AEM Site users report that the web content pages render very slowly. An Architect notices that the CPU usages of the AEM Publish instances are spiking and reviews the following entry in the log:
[Frt Nov 27 23:11:00 2019] [I] [pid 16004 (tid 140134145820416)] Current cache hit ratio: 47.94 %
What should the Architect do to increase the dispatcher cache ratio and prevent the AEM Publish CPU usage spikes?
According to Adobe Experience Manager documentation5, dispatcher is a caching and load balancing tool that can be used to improve performance and security of AEM sites.Dispatcher cache configuration can be adjusted using various properties in the dispatcher.any file6. Creating a cron job that will delete the dispatcher cache on a regular basis is not a good idea as it will reduce the cache hit ratio and increase the load on AEM servers.
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