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Operating Systems AIX CPU performance
# 8  
Old 01-04-2017
A couple of observations to add to this thread:
  • In post #2 a high %iowait was implied, but it is only 5% in the vmstat output.
  • Active memory use avm (without filesystem caching / buffers) is 80GiB. So this is mainly caused by the database and the application combined.
  • fr:sr is only 1:2.2 so the system appears to have no problem freeing the memory that it requires.
  • fi+fo>fre, and fi is roughly equal to fr, so it appears to be mainly caused by filesystem I/O that needs to be placed somewhere in memory.
  • Perhaps we are looking at filesystem cache which has not been curtailed (left at unlimited setting), is what is causing this. Typically with cooked filesystems, filesystem buffers should be kept in check (only enough for I/O optimization) as the database typically is better at handling the caching / buffering. Perhaps it is the application that is causing this...
  • The system is reading at 0.5 GiB/s. So - as Bakunin already remarked -if there was no backup or similar activity at the moment the vmstat was produced and if this can be ascribed to database activity, then this would probably be due to sequential read I/O. If this is not expected behaviour, then perhaps the database or the application should be tuned. If that is the case, then I would be inclined to expect the SGA would need to be increased, rather than decreased. But this is speculation of course until this is properly researched. The I/O may also be network I/O caused by the application for example..
  • The output of iostat does not show high numbers, so maybe we are looking at network I/O?
  • The ps output, you left out the labels, so it is not clear what the numbers mean and also what "top 20" entails
Last edited by Scrutinizer; 01-04-2017 at 06:45 AM..
This User Gave Thanks to Scrutinizer For This Post:
agent.kgb
# 9  
Old 01-05-2017
Hello,

There is not backup process. The network output and ps output as below.

