| HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English 160930 | CD Disk Download | User Guides |
| HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English 160930 | CD Disk Download | User Guides |

 
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HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English

HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English 160930
Download And CD Available
HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English

HP Compaq Designjet 220 Mixed Workload Design Priority Guidelines English


Additional information on your HP Compaq Printers And Fax Machines. This manual has not been listed as either a service or user manual for your Designjet 220 but may be of interest.
    Mixed Workload Design
    Priority Guidelines




    Summary
    This white paper briefly describes the high level design for the Mixed Workload Design and presents some
    general guidelines to control mixed workload applications using priority settings


    MWE Basic Design
    The HP NonStop Kernel operating system uses a priority based design to control process dispatch The
    highest priority executable process on the ready list is dispatched

    Applications rely on a variety of system services including communication security transaction and data
    services These services are typically provided using a client server model using non stop process pairs
    The heart of the database engine is the data access manager more commonly referred to as DP2

    By definition DP2 runs at system priority 220 which ensures that the operating system and transaction
    services function properly

    Definition Priority Inversion

    When a service process executes at system priority a low priority transaction can utilize high
    priority services

    Low priority workload requests for services can delay service for higher priority workloads This
    behavior is termed priority inversion

    To prevent priority inversion the service process must not service lower priority requests while
    higher priority workloads are waiting for any resources AND must preempt active service when
    higher priority workloads require new resources


    The use of message priority by the high priority system service DP2 to prevent priority inversion includes
    both CPU and I O resource contention The methods used to resolve this contention include the following

    1 CPU context switch which compares the priority of the currently active request with the priority
    of processes on the ready list This is used to resolve conflicts for the CPU resource
    2 Request context switch which compares the priority of the currently active request with the
    priority of the message queue This is used to resolve conflicts for the data services
    3 Reduction in query read ahead which compares the priority of the currently active request with
    the priority of any active disk I O This is used to resolve conflicts for I O services
    4 Query deferral which compares the priority of the current active request with the priority of any
    active disk I O This is used to resolve conflicts for I O services when parallel query workloads
    are active




    Hewlett Packard Company 528875 001
    Contention for CPU Resources
    Various techniques are used to ensure high priority workloads are not impacted by CPU intensive low
    priority workloads such as SQL query activity The message queue for DP2 services is priority ordered
    and the DP2 process will wait on the ready list at the request priority until it reaches the head of the
    ready list Once DP2 is dispatched it will process the request at the normal DP2 priority 220

    If the current request is a lower priority SQL query DP2 will periodically yield the CPU to processes with
    a priority higher than the currently active request The frequency is limited to avoid the extra overhead of
    context switching

    Contention for DP2 Resources
    In addition to the check for CPU contention DP2 will also check the message queue to determine if there is
    contention for data access services If there is a new request for service with a higher priority than the
    currently active request and it is not handled by another process in the group then the current request will
    be preempted


    Contention for I O Resources
    SQL query workloads can be highly optimized with predicate evaluation performed directly by the data
    access manager This is most notable with a query that consumes all data in the table Such a query can be
    throttled in the face of higher priority work by reducing the rate of read ahead

    The amount of reduction in read ahead is limited If the read ahead is reduced to zero single block I O
    the impact to the I O system can be as bad as too much read ahead in most cases

    Query Deferral
    Simple contention checks are not sufficient to prevent impact to high priority transaction response time if
    the amount of resources typically consumed by high priority workloads is below capacity Any available
    resources that allow some service to lower priority workloads can result in some transaction response time
    delays due to the CPU and I O context switching

    To overcome this problem lower priority SQL query workloads may be periodically deferred by DP2 The
    duration of deferral is directly related to the priority of the query The lower the priority the longer the
    deferral period and the higher the priority the shorter the deferral period

    The deferral can be viewed as a time slice SQL query workloads are typically processed by the data
    access manager at one second intervals where DP2 processes work during that period with a re drive
    mechanism between the SQL file system and DP2 every second The interval may be smaller for
    contention buffer overruns and other conditions such as lock conflicts

    If the priority of the query is above 150 a DP2 process will spend the entire 1 second interval working on
    the query before invoking the re drive If the priority is 150 or less DP2 will delay work on the query for
    some fraction of the 1 second interval The delay period is inversely proportional to the request priority

