WebSocket Concurrent Connection & Server Memory Sizing Calculator
Calculate total server RAM, Linux kernel TCP socket buffers, TLS session overhead, OS file descriptor limits (ulimit), and heartbeat ping/pong bandwidth for high-concurrency WebSocket & SSE servers.
Connection & Architecture Parameters
conns
Kernel TCP window memory per established socket.
OpenSSL/BoringSSL crypto context per connection.
sec
Server Capacity Sizing
MID-SCALE CLUSTER
Total Recommended RAM
1.37 GB
22.5 KB per connection
Required File Descriptors
55,000
Minimum ulimit -n value
Heartbeat Egress Bandwidth
0.44 Mbit/s
Continuous idle ping traffic
Kernel TCP Buffer RAM
800.0 MB
Socket rmem + wmem pool
Memory Allocation Breakdown
Kernel TCP Buffers:
800.0 MB (71.1%)
Application Runtime Heap:
200.0 MB (17.8%)
TLS / Crypto Session State:
125.0 MB (11.1%)
Safety Margin Buffer:
+281.3 MB
Recommended Linux /etc/sysctl.conf Settings
fs.file-max = 65536
net.ipv4.tcp_rmem = 4096 8192 16384
net.ipv4.tcp_wmem = 4096 8192 16384
net.core.somaxconn = 32768
net.ipv4.tcp_rmem = 4096 8192 16384
net.ipv4.tcp_wmem = 4096 8192 16384
net.core.somaxconn = 32768