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feat: adding kvbm-engine (#6773)  
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<!-- SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved. -->
<!-- SPDX-License-Identifier: Apache-2.0 -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>KVBM Bench Engine Results Viewer</title>
<style>
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f9f9f7;--card:#fff;--border:#e0e0e0;--text:#1a1a1a;--text2:#555;
  --green:#76B900;--green-dark:#4A7A00;--blue:#0074DF;--blue-dark:#1565C0;
  --orange:#EF9100;--orange-dark:#C67800;--red:#E52020;--red-dark:#C62828;
  --nav:#1a1a1a;--radius:16px;--font:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --mono:'SF Mono','Cascadia Code',Consolas,monospace;
}
html{scroll-behavior:smooth;scroll-padding-top:56px}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.5}

/* Nav */
nav{position:sticky;top:0;z-index:100;background:var(--nav);display:flex;align-items:center;gap:4px;padding:0 16px;height:48px;overflow-x:auto;white-space:nowrap}
nav a{color:#ccc;text-decoration:none;font-size:13px;padding:6px 10px;border-radius:6px;transition:color .15s,background .15s}
nav a:hover{color:#fff;background:rgba(255,255,255,.08)}
nav a.active{color:#fff;background:rgba(118,185,0,.25);border-bottom:2px solid var(--green)}
nav .spacer{flex:1}
nav select{background:#333;color:#fff;border:1px solid #555;border-radius:6px;padding:4px 8px;font-size:13px;font-family:var(--font)}
nav .brand{color:#fff;font-weight:700;font-size:14px;margin-right:12px;letter-spacing:.3px}

/* Header / data loading */
.header{max-width:1200px;margin:0 auto;padding:24px 20px}
.header h1{font-size:22px;font-weight:700;margin-bottom:4px}
.header p{color:var(--text2);font-size:14px;margin-bottom:16px}
.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:40px 20px;text-align:center;transition:border-color .2s,background .2s;cursor:pointer}
.drop-zone.over{border-color:var(--green);background:rgba(118,185,0,.06)}
.drop-zone h3{font-size:16px;margin-bottom:8px}
.drop-zone p{color:var(--text2);font-size:13px}
.load-row{display:flex;gap:12px;margin-top:12px;align-items:center;flex-wrap:wrap}
.load-row input[type=file]{font-size:13px}
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.kpi{border-left:3px solid var(--green);padding:14px 16px}
.kpi.blue{border-left-color:var(--blue)}.kpi.amber{border-left-color:var(--orange)}
.kpi .label{font-size:12px;color:var(--text2);text-transform:uppercase;letter-spacing:.5px}
.kpi .value{font-size:26px;font-weight:700;margin:2px 0}
.kpi .sub{font-size:12px;color:var(--text2)}

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/* Footer */
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/* Responsive */
@media(max-width:600px){
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}
</style>
</head>
<body>

<nav id="nav">
  <span class="brand">KVBM Bench</span>
  <a href="#summary" data-sec="summary">Summary</a>
  <a href="#concurrency" data-sec="concurrency">Concurrency</a>
  <a href="#pagesize" data-sec="pagesize">Page Size</a>
  <a href="#bounce" data-sec="bounce">Bounce</a>
  <a href="#g2g3" data-sec="g2g3">G2/G3</a>
  <a href="#gds" data-sec="gds">GDS vs Staged</a>
  <a href="#bidir" data-sec="bidir">Bidirectional</a>
  <a href="#latency" data-sec="latency">Latency</a>
  <a href="#rawdata" data-sec="rawdata">Data</a>
  <span class="spacer"></span>
  <select id="gpuFilter"><option value="all">All GPUs</option></select>
</nav>

<div class="header" id="headerZone">
  <h1>KVBM Benchmark Results Viewer</h1>
  <p>Load bench_engine JSON Lines output to visualize performance characteristics</p>
  <div class="drop-zone" id="dropZone">
    <h3>Drop .jsonl file here</h3>
    <p>or use the controls below</p>
  </div>
  <div class="load-row">
    <input type="file" id="filePicker" accept=".jsonl,.json,.txt">
    <textarea id="pasteArea" placeholder="Paste JSON Lines here..."></textarea>
    <button class="btn btn-green" id="pasteBtn">Load</button>
  </div>
  <div class="loaded-bar" id="loadedBar" style="display:none">
    <span class="fname" id="loadedName">file.jsonl</span>
    <span class="count" id="loadedCount">0 records</span>
    <span class="spacer" style="flex:1"></span>
    <button class="btn btn-sm btn-green" id="reloadBtn">Load Different</button>
  </div>
</div>

