS aio,num=1
CLEANERS 4
AUTO_AIOVPS 1
DIRECT_IO 0
LOCKS 20000
DEF_TABLE_LOCKMODE page
RESIDENT 2
SHMBASE 0x44000000L
SHMVIRTSIZE 262144
SHMADD 32768
EXTSHMADD 32768
SHMTOTAL 0
SHMVIRT_ALLOCSEG 0,3
SHMNOACCESS
CKPTINTVL 300
AUTO_CKPTS 1
RTO_SERVER_RESTART 0
BLOCKTIMEOUT 3600
TXTIMEOUT 300
DEADLOCK_TIMEOUT 60
HETERO_COMMIT 0
TAPEDEV /dev/IBMtape0
TAPEBLK 32
TAPESIZE 0
LTAPEDEV /dev/null
LTAPEBLK 32
LTAPESIZE 0
BAR_ACT_LOG $INFORMIXDIR/tmp/bar_act.log
BAR_DEBUG_LOG $INFORMIXDIR/tmp/bar_dbug.log
BAR_DEBUG 0
BAR_MAX_BACKUP 0
BAR_RETRY 1
BAR_NB_XPORT_COUNT 20
BAR_XFER_BUF_SIZE 31
RESTARTABLE_RESTORE ON
BAR_PROGRESS_FREQ 0
BAR_BSALIB_PATH
BACKUP_FILTER
RESTORE_FILTER
BAR_PERFORMANCE 0
ISM_DATA_POOL ISMData
ISM_LOG_POOL ISMLogs
DD_HASHSIZE 31
DD_HASHMAX 10
DS_HASHSIZE 31
DS_POOLSIZE 127
PC_HASHSIZE 31
PC_POOLSIZE 127
STMT_CACHE 0
STMT_CACHE_HITS 0
STMT_CACHE_SIZE 512
STMT_CACHE_NOLIMIT 0
STMT_CACHE_NUMPOOL 1
USEOSTIME 0
STACKSIZE 128
ALLOW_NEWLINE 0
USELASTCOMMITTED NONE
FILLFACTOR 90
MAX_FILL_DATA_PAGES 0
BTSCANNER num=1,threshold=5000,rangesize=-1,alice=6,compression=default
ONLIDX_MAXMEM 5120
MAX_PDQPRIORITY 20
DS_MAX_QUERIES
DS_TOTAL_MEMORY 2048
DS_MAX_SCANS 1048576
DS_NONPDQ_QUERY_MEM 512
DATASKIP
OPTCOMPIND 2
DIRECTIVES 1
EXT_DIRECTIVES 0
OPT_GOAL -1
IFX_FOLDVIEW 0
AUTO_REPREPARE 1
RA_PAGES 64
RA_THRESHOLD 16
EXPLAIN_STAT 1
SQLTRACE level=med,ntraces=5000,size=10240,mode=global
#DBCREATE_PERMISSION informix
#DB_LIBRARY_PATH
IFX_EXTEND_ROLE 1
SECURITY_LOCALCONNECTION
UNSECURE_ONSTAT
ADMIN_USER_MODE_WITH_DBSA
ADMIN_MODE_USERS
SSL_KEYSTORE_LABEL
PLCY_POOLSIZE 127
PLCY_HASHSIZE 31
USRC_POOLSIZE 127
USRC_HASHSIZE 31
STAGEBLOB
OPCACHEMAX 0
ENCRYPT_HDR
ENCRYPT_SMX
ENCRYPT_CDR 0
ENCRYPT_CIPHERS
ENCRYPT_MAC
ENCRYPT_MACFILE
ENCRYPT_SWITCH
CDR_EVALTHREADS 1,2
CDR_DSLOCKWAIT 5
CDR_QUEUEMEM 4096
CDR_NIFCOMPRESS 0
CDR_SERIAL 0
CDR_DBSPACE
CDR_QHDR_DBSPACE
CDR_QDATA_SBSPACE
CDR_MAX_DYNAMIC_LOGS 0
CDR_SUPPRESS_ATSRISWARN
DRAUTO 0
DRINTERVAL 30
DRTIMEOUT 30
HA_ALIAS
DRLOSTFOUND $INFORMIXDIR/etc/dr.lostfound
DRIDXAUTO 0
LOG_INDEX_BUILDS
SDS_ENABLE
SDS_TIMEOUT 20
SDS_TEMPDBS
SDS_PAGING
UPDATABLE_SECONDARY 0
FAILOVER_CALLBACK
TEMPTAB_NOLOG 0
DELAY_APPLY 0
STOP_APPLY 0
LOG_STAGING_DIR
ON_RECVRY_THREADS 1
OFF_RECVRY_THREADS 10
DUMPDIR $INFORMIXDIR/tmp
DUMPSHMEM 1
DUMPGCORE 0
DUMPCORE 0
DUMPCNT 1
ALARMPROGRAM $INFORMIXDIR/etc/alarmprogram.sh
ALRM_ALL_EVENTS 0
STORAGE_FULL_ALARM 600,3
SYSALARMPROGRAM $INFORMIXDIR/etc/evidence.sh
RAS_PLOG_SPEED 25000
RAS_LLOG_SPEED 0
EILSEQ_COMPAT_MODE 0
QSTATS 0
WSTATS 0
#VPCLASS jvp,num=1
JVPJAVAHOME $INFORMIXDIR/extend/krakatoa/jre
JVPHOME $INFORMIXDIR/extend/krakatoa
JVPPROPFILE $INFORMIXDIR/extend/krakatoa/.jvpprops
JVPLOGFILE $INFORMIXDIR/jvp.log
#JDKVERSION 1.5
JVPJAVALIB /bin/j9vm
JVPJAVAVM jvm
#JVPARGS -verbose:jni
#JVPCLASSPATH $INFORMIXDIR/extend/krakatoa/krakatoa_g.jar:$INFORMIXDIR/extend/krakatoa/jdbc_g.jar
JVPCLASSPATH $INFORMIXDIR/extend/krakatoa/krakatoa.jar:$INFORMIXDIR/extend/krakatoa/jdbc.jar

BUFFERPOOL default,buffers=10000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.500000
BUFFERPOOL size=2K,buffers=1200000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.000000
AUTO_LRU_TUNING 1

Hope you can help me.

Javier Hernández

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