aix:workloadmanager
Table of Contents
Worload Manager to limit processes
AIX wokload manager can be used to limit processes usage (CPU, IO, and memory)
processes are classified by user, process name, ….
Then rules are applied to each class
Some classes exists by default, but you can create additional, for example for DB2, Oracle….
WLM definitions are stored into /etc/wlm/, you can use smit wlm
Before applying a workload, try it in passive mode, and check the load on each class
root@prod /root> wlmcntrl -p
Watch using wlmstat
root@prod /root> wlmstat CLASS CPU MEM DKIO Unclassified 0.00 0.18 0.00 Unmanaged 0.01 26.58 0.00 Default 1.18 50.09 2.13 Shared 0.00 7.18 0.00 System 0.66 34.50 3.69 TOTAL 1.84 91.95 5.82
root@prod /root> wlmcntrl -q WLM is stopped root@prod /root> wlmcntrl -a root@prod /root> wlmcntrl -q WLM is running root@prod /root> wlmstat CLASS CPU MEM DKIO Unclassified 0.00 20.54 0.00 Unmanaged 0.00 9.04 0.00 Default 2.25 4.38 0.00 Shared 0.00 0.76 0.00 System 1.12 2.41 0.35 TOTAL 3.37 28.09 0.35
root@prod /root> lsclass -f System: memorymin = 1 Default: Shared:
To monitor you can also use:
wlmstat 3 100 nmon (then option W) topas
root@prod /root> topas –W Topas Monitor for host: srv-aix-001nterval: 2 Fri Apr 17 09:08:56 2015 WLM-Class (Passive) CPU% Mem% Blk-I/O% clBP1 24.70 30.67 1.31 System 0.59 34.76 0.00 clPX6 10.12 14.86 0.00 Default 0.03 4.48 0.00 Unmanaged 0.01 26.58 0.00 Shared 0.00 7.18 0.00 Unclassified 0.00 0.18 0.00
Check your process class
root@prod /root> ps -ae -o pid,user,class,args,pcpu,vsz PID USER CLASS COMMAND %CPU VSZ 1 root System /etc/init 0.0 804 590300 root System /usr/sbin/syncd 60 0.0 596 2621880 root System /usr/ccs/bin/shlap64 0.0 392 3867110 root System /usr/lib/errdemon 0.0 928 4325632 root System /usr/sbin/srcmstr 0.0 816 5570884 root Default iostat -Dsal 60 1 0.0 844 5636536 root System /usr/sbin/xntpd 0.0 388 5833142 root System /usr/sbin/syslogd -r -n 0.0 820 5898680 root System /usr/sbin/portmap 2.0 1004 5964220 root System /usr/sbin/aso 0.0 1396 6029626 mqm Default sshd: mqm@pts/1 0.1 1188 6095302 root System /usr/sbin/biod 6 0.0 120 6423002 root System /usr/sbin/pfcdaemon 0.0 1172 6488524 root System /usr/sbin/nfsrgyd 3.0 1352 6816036 root System /opt/rsct/bin/IBM.DRMd 0.0 1696 6881784 root System /usr/sbin/sshd 0.0 1196
Print memory in MB
root@prod /root> ps -ae -o pid,user,class,pcpu,vsz,args | awk '{$5=int(100 * $5/1024)/100"MB";}{ print;}' PID USER CLASS %CPU 0MB COMMAND 1 root System 0.0 0.8MB /etc/init 2884068 root System 0.0 0.58MB /usr/sbin/syncd 60 3342724 root System 0.0 0.38MB /usr/ccs/bin/shlap64 3604962 root System 0.0 0.9MB /usr/lib/errdemon
Switch in WLM in to active mode. Active means monitor and possibly controlling class resource (if you assign shares):
wlmctrl -a
Alternatively, start in passive mode (monitor only and no possibility of changing the behavior):
wlmctrl -p
Create four new classes for RDBMS, Batch, Backup and remote user connection application:
A simple edit to the test file as the root user: /etc/wlm/current/classes
Name the class and specify how AIX can decide which processes are in which class. A simple way is to name the AIX user that starts the workload programs. Alternatives, are using user groups or the directories that contain the binary program files. Once a process is in a class, the default setting is for all processes it creates are in the same class.
Tell AIX WLM to reevaluate ("u" for update) the classes file:
wlmcntrl -u
-a
Starts WLM in active mode or switches from passive to active mode. This is the default when no flag other than -d, -g, or -T is specified.
-c
Starts WLM in processor-only mode or switches from any mode to processor-only mode. In this mode, the WLM accounts for all resources, but only processor resource is regulated.
-d Config_dir
Uses /etc/wlm/Config_dir as an alternate directory for the WLM configuration (containing the classes, limits, shares and rules files) or configuration set (containing the list of configurations
and the time tanges when they apply). This makes /etc/wlm/Config_dir the current configuration. This flag is effective when starting the WLM in active, processor-only or passive mode, or when
updating the WLM. This flag cannot be used in conjunction with the -o and -q flags or when switching from a mode (among active, processor-only and passive) to another.
-g
Instructs WLM to ignore any potential resource set bindings. This means that all classes have access to the whole resource set of the system, regardless of whether or not they use a restricted
resource set.
-o
Stops Workload Manager.
-p
Start WLM in passive mode or switches from any mode to passive mode. In this mode, the WLM accounts for all resources, but no resource is regulated.
