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add script to measure cost of entity lookup by id

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Andrew Meadows 2017-07-07 09:59:13 -07:00
parent c7ec82f98a
commit de21391062
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scripts/developer/tests/entityLookupCostMeasurement.js Normal file
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// Creates a large number of entities on the cardinal planes of the octree (all
// objects will live in the root octree element). Measures how long it takes
// to update the properties of the first and last entity. The difference
// between the two measurements shows how the cost of lookup changes as a
// function of the number of entities. For best results run this in an
// otherwise empty domain.
var firstId;
var lastId;
var NUM_ENTITIES_ON_SIDE = 25;
// create the objects
createObjects = function () {
var STRIDE = 0.75;
var WIDTH = 0.5;
var DIMENSIONS = { x: WIDTH, y: WIDTH, z: WIDTH };
var LIFETIME = 20;
var properties = {
name: "",
type : "Box",
dimensions : DIMENSIONS,
position : { x: 0, y: 0, z: 0},
lifetime : LIFETIME,
color : { red:255, green: 64, blue: 255 }
};
// xy
var planeName = "xy";
for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
properties.name = "Box-" + planeName + "-" + i + "." + j;
properties.position = { x: i * STRIDE, y: j * STRIDE, z: 0 };
var red = i * 255 / NUM_ENTITIES_ON_SIDE;
var green = j * 255 / NUM_ENTITIES_ON_SIDE;
var blue = 0;
properties.color = { red: red, green: green, blue: blue };
if (i == 0 && j == 0) {
firstId = Entities.addEntity(properties);
} else {
Entities.addEntity(properties);
}
}
}
// yz
var planeName = "yz";
for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
properties.name = "Box-" + planeName + "-" + i + "." + j;
properties.position = { x: 0, y: i * STRIDE, z: j * STRIDE };
var red = 0;
var green = i * 255 / NUM_ENTITIES_ON_SIDE;
var blue = j * 255 / NUM_ENTITIES_ON_SIDE;
properties.color = { red: red, green: green, blue: blue };
Entities.addEntity(properties);
}
}
// zx
var planeName = "zx";
for (var i = 0; i < NUM_ENTITIES_ON_SIDE; ++i) {
for (var j = 0; j < NUM_ENTITIES_ON_SIDE; ++j) {
properties.name = "Box-" + planeName + "-" + i + "." + j;
properties.position = { x: j * STRIDE, y: 0, z: i * STRIDE };
var red = j * 255 / NUM_ENTITIES_ON_SIDE;
var green = 0;
var blue = i * 255 / NUM_ENTITIES_ON_SIDE;
properties.color = { red: red, green: green, blue: blue };
lastId = Entities.addEntity(properties);
}
}
};
createObjects();
// measure the time it takes to edit the first and last entities many times
// (requires a lookup by entityId each time)
changeProperties = function (id) {
var newProperties = { color : { red: 255, green: 255, blue: 255 } };
Entities.editEntity(id, newProperties);
}
// first
var NUM_CHANGES = 10000;
var firstStart = Date.now();
for (var k = 0; k < NUM_CHANGES; ++k) {
changeProperties(firstId);
}
var firstEnd = Date.now();
var firstDt = firstEnd - firstStart;
// last
var lastStart = Date.now();
for (var k = 0; k < NUM_CHANGES; ++k) {
changeProperties(lastId);
}
var lastEnd = Date.now();
var lastDt = lastEnd - lastStart;
// print the results
var numEntities = 3 * NUM_ENTITIES_ON_SIDE * NUM_ENTITIES_ON_SIDE;
print("numEntities = " + numEntities + " numEdits = " + NUM_CHANGES + " firstDt = " + firstDt + " lastDt = " + lastDt);