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138 VOTE
Status Assessment
Workspace Domino
Created by Guest
Created on Jul 17, 2018

RELATED IDEAS

Optimized View Rebuild without view_rebuild_dir completely in RAM

Today you have to specify a view_rebuild_dir to get optimized view rebuild.
With 64bit it should be perfectly OK to have the complete processing in memory without a temp-file.
When you look into the usage of the view_rebuild_dir (which we move to tmpfs on Linux for better performance) the usage is quite low.

But you have to provide much more "disk" space because Domino uses an estimated size for the space that is too high in some cases. So you need more space to avoid a fallback to the slower view update method.

The new idea is to have the whole processing in memory now that Domino 10 is 64bit only


Daniel Nashed  [ https://blog.nashcom.de ]

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  • Guest
    Reply
    |     Jan 3, 2021

    @Friedhelm!
    This isn't the main point! You have to configure it and it is different per platform. Creating a file always has an overhead and it needs cleanup. The functionality has been implemented at a time where we had not much memory available. I would also not fully trust those type of function in Windows! The file caching isn't implemented in the way I would expect it. Domino had to add work-arounds to avoid Windows memory management issues before!

    Also Domino is cross platform and this would be a cross platform solution. On Linux you have tempfs but I still this needs to be configured. And also keeping track of temp files, creating them and removing them is overhead not needed.

    A simple memory allocation with a fall-back to the old method would be much easier.

    -- Daniel

  • Guest
    Reply
    |     Nov 5, 2018

    +1

  • Guest
    Reply
    |     Aug 16, 2018

    I think on Windows this is not necessary as long as the temp file is created properly with the right flags set:

    FILE_ATTRIBUTE_TEMPORARY
    256 (0x100)
    		 The file is being used for temporary storage.

    For more information, see the Caching Behavior section of this topic.

    This causes Windows to keep changes to the file as long as possible in Cache, postponoing any writes as long as possible. This is more flexible than using RAM only. 

    I however suspect current Domino does not use the right attribute settings for view rebuils.

    Regards, Friedhelm Klein, Axians IT Solutions

  • Guest
    Reply
    |     Aug 6, 2018

    In 2010 we dramatically improved performance of our Domino servers on Linux by moving view rebuild operations to RAM disk.

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