DECC$ENABLE_TO_VMS_LOGNAME_CACHE

   Use the DECC$ENABLE_TO_VMS_LOGNAME_CACHE to improve the
   performance of UNIX name translation. The value is the life of
   each cache entry in seconds. The equivalence string ENABLE is
   evaluated as 1 second.

   Define DECC$ENABLE_TO_VMS_LOGNAME_CACHE to 1 to enable the cache
   with a 1-second life for each entry.

   Define DECC$ENABLE_TO_VMS_LOGNAME_CACHE to 2 to enable the cache
   with a 2-second life for each entry.

   Define DECC$ENABLE_TO_VMS_LOGNAME_CACHE to -1 to enable the cache
   without a cache entry expiration.