Hi Chris, On the same thread, I testified to achieve 100K concurrent connections on one mosquitto broker, installed on one medim sized EC2 instance. All the clients were simultaneously connected, as both $SYS/broker/clients/active and netstat show that number. Rate of message sending was something like 2-3 per second. Note: the connections were not secured (no SSL) I tested SSL and saw that it significantly reduces both the capacity for concurrent connections and performance of message sending. mosquitto version that was tested was 1.0.5.
here are the details of the test machine OS: Ubuntu 12.04 x64. /etc/sysctl.conf fs.file-max = 999999 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 4096 16777216 net.ipv4.tcp_wmem = 4096 4096 16777216 net.ipv4.tcp_syncookies = 1 # this gives the kernel more memory for tcp # which you need with many (100k+) open socket connections net.ipv4.tcp_mem = 50576 64768 98152 net.core.netdev_max_backlog = 2500 /etc/security/limits.conf * soft nofile 262144 * hard nofile 262144 * soft nproc 262144 * hard nproc 262144 /proc/sys/net/ipv4/ip_local_port_range 32768 61000 /proc/sys/kernel/threads-max 26488 .bashrc ulimit -t unlimited ulimit -c unlimited ulimit -a core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 13244 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 13244 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited hope this helps. Sharon From: mosquitto-users-bounces+sharon.ben-asher=avg....@lists.launchpad.net [mailto:mosquitto-users-bounces+sharon.ben-asher=avg....@lists.launchpad.net] On Behalf Of Chris Herssens Sent: Friday, January 18, 2013 2:22 PM To: mosquitto-users@lists.launchpad.net Subject: [Mosquitto-users] maximum of simultaneous connections on a mosquitto broker Hello all, In the thread https://lists.launchpad.net/mosquitto-users/msg00107.html is it mentioned that is should be poosilbe to connect 200k devices on the broker. I find this very high since the broker is single threaded and use the poll() api which is of order O(n). Is it possible to tell me how you did this test ? How do you have to configure the EC2 instance so that we can handle 200K connections? Are all the clients simultaneous connected to the broker and what is the rate of the messages ? How many subscriptions to you have? Regards, Chris
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