Can I use Caddy for a high-traffic site?


(George) #21

Here’s updated Caddy 0.9 benchmark numbers for h2load HTTP/2 based load tetsing https://community.centminmod.com/posts/34367/

For h2load single thread

For Centmin Mod Nginx 1.11.3 HTTP/2 port 443 = 11,322.50 req/s average

echo "CentminMod.com Nginx 1.11.3 HTTP/2 h2load stress test"; sleep 30; for i in {1..3}; do /usr/local/bin/h2load -c1000 -m100 -n50000 -v https://domain1.com:443 > h2load.$i.log; cat h2load.$i.log | awk '/finished in/ {print $4 " req/s "} /requests: / {print ($8/$2*100)"% completed"}' | tr -d '\n'; echo; sleep 30; done;
CentminMod.com Nginx 1.11.3 HTTP/2 h2load stress test
8896.39 req/s 100% completed
17788.95 req/s 100% completed
7282.18 req/s 100% completed

For Caddy 0.9 HTTP/2 port 448 = 3,751.71 req/s average

echo "Caddy 0.9 HTTP/2 h2load stress test"; sleep 30; for i in {1..3}; do /usr/local/bin/h2load -c1000 -m100 -n50000 -v https://domain1.com:448 > h2load.$i.log; cat h2load.$i.log | awk '/finished in/ {print $4 " req/s "} /requests: / {print ($8/$2*100)"% completed"}' | tr -d '\n'; echo; sleep 30; done;
Caddy 0.9 HTTP/2 h2load stress test
3908.97 req/s 100% completed
3504.25 req/s 100% completed
3841.91 req/s 100% completed
  • CentminMod.com Nginx 1.11.3 HTTP/2 h2load stress test cpu load peaked at 0.60 and 548MB total memory used
  • Caddy 0.9 HTTP/2 h2load stress test cpu load peaked at 1.57 and 1289MB total memory used

For h2load 2 threads https://community.centminmod.com/posts/34379/

  • CentminMod.com Nginx 1.11.3 HTTP/2 h2load stress test cpu load peaked at 0.62 and 551MB total memory used
  • Caddy 0.9 HTTP/2 h2load stress test cpu load peaked at 1.86 and 1393MB total memory used

Note, Nginx was with LibreSSL 2.4.2 compiled but seems OpenSSL 1.0.2h and 1.1.0 would have even better performance https://community.centminmod.com/threads/openssl-1-1-0-pre6-vs-openssl-1-0-2h-vs-openssl-1-0-1e-vs-libressl-2-4-2-vs-libressl-2-3-6.8272/


(Michael) #22

Thanks for the insights. Really awesome. Would love to see some stats with some plugins like rewrite, proxy, minify.


(Matt Holt) #23

Yes, thanks for running the tests!

Would also love to see some optimizations contributed :wink:


(George) #24

Unfortunately not a Golang programmer :blush:


(George) #25

Yeah that would be next up i suppose :slight_smile:


(Michael) #26

As a general suggestion.
Kubernetes does performance tests as per commit and/or PR and/or release.
It would be great to see the performance impact automatically on PRs/releases I assume.
I will keep it on my “could be done list” until I have time, for anyone faster go for it please.


(The Scorpion) #27

Hey could you profile which part of caddy is eating up the resources?
Maybe its faster with nginx because of AES-NI, i dont know if golang has incorporated support for that.


(Casper LI) #28

Since it is written in Go Language:heart_eyes:?


(George) #29

It’s been a while since I tested Caddy for above benchmarks so haven’t profiled as such. Was hoping this discussion would prompt others who know more to look into this as well :slight_smile:

other folks have posted benchmarks too https://ferdinand-muetsch.de/caddy-a-modern-web-server-vs-nginx.html


(Tw) #30

Could you please give some information (e.g. your caddyfile) that we could setup local test environment?


(George) #31

full details at

for part 1 https://community.centminmod.com/threads/caddy-http-2-server-benchmarks.5170/
for part 2 https://community.centminmod.com/threads/caddy-http-2-server-benchmarks.5170/#post-34346


(Mikorist) #32

I use Caddy with HHVM now.

Very loaded site.

20.000 req/s . CPU load 2 and 900MB memory used.

is there a possibility to compile Caddy with LibreSSL 2.4.2 ?


(Matt Holt) #33

Nope, Caddy uses a Grade-A memory safe TLS implementation only. :grin:


(Mikorist) #34

Well, that’s better. My ram is not a problem. There is plenty of room for up to 32GB :sunglasses: