What are the limitations of 'instances'?

[Isaac Faber]

I have a trivial question that I think I already know the answer to.  What are the limitations of 'instances' of an app?  I know the default is 1 but does that mean that only one user can access it at a time?  I tried to change the number using the configureApp() command but get an error that the parameter is ready only (alpha test limitation?).  Any insight is appreciated. 

[Andy Kipp]

The answer to your question about how many users an instance can support is "it depends". An instance is virtual server dedicated for a particular application. The number of users an instance can support depends on the workload of the application. Since R is a single-threaded process, if a particular application is doing heavy computation other users will be forced to wait before their requests can be processed. Likewise, if the application is doing relatively little computation, many users can be serviced by a single R process.

To work around this limitation of R, ShinyApps can scale both the number of R processes per instance, and the number of instances. However, as you noticed, these feature are not enabled for the Alpha. If you are running into issues with application performance because of many users, I can work with you to address this.

Hope that helps,

-Andy

On Thu, Jun 19, 2014 at 12:08 PM, Isaac Faber <isaa...@gmail.com> wrote:

I have a trivial question that I think I already know the answer to.  What are the limitations of 'instances' of an app?  I know the default is 1 but does that mean that only one user can access it at a time?  I tried to change the number using the configureApp() command but get an error that the parameter is ready only (alpha test limitation?).  Any insight is appreciated. 

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