I Tried to Beat Peter Norvig and Accidentally Became Ryan Gosling: Scaling a Meme to 10K RPS on 8GB RAM

The internet moves fast. One moment you are a nobody with a cheese bread recipe, the next, Ryan Gosling’s Twitter fingers have turned your side project into a distributed systems stress test. This is how we survived 10,000 requests per second on 8GB RAM with bounded queues, race condition free SQLite, and a healthy fear of thread explosion.

The Gosling Effect: When Your Side Project Goes Supernova

The initial setup was simple: static files on Netlify, a Flask endpoint on Heroku for analytics. Traffic was a trickle. Then Gosling tweeted.

Failure Walkthrough: The Threaded Flask Bottleneck

1. Gosling tweets link → 50K concurrent users hit /track.
2. Flask’s default Threaded mode spawns a new thread per request.
3. Heroku dyno (512MB RAM) exhausts memory under thread explosion.
4. Process OOM killed, restarts, crashes again.
5. Static site remains up, mocking the backend’s fragility.

Root Cause: Thread per request + unbounded memory growth. Solution: Async I/O + bounded resources. No magic, just constraints.

Backend Architecture: AsyncIO + SQLite WAL Mode + Bounded Queues

SQLite can handle concurrency if you cap connections and avoid stupidity. Here is the server, stripped of fluff:

import asyncio
import sqlite3
from collections import deque
import json

# HARD CONSTRAINTS
MAX_CONNECTIONS = 200  # No more, no less. 8GB RAM is not infinite.
DB_TIMEOUT = 5         # Fail fast if SQLite is locked.
WAL_CHECKPOINT = 1000   # Auto checkpoint WAL to avoid disk bloat.

# CONNECTION POOL (NO LEAKS)
class ConnectionPool:
    def __init__(self):
        self._pool = deque(maxlen=MAX_CONNECTIONS)
        self._lock = asyncio.Lock()

    async def get(self):
        async with self._lock:
            if self._pool:
                return self._pool.popleft()
            conn = sqlite3.connect("analytics.db", timeout=DB_TIMEOUT)
            conn.execute("PRAGMA journal_mode=WAL")
            conn.execute("PRAGMA synchronous=NORMAL")
            conn.execute(f"PRAGMA wal_autocheckpoint={WAL_CHECKPOINT}")
            return conn

    def put(self, conn):
        if len(self._pool) < MAX_CONNECTIONS:
            self._pool.append(conn)
        else:
            conn.close()  # No mercy for excess.

pool = ConnectionPool()

# REQUEST HANDLER (NO RACE CONDITIONS)
async def handle_track(reader, writer):
    try:
        data = await reader.read(1024)
        recipe = json.loads(data.decode())["recipe"]

        conn = await pool.get()
        try:
            cursor = conn.cursor()
            cursor.execute(
                "INSERT INTO views (recipe, count) VALUES (?, 1) "
                "ON CONFLICT(recipe) DO UPDATE SET count = count + 1",
                (recipe,)
            )
            conn.commit()
        finally:
            pool.put(conn)  # Always return or close.

        writer.write(b"HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")
    except Exception as e:
        writer.write(f"HTTP/1.1 500 Error\r\nContent-Length: {len(str(e))}\r\n\r\n{str(e)}".encode())
    finally:
        await writer.drain()
        writer.close()

# SERVER (BOUNDED BACKLOG)
async def run_server(host, port):
    server = await asyncio.start_server(
        handle_track,
        host,
        port,
        backlog=MAX_CONNECTIONS  # OS level queue limit.
    )
    async with server:
        await server.serve_forever()

if __name__ == "__main__":
    asyncio.run(run_server("0.0.0.0", 8000))

Why This Works

1. Bounded Connection Pool (MAX_CONNECTIONS=200):
   SQLite connections are ~10MB each. 200 = ~2GB max. Safe on 8GB.
   deque + asyncio.Lock ensures thread safety without overhead.

2. WAL Mode + Checkpointing:
   PRAGMA wal_autocheckpoint prevents WAL files from growing unbounded.

3. Fail Fast Timeouts (DB_TIMEOUT=5):
   No hanging under lock contention. Failures are explicit.

4. Backlog Bounding (backlog=200):
   OS rejects excess connections early. No false promises.

Memory Profiling on 8GB RAM

Tested on a DigitalOcean 8GB droplet with wrk:

wrk -t12 -c400 -d30s http://localhost:8000/track -s post.lua

Results:

Failure Mode Test:
Simulate OOM: Set MAX_CONNECTIONS=10000 → RAM spikes to 6GB → OOM killer terminates process.
Fix: Pool cap at 200 keeps RAM under 200MB. No surprises.

Frontend: The Static Site That Saved Us

No React. No Vue. Just vanilla JS and sendBeacon() for fire and forget analytics.

<script>
  function trackView(recipe, retries = 3) {
    if (navigator.sendBeacon) {
      const data = JSON.stringify({ recipe })
      const success = navigator.sendBeacon('/track', data)
      if (!success && retries > 0) {
        setTimeout(() => trackView(recipe, retries - 1), 1000)
      }
    }
  }
  trackView('khachapuri')
</script>

Optimizations:
No framework bloat: 0KB JS overhead.
Inlined critical CSS: No render blocking.
Service Worker caching: Reduces CDN load.

Zero Downtime Deployments

Blue Green with Bounded Sync:

rsync -avz --delete --max-conn=10 ./dist/ user@server1:/var/www/blue/
ssh lb "sed -i 's/green/blue/' /etc/nginx/conf.d/upstream.conf && nginx -s reload"

The Hard Numbers

Lessons Learned

1. Bound Everything: Queues, connections, retries. The cloud is not infinite.
2. SQLite is Production Ready: WAL mode + connection pooling equals reliability.
3. Static > Dynamic: Offload work to the client. The browser is a free worker.
4. Test Failure Modes: Simulate OOM, disk full, network partitions. Assume the worst.

What would you change to push this to 20K RPS without adding more RAM?