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Learning English
Benchmarking APE
Configurating debian to support more users.
First of all, you need to increase the maximum number of open file descriptors, you can user ulimit -n command, but if you run APE has root, he'll make it by himself, increasinf it to 65435 (You can change this value in file « ape.conf », value Server.rlimit_nofile).
So we set this value to 1000k (cause we are optimist).
Configurating clients to andle more users.
Tuning server to receive more connections was easy, tuning clients was another story. For our tests we use Tsung (an erlang stress app), with an APE plugin we createds.
The first problem was (like on the server), the maximum number of open file descriptors, we just added ulimit -n 999999 at the end of each client's /root/.bashrc file.
The second problem we had was the number of ports wich seems to limit outgoing connections to 28k. This was easy to increase using echo "1024 65535" > /proc/sys/net/ipv4/ip_local_port_range wich increases the number of available ports to 64511 wich is much better, but steels limited.
The third problem was to have more then 64511 users per computer. Searching on the web I found the solution: « using virtual interface », but the new problem was that, by default, system gives an origin port that isn't used on any interface. So we had to specify the origin port manually wich isn't supported by tsung. So we learned erlang to modify tsung system to specify an origin port.
We created this module (add it on src/tsung/ts_ports.erl):
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