My colleague was recently configuring MMS on our SP2013 website farm and got some errors that indicated that memory was too low on the SharePoint server. If you look at the server into the Task Manager you will see that the noderunner.exe processes will consume a lot of memory. These processes run for the continues crawl.
To free some memory you can restart the process “SharePoint Search Host Controller”. Don’t be afraid when restarting take some time, couple of minutes. A lot of memory must be freed.
On our server we saw a 70% drop in memory usage. Configuring MMS was possible now.
Read more at: http://www.information-worker.nl