Re: Groovy 5 - Performance / @CompileStatic

On 07.08.25 21:24, MG wrote:
> Hi .+,
> 
> since Groovy 5 to my knowledge is the first Groovy which does away with 
> the old, faster, non-invoke-dynamic call site resolution support, I 
> wanted to do a quick post on that topic that might be of interest to 
> larger Groovy projects like ours:
> 
>  1. After the initial performance problems in Groovy 3/4 caused
>     by invoke-dynamic, for which we were, with some effort, in the end
>     able to pinpoint the culprit in our code and implement a workaround,
>     we unfortunately discovered another performance drop in a later
>     Groovy version.
>      1. The drop was less severe than in the previous case, but was
>         around a factor of 2 when it appeared.
>  2. In this case we were alas not able to find a specific code part that
>     caused the drop in performance, but it seemed like Groovy was
>     leaking a bit of performance on every level, which in the end added
>     up to our main web application running with half speed in certain
>     crucial parts, as well as our test suite taking far longer to
>     execute fully.
[...]
I have a long list of changes to be done to the invokedynamic code. The 
simple problem is that invokedynamic is complex and difficult to handle. 
And because of context switching I never found a window big enough to 
actually do the changes I have in mind. Then I wanted to write a 
document explaining all the problems so that maybe others can do it... 
but that turned out to be still too much so far.

bye Jochen