fatum
Hi everybody!
I started to use elixir for hobby project (ad exchange) and stucked with performance of http clients (with ssl):
I get very low RPS (400) for requests with high latency (200-300msec) and high cpu usage (20% per core) on aws c5.large (2 cores) using elixir 1.6.4.
I tried different http clients (hackney, lhttpc, dlhttpc) with different pool sizes and still getting little improvement (lhttpc + dispcount gets the best numbers)
Is it OK for elixir/erlang http clients to have such low performance?
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Error tracking, logs, APM, uptime and cron monitoring in one dev-friendly platform. Find and fix problems before your users notice.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ai
- #ecto-query
- #elixirconf-us
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #metaprogramming
- #hex
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Bringing learning, work and compliance together since 1987.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
First Post!- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
idi527
Maybe try GitHub - lpgauth/buoy: High-Performance Erlang HTTP 1.1 Client · GitHub … That’s what I usually use when I need performance, but I don’t think I ever make requests with such a high latency.
Note that it doesn’t implement the full http/1.1 spec: GitHub - lpgauth/buoy: High-Performance Erlang HTTP 1.1 Client · GitHub.
But it is the most performant http/1.1 client afaik: GitHub - lpgauth/httpc_bench: Erlang HTTP client benchmarks · GitHub.
Most Liked
mischov
I’ve often seen 200-300msec latency for HTTP client requests with httpc or hackney, so that’s about what I’d expect. I assume you’re using keep-alives, etc, as appropriate.
What kind of latency are you used to having from HTTP clients in other languages?
Edit: Or is it just the throughput that’s unexpected?
Last Post!
idi527
I’d need to measure it. Sorry, don’t have any numbers right now. The server was a preemtible alpine vm on google cloud, and the requests from it were made to google storage api, so latencies were pretty low.