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celery: Reorder celery imports to fix case where celery tasks were being registered before celery config was setup. Added comments to make this clear so we don't chase this problem in the future until it is refactored

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tuning-mount-cache-memory.rst
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r1 .. _data-mem:
Mount Cache Folders To Memory
-----------------------------
To increase the performance of folders containing cache data, you can mount
them to memory. The following folders specified in the :file:`rhodecode.ini`
file would benefit from this.
.. code-block:: ini
cache_dir = %(here)s/data
search.location = %(here)s/data/index
Use the following Ubuntu example to mount these to memory, or see your
particular |os| instructions. The expected performance benefit is
approximately 5%. You should ensure you allocate an adequate amount of memory
depending on your available resources.
.. code-block:: bash
# mount to memory with 2GB limit and 755 write permissions
mount -t tmpfs -o size=2G,mode=0755 tmpfs /home/user/.rccontrol/enterprise-1/data
mount -t tmpfs -o size=2G,mode=0755 tmpfs /home/user/.rccontrol/enterprise-1/data/index
.. _move-tmp:
Move ``tmp`` to TMPFS
---------------------
|RCE| components heavily use the :file:`/tmp` folder, so moving your
:file:`/tmp` folder into to a RAM-based TMPS can lead to a noticeable
performance boost.
.. code-block:: bash
# mount tmp to memory with 2GB limit and 755 write permissions
mount -t tmpfs -o size=2G,mode=0755 tmpfs /tmp
For more information about TMPFS, see the documentation `here`_.
.. _here: https://wiki.archlinux.org/index.php/Tmpfs