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DB2 high CPU

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Operating Systems AIX DB2 high CPU
# 8  
Old 08-16-2010
I will do the configs tomorrow... you are very clever thanks a lot

---------- Post updated at 08:39 AM ---------- Previous update was at 08:02 AM ----------

well I changed these parameters and untill we started DB2 I run the command:
Code:
vmstat -v
              6291456 memory pages
              6091921 lruable pages
              5077989 free pages
                    3 memory pools
               370646 pinned pages
                 80.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                  1.2 numperm percentage
                76542 file pages
                  0.0 compressed percentage
                    0 compressed pages
                  1.2 numclient percentage
                 90.0 maxclient percentage
                76542 client pages
                    0 remote pageouts scheduled
                    0 pending disk I/Os blocked with no pbuf
                    0 paging space I/Os blocked with no psbuf
                 2484 filesystem I/Os blocked with no fsbuf 
                  650 client filesystem I/Os blocked with no fsbuf
                    0 external pager filesystem I/Os blocked with no fsbuf

as we see the 2484 filesystem I/Os blocked with no fsbuf
 is still present... I will try to read about fsbuf and try find out why I have these i/o blocks
# 9  
Old 08-16-2010
I am not sure if there is not just an intial impact that might occure just because of intense traffic when starting up everything after a boot. I would tend to monitor those counters if they increase in normal day work, especially after peak times.

Anyway it is good to read tuning guides, IBM Redbooks about performance, Jaqui Lynch's articles about tuning etc. Also the man page on ioo is very interesting.
This User Gave Thanks to zaxxon For This Post:
Vit0_Corleone
# 10  
Old 08-18-2010
Quote:
Originally Posted by zaxxon
Code:
ioo -p -o j2_dynamicBufferPreallocation=32

Default is 16. This is dynamic so remount is needed. If the counter still increases rather quick, you can do additionally:
Excuse me, but I still learn
How do you know that Vit0_Corleone use jfs2 and problem with it not other filesystem, maybe jfs?
Maybe, j2_dynamicBufferPreallocation can use for jfs too?
# 11  
Old 08-18-2010
As he said he is using AIX 6.1 I strongly doubt that he is using jfs. jfs is somewhat out of date and very limited. If he is using jfs, I strongly recommend changing that.
# 12  
Old 08-18-2010
john1212, zaxxon
Of course I am using JFS2.. And we use 100GB files for DB2 and these files are allocated in one partition that's why we have so big load.. We are waiting storage upgrade and than we will allocate DB2 containers to separate file systems.. I will post then result :-)
This User Gave Thanks to Vit0_Corleone For This Post:
zaxxon
# 13  
Old 08-18-2010
... for posting the result then Smilie
# 14  
Old 08-18-2010
Quote:
Originally Posted by Vit0_Corleone
well I changed these parameters and untill we started DB2 I run the command:
Code:
vmstat -v

as we see the 2484 filesystem I/Os blocked with no fsbuf
is still present... I will try to read about fsbuf and try find out why I have these i/o blocks
I think Vit0_Corleone writen "unill we started DB2" means "before we started DB2".
Hence my conclusion that the problem is not with DB2, and not with filesystems include db2.
I haven't yet written but this would be my request.
I'm sorry Vit0_Corleone, if I wrong read your message.

Very seriously.
I think
Code:
mvstat-v

at line:
filesystem I/Os blocked with no fsbuf
display a summary of the statistics Since boot.

If you interesing filesystems on SAN you ought to show statistics:
client filesystem I/Os blocked with no fsbuf
Last edited by john1212; 08-18-2010 at 07:54 AM..
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