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https://issues.apache.org/jira/browse/MESOS-8989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16511798#comment-16511798
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Meng Zhu commented on MESOS-8989:
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So currently, range subtraction is about 2-3 times more expensive than addition.
> Add a better benchmark for range type resources.
> ------------------------------------------------
>
> Key: MESOS-8989
> URL: https://issues.apache.org/jira/browse/MESOS-8989
> Project: Mesos
> Issue Type: Improvement
> Reporter: Meng Zhu
> Assignee: Meng Zhu
> Priority: Minor
> Labels: benchmark
>
> While investigating the performance issue with the `available()` function in
> the allocator, the arithmetic of range type resources, namely ports, appear
> to be most expensive. And the subtraction proves to be significantly more
> expensive than the addition whose cause is not immediately clear to me.
> While we do have a benchmark
> `[Resources_Scalar_Arithmetic_BENCHMARK_Test|https://github.com/apache/mesos/blob/1b851877ff22cf2da193bb649dc838bb50c26b34/src/tests/resources_tests.cpp#L3610-L3626]`
> that contains a range parametrized test, its result is somewhat misleading.
> It evaluates the addition performance by repeatedly summing up the same port
> resources which is fine. However, when evaluating the subtraction, it took
> the result from the addition and repeatedly subtracting the same port
> resources. The result is that after the first subtraction, the subtrahend
> becomes empty and all the subsequent subtractions are shorthanded, producing
> uninstructive result.
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