-q
List classes and limits class
root@prod /root> lsclass -C #name:description:tier:inheritance:authuser:authgroup:adminuser:admingroup:rset:CPUshares:CPUmin:CPUsoftmax:CPUhardmax:memoryshares:memorymin:memorysoftmax:memoryhardmax:diskIOshares:diskIOmin:diskIOsoftmax:diskIOhardmax:totalCPUhardmax:totalCPUunit:totalDiskIOhardmax:totalDiskIOunit:totalConnecttimehardmax:totalConnecttimeunit:totalProcesseshardmax:totalThreadshardmax:totalLoginshardmax:classRealMem:classRealMemunit:classVirtMem:classVirtMemunit:classLargePages:classLargePagesunit:procVirtMem:procVirtMemunit:localshm:vmenforce:delshm:iopriority System::0:no::::::-:0:100:100:-:1:100:100:-:0:100:100:-:s:-:KB:-:s:-:-:-:-:MB:-:MB:-:MB:-:MB:no:proc:no:0 Default::0:no::::::-:0:100:100:-:0:100:100:-:0:100:100:-:s:-:KB:-:s:-:-:-:-:MB:-:MB:-:MB:-:MB:no:proc:no:0 Shared::0:no::::::-:0:100:100:-:0:100:100:-:0:100:100:-:s:-:KB:-:s:-:-:-:-:MB:-:MB:-:MB:-:MB:no:proc:no:0
Commands to manage classes: mkclass, chclass, rmclass …
| Command | Description | Usage |
|---|---|---|
| mkclass | Creates a WLM class | mkclass <class name> ; mkclass -a inheritance=yes -a localshm =yes <class name> |
| wlmassign | Assigns a process to a WLM class | wlmassign <class name> <process id> |
| lsclass | Returns the list of superclasses | lsclass |
| wlmcheck | Checks WLM settings | wlmcheck |
| rmclass | Removes a WLM class | rmclass <class name> |
| wlmcntrl -p | Starts WLM in passive mode | wlmcntrl -p |
| wlmcntrl -a | Starts WLM in active mode | wlmcntrl -a |
| wlmcntrl -o | Stops WLM | wlmcntr -o |
| wlmcntrl -u | Update WLM (refresh after modifications) | wlmcntr -u |
Monitoring
Multiple tools to monitor WLM
Here example of the class app1
[p630n02][/work]> acctcom -w | grep app1 prog1 user1 app1.Default pts/2 12:02:48 12:05:22 154.12 144.55 10008.00 prog1 user1 app1.Default pts/2 12:05:42 12:07:19 97.16 111.80 7705.00 prog1 user1 app1.Default pts/2 12:09:27 12:10:04 37.20 32.22 4370.00 prog1 user1 app1.Default pts/2 12:10:14 12:14:42 268.50 233.17 10256.00 prog1 user1 app1.Default pts/2 12:17:51 12:20:45 174.62 250.88 13296.00
[p630n02][/work]> acctcom -c app1 COMMAND START END REAL CPU MEAN NAME USER TTYNAME TIME TIME (SECS) (SECS) SIZE(K) prog1 user1 pts/2 12:02:48 12:05:22 154.12 144.55 10008.00 prog1 user1 pts/2 12:05:42 12:07:19 97.16 111.80 7705.00 prog1 user1 pts/2 12:09:27 12:10:04 37.20 32.22 4370.00 prog1 user1 pts/2 12:10:14 12:14:42 268.50 233.17 10256.00
Topas
[p630n02][/work]> topas -W Topas Monitor for host: p630n02 Interval: 2 Mon Oct 25 15:13:04 2004 WLM-Class (Passive) CPU% Mem% Disk-I/O% app1 47 1 0 app2 23 0 0 app3 12 55 0 System 0 7 0 Shared 0 1 0 Default 0 0 0 Unmanaged 0 14 0 Unclassified 0 0 0
wlmstat
p630n02][/etc/wlm/current]> wlmstat CLASS CPU MEM DKIO Unmanaged 0 14 0 Default 0 0 0 Shared 0 1 0 System 0 7 0 app1 44 1 0 app2 22 0 0 app3 8 55 0 TOTAL 74 64 0
[p630n02][/etc/wlm/current]> wlmstat -Svc CLASS tr i #pr CPU sha min smx hmx des rap urap pri Unmanaged 0 0 0 0 -1 0 100 100 100 100 0 10 Default 0 0 0 0 -1 0 100 100 100 100 0 0 Shared 0 0 0 0 -1 0 100 100 100 100 0 0 System 0 0 80 0 -1 0 100 100 100 100 0 0 app1 0 1 2 43 -1 0 100 100 100 100 0 0 app2 0 1 2 19 -1 0 100 100 100 100 0 0 app3 0 1 1 06 -1 0 100 100 100 100 0 0
Example of config
root@aixtest /etc/wlm/current> cat /etc/wlm/current/classes System: Default: splunk: inheritance = "yes" authuser = "splunk" root@aixtest /etc/wlm/current> cat /etc/wlm/current/limits System: memory = 1%-100%;100% splunk: CPU = 0%-10%;10% root@aixtest /etc/wlm/current> cat /etc/wlm/current/rules * class resvd user group application type tag splunk - splunk - - - - System - root - - - - Default - - - - - - root@aixtest /etc/wlm/current> cat /etc/wlm/current/shares * IBM_PROLOG_BEGIN_TAG
aix/workloadmanager.txt · Last modified: 2024/04/08 18:01 by manu
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