Port locks with high time under LCNT

Frank Muller frank.muller.erl@REDACTED
Thu Jan 2 17:37:55 CET 2020

Thanks to @Peti Gömöri, I was able to identify these Port locks:

Some of them are taking up to 6.7sec (6707846 usec) :-/

My application is serving static images by calling file:sendfile/2 (

Can someone please explain how I can avoid these locks or at least make
their impact lesser?


Mon 30 dec. 2019 at 19:58, Frank Muller <frank.muller.erl@REDACTED> wrote:

> I was able to find out which lock is used by run_queue:
> https://gist.github.com/frankmullerl/008174c6594ca27584ac7f4e6724bee5
> Question: how can I check the lock behind #Port<app@REDACTED> for
> example?
> /Frank
> Hi All
>> My custom-made web server which only serves only static files (a la Hugo:
>> https://gohugo.io/) is showing this under LCNT:
>> https://gist.github.com/frankmullerl/008174c6594ca27584ac7f4e6724bee5
>> Can someone explain how to dig further to understand what’s going on and
>> why these Port locks are taking so much time?
>> /Frank
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