Code:
 root@ABRO-DB/#ps -Alo pid,vsz,args | sort -rnk 2 |head -30
64161024 1400968 oraclefinabrodb (LOCAL=NO)
38143450 292976 /oemdata/agent_software/core/1.10.0/oracle_common/jdk/bin/java -Xmx172M -server -Djava.security.egd=file:///dev/./urandom -Dsun.lang.ClassLoader.allowArraySyntax=true -Xgcpolicy:gencon -Dhttps.protocols=TLS -Dwatchdog.pid=34866428 -cp /oemdata/agent_software/core/1.10.0/jdbc/lib/ojdbc7.jar:/oemdata/agent_software/core/1.10.0/ucp/lib/ucp.jar:/oemdata/agent_software/core/1.10.0/oracle_common/modules/jsch-0.1.51.jar:/oemdata/agent_software/core/1.10.0/oracle_common/modules/com.oracle.http_client.http_client_12.1.3.jar:/oemdata/agent_software/core/1.10.0/oracle_common/modules/oracle.xdk_12.1.3/xmlparserv2.jar:/oemdata/agent_software/core/1.10.0/oracle_common/modules/oracle.dms_12.1.3/dms.jar:/oemdata/agent_software/core/1.10.0/oracle_common/modules/oracle.odl_12.1.3/ojdl.jar:/oemdata/agent_software/core/1.10.0oracle_common/modules/oracle.odl_12.1.3/ojdl2.jar:/oemdata/agent_software/core/1.10.0/lib/optic.jar:/oemdata/agent_software/core/1.10.0/sysman/jlib/log4j-core.jar:/oemdata/agent_software/core/1.10.0/jlib/gcagent_core.jar:/oemdata/agent_software/core/1.10.0/sysman/jlib/emagentSDK-intg.jar:/oemdata/agent_software/core/1.10.0/sysman/jlib/emagentSDK.jar oracle.sysman.gcagent.tmmain.TMMain
32245454 237240 /oemdata/agent12c/core/12.1.0.4.0/jdk/bin/java -Xmx318M -server -Djava.security.egd=file:///dev/./urandom -Dsun.lang.ClassLoader.allowArraySyntax=true -Xgcpolicy:gencon -Dwatchdog.pid=1246384 -cp /oemdata/agent12c/core/12.1.0.4.0/jdbc/lib/ojdbc5.jar:/oemdata/agent12c/core/12.1.0.4.0/ucp/lib/ucp.jar:/oemdata/agent12c/core/12.1.0.4.0/modules/oracle.http_client_11.1.1.jar:/oemdata/agent12c/core/12.1.0.4.0/lib/xmlparserv2.jar:/oemdata/agent12c/core/12.1.0.4.0/lib/jsch.jar:/oemdata/agent12c/core/12.1.0.4.0/lib/optic.jar:/oemdata/agent12c/core/12.1.0.4.0/modules/oracle.dms_11.1.1/dms.jar:/oemdata/agent12c/core/12.1.0.4.0/modules/oracle.odl_11.1.1/ojdl.jar:/oemdata/agent12c/core/12.1.0.4.0/modules/oracle.odl_11.1.1/ojdl2.jar:/oemdata/agent12c/core/12.1.0.4.0/sysman/jlib/log4j-core.jar:/oemdata/agent12c/core/12.1.0.4.0/jlib/gcagent_core.jar:/oemdata/agent12c/core/12.1.0.4.0/sysman/jlib/emagentSDK-intg.jar:/oemdata/agent12c/core/12.1.0.4.0/sysman/jlib/emagentSDK.jar oracle.sysman.gcagent.tmmain.TMMain
10617204 199992 /usr/sbin/rsct/bin/IBM.HostRMd
13960796 128108 /usr/bin/topas_nmon  -f -t -d -A -O -L -N -P -V -T -^ -s 30 -c 720 -m /perfdata/nmon -youtput_dir=/perfdata/nmon/CORE-DB -ystart_time=06:00:01,Jan05,2017
11075996 123400 ora_arcd_finabrodb
 3605070 121672 ora_arcb_finabrodb
12845242 111432 ora_arca_finabrodb
 7864702 105544 ora_arch_finabrodb
11600338 104776 ora_arc6_finabrodb
11075588 103816 ora_arc8_finabrodb
 4981288 99080 ora_arc0_finabrodb
10879398 98952 ora_arc9_finabrodb
 9437556 98760 ora_arcc_finabrodb
 7537316 89096 ora_arci_finabrodb
18022482 88648 ora_arc4_finabrodb
 8847704 86664 ora_arcg_finabrodb
14155902 86280 ora_arcf_finabrodb
 4129490 85832 ora_arcj_finabrodb
 9568356 84040 ora_arc7_finabrodb
 7209628 83464 ora_arc5_finabrodb
 8061550 77768 ora_arc2_finabrodb
 3277356 74176 /usr/java6/bin/java -Xmx512m -Xms20m -Xscmx10m -Xshareclasses -Xbootclasspath/p:/usr/java5/jre/lib/ibmjsseprovider2.jar -Dfile.encoding=UTF-8 -Xbootclasspath/p:/usr/java5/jre/lib/ibmjsseprovider2.jar -Xbootclasspath/a:/pconsole/lwi/runtime/core/eclipse/plugins/com.ibm.rcp.base_6.2.1.20091117-1800/rcpbootcp.jar:/pconsole/lwi/lib/ISCJaasModule.jar:/pconsole/lwi/lib/com.ibm.logging.icl_1.1.1.jar:/pconsole/lwi/lib/jaas2zos.jar:pconsole/lwi/lib/jaasmodule.jar:/pconsole/lwi/lib/lwinative.jar:/pconsole/lwi/lib/lwinl.jar:/pconsole/lwi/lib/lwirolemap.jar:/pconsole/lwi/lib/lwisecurity.jar:/pconsole/lwi/lib/lwitools.jar:/pconsole/lwi/lib/passutils.jar -Xverify:none -cp eclipse/launch.jar:eclipse/startup.jar:/pconsole/lwi/runtime/core/eclipse/plugins/com.ibm.rcp.base_6.2.1.20091117-1800/launcher.jar com.ibm.lwi.LaunchLWI
18546830 67848 ora_arce_finabrodb
37094778 59784 oraclefinabrodb (LOCAL=NO)
 6226442 56136 ora_arc1_finabrodb
52233484 55112 ora_nsa2_finabrodb
12189796 46984 ora_arc3_finabrodb
 7864570 44268 /usr/es/sbin/cluster/clstrmgr
 3080534 43648 j2pg

==================================================
The network card stats

Code:
root@ABRO-DB/#netstat -v ent0
-------------------------------------------------------------
ETHERNET STATISTICS (ent0) :
Device Type: Virtual I/O Ethernet Adapter (l-lan)
Hardware Address: b2:51:b4:3b:20:0b
Elapsed Time: 88 days 4 hours 58 minutes 42 seconds

Transmit Statistics:                          Receive Statistics:
--------------------                          -------------------
Packets: 127202332052                         Packets: 98167235979
Bytes: 99027328638719                         Bytes: 46966446811491
Interrupts: 0                                 Interrupts: 51688301615
Transmit Errors: 0                            Receive Errors: 0
Packets Dropped: 0                            Packets Dropped: 0
                                              Bad Packets: 0
Max Packets on S/W Transmit Queue: 0
S/W Transmit Queue Overflow: 0
Current S/W+H/W Transmit Queue Length: 0

