Reducing_LOAD_Time

   There are different means you can use to try to decrease LOAD
   time. Listed below are a few guidelines that may help you reduce
   LOAD time:

   o  Loading an SCA library for a software system is a time
      consuming operation and should be done in batch. Loading
      more than one module at a time is more efficient than loading
      modules separately. Using LOAD *.ANA is a common method for
      loading multiple modules. You use LOAD/DELETE to clean up .ANA
      files after they are loaded successfully and to use a little
      less disk space during the load.

   o  With large software systems, it is a good idea to use more
      than one SCA library and load them all simultaneously. This
      can lessen the elapsed LOAD time considerably. You should be
      able to load several libraries simultaneously on a single
      disk. Additionally, using more than one CPU to do your loads
      also helps, but SCA loading is mainly I/O intensive. For more
      information about how to use multiple libraries, see the help
      subtopics under Libraries.

   o  Once your SCA library starts getting above 20K blocks, you
      should consider preallocating the library when you create it.
      SCA currently extends the library file by 1000 blocks at a
      time, so for large libraries it frequently extends the library.

      You can preallocate an SCA library by specifying CREATE LIBRARY
      /SIZE=xxx, where xxx is the size of the library in disk blocks.

      Use the size of the SCA$EVENT.DAT file in your current SCA
      library directory as the value to the /SIZE qualifier.

   o  SCA uses a large number of I/Os during LOAD. Loading an SCA
      library on a heavily used or badly fragmented disk causes the
      load to be less efficient.

      You can tell how badly your SCA libraries are fragmented by
      using the following command:

        $ DUMP/HEADER/BLOCK=COUNT=0 -
        _$ DISK:[sca_library_directory]SCA$EVENT.DAT

      The interesting portion of the output is the Map area. Each
      retrieval pointer represents a contiguous section on the disk.
      Because SCA extends SCA libraries 1000 blocks at a time, having
      a lot of retrieval pointers smaller than this is a strong
      indication that some defragmentation is needed.