Process Manger

The process manager component manages process groups defined associated with STCI sessions. It is responsible for

  • Creating new process groups, when new sessions are started
  • Expanding existing process groups
  • Shrinking existing process groups

Creating a new process group can have several flavors:

  • Creating a new process group, given a list of process handles
  • Creating a new process group by adding processes to an existing process group

Expanding an existing process group can have several flavors

  • Adding new processes to an existing process group, with out creating a new process group handle
  • Combining two process groups, to form a new process group

Shrinking an existing process group can have several flavors

  • Removing processes from an existing process group, with out creating a new process group handle
  • Removing processes from an existing process group, forming a new process group

Mechanism for creating a new process group:

  • The root for the requests forms a request. This includes a list of processes and a string indentifier.
  • The request is sent to the group-server
  • The group-server checks to see if the request is unique
    • A unique request is assigned a new handle
    • A duplicate request is assigned the previously assigned handle
  • The handle is passed back to the requestor
  • The requesting root broadcasts the handle to all memebers of the group
  • The process creation active message handle is invoked by the Agents at the receiver, after the library sets up its internal data structures for the new group.
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