[opencms-dev] Flex Cache Configuration Options

[Jochen Graf]

Hi Ramon,

maxcachebytes is the total size of the cache that is never exceeded. 
This means, if the cache is full already, and another new element is 
added to the cache, the least recently used elements are deleted from 
the cache. It is deleted until the cache has a size of avgcachebytes again.

If you at some time increase the maxcachebytes setting, you can decide 
whether to increase maxentrybytes or maxentrykeys or both. If you know 
that your JSPs are relatively small in size but appear in many different 
variations (depending on language, request params, and so on), it makes 
sense to increase maxkeys and leave maxentrybytes as is. On the other 
hand, if you know that your JSPs appear in relatively less variations 
but your JSPs are relatively large, you would increase maxentrybytes and 
would leave maxkeys as is.

Hope this helps

Jochen



Am 24.11.22 um 17:37 schrieb Ramon Gavira Sáenz via opencms-dev:
>
> I have check thin documentation page: 
> https://documentation.opencms.org/opencms-documentation/template-development/caching-in-opencms/the-flex-cache/index.html, 
>
>
> But, Can anyone explain a little deeper what are this configs params for?
>
> *maxcachebytes*
>
> The maximum amount of server memory used by the Flex cache in bytes. 
> The amount of available server memory is the critical factor here and 
> has to be considered carefully.
>
> *avgcachebytes*
>
> The average amount of server memory used by the Flex cache in bytes.
>
> *maxentrybytes*
>
> The maximum size of a single cache entry in bytes.
>
> *maxkeys*
>
> The maximum number of cached page variations in the Flex cache.
>
> The default config is:
>
> <flexcache>
>
> <cache-enabled>true</cache-enabled>
>
> <cache-offline>false</cache-offline>
>
> <maxcachebytes>8000000</maxcachebytes>
>
> <avgcachebytes>6000000</avgcachebytes>
>
> <maxentrybytes>400000</maxentrybytes>
>
> <maxkeys>2000</maxkeys>
>
> </flexcache>
>
> And Documentation explain that thats means the following:
>
> The default settings of the Flex cache parameters after installing 
> OpenCms are:
>
>  1. The Flex cache is enabled
>  2. The cache for offline projects is disabled
>  3. The Flex cache uses 8mb memory for the cached pages or a maximum
>     of 2000 cached page variations in total.
>
> Point 1 and 2 are ok, but what about 3? What is exactly a cached page? 
> What is avgcachebytes means in config? And maxentrybytes?
>
> Thanks in advance!
>
>
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