Re: Tomcat config with virtual threads

On 02/02/2026 10:16, [email protected] wrote:
> Hello,
> 
>   
> 
> I'm working with Tomcat 10.1.4x and java25, our application is extensively
> using virtual threads. I enable them in tomcat by simply using
> 'useVirtualThreds: true'.
> 
>   
> 
> It's working perfectly, by I was wondering if parameters like maxThreads,
> minSpareThreads, acceptCount, etc has any effect when working with virtual
> threads.
> 
>   
> 
> For instance, I set maxThreads = minSpareThreads = acceptCount = 1, and
> nothing seems to change (for worse).

maxThreads - no effect

minSpareThreads - no effect

In short, anything that you can set on an Executor will have no effect.

acceptCount will have an effect (if your OS pays any attention to the 
setting - not all do).

The setting likely to have the most impact in this area will be 
maxConnections. If set, once you hit maxConnections then acceptCount 
comes into play.

HTH,

Mark