Concurrent file access: Any known problems (2.2.9) ?

From: Joerg Bruehe (joerg@sql.de)
Date: Fri Jun 16 2000 - 02:42:48 PDT

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    Message-ID: <3949F698.4A985E6A@sql.de>
Date: Fri, 16 Jun 2000 11:42:48 +0200
From: Joerg Bruehe <joerg@sql.de>
Subject: Concurrent file access: Any known problems (2.2.9) ?

    Hi to all !

    I use SuSE AXP 6.1 (kernel 2.2.9) on an AlphaStation 200 4/166.

    I have a family of processes sharing code and data (SHM segment)
    accessing the same file, synchronisation done by memory-internal
    data structures and semaphores.
    The file is binary, transfer unit is 4 kB throughout.

    During a test run, one of the processes reads a page (4 kB) from
    the file which is internally inconsistent; it looks as if only
    part of the page had been written to the file (second half missing ?).
    This has happened on all multi-user runs till now (11 active
    processes each).

    Are there any known issues in this area ?
    Paging might also be involved ...

    Thank you for hints,
    Joerg Bruehe 

    -- 
Joerg Bruehe, SQL Datenbanksysteme GmbH, Berlin, Germany
     (speaking only for himself)
mailto: joerg@sql.de

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