PostgreSQL I/O 워커 자동 조절

<div class="demo"><div class="head"><b>I/O WORKERS</b><span>min 1 · max 4</span></div><div class="stage workers"><div class="queue"><span>pending I/O</span><div class="queuebar"><i id="queued"></i></div><strong id="qcount">4 waiting</strong></div><div class="workerbox"><span>active workers</span><div class="slots"><i></i><i></i><i></i><i></i></div><strong id="wcount">1 / 4</strong></div></div><div class="foot"><span id="workerstatus">queue rises</span><span>io_method=worker</span></div></div>

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let n=0;function tick(){let count=[1,2,4,2][n];let pending=[4,3,1,2][n];document.querySelectorAll('.workerbox .slots i').forEach((e,i)=>e.classList.toggle('on',i<count));document.getElementById('queued').style.width=(pending*22)+'%';document.getElementById('qcount').textContent=pending+' waiting';document.getElementById('wcount').textContent=count+' / 4';document.getElementById('workerstatus').textContent=['queue rises','add workers','queue drains','scale down'][n];n=(n+1)%4}tick();const t=setInterval(tick,750);document.querySelector('.demo').onclick=()=>{clearInterval(t);tick()}