4 Test_shell has an optional tracing feature. It can be enabled by running
5 with the --enable-tracing option. Tracing causes events to be dropped into
6 a trace file during runtime.
8 This HTML file can be used to render the output from the trace. You'll need
9 to rename your trace data to "trace_data.js" in the same directory with this
10 HTML file, and then you can visualize the trace.
12 Lots of work remains on this tracing tool; currently development is on hold.
23 font-family: "Courier New";
31 border-bottom: 1px dashed black;
32 background-color: #F0F0F0;
48 background-color: #FFFFCC;
50 font-family: "Courier New";
53 border: 1px solid #CCCC88;
62 border: 1px solid silver;
64 background-color: #f0f0f0;
79 background-color: #FFFFCC;
94 border: 1px solid red;
98 background-color: green;
102 background-color: blue;
106 background-color: black;
110 background-color: orange;
114 background-color: gray;
118 background-color: blue;
123 <script src='trace_data.js'></script>
127 var trace_initial_time = 0;
128 var trace_threads = {};
130 var trace_total_time = 0;
132 function process_raw_events() {
133 trace_initial_time = raw_trace_events[0].usec_begin;
136 for (var i in raw_trace_events) {
137 e = raw_trace_events[i];
138 var trace_events = trace_threads["e.tid"];
141 trace_threads["e.tid"] = trace_events;
143 if (e.name.indexOf("heartbeat.") == 0) {
145 } else if (e.type == "BEGIN") {
146 trace_events.push(e);
148 } else if (e.type == "END") {
149 for (var s in stack) {
150 var begin = stack[s];
151 if ((begin.id == e.id) && (begin.name == e.name) &&
152 (begin.pid == e.pid) && (begin.tid == e.tid)) {
153 begin.usec_end = e.usec_begin;
154 begin.duration = begin.usec_end - begin.usec_begin;
155 begin.extra += " " + e.extra;
160 } else if (e.type == "INSTANT") {
161 trace_events.push(e);
166 trace_total_time = e.usec_end - trace_initial_time;
168 trace_total_time = e.usec_begin - trace_initial_time;
171 function compute_scale() {
172 var outer = document.getElementById("outer");
173 scale = Math.floor(trace_total_time / (outer.offsetWidth - (row_height * 2)));
176 function show_details(tid, i, event) {
177 var trace_events = trace_threads["e.tid"];
178 var inner = trace_events[i].name + " " +
179 trace_events[i].duration / 1000 + "ms<br />" +
180 trace_events[i].id + "<br />" +
181 trace_events[i].extra + "<br />";
182 var tooltip = document.getElementById("tooltip");
183 tooltip.innerHTML = inner;
185 event = window.event;
186 tooltip.style.top = event.pageY + 3;
187 tooltip.style.left = event.pageX + 3;
188 tooltip.style.display = "block";
191 function generate_time_scale() {
192 var view_size = window.clientWidth;
193 var body_size = document.body.scrollWidth;
196 var step_ms = Math.floor(scale / 10); // ms per 100px
197 var pow10 = Math.pow(10, Math.floor(Math.log(step_ms) / Math.log(10)));
198 var round = .5 * pow10;
199 step_ms = round * (Math.floor(step_ms / round)); // round to a multiple of round
200 for (var i = step_ms; i < trace_total_time / 1000; i += step_ms) {
201 var x = Math.floor(i * 1000 / scale);
202 inner += "<li class='time_tick' style='left: " + x + "px'>" + i + "</li>";
204 var time_scale = document.getElementById("time_scale");
205 time_scale.innerHTML = inner;
206 time_scale.style.width = document.body.scrollWidth;
209 function generate_io_graph(trace_events, top) {
210 var max_height = 200;
211 var bucket_size = 50000; // millisecs
214 var buckets = new Array();
218 // Go through events and find all read samples.
219 // Aggregate data into buckets.