<main id="main">
  <section id="summary"><h2>Summary</h2><p class="desc">Key performance indicators across all tests</p><div class="kpi-grid" id="kpiGrid"></div></section>
  <section id="concurrency"><h2>Concurrency Scaling</h2><p class="desc">Bandwidth vs concurrency &mdash; find the saturation point for each transfer type</p><div class="pills" id="concPills"></div><div class="chart-grid" id="concCharts"></div></section>
  <section id="pagesize"><h2>Page Size Efficiency</h2><p class="desc">Bandwidth vs page_size &mdash; block size amortization</p><div class="pills" id="psPills"></div><div class="chart-wrap" id="psChart"></div></section>
  <section id="bounce"><h2>Bounce Buffer Analysis</h2><p class="desc">Bandwidth vs bounce_blocks &mdash; double-buffering effectiveness</p><div class="chart-wrap" id="bounceChart"></div></section>
  <section id="g2g3"><h2>G2/G3 Raw Bandwidth</h2><p class="desc">NVMe read vs write bandwidth at each concurrency level</p><div class="chart-wrap" id="g2g3Chart"></div></section>
  <section id="gds"><h2>GDS vs Staged</h2><p class="desc">GPUDirect Storage bypass compared to best staged transfer</p><div class="chart-wrap" id="gdsChart"></div></section>
  <section id="bidir"><h2>Bidirectional Contention</h2><p class="desc">Isolated vs contended bandwidth to measure contention degradation</p><div class="chart-wrap" id="bidirChart"></div></section>
  <section id="latency"><h2>Latency Distribution</h2><p class="desc">Horizontal box plots showing min / p50 / p95 / p99 / max per test</p><div class="chart-wrap" id="latChart"></div></section>
  <section id="rawdata"><h2>Raw Data</h2><p class="desc">All loaded records &mdash; click column headers to sort</p><div class="card"><div class="table-wrap" id="tableWrap"></div></div></section>
</main>

<div id="tooltip"></div>
<footer>KVBM Bench Viewer &mdash; NVIDIA CORPORATION &amp; AFFILIATES</footer>

<script>
"use strict";

/* ── Color map ── */
const COLOR={
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  g1_to_g3_staged:"#EF9100",g3_to_g1_staged:"#C67800",
  g1_to_g3_gds:"#E52020",g3_to_g1_gds:"#C62828",
  bidir_g1_to_g2:"#76B900",bidir_g2_to_g1:"#4A7A00"
};
const DASHED=new Set(["bidir_g1_to_g2","bidir_g2_to_g1"]);
function testColor(t){return COLOR[t]||"#888"}

/* ── State ── */
let DATA=[];
let FILTERED=[];
let sortCol=null,sortAsc=true;

/* ── DOM helpers ── */
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/* ── SVG mini-lib ── */
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  fn.domain=domain;fn.range=range;
  fn.ticks=function(n=6){
    if(d0===d1)return[d0];
    const step=niceStep((d1-d0)/n);
    const start=Math.ceil(d0/step)*step;
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}
function niceStep(raw){
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  if(label){
    const lbl=svgEl("text",{x:0,y:0,"text-anchor":"middle",fill:"#999","font-size":"11",style:"font-family:var(--font)",transform:`translate(${x-44},${(scale.range[0]+scale.range[1])/2}) rotate(-90)`});
    lbl.textContent=label;g.appendChild(lbl);
  }
  svg.appendChild(g);
}
function drawGridY(svg,scaleY,x0,x1){
  const ticks=scaleY.ticks(6);
  ticks.forEach(t=>{
    const y=scaleY(t);
    svg.appendChild(svgEl("line",{x1:x0,x2:x1,y1:y,y2:y,stroke:"#f0f0f0","stroke-width":1}));
  });
}

function drawLine(svg,points,color,dashed){
  if(points.length===0)return;
  const d=points.map((p,i)=>(i===0?"M":"L")+p[0]+","+p[1]).join(" ");
  const attrs={d,fill:"none",stroke:color,"stroke-width":2,"stroke-linejoin":"round","stroke-linecap":"round"};
  if(dashed)attrs["stroke-dasharray"]="6,4";
  svg.appendChild(svgEl("path",attrs));
  points.forEach(p=>{
    const c=svgEl("circle",{cx:p[0],cy:p[1],r:4,fill:color,stroke:"#fff","stroke-width":1.5,style:"cursor:pointer"});
    c._tip=p[2];
    c.addEventListener("mouseenter",e=>showTip(e,p[2]));
    c.addEventListener("mouseleave",hideTip);
    svg.appendChild(c);
  });
}

/* Tooltip */
const tooltip=document.getElementById("tooltip");
function showTip(e,html){
  tooltip.innerHTML=html;tooltip.style.display="block";
  positionTip(e);
}
function positionTip(e){
  const tw=tooltip.offsetWidth,th=tooltip.offsetHeight;
  let x=e.clientX+12,y=e.clientY-th-8;
  if(x+tw>window.innerWidth)x=e.clientX-tw-12;
  if(y<0)y=e.clientY+16;
  tooltip.style.left=x+"px";tooltip.style.top=y+"px";
}
function hideTip(){tooltip.style.display="none"}
document.addEventListener("mousemove",e=>{if(tooltip.style.display==="block")positionTip(e)});

function fmtNum(v){
  if(v>=1000)return v.toLocaleString(undefined,{maximumFractionDigits:1});
  if(v===0)return"0";
  if(Math.abs(v)<0.01)return v.toExponential(1);
  return +v.toFixed(2)+"";
}
function fmtBW(v){return v.toFixed(2)+" GB/s"}
function fmtUs(v){return v.toFixed(1)+" us"}
function fmtLabel(t){return t.replace(/_/g," ")}

