Reduce backend instance count in resource constrained environments

[alxndrsn]

WORKER_COUNT/pm2 instance count hasn't changed significantly since 4ea0822 (apart from #2169).

As an example, consider a server with 2GB RAM and 2 logical CPU cores.

• will run 4 NodeJS instances
• each NodeJS instance will assume it has 4GB of RAM available:

const v8 = require('node:v8');
const stats = v8.getHeapStatistics();

console.log(`Max Heap Limit: ${(stats.heap_size_limit / 1024 / 1024).toFixed(2)} MB`);
console.log(`Total Physical Available: ${(stats.total_available_size / 1024 / 1024).toFixed(2)} MB`);

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Recommended count

NodeJS

TODO

pm2

TODO

Taking other services into consideration

TODO: keep 1 CPU clear?