Re: long checkpoints
Lower your LRU min and max for starters. That will reduce the volume of
dirty pages that have to be written out as part of the checkpoint process. I
would suggest you try 4/2 as a starting point.
Mark
----- Original Message -----
From: "tomL" <schmotom@yahoo.com>
To: <informix-list@iiug.org>
Sent: Thursday, June 05, 2003 11:53
Subject: long checkpoints
> hello all,
> we have recently experienced checkpoints that are lasting 20-30
> seconds that were previously 5-8 seconds.
> I am looking at the CONFIG file to see if something could be improved.
> We are on HP-UNIX box (11.00)(2 proc box) with Informix 9.21 HC-5.
>
> BUFFERS 250000 # Maximum number of shared buffers
> NUMAIOVPS 2 # Number of IO vps
> PHYSBUFF 32 # Physical log buffer size (Kbytes)
> LOGBUFF 32 # Logical log buffer size (Kbytes)> LOGSMAX 40 # Maximum number of logical log files
> CLEANERS 50 # Number of buffer cleaner processes
> LRUS 50 # Number of LRU queues
> LRU_MAX_DIRTY 30 # LRU percent dirty begin cleaning> limit
> LRU_MIN_DIRTY 25 # LRU percent dirty end cleaning limit
> CKPTINTVL 300 # Check point interval (in sec)
> MULTIPROCESSOR 1 # 0 for single-processor, 1 for> multi-processor
> NUMCPUVPS 2 # Number of user (cpu) vps
> SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps> to one
> LTXHWM 50 # Long transaction high water mark> percentage
> LTXEHWM 60 # Long transaction high water mark
> (exclusive)>
> KAIO is enabled.
>
> thanks for any help......