    This means that the relative priority of the SQL query acts as a throttle in the face of higher priority
    transaction workloads The lower the priority of the SQL query the less impact to transaction response
    time and the higher the priority of the SQL query the more impact to transaction response time

    At the same time the SQL query run in the face of higher priority transaction workloads will run faster and
    consume more resources when run at higher priority and will run slower and consume less resources when
    run at lower priority



    Hewlett Packard Company 528875 001



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Device Manager Codes: Information on how to repair the faults below is listed in our forums
Error Code 1 This device is not configured correctly (Code 1)
Error Code 2 Windows could not load the driver for this device because the computer is reporting two <type> bus types (Code 2)
Error Code 3 The driver for this device may be bad, or your system may be running low on memory or other resources (Code 3)
Error Code 4 This device is not working properly because one of its drivers may be bad, or your registry may be bad (Code 4)
Error Code 5 The driver for this device requested a resource that Windows does not know how to handle (Code 5)
Error Code 6 Another device is using the resources this device needs (Code 6)
Error Code 7 The drivers for this device need to be reinstalled (Code 7)
Error Code 8 This device is not working properly because Windows cannot load the file <name> that loads the drivers for the device (Code 8)
Error Code 9 This device is not working properly because the BIOS in your computer is reporting the resources for the device incorrectly (Code 9)
Error Code 10 This device is either not present, not working properly, or does not have all the drivers installed (Code 10)
Error Code 11 Windows stopped responding while attempting to start this device, and therefore will never attempt to start this device again (Code 11)
Error Code 12 This device cannot find any free resources to use (Code 12)
Error Code 13 This device is either not present, not working properly, or does not have all the drivers installed (Code 13)
Error Code 14 This device cannot work properly until you restart your computer (Code 14)
Error Code 15 This device is causing a resource conflict (Code 15)
Error Code 16 Windows could not identify all the resources this device uses (Code 16)
Error Code 17 The driver information file <name> is telling this child device to use a resource that the parent device does not have or recognize (Code 17)
Error Code 18 The drivers for this device need to be reinstalled (Code 18)
Error Code 19 Your registry may be bad (Code 19)
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Error Code 22 This device is disabled This device is not started. (Code 22)
Error Code 23 This display adapter is functioning correctly This device is not started. (Code 23)
Error Code 24 This device is either not present, not working properly, or does not have all the drivers installed (Code 24)
Error Code 25 Windows is in the process of setting up this device (Code 25)
Error Code 26 Windows is in the process of setting up this device (Code 26)
Error Code 27 Windows cant specify the resources for this device (Code 27)
Error Code 28 The drivers for this device are not installed (Code 28)
Error Code 29 This device is disabled because the BIOS for the device did not give it any resources (Code 29)
Error Code 30 This device is using an Interrupt Request IRQ resource that is in use by another device and cannot be shared (Code 30)
Error Code 31 This device is not working properly because <device> is not working properly (Code 31)
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Error Code 35 Your computer's system firmware does not include enough information to properly configure and use this device (Code 35)
Error Code 36 This device is requesting a PCI interrupt but is configured for an ISA interrupt (Code 36)
Error Code 37 Windows cannot initialize the device driver for this hardware (Code 37)
Error Code 38 Windows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory (Code 38)
Error Code 39 Windows cannot load the device driver for this hardware The driver may be corrupted or missing (Code 39)
Error Code 40 Windows cannot access this hardware because its service key information in the registry is missing or recorded incorrectly (Code 40)
Error Code 41 Windows successfully loaded the device driver for this hardware but cannot find the hardware device (Code 41)
Error Code 42 Windows cannot load the device driver for this hardware because there is a duplicate device already running in the system (Code 42)
Error Code 43 Windows has stopped this device because it has reported problems (Code 43)
Error Code 44 An application or service has shut down this hardware device (Code 44)
Error Code 45 Currently, this hardware device is not connected to the computer (Code 45)
Error Code 46 Windows cannot gain access to this hardware device because the operating system is in the process of shutting down (Code 46)
Error Code 47 Windows cannot use this hardware device because it has been prepared for "safe removal", but it has not been removed from the computer (Code 47)
Error Code 48 The software for this device has been blocked from starting because it is known to have problems with Windows (Code 48)
Error Code 49 Windows cannot start new hardware devices because the system hive is too large exceeds the Registry Size Limit) (Code 49)

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