during high load I see the rest api or even the welcome page localhost:4000 returns 504 Gateway Time-out error, I am usng OTP 20. Any clues how to improve performance Elixir 1.7.3 (compiled with Erlang/OTP 20)

the clients are mobile apps updating data and also mobile and web clients accessing data from phoenix. We have paid plans

It’s still good to test each layer as that will tell you where the failures are happening. It’s extremely unlikely to be a fault of Elixir as this is the kind of work that the BEAM is designed for, it doesn’t fault in these ways, and it doesn’t return 504’s unless the program itself explicitly does…

I am currently checking with cloudflare support to check at their end. when I check top on the vm, I see beam is consuming 590.7 %cpu, is this normal on 16vcpu instance ?

[image] AyubOpen: when I check top, I see beam is consuming 590.7 %cpu, is this normal on 16vcpu instance ? Using 6vcpu’s worth on a 16vcpu is definitely not saturated so the BEAM would be responding just fine then. The overall usage is dictated primarily by the application code though, so t…

[image] OvermindDL1: :etop.start() I enterd this after starting the shell, but do not see any info. The clients post their locations every 5 seconds and there are other clients accessing this location information. the post api saves the lat,lon in the postgres db and the other mobile and web …

[image] AyubOpen: I enterd this after starting the shell, but do not see any info. Hmm, you should immediately see a lot of info, like here is what I get: iex(devserver2@127.0.0.1)2> :etop.start() ======================================================================================== 'dev…

I type erl and I get the below shell Eshell V9.0 (abort with ^G) 1> here I type :etop.start() not sure if I am in the correct shell

Oh that’s erl! You’ll want to run etop:start() instead there, that’s the old Erlang shell. :slight_smile: Use iex for the elixir shell in comparison. And don’t forget to connect a remote shell to the other node unless you are spooling up the full server. If you are using distillery it has a bui…

I will try it out, I use the below command to build and execute mix deps.get MIX_ENV=final mix compile MIX_ENV=final mix release

[image] OvermindDL1: :etop.start() I will have to investigate this further,I tried it on dev and if use iex and then try to kill the shell its shutting down the who beam process :slight_smile:

Elixir rest api returning 504 Gateway Time-out

Questions & Help Questions

axelson February 5, 2019, 12:01am 20

Yeah that was my thinking exactly.