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Re: $Session object

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  • Chris Marschall
    Gentlemen, Thanks for the prompt feedback. Of course, the lack of shared memory (multi-threading) explains why it would have to commit all state information
    Message 1 of 6 , Feb 4, 2004
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      Gentlemen,

      Thanks for the prompt feedback.

      Of course, the lack of shared memory (multi-threading) explains why it
      would have to commit all state information for each request.

      Thanks also for the DB_File information.

      Much appreciated.

      Regards,

      Chris.

      On Wed, 4 Feb 2004, Josh Chamas wrote:

      > Helmut Zeilinger wrote:
      > > Hi Chris,
      > >
      > > the reason for the data size limit is, that the SDBM hash size
      > > limit is 1024 bytes for the key + the value.
      > >
      > > You can store more data if you use DB_File or MLDBM::Sync::SDBM_File
      > > for storing the data.
      > >
      > > But see "man Apache::ASP", Section "State Management" (StateDB).
      > >
      > > Regards
      > >
      > > Helmut
      > >
      >
      > Helmut is correct. I would like to add that since mod_perl & Apache
      > are multi-process, they don't share memory, so all this session state
      > is stored to disk to allow multi-process data sharing. So basically,
      > you want to keep the data going to disk lighter, and only store enough
      > to allow your objects to be recreated in memory each request via
      > constructors, & not serialize the object to disk/$Session fully each
      > request/read/write.
      >
      > Consider that each time one does:
      >
      > $Session->{object} = {};
      >
      > you just wrote to disk. Though DB_File holds more than SDBM_File,
      > it is much slower to do basic read/write operations for smaller
      > bits of data, and accessing large blocks of data is obviously slow.
      >
      > Definitely read the MLDBM::Sync man page for a further analysis of this
      > which is the internal state manager used for Apache::ASP.
      >
      > Regards,
      >
      > Josh
      >
      > ________________________________________________________________
      > Josh Chamas, Founder phone:925-552-0128
      > Chamas Enterprises Inc. http://www.chamas.com
      > NodeWorks Link Checker http://www.nodeworks.com
      >

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