/* ── Data loading ── */
function parseJSONL(text){
  const lines=text.trim().split("\n");
  const out=[];
  for(const line of lines){
    const s=line.trim();
    if(!s)continue;
    try{out.push(JSON.parse(s))}catch(e){/* skip */}
  }
  return out;
}

function loadData(records,name){
  DATA=records;
  populateGPUFilter();
  applyFilter();
  $("#main").style.display="block";
  /* collapse loader */
  $("#dropZone").style.display="none";
  $(".load-row").style.display="none";
  $("#loadedBar").style.display="flex";
  $("#loadedName").textContent=name||"pasted data";
  $("#loadedCount").textContent=records.length+" records";
}

/* Drop zone */
const dz=$("#dropZone");
dz.addEventListener("dragover",e=>{e.preventDefault();dz.classList.add("over")});
dz.addEventListener("dragleave",()=>dz.classList.remove("over"));
dz.addEventListener("drop",e=>{
  e.preventDefault();dz.classList.remove("over");
  const f=e.dataTransfer.files[0];
  if(f)readFile(f);
});
dz.addEventListener("click",()=>$("#filePicker").click());

$("#filePicker").addEventListener("change",e=>{
  const f=e.target.files[0];
  if(f)readFile(f);
});
function readFile(f){
  const r=new FileReader();
  r.onload=()=>loadData(parseJSONL(r.result),f.name);
  r.readAsText(f);
}
$("#pasteBtn").addEventListener("click",()=>{
  const txt=$("#pasteArea").value;
  if(txt.trim())loadData(parseJSONL(txt),"pasted");
});
$("#reloadBtn").addEventListener("click",()=>{
  $("#dropZone").style.display="";$(".load-row").style.display="";
  $("#loadedBar").style.display="none";
});

/* GPU filter */
function populateGPUFilter(){
  const sel=$("#gpuFilter");
  sel.innerHTML='<option value="all">All GPUs</option>';
  const ids=[...new Set(DATA.map(d=>d.device_id))].sort((a,b)=>a-b);
  ids.forEach(id=>{
    const o=document.createElement("option");o.value=id;o.textContent="GPU "+id;
    sel.appendChild(o);
  });
}
$("#gpuFilter").addEventListener("change",()=>applyFilter());

function applyFilter(){
  const sel=$("#gpuFilter").value;
  FILTERED=sel==="all"?DATA.slice():DATA.filter(d=>String(d.device_id)===sel);
  renderAll();
}

/* ── Render orchestrator ── */
function renderAll(){
  renderKPIs();
  renderConcurrency();
  renderPageSize();
  renderBounce();
  renderG2G3();
  renderGDS();
  renderBidir();
  renderLatency();
  renderTable();
  hideEmptySections();
}

/* ── Helpers ── */
function unique(arr,key){return[...new Set(arr.map(d=>d[key]))].sort((a,b)=>a-b)}
function groupBy(arr,key){
  const m={};
  arr.forEach(d=>{const k=d[key];(m[k]=m[k]||[]).push(d)});
  return m;
}

/* ── Section: KPIs ── */
function renderKPIs(){
  const g=$("#kpiGrid");g.innerHTML="";
  if(!FILTERED.length)return;
  const maxBW=Math.max(...FILTERED.map(d=>d.bandwidth_gbs||0));
  const maxAgg=Math.max(...FILTERED.map(d=>d.aggregate_bandwidth_gbs||0));
  const tests=[...new Set(FILTERED.map(d=>d.test))];
  const devices=[...new Set(FILTERED.map(d=>d.device_id))];
  const avgLat=FILTERED.reduce((s,d)=>s+(d.latency_us?.mean_us||0),0)/FILTERED.length;

  const kpis=[
    {label:"Peak Single-Stream BW",value:fmtBW(maxBW),sub:FILTERED.find(d=>d.bandwidth_gbs===maxBW)?.test,cls:""},
    {label:"Peak Aggregate BW",value:fmtBW(maxAgg),sub:"across all streams",cls:""},
    {label:"Tests",value:tests.length,sub:tests.slice(0,3).join(", ")+(tests.length>3?" ...":""),cls:"blue"},
    {label:"GPUs",value:devices.length,sub:"device IDs: "+devices.join(", "),cls:"blue"},
    {label:"Total Records",value:FILTERED.length,sub:"loaded",cls:"amber"},
    {label:"Avg Latency",value:fmtUs(avgLat),sub:"mean across all tests",cls:"amber"},
  ];
  kpis.forEach(k=>{
    const d=el("div",{class:"card kpi"+(k.cls?" "+k.cls:"")});
    d.appendChild(el("div",{class:"label"},k.label));
    d.appendChild(el("div",{class:"value"},String(k.value)));
    d.appendChild(el("div",{class:"sub"},k.sub||""));
    g.appendChild(d);
  });
}

