Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiOGNhNjVjNmFm... ) / Improvement ( https://hibernate.atlassian.net/browse/HHH-16214?atlOrigin=eyJpIjoiOGNhNj... ) HHH-16214 ( https://hibernate.atlassian.net/browse/HHH-16214?atlOrigin=eyJpIjoiOGNhNj... ) Improve memory and access efficiency in SqmFunctionRegistry ( https://hibernate.atlassian.net/browse/HHH-16214?atlOrigin=eyJpIjoiOGNhNj... ) Issue Type: Improvement Assignee: Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Components: hibernate-core Created: 21/Feb/2023 07:17 AM Fix Versions: 6.2.0, 6.3.0 Labels: performance Priority: Minor Reporter: Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Checking retained memory dumps via Eclipse MAT, I’ve spotted that SqmFunctionRegistry has an unusually high memory footprint; this seems due to its use of TreeMap instances internally, which are also known to not perform very well on lookups. I’m proposing to replace these maps with a ConcurrentHashMap wrapper which retains the same semantics as the current TreeMap: case-insensitive access, and a logging capability which logs all registered functions in stable order. ( https://hibernate.atlassian.net/browse/HHH-16214#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16214#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#100216- sha1:3fa9804 )