Add cache doc in README.
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README.md
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README.md
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@ -148,3 +148,21 @@ Add a dedicated `host` section in `/etc/tomcat10/server.xml`:
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The `cache` directory must be readable by Tomcat.
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## About page caching
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The web pages are put in a HTML cache so they are not build again at each request.
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The HTML cache is automatically clear when the data directory is modified. The reload is quick.
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However, the organizations and services metrics pages are in cache. Just because the combinatorial is too large!
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Example:
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- (Summary,Generic,Specific,Web) x (Month, Weeks) x (ALL, last months, year1-year4) = 48 pages by item
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- 100 organizations + 300 services = 400 items
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- 400 items x 48 pages => ~20 000 pages
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- 200kB/page => 4GB in memory
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Metrics pages are so numerous than they have to build on demand.
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