/* ── Section: Concurrency Scaling ── */
let concPageFilter=null;
function renderConcurrency(){
  const wrap=$("#concCharts");wrap.innerHTML="";
  const pillsEl=$("#concPills");pillsEl.innerHTML="";
  const pages=unique(FILTERED,"page_size");
  if(pages.length>1){
    pages.forEach(ps=>{
      const p=el("button",{class:"pill"+(concPageFilter===ps?" active":""),onclick:()=>{concPageFilter=concPageFilter===ps?null:ps;renderConcurrency()}},String(ps));
      pillsEl.appendChild(p);
    });
  }
  let data=FILTERED;
  if(concPageFilter!==null)data=data.filter(d=>d.page_size===concPageFilter);

  const byTest=groupBy(data,"test");
  const tests=Object.keys(byTest);
  if(!tests.length)return;

  const W=540,H=300;
  const svg=createSVG(W,H);
  const xVals=unique(data,"concurrency");
  const allBW=data.map(d=>d.aggregate_bandwidth_gbs||d.bandwidth_gbs||0);
  const xS=scaleLinear([Math.min(...xVals),Math.max(...xVals)],[M.left,W-M.right]);
  const yS=scaleLinear([0,Math.max(...allBW)*1.1],[H-M.bottom,M.top]);

  drawGridY(svg,yS,M.left,W-M.right);
  drawXAxis(svg,xS,H-M.bottom,"Concurrency");
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  tests.forEach(t=>{
    const pts=byTest[t].slice().sort((a,b)=>a.concurrency-b.concurrency);
    const mapped=pts.map(d=>[xS(d.concurrency),yS(d.aggregate_bandwidth_gbs||d.bandwidth_gbs),
      `<b>${fmtLabel(t)}</b><br>conc: ${d.concurrency}<br>BW: ${fmtBW(d.aggregate_bandwidth_gbs||d.bandwidth_gbs)}<br>page: ${d.page_size}`]);
    drawLine(svg,mapped,testColor(t),DASHED.has(t));
  });

  const card=el("div",{class:"card"});
  card.appendChild(svg);
  card.appendChild(makeLegend(tests));
  wrap.appendChild(card);
}

function makeLegend(tests){
  const lg=el("div",{class:"legend"});
  tests.forEach(t=>{
    const item=el("div",{class:"legend-item"});
    const sw=el("span",{class:"legend-swatch",style:{background:testColor(t),width:"14px",height:DASHED.has(t)?"2px":"4px",borderTop:DASHED.has(t)?`2px dashed ${testColor(t)}`:"none",background:DASHED.has(t)?"transparent":testColor(t)}});
    item.appendChild(sw);
    item.appendChild(el("span",{},fmtLabel(t)));
    lg.appendChild(item);
  });
  return lg;
}

/* ── Section: Page Size ── */
let psConcFilter=null;
function renderPageSize(){
  const wrap=$("#psChart");wrap.innerHTML="";
  const pillsEl=$("#psPills");pillsEl.innerHTML="";
  const concs=unique(FILTERED,"concurrency");
  if(concs.length>1){
    concs.forEach(c=>{
      const p=el("button",{class:"pill"+(psConcFilter===c?" active":""),onclick:()=>{psConcFilter=psConcFilter===c?null:c;renderPageSize()}},String(c));
      pillsEl.appendChild(p);
    });
  }
  let data=FILTERED;
  if(psConcFilter!==null)data=data.filter(d=>d.concurrency===psConcFilter);

  const byTest=groupBy(data,"test");
  const tests=Object.keys(byTest);
  const pages=unique(data,"page_size");
  if(!tests.length||!pages.length)return;

  const barW=20,groupGap=24,innerGap=2;
  const groupWidth=tests.length*barW+(tests.length-1)*innerGap;
  const W=M.left+M.right+pages.length*(groupWidth+groupGap);
  const H=320;
  const svg=createSVG(Math.max(W,400),H);

  const allBW=data.map(d=>d.bandwidth_gbs||0);
  const yS=scaleLinear([0,Math.max(...allBW)*1.15],[H-M.bottom,M.top]);
  drawGridY(svg,yS,M.left,Math.max(W,400)-M.right);
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  pages.forEach((ps,pi)=>{
    const gx=M.left+pi*(groupWidth+groupGap)+groupGap/2;
    /* x-label */
    const lbl=svgEl("text",{x:gx+groupWidth/2,y:H-M.bottom+18,"text-anchor":"middle",fill:"#777","font-size":"11",style:"font-family:var(--font)"});
    lbl.textContent=ps;svg.appendChild(lbl);

