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  man pages->Tru64 Unix man pages -> xmesh (1)              



NAME    [Toc]    [Back]

       xmesh  -  Reports  utilization  percentages  of  EV7 based
       AlphaServer systems mesh components.

SYNOPSIS    [Toc]    [Back]


OPTIONS    [Toc]    [Back]

       The xmesh  application  accepts  all  of  the  standard  X
       Toolkit command line options,  which are documented in the
       OPTIONS section in the X(1X) reference page.

DESCRIPTION    [Toc]    [Back]

       You use the xmesh application to view a mesh, which is the
       interconnection  of CPUs on EV7 based AlphaServer systems.
       The xmesh application reports the percent  of  utilization
       for  the  hardware  components associated with each CPU. A
       color spectrum indicates levels of  utilization  for  each
       hardware  component.  There are 10 colors in the spectrum,
       ranging from purple, which indicates low  utilization,  to
       red, which indicates high utilization.

       The  xmesh application reports utilization for the following
 EV7 based AlphaServer  systems  mesh  components:  the
       CPU,  the Zbox (the memory controller), the RBox I/O (Rbox
       I/O port utilization), IO7 (ports 0, 1, 2, and 3), the  Up
       and Down Hoses, and the North, South, East and West interprocessor
 ports on the EV7 chip.

       You can use  the  information  obtained  from   the  xmesh
       application  to  monitor data flow between CPUs, determine
       resource bottlenecks and  watch  for  non-optimal  performance,
  and  identify  applications that are memory or CPU

       Although software can treat a CC-NUMA (Cache Coherent NonUniform
  Memory  Access)  system  (such  as  an  EV7 based
       AlphaServer system) as a traditional SMP system and  still
       be programmatically correct, obtaining optimal performance
       from a CC-NUMA system depends on appropriate  use  of  its
       capabilities.  Starting  with  Tru64 UNIX Version 5.1, the
       operating system includes  kernel  algorithms,  utilities,
       and programming APIs that are NUMA aware. These algorithms
       and user interfaces are used  to  maximize  the  ratio  of
       local  to  remote  memory accesses and thereby help ensure
       optimal performance on CC-NUMA hardware.

       If the xmesh application reveals that utilization  factors
       are  reaching  maximum  capacity and there are performance
       bottlenecks, you have several alternatives. For  instance,
       if  there  is  too  much I/O targetted to one CPU's disks,
       there is contention for access to memory on  a  particular
       CPU,  or  perhaps  a CPU is reaching its maximum of memory
       utilization, consider modifying your applications  to  run
       on  a particular CPU, allocate memory to a particular CPU,
       or bind processes to a particular RAD  (Resource  Affinity

RESTRICTIONS    [Toc]    [Back]

       Users  do  not require special privileges to run the xmesh
       application, however, only one instance of xmesh  can  run
       at a time.

ERRORS    [Toc]    [Back]

       Another  xmesh  is  running on this system. Only one xmesh
       can be run against a system.

              The owner of that process is: <username>

              The process id is: <pid>


              Only one process can open the /dev/marvel_pfm file,
              therefore only one user can run xmesh at a time.

              User Action:

              Determine who is running xmesh and ask them to exit
              the application.  Xmesh is not  supported  on  this
              platform.  Please refer to the "xmesh" man page for
              additional information.


              The xmesh application  is  supported  only  on  EV7
              based  AlphaServer platforms  because it is of little
 benefit on any other platform.

FILES    [Toc]    [Back]

       The driver that collects low-level statistics  for  xmesh.
       Contains  the  xmesh  help  volume.   Contains the default
       application's X resources

SEE ALSO    [Toc]    [Back]

       Commands: runon(1)

       Functions: numa_intro(3)

       Files: numa_scheduling_groups(4), numa_types(4)

       NUMA Overview

       The NUMA Overview is a web-only document that  includes  a
       complete  NUMA  programming  example.  Starting with Tru64
       UNIX Version 5.1, this web-only document can  be  accessed
       through the version-specific web pages for Tru64 UNIX documentation.
 Links  to  documentation  sets  for  different
       product  versions  are  available  at the following URL: '

[ Back ]
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