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Support negative threshold for bigger-is-better in other tools #149

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aherlihy
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Hi, I'd like to request support for using existing tools with a bigger-is-better ratio for alerts. My use case is for JMH which has both a throughput and an execution time mode, I'd like to be able to specify if bigger or smaller is better without dealing with a custom benchmark.

The idea in this PR is that by specifying a negative threshold, you would be indicating that a decrease is something to alert on, but otherwise operates the same. Ideally, we would be able to specify bigger or smaller is better on a per-benchmark case, but that looks like it would require more thought, so in the meantime I thought I'd suggest a quick fix so we can use it asap :)

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@matthargett matthargett left a comment

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Thanks for adding tests!

@@ -210,7 +210,7 @@ function validateAlertThreshold(alertThreshold: number | null, failThreshold: nu
if (alertThreshold === null) {
throw new Error("'alert-threshold' input must not be empty");
}
if (failThreshold && alertThreshold > failThreshold) {
if (failThreshold && Math.abs(alertThreshold) > Math.abs(failThreshold)) {
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@ningziwen ningziwen May 10, 2023

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Is this a breaking change as it adds another scenario that can alert?

The breaking change may be prevented if we add an additional configrable field to toggle this. (as you stated in PR description)

WDYT? How strict are we treating breaking change? @ktrz

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I'm not super fond of the current solution. I would much rather modify the biggerIsBetter function to determine the value based on the units as well.

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4 participants