    tests.forEach((t,ti)=>{
      const rec=byTest[t]?.find(d=>d.page_size===ps);
      if(!rec)return;
      const bw=rec.bandwidth_gbs||0;
      const bx=gx+ti*(barW+innerGap);
      const by=yS(bw);
      const bh=yS(0)-by;
      const rect=svgEl("rect",{x:bx,y:by,width:barW,height:Math.max(bh,1),rx:3,fill:testColor(t),style:"cursor:pointer"});
      rect.addEventListener("mouseenter",e=>showTip(e,`<b>${fmtLabel(t)}</b><br>page_size: ${ps}<br>BW: ${fmtBW(bw)}`));
      rect.addEventListener("mouseleave",hideTip);
      svg.appendChild(rect);
    });
  });
  /* x-axis label */
  const xLbl=svgEl("text",{x:(M.left+Math.max(W,400)-M.right)/2,y:H-4,"text-anchor":"middle",fill:"#999","font-size":"11",style:"font-family:var(--font)"});
  xLbl.textContent="page_size";svg.appendChild(xLbl);

  const card=el("div",{class:"card"});
  card.appendChild(svg);card.appendChild(makeLegend(tests));
  wrap.appendChild(card);
}

/* ── Section: Bounce Buffer ── */
function renderBounce(){
  const wrap=$("#bounceChart");wrap.innerHTML="";
  const data=FILTERED.filter(d=>d.bounce_blocks!=null);
  if(!data.length){return}

  const byTest=groupBy(data,"test");
  const tests=Object.keys(byTest);
  const W=540,H=300;
  const svg=createSVG(W,H);

  const xVals=unique(data,"bounce_blocks");
  const allBW=data.map(d=>d.bandwidth_gbs||0);
  const xS=scaleLinear([Math.min(...xVals),Math.max(...xVals)],[M.left,W-M.right]);
  const yS=scaleLinear([0,Math.max(...allBW)*1.1],[H-M.bottom,M.top]);

  drawGridY(svg,yS,M.left,W-M.right);
  drawXAxis(svg,xS,H-M.bottom,"bounce_blocks");
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  tests.forEach(t=>{
    const pts=byTest[t].slice().sort((a,b)=>a.bounce_blocks-b.bounce_blocks);
    const mapped=pts.map(d=>[xS(d.bounce_blocks),yS(d.bandwidth_gbs),
      `<b>${fmtLabel(t)}</b><br>bounce: ${d.bounce_blocks}<br>BW: ${fmtBW(d.bandwidth_gbs)}`]);
    drawLine(svg,mapped,testColor(t),DASHED.has(t));
  });

  const card=el("div",{class:"card"});
  card.appendChild(svg);card.appendChild(makeLegend(tests));
  wrap.appendChild(card);
}

/* ── Section: G2/G3 ── */
function renderG2G3(){
  const wrap=$("#g2g3Chart");wrap.innerHTML="";
  const tests=["g2_to_g3","g3_to_g2"];
  const data=FILTERED.filter(d=>tests.includes(d.test));
  if(!data.length)return;

  const concs=unique(data,"concurrency");
  const byTest=groupBy(data,"test");
  const barW=24,innerGap=4,groupGap=30;
  const groupWidth=tests.length*barW+(tests.length-1)*innerGap;
  const W=M.left+M.right+concs.length*(groupWidth+groupGap);
  const H=320;
  const svg=createSVG(Math.max(W,400),H);

  const allBW=data.map(d=>d.bandwidth_gbs||0);
  const yS=scaleLinear([0,Math.max(...allBW)*1.15],[H-M.bottom,M.top]);
  drawGridY(svg,yS,M.left,Math.max(W,400)-M.right);
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  concs.forEach((c,ci)=>{
    const gx=M.left+ci*(groupWidth+groupGap)+groupGap/2;
    const lbl=svgEl("text",{x:gx+groupWidth/2,y:H-M.bottom+18,"text-anchor":"middle",fill:"#777","font-size":"11",style:"font-family:var(--font)"});
    lbl.textContent=c;svg.appendChild(lbl);

    tests.forEach((t,ti)=>{
      const rec=(byTest[t]||[]).find(d=>d.concurrency===c);
      if(!rec)return;
      const bw=rec.bandwidth_gbs||0;
      const bx=gx+ti*(barW+innerGap);
      const by=yS(bw);
      const rect=svgEl("rect",{x:bx,y:by,width:barW,height:Math.max(yS(0)-by,1),rx:3,fill:testColor(t),style:"cursor:pointer"});
      rect.addEventListener("mouseenter",e=>showTip(e,`<b>${fmtLabel(t)}</b><br>conc: ${c}<br>BW: ${fmtBW(bw)}`));
      rect.addEventListener("mouseleave",hideTip);
      svg.appendChild(rect);
    });
  });
  const xLbl=svgEl("text",{x:(M.left+Math.max(W,400)-M.right)/2,y:H-4,"text-anchor":"middle",fill:"#999","font-size":"11",style:"font-family:var(--font)"});
  xLbl.textContent="Concurrency";svg.appendChild(xLbl);

  const card=el("div",{class:"card"});
  card.appendChild(svg);card.appendChild(makeLegend(tests));
  wrap.appendChild(card);
}

