On 6/25/2021 8:58 PM, Eric Robinson wrote:
We can run 75 to 125 instances of tomcat on a single Linux server with 12 cores
and 128GB RAM. It works great. CPU is around 25%, our JVMs are not throwing
OOMEs, iowait is minimal, and network traffic is about 30Mbps. We're happy with
the results.
Now we're upping the ante. We have a 48-core server with 1TB RAM, and we're
planning to run 600+ tomcat instances on it simultaneously. What caveats or
pitfalls should we watch out for? Are there any hard limits that would prevent
this from working as expected?
I'm a lurker here. I have some experience with Tomcat, but most of my
experience is with other Apache projects.
I'm hoping that my question mirrors what the experienced folks around
here are thinking:
For something like this ... why are you running so many multiple
instances? Why not run one instance, or a few of them, and have each
one handle many many webapps? I bet you'll find that the overall memory
requirements go way down, because there will be far fewer instances of
Java running.
Maybe you've got good reasons for the architecture you have chosen ...
but it seems like a complete waste of resources to me.
Thanks,
Shawn
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