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Annotation of 42BSD/ingres/doc/other/lockdev.nr, revision 1.1

1.1     ! root        1: .ds HE 'HOW TO INSTALL CONCURRENCY DEVICE''PAGE %'
        !             2: .so nmacs
        !             3: .ce
        !             4: Instructions for installing the INGRES lock device in UNIX
        !             5: 
        !             6: .ce
        !             7: May 19, 1983
        !             8: .sp 3
        !             9: INGRES version 7.1 has a fully implemented concurrency control
        !            10: mechanism.
        !            11: The INGRES system sets and clears locks by writing to
        !            12: a server named "ingreslock".
        !            13: If the socket cannot be opened for writing, INGRES
        !            14: runs without any concurrency control.
        !            15: 
        !            16: Initially it is advisable to bring up INGRES without
        !            17: the concurrency device.
        !            18: If planned usage of the INGRES system requires concurrency
        !            19: control then the server "ingreslock" must be installed
        !            20: into your UNIX system.
        !            21: 
        !            22: This document describes the procedure for installing
        !            23: the UNIX server for
        !            24: "ingreslock".
        !            25: 
        !            26: .sh 1
        !            27: Log in as root.
        !            28: .sh 1
        !            29: Compiling the concurrency device
        !            30: .PS
        !            31: .dn
        !            32: change directory to ../source/support
        !            33: .PS
        !            34: The concurrency device consists of three
        !            35: files: .../source/support/ildr.c
        !            36:  .../source/h/ildr.h
        !            37: and ../source/support/init_socket.c
        !            38: 
        !            39: compile the lock driver
        !            40: .nf
        !            41:        make lockd
        !            42: 
        !            43: .fi
        !            44: .sh
        !            45: Installation Parameters
        !            46: .PS
        !            47: There are several parameters in ildr.h that can be set by
        !            48: the user.  These include:
        !            49: 
        !            50: .nf
        !            51:        NLOCKS - number of locks
        !            52:        PLOCKS - page locks
        !            53:        RLOCKS - relation locks
        !            54:        DLOCKS - data base locks
        !            55: 
        !            56: .fi
        !            57: NLOCKS is the maximum number of locks permissible.
        !            58: It determines the size of the lock table.
        !            59: PLOCKS is the maximum number of page, relation and data base
        !            60: locks.
        !            61: RLOCKS is the maximum number of relation and data base locks.
        !            62: DLOCKS is the maximum number of data base locks.  Only
        !            63: DLOCKS INGRESes can be active at one time.
        !            64: 
        !            65: The following conditions must hold to protect against
        !            66: deadlock due to lock table overflow:
        !            67: 
        !            68: .nf
        !            69:        NLOCKS > PLOCKS > RLOCKS > DLOCKS + 6
        !            70: 
        !            71: .fi
        !            72: The extra number of RLOCKS are required inorder
        !            73: to be able to run 6-variable queries.
        !            74: We recommend first setting DLOCKS and then setting the other parameters
        !            75: as follows:
        !            76: 
        !            77: .nf
        !            78:        RLOCKS = 2*DLOCKS + 6
        !            79:        PLOCKS = RLOCKS + 3
        !            80:        NLOCKS = PLOCKS + 1
        !            81: .fi
        !            82: 
        !            83: For example, to reduce the size of the lock table, one could set
        !            84: DLOCKS = 2, RLOCKS = 10, PLOCKS = 13, NLOCKS = 14.
        !            85: In this case, only 2 people could be running ingres at one time.
        !            86: 
        !            87: As another example, to allow for more concurrent INGRESes, one could set
        !            88: DLOCKS = 20, RLOCKS = 46, PLOCKS = 49, NLOCKS = 50.
        !            89: This scenario would allow for twenty simultaneous INGRES users.
        !            90: 
        !            91: The memory required by the lockdriver is 
        !            92: 1008 bytes in the text segment and
        !            93: 36 + 18 * NLOCKS in the data and BSS segments.
        !            94: 
        !            95: .sh
        !            96: Copy the server
        !            97: .PS
        !            98: Copy the lock server to where the servers
        !            99: are kept on your system.
        !           100: 
        !           101: .nf
        !           102:        cp lockd  /etc/lockd
        !           103: 
        !           104: .fi
        !           105: .sh 1
        !           106: Add the service to /etc/services
        !           107: .PS
        !           108: You should have an entry
        !           109: 
        !           110: .nf
        !           111: 
        !           112:        ingreslock      1524/tcp                # Ingres concurrency driver
        !           113: 
        !           114: .fi
        !           115: 
        !           116: .PS
        !           117: In your /etc/services file. Note that the number (in this case 1524) need only
        !           118: be unique among your servers, and does NOT have to be 1524 (we use it though).
        !           119: .sh 1
        !           120: Put lock server in /etc/rc.local thusly:
        !           121: 
        !           122: .nf
        !           123:        /etc/lockd & echo -n ' lockd' > /dev/console
        !           124: .fi
        !           125: 
        !           126: .PS
        !           127: This ensures that the lock server is always running when the system
        !           128: is up.
        !           129: .sh 1
        !           130: Done.
        !           131: .PS
        !           132: INGRES will now use the "ingreslock" service for its
        !           133: concurrency control.
        !           134: A simple way to verify this is to try running
        !           135: (for example) "purge" on a data base while
        !           136: anyone is running "ingres" on the same data base.

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