RSelenium concurrent users for multiple scenarios on Shiny

I am trying to do a charge test with RSelenium on my deployed Shiny application. Several users connect to the adress and do random tasks at the same time.

I have searched doParallel but the number of concurrent process is limited by numbers of core - 1.

I have tried the following command line to start N process in the background at the same time. A number is given as parameter to define browser's port. It is working until 3 process but over some process fail and are not always the same.

'start /b "P1" Rscript R/run_tests.R 1 &
start /b "P2" Rscript R/run_tests.R 2 &
start /b "P3" Rscript R/run_tests.R 3 &
start /b "P4" Rscript R/run_tests.R 4 &
start /b "P5" Rscript R/run_tests.R 5'

run_tests open a new web driver and navigate on the webpage.

A solution would be to ask several colleagues to run this code for 3 process but I would like to reach 20 users.

Answer on Windows will be more appreciated but Linux is not a problem. Do you know the proper way to do it with RSelenium ? Thanks a lot for any clue.

I have some experience with JMeter but it seems not appropriate for your case, as written here.

Shiny relies on Javascript to respond to user interactions and communicate with R as opposed to RESTful HTTP calls. This means standard load testing frameworks like JMeter do not accurately simulate load.

Please have a look at the info for shinyloadtest. I have not used it personally, but according to the documentation it can be installed under Windows and supports:

Record a typical user session for the app.

Replay the session in parallel, simulating many simultaneous users accessing the app.

Analyze the results of the load test and determine if the app performed well enough.

Hope this helps.

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