[doc] add doc on benchmark sync tests sizes

Closes: #8884

1 files changed, 60 insertions, 0 deletions

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+Benchmarks
+==========
+
+Soledad has a set of benchmark tests to assess the time and resources taken by
+various tasks. 
+
+Results of benchmarking can be seen in https://benchmarks.leap.se/.
+
+Sync size statistics
+--------------------
+
+Currenly, the main use of Soledad is to synchronize client-encrypted email
+data. Because of that, it makes sense to measure the time and resources taken
+to synchronize an amount of data that is realistically comparable to a user's
+email box.
+
+In order to determine what is a good example of dataset for synchronization
+tests, we used the size of messages of one week of incoming and outgoing email
+flow of a friendly provider. The statistics that came out from that are (all
+sizes are in KB):
+
++--------+-----------+-----------+
+|        | outgoing  | incoming  |
++========+===========+===========+
+| min    | 0.675     | 0.461     |
++--------+-----------+-----------+
+| max    | 25531.361 | 25571.748 |
++--------+-----------+-----------+
+| mean   | 252.411   | 110.626   |
++--------+-----------+-----------+
+| median | 5.320     | 14.974    |
++--------+-----------+-----------+
+| mode   | 1.404     | 1.411     |
++--------+-----------+-----------+
+| stddev | 1376.930  | 732.933   |
++--------+-----------+-----------+
+
+Test scenarios
+--------------
+
+Ideally, we would want to run tests for a big data set, but that may be
+infeasible given time and resource limitations. Because of that, we choose a
+smaller data set and suppose that the behaviour is somewhat linear to get an
+idea for larger sets.
+
+Supposing a data set size of 10MB, some possibilities for number of documents
+and document sizes for testing download and upload are:
+
+* 10 x 1M
+* 20 x 500K
+* 100 x 100K
+* 200 x 50K
+* 1000 x 10K
+
+The above scenarios all have documents of the same size. If we want to account
+for some variability on document sizes, it is sufficient to come up with a
+simple scenario where the average, minimum and maximum sizes are somehow
+coherent with the above statistics, like the following one:
+
+* 60 x 15KB + 1 x 1MB