up1 · July 4, 2026 03:05
diff --git a/2.txt b/2.txt
 # 1. Check in OS limit
 ulimit -n

 # 2. Check on system (ulimit -n cannot exceed)
 cat /proc/sys/fs/file-max

 # 3. check in BEAM
 :erlang.system_info(:port_limit)   # the +Q ceiling
 :erlang.system_info(:port_count)   # current usage
diff --git a/check.sh b/check.sh
 for i in $(seq 1 2000); do
  nc localhost 4001 >/dev/null &
 done
diff --git a/compose.yml b/compose.yml
 services:
  beam-limit-lab:
    build: .
    ports:
      - "4000:4000"
    environment:
      # Good production-style setting
      ERL_AFLAGS: "+Q 65536"
    ulimits:
      nofile:
        soft: 65536
        hard: 65536
diff --git a/error.txt b/error.txt
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
 ACCEPT ERROR: :system_limit
	# 1. Check in OS limit
	ulimit -n

	# 2. Check on system (ulimit -n cannot exceed)
	cat /proc/sys/fs/file-max

	# 3. check in BEAM
	:erlang.system_info(:port_limit) # the +Q ceiling
	:erlang.system_info(:port_count) # current usage
	services:
	beam-limit-lab:
	build: .
	ports:
	- "4000:4000"
	environment:
	# Good production-style setting
	ERL_AFLAGS: "+Q 65536"
	ulimits:
	nofile:
	soft: 65536
	hard: 65536