/* ── Section: GDS vs Staged ── */
function renderGDS(){
  const wrap=$("#gdsChart");wrap.innerHTML="";
  const gdsTests=["g1_to_g3_gds","g3_to_g1_gds"];
  const stagedTests=["g1_to_g3_staged","g3_to_g1_staged"];
  const allTests=[...gdsTests,...stagedTests];
  const data=FILTERED.filter(d=>allTests.includes(d.test));
  if(!data.filter(d=>gdsTests.includes(d.test)).length)return;

  const concs=unique(data,"concurrency");
  const byTest=groupBy(data,"test");
  const present=allTests.filter(t=>byTest[t]?.length);
  const barW=22,innerGap=3,groupGap=28;
  const groupWidth=present.length*barW+(present.length-1)*innerGap;
  const W=M.left+M.right+concs.length*(groupWidth+groupGap);
  const H=320;
  const svg=createSVG(Math.max(W,400),H);

  const allBW=data.map(d=>d.bandwidth_gbs||0);
  const yS=scaleLinear([0,Math.max(...allBW)*1.15],[H-M.bottom,M.top]);
  drawGridY(svg,yS,M.left,Math.max(W,400)-M.right);
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  concs.forEach((c,ci)=>{
    const gx=M.left+ci*(groupWidth+groupGap)+groupGap/2;
    const lbl=svgEl("text",{x:gx+groupWidth/2,y:H-M.bottom+18,"text-anchor":"middle",fill:"#777","font-size":"11",style:"font-family:var(--font)"});
    lbl.textContent=c;svg.appendChild(lbl);

    present.forEach((t,ti)=>{
      const rec=(byTest[t]||[]).find(d=>d.concurrency===c);
      if(!rec)return;
      const bw=rec.bandwidth_gbs||0;
      const bx=gx+ti*(barW+innerGap);
      const by=yS(bw);
      const rect=svgEl("rect",{x:bx,y:by,width:barW,height:Math.max(yS(0)-by,1),rx:3,fill:testColor(t),style:"cursor:pointer"});
      rect.addEventListener("mouseenter",e=>showTip(e,`<b>${fmtLabel(t)}</b><br>conc: ${c}<br>BW: ${fmtBW(bw)}`));
      rect.addEventListener("mouseleave",hideTip);
      svg.appendChild(rect);
    });
  });
  const xLbl=svgEl("text",{x:(M.left+Math.max(W,400)-M.right)/2,y:H-4,"text-anchor":"middle",fill:"#999","font-size":"11",style:"font-family:var(--font)"});
  xLbl.textContent="Concurrency";svg.appendChild(xLbl);

  const card=el("div",{class:"card"});
  card.appendChild(svg);card.appendChild(makeLegend(present));
  wrap.appendChild(card);
}

/* ── Section: Bidirectional ── */
function renderBidir(){
  const wrap=$("#bidirChart");wrap.innerHTML="";
  const bidirTests=["bidir_g1_to_g2","bidir_g2_to_g1"];
  const isoTests=["g1_to_g2","g2_to_g1"];
  const data=FILTERED.filter(d=>[...bidirTests,...isoTests].includes(d.test));
  if(!data.filter(d=>bidirTests.includes(d.test)).length)return;

  const concs=unique(data,"concurrency");
  const byTest=groupBy(data,"test");
  const present=[...isoTests,...bidirTests].filter(t=>byTest[t]?.length);
  const barW=22,innerGap=3,groupGap=28;
  const groupWidth=present.length*barW+(present.length-1)*innerGap;
  const W=M.left+M.right+concs.length*(groupWidth+groupGap);
  const H=320;
  const svg=createSVG(Math.max(W,400),H);

  const allBW=data.map(d=>d.bandwidth_gbs||0);
  const yS=scaleLinear([0,Math.max(...allBW)*1.15],[H-M.bottom,M.top]);
  drawGridY(svg,yS,M.left,Math.max(W,400)-M.right);
  drawYAxis(svg,yS,M.left,"BW (GB/s)");

  concs.forEach((c,ci)=>{
    const gx=M.left+ci*(groupWidth+groupGap)+groupGap/2;
    const lbl=svgEl("text",{x:gx+groupWidth/2,y:H-M.bottom+18,"text-anchor":"middle",fill:"#777","font-size":"11",style:"font-family:var(--font)"});
    lbl.textContent=c;svg.appendChild(lbl);

