EvaluationObject

EvaluationObject[expr,…]

represents an expression submitted for evaluation on any available parallel kernel.

Details

  • Evaluation objects are created with ParallelSubmit.
  • The results of evaluations are collected with WaitAll or WaitNext.
  • All evaluation objects appearing anywhere inside the argument of WaitAll[arg] will be replaced by the respective result of the evaluation.
  • EvaluationObject[…]["prop"] returns the value of "prop" for a given EvaluationObject.
  • EvaluationObject[…]["Properties"] returns a list of all properties available.
  • EvaluationObject[…][All] returns an association with the properties as keys and the value of the respective property.
  • Possible properties for EvaluationObject include:
  • "Process"the expression to be evaluated
    "Result"the result of the evaluation
    "State"the current state of the evaluation object

Examples

open allclose all

Basic Examples  (2)

Submit a single evaluation and wait for it to finish:

Wait for all evaluations contained in a sum:

Scope  (2)

During scheduling, an evaluation goes through these successive states: ready, running, received and finished:

Find the properties of an EvaluationObject:

Only after finishing the evaluation does the result become available:

Information[ev] gives the same information as ev[All]:

Properties & Relations  (2)

Evaluation objects are created with ParallelSubmit:

Their results are collected with WaitAll or WaitNext:

Scheduled evaluations no longer needed can be aborted with AbortKernels:

Possible Issues  (2)

Each evaluation should be waited for exactly once:

The evaluation object has already completed:

Evaluation objects are created by ParallelSubmit; they cannot be input directly:

Wolfram Research (2008), EvaluationObject, Wolfram Language function, https://reference.wolfram.com/language/ref/EvaluationObject.html.

Text

Wolfram Research (2008), EvaluationObject, Wolfram Language function, https://reference.wolfram.com/language/ref/EvaluationObject.html.

CMS

Wolfram Language. 2008. "EvaluationObject." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/EvaluationObject.html.

APA

Wolfram Language. (2008). EvaluationObject. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/EvaluationObject.html

BibTeX

@misc{reference.wolfram_2025_evaluationobject, author="Wolfram Research", title="{EvaluationObject}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/EvaluationObject.html}", note=[Accessed: 05-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_evaluationobject, organization={Wolfram Research}, title={EvaluationObject}, year={2008}, url={https://reference.wolfram.com/language/ref/EvaluationObject.html}, note=[Accessed: 05-May-2025 ]}