Broadcast Packets: 18288                      Broadcast Packets: 92360313
Multicast Packets: 4                          Multicast Packets: 0
No Carrier Sense: 0                           CRC Errors: 0
DMA Underrun: 0                               DMA Overrun: 0
Lost CTS Errors: 0                            Alignment Errors: 0
Max Collision Errors: 0                       No Resource Errors: 0
Late Collision Errors: 0                      Receive Collision Errors: 0
Deferred: 0                                   Packet Too Short Errors: 0
SQE Test: 0                                   Packet Too Long Errors: 0
Timeout Errors: 0                             Packets Discarded by Adapter: 0
Single Collision Count: 0                     Receiver Start Count: 0
Multiple Collision Count: 0
Current HW Transmit Queue Length: 0

General Statistics:
-------------------
No mbuf Errors: 0
Adapter Reset Count: 0
Adapter Data Rate: 20000
Driver Flags: Up Broadcast Running
        Simplex 64BitSupport ChecksumOffload
        DataRateSet VIOENT

Virtual I/O Ethernet Adapter (l-lan) Specific Statistics:
---------------------------------------------------------
RQ Length: 9025
Trunk Adapter: False
Filter MCast Mode: False
Filters: 255
  Enabled: 2  Queued: 0  Overflow: 0
LAN State: Operational

Hypervisor Send Failures: 0
  Receiver Failures: 0
  Send Errors: 0
Hypervisor Receive Failures: 0

Invalid VLAN ID Packets: 0

ILLAN Attributes: 000000000000B002 [000000000000A000]

Port VLAN ID:   140
VLAN Tag IDs:  None


Switch ID: ETHERNET0

Hypervisor Information
  Virtual Memory
    Total (KB)                150
  I/O Memory
    VRM Minimum (KB)          172
    VRM Desired (KB)          172
    DMA Max Min (KB)          256

Transmit Information
  Transmit Buffers
    Buffer Size             65536
    Buffers                    32
    History
      No Buffers                7
  Virtual Memory
    Total (KB)               2048
  I/O Memory
    VRM Minimum (KB)         2176
    VRM Desired (KB)        16384
    DMA Max Min (KB)        16384

Receive Information
  Receive Buffers
    Buffer Type              Tiny    Small   Medium    Large     Huge
    Min Buffers              2048     2048      256       64       64
    Max Buffers              4096     4096      512      128      128
    Allocated                2048     2063      271       64       64
    Registered               2047     2040      254       64       64
    History
      Max Allocated          2048     2280      362       74       64
      Lowest Registered      2046     2033      251       59       64
  Virtual Memory
    Minimum (KB)             1024     4096     4096     2048 4096
    Maximum (KB)             2048     8192     8192     4096     8192
  I/O Memory
    VRM Minimum (KB)        16384    16384     5120     2304     4352
    VRM Desired (KB)        32768    32768    10240     4608     8704
    DMA Max Min (KB)        32768    32768    16384     8192    16384

I/O Memory Information
  Total VRM Minimum (KB)    46892
  Total VRM Desired (KB)   105644
  Total DMA Max Min (KB)   123136

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Last edited by rbatte1; 01-05-2017 at 06:40 AM.. Reason: Don Cragun: Change ICODE tags to CODE tags and add ICODE tags.; rbatte1: Joined lines in output for clarity
# 10  
Old 01-06-2017
The system settings seem in shape so far.

You might also want to check with a DBA, if there are locks blocking requests that could cause the high values in the b column. I am not sure about that, just a guess.

Also could you please post the complete output of the following:
Code:
vmstat -v
iostat -A 1 10 | grep -p ^aio
lsfs

# 11  
Old 01-06-2017
dumb question. do you have
Code:
FILESYSTEMIO_OPTIONS=SETALL

in your init.ora?

and for reference a little bit old, but still useful paper from IBM - Oracle Architecture and Tuning on AIX
# 12  
Old 01-10-2017
Did you find out anything? Would be interesting.
# 13  
Old 01-11-2017
Code:
root@ABRO-DB/#vmstat -v
52428800 memory pages
             50897120 lruable pages
                52390 free pages
                   17 memory pools
              7087860 pinned pages
                 90.0 maxpin percentage
                  3.0 minperm percentage
                 90.0 maxperm percentage
                 60.1 numperm percentage
             30613697 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 60.1 numclient percentage
                 90.0 maxclient percentage
             30613697 client pages
                    0 remote pageouts scheduled
               200985 pending disk I/Os blocked with no pbuf
                    0 paging space I/Os blocked with no psbuf
                 2228 filesystem I/Os blocked with no fsbuf
                   73 client filesystem I/Os blocked with no fsbuf
                18038 external pager filesystem I/Os blocked with no fsbuf
                 41.5 percentage of memory used for computational pages

