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Network Working Group                                        25 January 1971Request for Comments: 90                                     R. T. BradenNIC 5707                    CCN AS A NETWORK SERVICE CENTERA. INTRODUCTION   CCN, the Campus Computing network of UCLA, will shortly be connected   to the ARPA Network as a host of the "Service Center" type. The   purpose of this RFC is to describe the hardware and software available   at CCN and the services we are now planning to provide to other   Network Hosts.   These services and their implementation priority were chosen in   consultation with a particular site (RAND) which plans to use CCN via   the Network. We would welcome requests and comments from other sites.B. CCN HARDWARE   CCN operates an IBM 360/91KK, i.e., a Model 91 CPU with a 4 million   byte fast memory.      CPU Speed:      Highly program-dependent; 2-6 Mips, with 3 Mips as a                      useful average.  The upper end of this range occurs                      heavy floating point in the inner loops.  The decimal                      arithmetic operation of a 360 should be avoided as                      they are executed interpretively by the 91.      Memory Speed:   Memory is interleaved 16 ways and extensively                      buffered. Effective memory fetch time is 600 ns in                      lower 2 million bytes, 900 ns in upper 2 million                      bytes.      I/O Con-      figuration      a) 6 2860       Selector Channels                      b) 1 2870       Multiplexor Channcl (with 16 control                                      unit RPQ)                      c) 5 2314       Disk Storage Units (i.e., 40 disk                                      drives).                      d) 1 2301       Drum (Systems residence and catalog                                      only.)                      e) 5 (245x)     9 track tape drives (80O bpi)                      f) 3 (240x)     7 tracts tape drives (200/556/800 bpi)                      g) 1  2291      (Modified 2250 CRT) Operator/                                      Maintenance Console.Braden                                                          [Page 1]

RFC 90              CCN As a Network Service Center         January 1971                      Also on the Multiplexor Channel are:                      h) 2 card readers and 4 high speed printers at CCN;                      i) Four 40,000 baud interfaces for CCI alphanumeric                         TV display consoles (currently supporting 40                         consoles);                      j) Six data communication ports (3 dial @ 2000 baud,                         1 dedicated @ 4800 baud, and 2 dedicated @ 50,000                         baud) for remote batch entry terminals;                      k) a Calcomp plotter;                      l) an interface for BBS Teleputers (the Culler-Fried                         system);                      m) Ten dial ports for 2741 typewriter terminals;                         and finally:                      n) the IMP InterfaceC. OPERATING SYSTEM   The Model 91 operates under the IBM-supplied MVT version of OS/360,   currently Release 18.6. This system contains a set of modifications   developed at CCN for control of batch job flow. MVT is a realization   of the general process model of multiprogramming, although this fact   is obscured by IBM's terminology. For example, a process is called a   task in MVT, while the fork primitive is called "ATTACH".D. USER SOFTWARE   1. Processors:       CCN provides the following user software:       a) The usual FORTRAN compilers (FORT G. FORT H. WATFOR);       b) PL/1 (version 5) and PL/C (Cornell's student PL/1);       c) Assembler G;       d) IBM Algol F;       e) IBM Linkage Editor F, and a fast in-core linkage editor written          at CCN;Braden                                                          [Page 2]

RFC 90              CCN As a Network Service Center         January 1971       f) Miscellaneous processors, including:          COBOL, SPI, XP7, META-5, SNOBOL, LISP 1.5, AUTOFLOW  SIMSCRIPT          1.5, MIX (Knuth's student machine), CSMP, GPSS, ECAP, APT, PMS,          MATLAN, SYMAP, SPSS, and the BMD series}       g) the IBM file utilities, SORT, and RPG.   2. Interactive Systems       a) URSA        Conversational remote job entry system based                      on alphanumeric display consoles (IBM 2260                      and CCI CC301 consoles). URSA provides a                      number of other services, including a "desk                      calculator", an interactive/interpretive                      assembler, and on-line utilities for manipu-                      lation of the OS file system. It also con                      tains the CCN operator interface to MVT.                      URSA is not suitable for typewriter interaction                      because it is designed for "instantaneous" dis                      play of at least 480 characters at a time.       b) APL         IBM Program Product version of this well-known                      interactive system. Currently supports IBM 2741's                      (Selectric typewriter terminals) only.       c) OLMS        UCLA implementation of the Culler-Fried system;                      nearly identical in language to the UCSX On-line                      System.      d) TSO          IBM's new general purpose time-sharing subsystem                      under MVT, to be available at CCS sometime during                      1971. TSO supports 2741's and Teletypes (and at                      CCN it will support CCI consoles). TSO is                      reminiscent of CTSS in its capabilities and                      command language.E. REMOTE JOB SERVICE       The RJS ("remote Job service") subsystem, was written by CCN to   support remote batch terminals communicating over dial and leased   lines. A remote batch terminal consists of a set of unit record   devices (one or more card readers, printers, and punches) driven   either by a hardwired controller or by a small CPU (e.g., IBM Model 20   or 1130). A remote RJS user enters OS/360 jobs, complete with JCL,   into the remote reader; the jobs are spooled into the operating system   and run in their turn, and the printed and/or punched output isBraden                                                          [Page 3]

