Mark and Jalaj,
On 3/3/21 02:59, Mark Thomas wrote:
On 02/03/2021 16:55, Jalaj Asher wrote:
------- Just to clarify when I disable cachingallowed setting does it
stop the compilation in the tomcat i.e the files I see in the work
folder, because I still see the compiled files there. Wanted to know
if it will force recompiles on each access .
No. It does not force a recompile on each access. JSPs need to be read
completely twice during the compilation phase. In memory caching
improves the performance of the second read. How noticeable this is will
depend on your application and the host where Tomcat is running.
I would argue that a production site shouldn't be getting much in the
way of changes to JSPs and therefore the caching for JSP sources
shouldn't really matter at all.
------- Can you share some insight on the OS level caching ?
Primarily where would OS be caching it ?
I'd expect there to be some form of read cache for disk access. The
split between OS and hardware will be system dependent.
Any decent OS will use all available memory for disk caching. Using the
Java heap for caching just adds a layer of priority in favor of your
application's resources.
-chris
-----Original Message-----
From: Mark Thomas <ma...@apache.org>
Sent: Tuesday, March 2, 2021 2:50 AM
To: users@tomcat.apache.org
Subject: Re: Reg: caching allowed setting in tomcat
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On 01/03/2021 16:03, Jalaj Asher wrote:
I see that the cachingallowed setting is primarily for static content
caching.
But considering my application we have a lot of static content data
resulting in almost 100 to 150 MB of heap memory being used because
of this caching.
1. Is there any way to do this caching on disk ?
What would be the point of that? That static content is already on disk.
It is being cached in memory to improve performance.
1. My static content is being cached in the browser on client
end . any negative repercussions that I should be aware off if I
disable caching on the tomcat end ? for eg will it impact jsp
compilations on the tomcat ? I assume not as they are not static but
wanted to confirm.
JSP source is static content. Disabling caching may impact JSP
compilation time but OS level caching may mitigate that. There many
variables that impact performance. The only way to get true sense of
the impact is to measure performance with caching enabled and disabled
and compare the two.
Generally, deploying your application as a WAR file with
unpackWARs="false" has the biggest negative impact on performance. If
you deploy with unpackWARs="true" or as a directory then I suspect the
difference will be minimal.
Mark
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