    present.forEach((t,ti)=>{
      const rec=(byTest[t]||[]).find(d=>d.concurrency===c);
      if(!rec)return;
      const bw=rec.bandwidth_gbs||0;
      const bx=gx+ti*(barW+innerGap);
      const by=yS(bw);
      const hatch=DASHED.has(t);
      const rect=svgEl("rect",{x:bx,y:by,width:barW,height:Math.max(yS(0)-by,1),rx:3,fill:testColor(t),opacity:hatch?"0.6":"1",style:"cursor:pointer"});
      if(hatch){
        rect.setAttribute("stroke",testColor(t));
        rect.setAttribute("stroke-width","2");
        rect.setAttribute("stroke-dasharray","4,3");
      }
      rect.addEventListener("mouseenter",e=>showTip(e,`<b>${fmtLabel(t)}</b><br>conc: ${c}<br>BW: ${fmtBW(bw)}`));
      rect.addEventListener("mouseleave",hideTip);
      svg.appendChild(rect);
    });
  });
  const xLbl=svgEl("text",{x:(M.left+Math.max(W,400)-M.right)/2,y:H-4,"text-anchor":"middle",fill:"#999","font-size":"11",style:"font-family:var(--font)"});
  xLbl.textContent="Concurrency";svg.appendChild(xLbl);

  const card=el("div",{class:"card"});
  card.appendChild(svg);card.appendChild(makeLegend(present));
  wrap.appendChild(card);
}

/* ── Section: Latency Distribution ── */
function renderLatency(){
  const wrap=$("#latChart");wrap.innerHTML="";
  const data=FILTERED.filter(d=>d.latency_us);
  if(!data.length)return;

  /* Aggregate per test: take the record with max mean_us per test for interesting spread,
     or just show all unique test entries. We'll pick one representative per (test, concurrency, page_size). */
  const byTest=groupBy(data,"test");
  const tests=Object.keys(byTest);
  const rowH=36,padY=8;
  const W=700,H=M.top+tests.length*(rowH+padY)+M.bottom;
  const svg=createSVG(W,H);

  /* Find global latency range */
  let gMin=Infinity,gMax=0;
  tests.forEach(t=>{
    byTest[t].forEach(d=>{
      const l=d.latency_us;
      if(l.min_us<gMin)gMin=l.min_us;
      if(l.max_us>gMax)gMax=l.max_us;
    });
  });
  const xS=scaleLinear([0,gMax*1.05],[M.left+100,W-M.right]);

  /* x-axis */
  drawXAxis(svg,xS,H-M.bottom,"Latency (us)");

  tests.forEach((t,i)=>{
    /* Use the record closest to median concurrency */
    const recs=byTest[t].slice().sort((a,b)=>(a.latency_us.mean_us)-(b.latency_us.mean_us));
    const mid=recs[Math.floor(recs.length/2)];
    const l=mid.latency_us;
    const cy=M.top+i*(rowH+padY)+rowH/2;
    const color=testColor(t);

    /* label */
    const lbl=svgEl("text",{x:M.left+94,y:cy+4,"text-anchor":"end",fill:color,"font-size":"12","font-weight":"600",style:"font-family:var(--font)"});
    lbl.textContent=fmtLabel(t);svg.appendChild(lbl);

    /* whisker: min to max */
    svg.appendChild(svgEl("line",{x1:xS(l.min_us),x2:xS(l.max_us),y1:cy,y2:cy,stroke:color,"stroke-width":1}));
    /* caps */
    svg.appendChild(svgEl("line",{x1:xS(l.min_us),x2:xS(l.min_us),y1:cy-8,y2:cy+8,stroke:color,"stroke-width":1.5}));
    svg.appendChild(svgEl("line",{x1:xS(l.max_us),x2:xS(l.max_us),y1:cy-8,y2:cy+8,stroke:color,"stroke-width":1.5}));

    /* box: p50 to p95 */
    const bx=xS(l.p50_us),bx2=xS(l.p95_us);
    const boxRect=svgEl("rect",{x:bx,y:cy-10,width:Math.max(bx2-bx,2),height:20,rx:4,fill:color,opacity:"0.25",stroke:color,"stroke-width":1.5});
    svg.appendChild(boxRect);

    /* p99 mark */
    const p99x=xS(l.p99_us);
    svg.appendChild(svgEl("line",{x1:p99x,x2:p99x,y1:cy-10,y2:cy+10,stroke:color,"stroke-width":2,"stroke-dasharray":"3,2"}));

    /* median line */
    const medX=xS(l.p50_us);
    svg.appendChild(svgEl("line",{x1:medX,x2:medX,y1:cy-10,y2:cy+10,stroke:color,"stroke-width":2.5}));

    /* hover target */
    const hover=svgEl("rect",{x:xS(l.min_us)-2,y:cy-12,width:xS(l.max_us)-xS(l.min_us)+4,height:24,fill:"transparent",style:"cursor:pointer"});
    hover.addEventListener("mouseenter",e=>showTip(e,
      `<b>${fmtLabel(t)}</b> (conc=${mid.concurrency}, page=${mid.page_size})<br>`+
      `min: ${fmtUs(l.min_us)}<br>p50: ${fmtUs(l.p50_us)}<br>p95: ${fmtUs(l.p95_us)}<br>p99: ${fmtUs(l.p99_us)}<br>max: ${fmtUs(l.max_us)}`));
    hover.addEventListener("mouseleave",hideTip);
    svg.appendChild(hover);
  });

