【发布时间】：2020-09-11 16:14:42
【问题描述】：
我没有在网上找到很多关于这个问题的信息，感觉就像我是唯一遇到这个问题的用户。 我阅读了一些关于人们如何衡量性能的 cmets，并在下面包含了代码和测量结果。
我正在测试 Firestore 的 3 个操作：
- 阅读
- 写
- onSnapshot（写调用和通知通知之间的时间） 改变）
在 3 个环境中：Web 客户端、模拟器、云功能生产 (nodejs10)。
网络客户端的性能非常好，即时。 模拟器很棒，即时（见下面的结果）。
生产缓慢，数字四舍五入。
- 读取：3700 毫秒
- 写入：2900 毫秒
- 快照：2704 毫秒
这是在臭名昭著的冷启动之后。
我在这里遗漏了什么明显的东西吗？
代码：
function epochms() {
return Math.floor(new Date());
}
async function run10Times() {
for (var i = 0; i < 10; ++i)
await updateRecord("Tests/manager/Updates", i.toString().padStart(2, '0'));
}
async function updateRecord(colpath, id) {
let obj = {id};
let startRead = epochms();
await db.collection("Tests").doc("manager").get();
let startWrite = epochms();
await db.collection(colpath).doc(obj.id).set({startRead, endRead:startWrite, startWrite});
let endWrite = epochms();
await db.collection(colpath).doc(obj.id).update({endWrite});
db.collection(colpath).doc(obj.id).onSnapshot(async (doc) => {
log.log(`[${id}] test.onSnapshot`);
let snapshotReceived = epochms();
obj = { id:doc.id, ...doc.data() };
if (obj.snapshotStarted && !obj.snapshotReceived)
await db.collection(colpath).doc(obj.id).update({snapshotReceived});
else
log.log(`[${id}] test.onSnapshot late, ignore`);
});
let snapshotStarted = epochms();
await db.collection(colpath).doc(obj.id).update({snapshotStarted});
}
exports.emulatorScheduledEventUpdate = functions.https.onCall(() => {
run10Times();
return 0;
});
云函数中的输出
00
Read: 91192ms
Write: 5301ms
Snapshot: 16000ms
01
Read: 12400ms
Write: 2700ms
Snapshot: 4501ms
02
Read: 4201ms
Write: 2700ms
Snapshot: 3901ms
03
Read: 4301ms
Write: 900ms
Snapshot: 3300ms
04
Read: 4599ms
Write: 1901ms
Snapshot: 4901ms
05
Read: 4400ms
Write: 2302ms
Snapshot: 2700ms
06
Read: 4200ms
Write: 900ms
Snapshot: 2396ms
07
Read: 4900ms
Write: 1099ms
Snapshot: 4602ms
08
Read: 2300ms
Write: 1500ms
Snapshot: 2500ms
09
Read: 3300ms
Write: 1900ms
Snapshot: 2400ms
模拟器输出
00
Read: 238ms
Write: 27ms
Snapshot: 18ms
01
Read: 7ms
Write: 13ms
Snapshot: 17ms
02
Read: 5ms
Write: 12ms
Snapshot: 12ms
03
Read: 5ms
Write: 16ms
Snapshot: 16ms
04
Read: 4ms
Write: 24ms
Snapshot: 18ms
05
Read: 4ms
Write: 26ms
Snapshot: 16ms
06
Read: 4ms
Write: 31ms
Snapshot: 20ms
07
Read: 6ms
Write: 28ms
Snapshot: 17ms
08
Read: 5ms
Write: 34ms
Snapshot: 26ms
09
Read: 5ms
Write: 10ms
Snapshot: 18ms
package.json
{
"name": "functions",
"description": "Cloud Functions for Firebase",
"main": "dist/index.js",
"scripts": {
"lint": "xo",
"build": "babel 'src' --out-dir 'dist' --source-maps",
"watch": "yarn build --watch",
"serve": "yarn watch & yarn firebase emulators:start --only firestore,functions --inspect-functions",
"predeploy": "yarn build",
"deploy": "yarn firebase deploy --only functions",
"fdeploy": "yarn firebase deploy --only functions:tests-scheduledEventUpdate",
"fdelete": "firebase functions:delete tests-scheduledEventUpdate",
"logs": "watch -n 5 firebase functions:log -n 90"
},
"engines": {
"node": "10"
},
"dependencies": {
"@grpc/grpc-js": "^1.0.3",
"core-js": "^3.6.5",
"debug": "^4.1.1",
"firebase": "^7.14.2",
"firebase-admin": "^8.11.0",
"firebase-functions": "^3.6.1",
"google-gax": "^2.3.1",
"grpc": "^1.24.2",
"request": "^2.88.2"
},
"devDependencies": {
"@babel/cli": "^7.4.3",
"@babel/core": "^7.4.3",
"@babel/preset-env": "^7.4.3",
"firebase-functions-test": "^0.2.1",
"firebase-tools": "^8.1.1",
"xo": "^0.24.0"
},
"private": true
}
谢谢，
【问题讨论】：
-
您使用的是哪个运行时：节点 8、10 或 12？如果添加 package.json 文件也会很有用。
-
我使用的是节点 10。
标签： javascript firebase google-cloud-firestore google-cloud-functions