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rnwood / smtp4dev

smtp4dev - the fake smtp email server for development and testing
BSD 3-Clause "New" or "Revised" License
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Extreme memory use when run as Windows service #979

Closed DanielSpindler83 closed 2 years ago

DanielSpindler83 commented 2 years ago

Configured to run as a Windows Service. Receiving around 1000 emails - the memory use balloons up over 3Gb and is never released. Set Number of messages to keep as 100 Set Number of session to keep at 10 Is this expected?

jafin commented 2 years ago

Hi @DanielSpindler83 , which version of the app are you running? Some metrics from a prior patch, tested with 5000 messages app ran to about 1.2gb/ram and then got recycled, the patch reduced this further. See https://github.com/rnwood/smtp4dev/pull/714

This patch is in the CI builds, not in the 3.1.3.2 release.

Message size payload was about 2kb. Do you know what size your messages payload typically is?

There could definitely be something else going on, any more info you can provide would be useful.

DanielSpindler83 commented 2 years ago

Thanks @jafin , I was indeed using an old build. I was using the April build Rnwood.Smtp4dev-win-x64-3.1.3.2.zip. Our message size is not large, but its html with some images - so around 20-50Kb per email - no attachments. We have batch email runs that often run between 500 -1500 emails. I am using Windows Server 2016 on latest build\patch. I was using a dedicated account on the Windows Service, and could confirm there was a database.db - so not running in memory. I was seeing the app basically use all memory that was available. and never release it.

I have moved to latest build and will keep an eye on it and re-raise if still an issue.

Thanks again.