Reducing Azure Redis 100% CPU
azureredisaccenture
type
Post
summary
Server side profiling Azure Redis to reduce bottlenecks
status
Published
tags
azure
redis
accenture
edited
May 24, 2024 04:53 PM
slug
redis-cpu
date
Nov 21, 2023
Scenario / Problem
- I need to speed up my application that uses Redis. Redis is at 100% CPU and is the bottleneck. Requests are coming from legacy applications that are difficult to read.
- Profiling the application using Jedis with JConsole is difficult.
Answer: Profile on the Azure Redis server instead!
SLOWLOG
From a redis-cli,
SLOWLOG GET will show you 
Use it to find the most troublesome calls to Redis. It can be reset with
SLOWLOG RESET to test isolated scenarios.
MONITOR
MONITOR will show you each call made to Redis. If this list is huge, you’ll need to reduce your calls!
Note: Running
MONITOR has the potential to slowdown throughput (in this case, by 50%), so keep that in mind if running performance tests while using the command. Exiting the shell that has MONITOR open will stop monitoring and end the overhead