MATLAB Web App Server maintains several running workers to help improve app startup time, which will consume memory even when no apps are in use. By default, the server prewarms 1/3 of the total maximum number of workers (maximum_sessions) at all times. For example, if a server is configured with maximum_sessions = 12, the server will attempt to maintain 4 prewarmed sessions whenever possible, in addition to any sessions in use.
There are two configuration options that can be used to limit the number of prewarmed workers:
- maximum_sessions (MaxWorkers): By default, MATLAB Web App Server prewarms approximately 1/3 of the maximum number of sessions. Increasing the maximum number of sessions using using webapps-config can increase the number of available sessions, both prewarmed and not. Note that it is recommended that you do not increase this value beyond the system requirements described here.
- MaxPrewarmedWorkers: This value can be set to limit the number of worker sessions prewarmed for a specific runtime version. This can be viewed and set in the "webapps.config" file located in your config folder and is unset by default. You may use this value to reduce prewarming of lesser-used runtimes; for example, if all R2022a web apps on your server are used infrequently, you may set this value to 0 to prevent prewarming of R2022b worker sessions: These apps can still be run by any available non-prewarmed workers, but no sessions will be reserved specifically for R2022b apps.<Runtime Path="/usr/local/MATLAB/MATLAB_Runtime/v912" MaxPrewarmedWorkers="0"/>
Please note that the MaxPrewarmedWorkers configuration is undocumented and may change without notice. It is also not recommended to edit the "webapps.config" directly. Use caution if you choose to follow this workflow.