RFC 90              CCN As a Network Service Center         January 1971   returned to the remote terminal from which the jobs originated (unless   the user or operator re-routes the output). The remote terminal may   also include a console typewriter to be used by the remote operator to   receive and send messages and to exert control over his terminal.F. FAST BATCH SUBSYSTEM       CCN has written a fast batch subsystem called QUICKRUN to provide   "instant" turnaround for small, simple batch jobs which are common in   a university computing center. QUICKRUN accepts a very simple job   control language ("QCL") without much of the generality of OS/360 JCL.       QUICKRUN is really a batch job control subsystem which itself runs   essentially as a job within MVT. Because of its lack of generality,   the QUICKRUN subsystem creates much less system overhead than normal   OS batch; this is reflected in lower cost per job in QUICKRUN.       QUICKRUN is available at remote batch terminals through RJS as   well as through a self-service card reader at CCN.G. SPECIAL CONSIDERATIONS   1. Core Memory for Batch Jobs      CCN can easily run batch jobs requiring up to 3 million bytes,      although jobs over 600K bytes will normally not run during prime      time.   2. Disk Space      CCN provides extensive on-line disk space for permanent files. The      resident disk pack configuration includes:      220 M bytes (8 packs) of user source programs, for use through      URSA.      170 M bytes (6 packs) of user object and load modules ("binary      decks") and other files.      100 M bytes of limited-time storage (n days, where n is published      number satisfying 7<= n < 0)      This space is charged for, at about 5s per kilobyte per month.      In the future, we plan to significantly extend this on-line space      by implementing a tertiary storage system using magnetic tapes.      In addition, a batch job may always request that the user's own      disk pack be mounted, thus allowing very large private collectionsBraden                                                          [Page 4]

RFC 90              CCN As a Network Service Center         January 1971      of files.   3. Rates      Batch charges are based upon t(CPU time), I(number of I/O requests      ), and R(core memory region size). The current rate schedule may be      obtained from:           Mr. Kenneth Tom           User Relations Supervisor           UCLA           Campus Computing Network           Math Sciences Addition           Los Angeles, California 90024      Generally speaking, the CCN Model 91 cost is very attractive for      compute-bound, heavy floating-point calculations, particularly      where large regions are required. For most other jobs, the CCN      machine is competitive with other cost-recovery computing centers      which operate without special subsidy.G. SERVICE TO NETWORK           CCN currently plans to provide RJS, URSA, and (eventually)      TSO service to the Network. Each of these will have its own third-      level protocol. In addition, there will be a "transparent" third      level protocol to allow a user-written program running in batch or      TSO at CCN to converse directly with the Network.           The third-level protocols, in the order in which we plan to      implement them, are as follows:           1. NETRJS              NETRJS is the name of the third level protocol by which a              user process in a remote host will simulate a remote batch              terminal connected to CCN's RJS system. Thus, NETRJS will              allow a user to submit complete batch jobs to the 360/91              and receive their print and punch output streams back over              the Network. NETRJS has been specified in RFC #88 and              implementation is targeted for March, 1971.           2. NETCRT              This protocol will allow a Network user to simulate an              (idealized) CCI alphanumeric display console and use CCN's              URSA system (and eventually TS0). An initial version of              NETCRT will be circulated shortly as an RFC.Braden                                                          [Page 5]

RFC 90              CCN As a Network Service Center         January 1971           3. NETTRANS              This is the "transparent" protocol allowing a user process              at CCN to talk over the Network. It has not yet been              specified.           4. NETTYPE              This protocol will allow a real or simulated 2741 to use              TS0 (and perhaps APL) via the Network.H. REFERENCES   1. "IBM System/360 Model 91 Functional Characteristics". IBM Form A22-6907.   2. "An Implementation of MVT". CCN Technical Report TR-1 (August, 169).   3. For more information, see CCN Users' Manual.   4. "APL/360 Primer". IBM Form GH20-0689.   5. "Planning for TS0". IBM Form GC28-6698.   6. "Remote Job Service". CCN Technical Report TR-2 (undated).         [ This RFC was put into machine readable form for entry ]          [ into the online RFC archives by Robert Lamothe 3/97 ]Braden                                                          [Page 6]