Increase number of threads available on FastAPI.

main.py

import anyio
from fastapi import FastAPI


app = FastAPI()


@app.on_event("startup")
async def startup():
    limiter = anyio.to_thread.current_default_thread_limiter()
    limiter.total_tokens = 100


@app.get("/")
async def home():
    print(anyio.to_thread.current_default_thread_limiter().total_tokens)