in case you are running SP 6 (revision 60 or higher), you might have wondered what the new “compileserver” process is for (one per HANA instance).
The compileserver is needed with SAP HANA SP6 as compiling of L-Procedures has been thrown out of Indexserver.
Without compile server, HANA will not start any more. This is a feature. For customers this is irrelevant, as HANAs default parameters will make sure that it is started. If customers change these defaults, the system is no longer supported.
SAP Customer Solution Adoption (CSA)