====================================================
Code:
root@ABRO-DB/#iostat -A 1 10 | grep -p ^aio
aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     41871.0  0.0   232     0    131072            43.6  16.0   36.4      4.0  14.2   88.7

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     39126.0  0.0   192     0    131072            44.5  14.4   37.9      3.2  14.4   89.7

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     30756.0  0.0   195     0    131072            45.2  14.0   37.9      2.9  14.7   91.7

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     27308.0  0.0   243     0    131072            48.4  13.3   34.8      3.5  15.0   93.8

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     38195.0  0.0   204     0    131072            46.0  14.9   35.8      3.3  14.8   92.7

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     43712.0  0.0   213     0    131072            45.1  15.8   35.3      3.9  14.8   92.3

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     42478.0  0.0   212     0    131072            40.5  18.0   37.2      4.3  14.3   89.2

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     37878.0  0.0   434     0    131072            38.9  17.9   39.1      4.1  14.2   88.8

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     32627.0  0.0   252     0    131072            38.1  15.9   42.6      3.3  13.8   86.0

aio: avgc avfc maxgc maxfc maxreqs avg-cpu: % user % sys % idle % iowait physc % entc
     36750.0  0.0   229     0    131072            41.1  15.5   39.3      4.1  13.9   86.9

====================================================
Code:
Name            Nodename   Mount Pt               VFS   Size    Options    Auto Accounting
/dev/hd4        --         /                      jfs2  6291456 --         yes  no
/dev/hd1        --         /home                  jfs2  8388608 --         yes  no
/dev/hd2        --         /usr                   jfs2  12582912 --         yes  no
/dev/hd9var     --         /var                   jfs2  10485760 --         yes  no
/dev/hd3        --         /tmp                   jfs2  8388608 --         yes  no
/dev/hd11admin  --         /admin                 jfs2  2097152 --         yes  no
/proc           --         /proc                  procfs --      --         yes  no
/dev/hd10opt    --         /opt                   jfs2  4194304 --         yes  no
/dev/livedump   --         /var/adm/ras/livedump  jfs2  2097152 --         yes  no
/dev/roeodbkplv   --     /eodbackup               jfs2  731906048 rbrw,rw    yes  no
/dev/roauditlv    --     /audit                   jfs2  10485760 rw         yes  no
/dev/rodata13lv   --     /abrofindata13             jfs2  624951296 rw         no   no
/dev/rodata11lv   --     /abrofindata11             jfs2  624951296 rw         no   no
/dev/roindex14lv  --     /abrofinindex14            jfs2  415236096 rw         no   no
/dev/rodata17lv   --     /abrofindata17             jfs2  624951296 rw         no   no
/dev/rodata7lv    --     /abrofindata07             jfs2  624951296 rw         no   no
/dev/roindex8lv   --     /abrofinindex08            jfs2  415236096 rw         no   no
/dev/rodata12lv   --     /abrofindata12             jfs2  624951296 rw         no   no
/dev/rodata1lv    --     /abrofindata01             jfs2  1251999744 --         no   no
/dev/rodata5lv    --     /abrofindata05             jfs2  624951296 rw         no   no
/dev/rodata19lv   --     /abrofindata19             jfs2  624951296 rw         no   no
/dev/rodata18lv   --     /abrofindata18             jfs2  624951296 rw         no   no
/dev/rodata15lv   --     /abrofindata15             jfs2  624951296 rw         no   no
/dev/rodata20lv   --     /abrofindata20             jfs2  624951296 rw         no   no
/dev/rodata10lv   --     /abrofindata10             jfs2  624951296 rw         no   no
/dev/rooraclelv   --     /abrodboracle              jfs2  83886080 --         no   no
/dev/rodata6lv    --     /abrofindata06             jfs2  624951296 rw         no   no
/dev/roindex7lv   --     /abrofinindex07            jfs2  415236096 rw         no   no
/dev/roindex3lv   --     /abrofinindex03            jfs2  415236096 --         no   no
/dev/roindex4lv   --     /abrofinindex04            jfs2  415236096 rw         no   no
/dev/roarchlv     --     /abrofindata               jfs2  367001600 --         no   no
/dev/roindex9lv   --     /abrofinindex09            jfs2  415236096 rw         no   no
/dev/rooemdatalv  --     /abrooemdata               jfs2  41943040 rw         no   no
/dev/rodata14lv   --     /abrofindata14             jfs2  628621312 rw         no   no
/dev/roindex11lv  --     /abrofinindex11            jfs2  419168256 rw         no   no
/dev/roindex5lv   --     /abrofinindex05            jfs2  415236096 rw         no   no
/dev/roundolv     --     /abrofinundo               jfs2  230686720 --         no   no
/dev/rosortlv     --     /abrofinsort               jfs2  209715200 --         no   no
/dev/roindex12lv  --     /abrofinindex12            jfs2  419168256 rw         no   no
/dev/rodata9lv    --     /abrofindata09             jfs2  622854144 rw         no   no
/dev/rodata2lv    --     /abrofindata02             jfs2  624951296 --         no   no
/dev/roredo1lv    --     /abrofinredo01             jfs2  39845888 --         no   no
/dev/rointerlv    --     /abrointerfaces            jfs2  102760448 --         no   no
/dev/roindex10lv  --     /abrofinindex10            jfs2  419168256 rw         no   no
/dev/rodata8lv    --     /abrofindata08             jfs2  624951296 rw         no   no
/dev/roredo3lv    --     /abrofinredo03             jfs2  39845888 --         no   no
/dev/rodata3lv    --     /abrofindata03             jfs2  624951296 --         no   no
/dev/roindex1lv   --     /abrofinindex01            jfs2  415236096 --         no   no
/dev/roindex2lv   --     /abrofinindex02            jfs2  415236096 --         no   no
/dev/rodata16lv   --     /abrofindata16             jfs2  624951296 rw         no   no
/dev/roumplv  --         /abrooradump               jfs2  39845888 --         no   no
/dev/roredo2lv    --     /abrofinredo02             jfs2  39845888 --         no   no
/dev/rodata4lv    --     /abrofindata04             jfs2  624951296 rw         no   no
/dev/roindex6lv   --     /abrofinindex06            jfs2  415236096 rw         no   no
/dev/roindex13lv  --     /abrofinindex13            jfs2  415236096 rw         no   no
/dev/roarch1lv    --     /abrofinarch1              jfs2  2147483648 rbrw,rw    no   no

