Caching is enabled in Jenkins, but it is not used.
The $HUDSON_HOME/hgcache directory is not created.
No errors are logged about something missing or failing in relation to the cache.
Sharing is disabled, but enabling it does not help or show any different in the logs.
I think it worked in the past, but can't find any logs about that anymore.

I searched on the internet and in the Jenkins mailinglists, but found no solution.