#28977: Change Local Memory Cache to Use LRU
-------------------------------------+-------------------------------------
Reporter: Grant Jenks | Owner: Grant
| Jenks
Type: New feature | Status: assigned
Component: Core (Cache system) | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Grant Jenks):
Josh asked on django-developers if I would run more extensive benchmarking
against the current changes. Here's the results of the locmem backend
using the python-diskcache benchmark harness. Note that these were
generated with only one process as locmem does no cross-process
synchronization.
The current implementation benchmark results:
{{{
========= ========= ========= ========= ========= ========= =========
=========
Timings for locmem
-------------------------------------------------------------------------------
Action Count Miss Median P90 P99 Max
Total
========= ========= ========= ========= ========= ========= =========
=========
get 88986 16526 12.159us 19.789us 28.849us 154.734us
1.266s
set 9030 0 14.067us 15.974us 30.994us 150.919us
134.134ms
delete 983 0 11.921us 13.828us 26.941us 32.663us
12.563ms
Total 98999
1.413s
========= ========= ========= ========= ========= ========= =========
=========
}}}
And the new implementation benchmark results:
{{{
========= ========= ========= ========= ========= ========= =========
=========
Timings for locmem
-------------------------------------------------------------------------------
Action Count Miss Median P90 P99 Max
Total
========= ========= ========= ========= ========= ========= =========
=========
get 88986 16526 5.007us 5.245us 14.067us 80.109us
449.330ms
set 9030 0 5.960us 7.153us 16.689us 111.103us
58.852ms
delete 983 0 4.053us 5.007us 8.821us 18.835us
4.200ms
Total 98999
512.381ms
========= ========= ========= ========= ========= ========= =========
=========
}}}
Displayed is four percentiles of timing: Median (50th), 90th, 99th, and
Max (100th). The results are better across the board with a 50% speedup
typical.
--
Ticket URL: <https://code.djangoproject.com/ticket/28977#comment:5>
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