  /* Legend for box plot parts */
  const card=el("div",{class:"card"});
  card.appendChild(svg);
  const lgDiv=el("div",{class:"legend",style:{marginTop:"6px",fontSize:"11px",color:"#999"}});
  lgDiv.innerHTML="<span>Whiskers: min/max</span> &middot; <span>Box: p50&ndash;p95</span> &middot; <span>Dashed: p99</span> &middot; <span>Bold line: p50</span>";
  card.appendChild(lgDiv);
  wrap.appendChild(card);
}

/* ── Section: Raw Data Table ── */
const TABLE_COLS=[
  {key:"test",label:"Test",fmt:v=>v},
  {key:"device_id",label:"GPU",fmt:v=>v},
  {key:"page_size",label:"Page Size",fmt:v=>v},
  {key:"blocks_per_batch",label:"Blocks/Batch",fmt:v=>v},
  {key:"concurrency",label:"Conc",fmt:v=>v},
  {key:"bounce_blocks",label:"Bounce",fmt:v=>v==null?"-":v},
  {key:"bandwidth_gbs",label:"BW (GB/s)",fmt:v=>v?.toFixed(2)??""},
  {key:"aggregate_bandwidth_gbs",label:"Agg BW",fmt:v=>v?.toFixed(2)??""},
  {key:"_lat_mean",label:"Lat mean",fmt:v=>v?.toFixed(1)??""},
  {key:"_lat_p50",label:"Lat p50",fmt:v=>v?.toFixed(1)??""},
  {key:"_lat_p99",label:"Lat p99",fmt:v=>v?.toFixed(1)??""},
  {key:"iterations",label:"Iters",fmt:v=>v},
];
function getVal(d,key){
  if(key==="_lat_mean")return d.latency_us?.mean_us;
  if(key==="_lat_p50")return d.latency_us?.p50_us;
  if(key==="_lat_p99")return d.latency_us?.p99_us;
  return d[key];
}
function renderTable(){
  const wrap=$("#tableWrap");wrap.innerHTML="";
  if(!FILTERED.length)return;

  let rows=FILTERED.slice();
  if(sortCol!==null){
    rows.sort((a,b)=>{
      let va=getVal(a,sortCol),vb=getVal(b,sortCol);
      if(va==null)va=sortAsc?Infinity:-Infinity;
      if(vb==null)vb=sortAsc?Infinity:-Infinity;
      if(typeof va==="string")return sortAsc?va.localeCompare(vb):vb.localeCompare(va);
      return sortAsc?(va-vb):(vb-va);
    });
  }

  const table=el("table");
  const thead=el("thead");
  const tr=el("tr");
  TABLE_COLS.forEach(c=>{
    const th=el("th",{onclick:()=>{
      if(sortCol===c.key)sortAsc=!sortAsc;else{sortCol=c.key;sortAsc=true;}
      renderTable();
    }});
    th.innerHTML=c.label+(sortCol===c.key?` <span class="sort-arrow">${sortAsc?"\u25B2":"\u25BC"}</span>`:"");
    tr.appendChild(th);
  });
  thead.appendChild(tr);table.appendChild(thead);

  const tbody=el("tbody");
  rows.forEach(d=>{
    const row=el("tr");
    TABLE_COLS.forEach(c=>{
      const td=el("td");
      const v=getVal(d,c.key);
      td.textContent=c.fmt(v);
      if(c.key==="test")td.style.color=testColor(v);
      row.appendChild(td);
    });
    tbody.appendChild(row);
  });
  table.appendChild(tbody);
  wrap.appendChild(table);
}

/* ── Section auto-hide ── */
function hideEmptySections(){
  const checks={
    bounce:FILTERED.some(d=>d.bounce_blocks!=null),
    g2g3:FILTERED.some(d=>["g2_to_g3","g3_to_g2"].includes(d.test)),
    gds:FILTERED.some(d=>["g1_to_g3_gds","g3_to_g1_gds"].includes(d.test)),
    bidir:FILTERED.some(d=>d.test.startsWith("bidir_")),
  };
  for(const[id,show]of Object.entries(checks)){
    const sec=document.getElementById(id);
    if(sec)sec.style.display=show?"":"none";
  }
}

/* ── Nav IntersectionObserver ── */
const navLinks=$$("nav a[data-sec]");
const secEls=navLinks.map(a=>document.getElementById(a.dataset.sec)).filter(Boolean);
const obsOpts={rootMargin:"-56px 0px -60% 0px",threshold:0};
const observer=new IntersectionObserver(entries=>{
  entries.forEach(en=>{
    if(en.isIntersecting){
      navLinks.forEach(a=>a.classList.toggle("active",a.dataset.sec===en.target.id));
    }
  });
},obsOpts);
secEls.forEach(s=>observer.observe(s));
</script>
</body>
</html>