Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-13879 ( https://hibernate.atlassian.net/browse/HHH-13879?atlOrigin=eyJpIjoiMDRiNG... ) Re: Slow query log should use System#nanoTime not System#currentTimeMillis ( https://hibernate.atlassian.net/browse/HHH-13879?atlOrigin=eyJpIjoiMDRiNG... ) hi Vlad, careful that’s not a straight forward change. I’m aware that {{ currentTimeMillis }} isn't recommended, but using {{ nanoTime }} might be a worse choice: it is bound to the time of the specific CPU core, so if the context is switched to a different CPU while performing the measured operation, the measured delta could be completely wrong - including possibly negative times as you’re also affected by different speeds of each core and complex power management of modern OSs. The problem is that the task “running a query” is a blocking IO operation by nature, so we’re almost sure that the task will be re-scheduled - we’re just not sure on which physical CPU it will end up with. Using `System#currentTimeMillis` is less precise, but all considered is possibly more suitable in this context. Neither of them has the precision we would need for a “fast operation”, but the specific need of logging *slow queries* the milliseconds should be a good fit. At least while not super precise, it won’t be producing confusing results. ( https://hibernate.atlassian.net/browse/HHH-13879#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-13879#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100121- sha1:a269fed )