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Download stuck at 99% using an application on apache

Discussion in 'Apache' started by rahulsarma, Sep 25, 2009.

  1. #1

    We have knowledgeTree php application hosted on Apache/2.2.11 (Win32) mod_ssl/2.2.11 OpenSSL/0.9.8i PHP/5.2.8.

    The application is used by users to donwload pdf documents (average size 3MB).

    Very frequently we are getting issues where the download is stuck at 99% on client machines. If its stuck for 1 user than it gets stuck for all. The only choice remaining is to restart apache.
    We have not seen any pattern to it.
    Here are some configurations we have:

    Windows server standard 2003 x64
    Intel Xeon
    8GB RAM
    Mysql 5.0
    user load: 9 concurrent users and 300 in a day. Users may on a average download 20MB of documents.
    PHP memory setting: 3072M

    Timeout 200
    MaxKeepAliveRequests 5000
    KeepAliveTimeout 10
    KeepAlive On

    http-mpm.conf -->
    <IfModule mpm_winnt_module>
    ThreadsPerChild 1920
    MaxRequestsPerChild 10

    We have tried with all combinations of MaxRequestsPerChild from 0 - 10000. and issue still persists.

    During the time its stuck the server-status doesnt show anything unusal i.e. lots of idle threads.

    Interestingly we had the issue with just 1 user downloading 3MB documents itself. So load doesnt seem to be a factor also.

    CPU usage doesnt go beyond 13%
    RAM PF usage remains at 3.3GB

    We are totally baffled. The issue is not reproducible on any other environment.

    Any help??

    rahulsarma, Sep 25, 2009 IP