Use of Work Load Manager.

How to do Performance analysis and Capacity Planning for a shop. We also talk about Software Cost here.

Topic author
Keval Mehta
New Member
Posts: 5
Joined: Fri Jul 18, 2014 4:09 pm

Use of Work Load Manager.

Postby Keval Mehta » Wed May 13, 2015 11:59 am

Hi,

What is work load manager(WLM) in mainframes? Is it something available in mainframes only? How does it help in defining performance of OS390/zOS?
Thnaks in advance



Online
User avatar

Robert Sample
Global Moderator
Global Moderator
Posts: 1275
Joined: Fri Jun 28, 2013 1:22 am
Location: East Dubuque Illinois
Has thanked: 2 times
Been thanked: 90 times

Re: Use of Work Load Manager.

Postby Robert Sample » Wed May 13, 2015 6:02 pm

Workload Manager (WLM) is a z/OS tool to manage the system workload. I don't know if it can be used on any platform other than a z/Architecture machine (z/OS, z/VM, ...) although probably not. WLM is used to define workloads (for example, online, high-importance batch, low-importance batch, TSO, system tasks, high-importance started tasks, low-importance started tasks would be 7 possible workloads -- others could include DB2, MQ series, IMS; I've seen sites with 50 workloads defined). Once the workloads are defined, goals are set (for example, 95% of online transactions should complete in 2 seconds, or 90% of TSO transactions should complete in 5 seconds, or a started task should get 20% of the CPU when it is executing). WLM will monitor the workloads and adjust priorities of executing tasks to respond to the changing system environment. The site can allow WLM to control the initiators, in which case WLM will add or remove initiators (on a JES3 system) to meet the goals.

Broadly speaking, WLM does not define z/OS performance -- the site support group defines a policy which in turn defines the workloads and their relative importance as well as how they want WLM to measure the workload. WLM then implements that policy and manages the system resources to attempt to meet the policy goals. WLM is most useful when the CPU is running at 100% since that is when decisions about relative importance of jobs / tasks / TSO users / online transactions are most important, but WLM will usually improve performance of any z/OS system.




Topic author
Keval Mehta
New Member
Posts: 5
Joined: Fri Jul 18, 2014 4:09 pm

Re: Use of Work Load Manager.

Postby Keval Mehta » Thu Jun 18, 2015 7:29 pm

Thanks Robert.




Return to “Mainframe Performance, Capacity Planning and Software Cost.”

Who is online

Users browsing this forum: CommonCrawl [Bot] and 0 guests