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Add SYNAPSE_CACHE_FACTOR to README
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README.rst
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README.rst
@ -566,3 +566,20 @@ Building internal API documentation::
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python setup.py build_sphinx
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python setup.py build_sphinx
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Halp!! Synapse eats all my RAM!
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===============================
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Synapse's architecture is quite RAM hungry currently - we deliberately
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cache a lot of recent room data and metadata in RAM in order to speed up
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common requests. We'll improve this in future, but for now the easiest
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way to either reduce the RAM usage (at the risk of slowing things down)
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is to set the almost-undocumented ``SYNAPSE_CACHE_FACTOR`` environment
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variable. Roughly speaking, a SYNAPSE_CACHE_FACTOR of 1.0 will max out
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at around 3-4GB of resident memory - this is what we currently run the
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matrix.org on. The default setting is currently 0.1, which is probably
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around a ~700MB footprint. You can dial it down further to 0.02 if
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desired, which targets roughly ~512MB. Conversely you can dial it up if
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you need performance for lots of users and have a box with a lot of RAM.
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