mirror of
https://github.com/Hopiu/django-cachalot.git
synced 2026-05-04 10:54:42 +00:00
Adds an introduction to the benchmark.
This commit is contained in:
Bertrand Bordage
parent
b01000bb40
commit
3da5c92eaa
16 changed files with 5239 additions and 5208 deletions
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@ -85,6 +85,10 @@ def write_conditions():
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))
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with io.open(os.path.join('benchmark', 'conditions.rst'), 'w') as f:
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f.write('In this benchmark, a small database is generated, '
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'and each test is executed %s times '
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'under the following conditions:\n\n' % Benchmark.n)
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def write_table_sep(char='='):
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f.write(''.ljust(20, char) + ' ' + ''.ljust(50, char) + '\n')
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write_table_sep()
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@ -112,8 +116,9 @@ class AssertNumQueries(CaptureQueriesContext):
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class Benchmark(object):
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def __init__(self, n=20):
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self.n = n
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n = 20
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def __init__(self):
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self.data = []
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def bench_once(self, context, num_queries, invalidate_before=False):
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- filebased is 1.2× slower then 8.6× faster
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- locmem is 1.1× slower then 9.0× faster
|
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- memcached is 1.1× slower then 6.9× faster
|
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- pylibmc is 1.1× slower then 7.1× faster
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- redis is 1.1× slower then 8.2× faster
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- filebased is 1.2× slower then 8.8× faster
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- locmem is 1.1× slower then 9.3× faster
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- memcached is 1.1× slower then 7.5× faster
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- pylibmc is 1.1× slower then 6.6× faster
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- redis is 1.1× slower then 7.6× faster
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|
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@ -1,3 +1,5 @@
|
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In this benchmark, a small database is generated, and each test is executed 20 times under the following conditions:
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|
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==================== ==================================================
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CPU Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
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RAM 12281228 kB
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Before Width: | Height: | Size: 37 KiB After Width: | Height: | Size: 37 KiB |
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Load diff
|
Before Width: | Height: | Size: 219 KiB After Width: | Height: | Size: 219 KiB |
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Load diff
|
Before Width: | Height: | Size: 219 KiB After Width: | Height: | Size: 219 KiB |
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@ -1,3 +1,3 @@
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- mysql is 1.9× slower then 0.9× faster
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- postgresql is 1.1× slower then 13.6× faster
|
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- sqlite is 1.1× slower then 9.4× faster
|
||||
- mysql is 2.1× slower then 0.9× faster
|
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- postgresql is 1.1× slower then 14.2× faster
|
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- sqlite is 1.1× slower then 8.5× faster
|
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|
|
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File diff suppressed because it is too large
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|
Before Width: | Height: | Size: 219 KiB After Width: | Height: | Size: 219 KiB |
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@ -3,6 +3,19 @@ Benchmark
|
|||
|
||||
.. contents::
|
||||
|
||||
Introduction
|
||||
............
|
||||
|
||||
This benchmark does not intend to be exhaustive nor fair to SQL.
|
||||
It shows how django-cachalot behaves on an unoptimised application.
|
||||
On an application using perfectly optimised SQL queries only,
|
||||
django-cachalot may not be useful.
|
||||
Unfortunately, most Django apps (including Django itself)
|
||||
use unoptimised queries. Of course, they often lack useful indexes
|
||||
(even though it only requires 20 characters per index…).
|
||||
But what you may not know is that
|
||||
**the ORM currently generates totally unoptimised queries** [#]_.
|
||||
|
||||
Conditions
|
||||
..........
|
||||
|
||||
|
|
@ -70,3 +83,17 @@ Redis
|
|||
~~~~~
|
||||
|
||||
.. image:: ../benchmark/cache_redis.svg
|
||||
|
||||
|
||||
|
||||
.. [#] The ORM fetches way too much data if you don’t restrict it using
|
||||
``.only`` and ``.defer``. You can divide the execution time
|
||||
of most queries by 2-3 by specifying what you want to fetch.
|
||||
But specifying which data we want for each query is very long
|
||||
and unmaintainable. An automation using field usage statistics
|
||||
is possible and would drastically improve performance.
|
||||
Other performance issues occur with slicing.
|
||||
You can often optimise a sliced query using a subquery, like
|
||||
``YourModel.objects.filter(pk__in=YourModel.objects.filter(…)[10000:10050]).select_related(…)``
|
||||
instead of ``YourModel.objects.filter(…).select_related(…)[10000:10050]``.
|
||||
I’ll maybe work on these issues one day.
|
||||
|
|
|
|||
|
|
@ -1,8 +1,5 @@
|
|||
What still needs to be done
|
||||
---------------------------
|
||||
|
||||
For version 1.0
|
||||
...............
|
||||
|
||||
- Cache raw queries
|
||||
- Test multi-location caches
|
||||
- Test multi-location caches if possible
|
||||
|
|
|
|||
Loading…
Reference in a new issue