Selecting an operator graph configuration for a stream-based computing application

A computer program product for selecting an operator graph configuration for a stream-based computing application, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code comprising computer readable program code configured to:

• perform a first simulated processing of the stream-based computing application using a first simulation condition, the first simulation condition specifying a first operator graph configuration;
• perform a second simulated processing of the stream-based computing application using a second simulation condition, the second simulation condition specifying a second operator graph configuration, the second simulation condition being distinct from the first simulation condition;
• each simulated processing including inputting a stream of test tuples to the stream-based computing application, the stream-based computing application operating on one or more compute nodes, each compute node having one or more computer processors and a memory to store one or more processing elements, each processing element having one or more stream operators;
• monitor each simulated processing to determine one or more performance metrics;
• sort the first and second simulated proces sings based on a first performance metric to identify a simulated processing having a first rank;
• and
• select an operator graph configuration associated with the simulated processing having the first rank if the first performance metric for the simulated processing having the first rank is within a processing constraint.

A stream-based computing system, comprising:

• one or more compute nodes, each compute node having one or more computer processors and a memory to store one or more processing elements, each processing element having one or more stream operators, the compute nodes being configured to:
• perform a first simulated processing of the stream-based computing application using a first simulation condition, the first simulation condition specifying a first operator graph configuration;
• perform a second simulated processing of the stream-based computing application using a second simulation condition, the second simulation condition specifying a second operator graph configuration, the second simulation condition being distinct from the first simulation condition;
• and
• a management system operating on a compute node, the compute node having one or more computer processors and a memory to store an application verifier, the application verifier being configured to:
• monitor each simulated processing to determine one or more performance metrics;
• sort the first and second simulated processings based on a first performance metric to identify a simulated processing having a first rank;
• and
• select an operator graph configuration associated with the simulated processing having the first rank if the first performance metric for the simulated processing having the first rank is within a processing constraint.