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IDS Forum

IO performance issues

Posted By: R MICHAEL
Date: Thursday, 8 December 2016, at 5:47 a.m.

I'm opening this thread because of some IO performance issues that I have now and need to be sure of what I must do.

This is my db profile counts:Profile
dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
22906487 87848814 34363980245 99.93 332057743 398328761 1082072410 69.31

isamtot open start read write rewrite delete commit rollbk
48406998458 7423608018 9188986012 10875359326 1488886 347373130 682316 347179506 1

gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
1487097310 353965214 343076548 4397605 4723657 2 18018239

ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
0 0 0 457810.60 98673.63 3364 7580

bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
541933 6627626 13923560081 0 0 29422 1170160 807177

ixda-RA idx-RA da-RA logrec-RA RA-pgsused lchwaits
70449 9643446 760355 1294 18020622 137838512

Onconfig:
NETTYPE soctcp,1,200,NET
LISTEN_TIMEOUT 60
MAX_INCOMPLETE_CONNECTIONS 1024
FASTPOLL 1
NUMFDSERVERS 4
NS_CACHE host=900,service=900,user=900,group=900

MULTIPROCESSOR 1
VPCLASS cpu,num=12,noage
VP_MEMORY_CACHE_KB 0
SINGLE_CPU_VP 0
CLEANERS 8
DIRECT_IO 1
LOCKS 20000
DEF_TABLE_LOCKMODE page
RESIDENT 0
SHMBASE 0x44000000L
SHMVIRTSIZE 10485760
SHMADD 262144
EXTSHMADD 51200
SHMTOTAL 62914560
SHMVIRT_ALLOCSEG 0,3
SHMNOACCESS
MAX_PDQPRIORITY 100
DS_MAX_QUERIES
DS_TOTAL_MEMORY
DS_MAX_SCANS 1048576
DS_NONPDQ_QUERY_MEM 256
DATASKIP
BUFFERPOOL default,buffers=10000,lrus=8,lru_min_dirty=50,lru_ max_dirty=60.5
BUFFERPOOL size=2K
BUFFERPOOL size=8K

onstat -P
Percentages:
Data 55.67
Btree 8.09
Other 36.24

onstat -F

Fg Writes LRU Writes Chunk Writes
2 611239 14997845

address flusher state data # LRU Chunk Wakeups Idle Tim
4c3e48e8 0 I 0 603 10296 1021956 1010204.637
4c3e51a8 1 I 0 707 9448 1021391 1009724.104
4c3e5a68 2 I 0 627 7475 1019552 1010959.875
4c3e6328 3 I 0 873 4565 1017161 1011482.790
4c3e6be8 4 I 0 742 7209 1019094 1010744.211
4c3e74a8 5 I 0 727 6145 1018085 1010709.286
4c3e7d68 6 I 0 858 7217 1019100 1010542.952
4c3e8628 7 I 0 773 6640 1018665 1010826.101
states: Exit Idle Chunk Lru

The machine on which DB runs has 16 cpus and 64 GB of RAM.

These values are not configured by me.

Any ideeas ?

Thanks.

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