Last edited by Don Cragun; 01-11-2017 at 01:26 AM.. Reason: Change ICODE tags to CODE tags, rearrange tags, and add CODE tags.
# 14  
Old 01-11-2017
By the output of vmstat -v's numclient it seems there would be enough cached files that could be discarded to get free ram.

The AIO requests do not hit the maxreqs so that's good too.

By the mount options it looks you are not using DIO (Direct IO) nor CIO (Concurrent IO) which is often used to get some performance increase.
We implemented CIO once and it was a huge increase on performance for the Ora DB as the filesystem buffers are not used anymore and Oracle handles it itself.

Implementing it I can not say if it changes to the many blocked threads in the RunQueue.
Though if there would be a need for better performance, this should be a way to go.
For implementing it see the appropriate documentations as it may only be used for some types of Oracle files ie. filesystems.

Another much way, which is a lot more work than just adding mount options and the setting agent.kgb mentioned is using the Oracle ASM where you supply raw devices and Oracle will handle them accordingly. Though I have no experience with it and I am not aware what is the current "state-of-the-art".
Here is a document about implementing ASM:
>>> IBM ASM Doc

For the short glimpse and not knowing if there is some workload peaks, the box seems to could have a bit less CPU and RAM.
Last edited by zaxxon; 01-11-2017 at 04:56 AM..
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8. News, Links, Events and Announcements

Announcing collectl - new performance linux performance monitor

About 4 years ago I wrote this tool inspired by Rob Urban's collect tool for DEC's Tru64 Unix. What makes this tool as different as collect was in its day is its ability to run at a low overhead and collect tons of stuff. I've expanded the general concept and even include data not available in... (0 Replies)
Discussion started by: MarkSeger
0 Replies

9. AIX

Performance Problem - High CPU utilization

Hello everybody. I have a problem with my AIX 5.3. Recently my unix shows a high cpu utilization with sar or topas. I need to find what I have to do to solve this problem, in fact, I don't know what is my problem. I had the same problem with another AIX 5.3 running the same... (2 Replies)
Discussion started by: wilder.mellotto
2 Replies
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