Configuration setup for Phy CPU

175 pts.
Tags:
CPU
RPG
WRKACTJOB
Hi, We have 2 different systems and configuration for cpu is done as below:
System 1 with single threaded movex rpg
Assigned Physical Cpu -2
VCpu -2
Uncapped
System 2 with multi threaded Movex java:
Assigned physical Cpu -1
VCpu -1
Uncapped
Looking at above figures system should run with 100% utilization however I also see in wrkactjob total CPU does not go beyond 100%. We have a problem here when there are N number of jobs running in the system and due to few looping jobs system went on halt state. All jobs processing is stopped since they are not getting complete CPU for processing. Eventually, we ended high CPU jobs and to clear the traffic however total CPU is not shared beyond 100% or system does not borrow CPU from other resources like VIOS. The question is that do we have a right configuration set up for Phy CPU and virtual CPU? shouldn't Vcpu higher than Phy CPU? The reason because when we changed the vCPU as below System started borrowing CPU and all jobs running fine.
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  • TheRealRaven
    What is the model and processor options? What are the OS (and LIC) versions? What are the cume PTF levels? Knowing those might allow looking for possible limits on reported values.
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  • deepakt1
    Hi,

    Type-model . . . . . . . . . :   8205-E6C  
    Serial number  . . . . . . . :   06-B59BR  
    OS...........................V7R1
    SF99710               13298  Installed (planning is to upgrade to latest level asap)

    Processer is uncapped as sharing, 
     IBM I assigned pCpu, Vcpu 1:1, uncapped, weight 128
    Vios assigned; pCpu, Vcpu 1:1, uncapped, weight 250


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  • TheRealRaven
    Looking at above figures system should run with 100% utilization however I also see in wrkactjob total CPU does not go beyond 100%.

    Why do you think it should ever be more than 100%? It should be rare to see percentage go as high as 100%.

    We have a problem here when there are N number of jobs running in the system and due to few looping jobs system went on halt state. All jobs processing is stopped since they are not getting complete CPU for processing. Eventually, we ended high CPU jobs and to clear the traffic however total CPU is not shared beyond 100% or system does not borrow CPU from other resources like VIOS.

    There's not enough shown of the configuration to be sure of anything. It looks like you have dedicated processors assigned. If that's what you have configured, that's what you'll get. There won't be any "borrowing" from anywhere.

    See page 117 of IBM PowerVM Virtualization Introduction and Configuration under 'Dedicated processors':
    • Each processor is wholly dedicated to the LPAR. It is not possible to mix shared processors and dedicated processors in the same partition.

    AFAIK, that gets to the question of "more than 100%".

    The question is that do we have a right configuration set up for Phy CPU and virtual CPU? shouldn't Vcpu higher than Phy CPU? The reason because when we changed the vCPU as below System started borrowing CPU and all jobs running fine.

    "Below"? Below where?

    Anyway, without seeing much more of the configuration there's not much to add.

    How many pbysical CPUs are in your system? A POWER7 740 can have 4-core, 6-core, and 8-core POWER7 processor modules. What is the complete actual configuration for what you have?
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