220 for (var i in trace_events) {
221 var e = trace_events[i];
222 if (e.name != "socket.read") {
226 var bytes = parseInt(e.extra);
229 var start_time = e.usec_begin - trace_initial_time;
230 var mybucket = Math.floor(start_time / bucket_size);
232 if (buckets[mybucket] == undefined) {
233 buckets[mybucket] = 0;
235 buckets[mybucket] += bytes;
237 if (buckets[max_bucket] == undefined ||
238 buckets[max_bucket] < buckets[mybucket]) {
239 max_bucket = mybucket;
243 for (var index = 0; index < buckets.length; index++) {
244 var left = index * Math.floor(bucket_size / scale);
245 var width = Math.floor(bucket_size / scale);
250 if (buckets[index] == undefined) {
253 height = (buckets[index] / buckets[max_bucket]) * max_height;
256 var my_top = max_height - height;
258 var style = "top: " + my_top + "px; left: " + left + "px; width: " + width + "px; height:" + height + "px;";
260 inner += "<li title='" + buckets[index] + " bytes' class='" + cls + "' id='li-" + i + "' style='" + style + "'></li>\n";
263 var subchart = document.createElement('div');
264 subchart.setAttribute("class", "iograph");
265 subchart.setAttribute("id", trace_events[0].tid);
266 subchart.innerHTML = inner;
267 subchart.style.height = max_height;
268 subchart.style.top = top;
269 subchart.style.left = 0;
270 subchart.style.position = "absolute";
271 // subchart.style.width = row_height + last_max_x;
272 var chart = document.getElementById("chart");
273 chart.appendChild(subchart);
275 return top + max_height;
278 function generate_subchart(trace_events, top) {
280 var heights = new Array();
283 var last_max_time = 0;
285 for (var i in trace_events) {
286 var e = trace_events[i];
287 var start_time = e.usec_begin - trace_initial_time;
288 var left = row_height + Math.floor(start_time / scale);
289 var width = Math.floor(e.duration / scale);
296 max_row += row_height;
297 heights[e.id] = max_row;
300 //if (start_time < last_max_time)
301 // top += row_height;
302 var style = "top: " + top + "px; left: " + left + "px; width: " + width + "px;";
303 var js = 'javascript:show_details("' + e.tid + '", ' + i + ', event);';
304 var cls = e.name.split('.')[0];
305 inner += "<li class='" + cls + "' onmouseover='" + js + "' id='li-" + i + "' style='" + style + "'></li>\n";
306 last_max_time = start_time + e.duration;
307 last_max_x = left + width;
309 var subchart = document.createElement('div');
310 subchart.setAttribute("class", "subchart");
311 subchart.setAttribute("id", trace_events[0].tid);
312 subchart.innerHTML = inner;
313 subchart.style.top = start_top + "px";
314 subchart.style.height = top + row_height;
315 subchart.style.width = row_height + last_max_x;
316 subchart.style.position = "absolute";
317 var chart = document.getElementById("chart");
318 chart.appendChild(subchart);
323 function generate_chart() {
324 var chart = document.getElementById("chart");
325 chart.innerHTML = "";
327 for (var t in trace_threads) {
328 top = generate_io_graph(trace_threads[t], top);
329 top = generate_subchart(trace_threads[t], top);
331 generate_time_scale();
334 function change_scale(event) {
336 event = window.event;
340 if (event.wheelDelta) {
341 delta = event.wheelDelta / 120;
342 } else if (event.detail) {
343 delta = - event.detail / 3;
346 var tooltip = document.getElementById("tooltip");
347 tooltip.style.display = "none";
350 scale = Math.floor(scale * factor);
352 scale = Math.floor(scale / factor);
356 if (event.preventDefault)
357 event.preventDefault();
359 event.returnValue = false;
362 function initial_load() {
363 if (window.addEventListener)
364 window.addEventListener('DOMMouseScroll', change_scale, false);
365 window.onmousewheel = document.onmousewheel = change_scale;
367 process_raw_events();
374 <body onload='initial_load();'>
376 <h2>Trace Events</h2>
377 <div id="instructions">
378 Use shift+mouse-wheel to zoom in and out.
380 <div id="time_scale"></div>
383 <span class="url"> </span> URL<br />
384 <span class="http"> </span> HTTP<br />
385 <span class="socket"> </span> Socket<br />
386 <span class="v8"> </span> V8<br />
387 <span class="loop"> </span> TASKS<br />
393 <div id="tooltip" ondblclick="this.style.display = 'none';"></div>