This is an IO perf issue so you need to compare before and after the patch.
1) Install a moodle site using the relevant commit for 310 or master:
master: 46f977a8b (Weekly release, October 6th)
310: d70cfda57 (On demand October 9th)
i.e.
mdk create -t -v master -n mysite
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Then, checkout the relevant commit:
Then, run through the installation.
2) Next run redis using docker:
docker run --net=host --name myredis -d redis
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3) Set the session handler to use redis:
$CFG->session_handler_class = '\core\session\redis';
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$CFG->session_redis_host = '127.0.0.1';
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$CFG->session_redis_port = 6379; // Optional.
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$CFG->session_redis_database = 0; // Optional, default is db 0.
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$CFG->session_redis_prefix = ''; // Optional, default is don't set one.
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Ideally do not put anything else in redis such as MUC to not confound the numbers
Note: You'll need to also have redis support on your php installation, if you do not already:
sudo apt-get install php-redis
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sudo service apache2 restart
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4) Shell into your running redis server:
docker exec -it myredis /bin/bash
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5) Run the redis-cli
6) Purge redis stats from within redis-cli
7) Now perform a simple pattern such as login, view dashboard, view a specific course, view the calendar, etc.
Just make sure to remember the pattern of page views you used.
8) Now look at the redis stats (again from within redis-cli)
Look for this field and note the number:
E.g.
total_net_input_bytes:117893
9) Now , checkout master, perform the site upgrade.
10) Repeat the process in steps 6,7,8 and you should see some drop in inbound IO from the avoided writes.
Eg an example test run:
Before the patch:
total_net_input_bytes:117893
total_net_output_bytes:85687
After the patch:
total_net_input_bytes:85840
total_net_output_bytes:86600
Verify there is a drop in total_net_input_bytes when compared to the earlier pre-patch run.
Improvement
Minor
