我已经调用了最大为2048(mb?)的节点,但没有成功,因此,在这一点上,我认为继续提高内存限制是没有道理的,尤其是当我的代码效率低下时。这是致命错误的答案:接近堆限制的无效标记压缩分配失败-尽管ionic 3中的JavaScript堆内存不足。
参考: node --max-old-space-size=2048
为简洁起见:
<--- Last few GCs --->
io[5481:0x5693440] 286694 ms: Mark-sweep 2048.0 (2051.1) -> 2047.3 (2051.3) MB, 1268.3 / 0.0 ms (+ 0.0 ms in 13 steps since start of marking, biggest step 0.0 ms, walltime since start of marking 1272 ms) (average mu = 0.087, current mu = 0.003) allocatio[5481:0x
5693440] 290098 ms: Mark-sweep 2048.2 (2051.3) -> 2047.5 (2051.3) MB, 3398.6 / 0.0 ms (+ 0.0 ms in 13 steps since start of marking, biggest step 0.0 ms, walltime since start of marking 3404 ms) (average mu = 0.026, current mu = 0.002) allocatio
<--- JS stacktrace --->
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
1: 0xa2b020 node::Abort() [node]
2: 0x97a467 node::FatalError(char const*, char const*) [node]
3: 0xb9e0ee v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
4: 0xb9e467 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
5: 0xd3e875 [node]
6: 0xd3f21b v8::internal::Heap::RecomputeLimits(v8::internal::GarbageCollector) [node]
7: 0xd4d012 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
8: 0xd4de65 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
9: 0xd5082c v8::internal::Heap::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]
10: 0xd1fecb v8::internal::Factory::NewFillerObject(int, bool, v8::internal::AllocationType, v8::internal::AllocationOrigin) [node]
11: 0x10501ef v8::internal::Runtime_AllocateInYoungGeneration(int, unsigned long*, v8::internal::Isolate*) [node]
12: 0x13a9ed9 [node]
Aborted
npm ERR! code ELIFECYCLE
这是我有问题的功能:
public async upsertToDb(courses: Record<string, Record<string, any>>): Promise<string> {
this.courseTransformationUtility.transformToFlatStructure(courses);
const flatCourses: Array<Course> = this.courseTransformationUtility.getFlatCourses();
const flatClasses: Array<Class> = this.courseTransformationUtility.getFlatClasses();
console.info(`Courses exploded into ${flatCourses.length} rows.`)
console.info(`Classes exploded into ${flatClasses.length} rows.`)
await this._deleteTable("Course");
await this._deleteTable("Class");
for(let i = 0; i < flatCourses.length; i+=100) {
Backendless.Data.of(Course).bulkCreate(flatCourses.slice(i, i + 100))
.then(() => {
process.stdout.write(".");
})
.catch((e: Error) => console.info(e));
}
for(let i = 0; flatClasses.length; i+=100) {
Backendless.Data.of(Class).bulkCreate(flatClasses.slice(i, i + 100))
.then(() => {
process.stdout.write(".");
})
.catch((e: Error) => console.info(e));
}
return "";
}
如果我注释掉,第二个循环节点将在默认内存设置上运行此命令,而不会出现任何问题。如果我不得不猜测这个问题与异步有关,但是我真的不确定。如果这是问题所在,我们可以完全取消同步吗?抱歉,这里有很多问题我没有深度回答。
Promise.all不是解决方案,至少就我而言。
for(let i = 0; i < flatCourses.length; i+=100) {
let promise: Promise<Array<string>> = Backendless.Data.of(Course).bulkCreate(flatCourses.slice(i, i + 100));
promise.then(() => process.stdout.write('.'));
coursePromises.push(promise);
}
await Promise.all(coursePromises.slice(0, Math.floor(coursePromises.length/2))).then(() => console.info("1/4"));
await Promise.all(coursePromises.slice(Math.floor(coursePromises.length/2))).then(() => console.info("2/4"));
for(let i = 0; flatClasses.length; i+=100) {
let promise: Promise<Array<string>> = Backendless.Data.of(Class).bulkCreate(flatClasses.slice(i, i + 100));
promise.then(() => process.stdout.write('.'));
classPromises.push(promise);
}
await Promise.all(classPromises.slice(0, Math.floor(classPromises.length/2))).then(() => console.info("3/4"));
await Promise.all(classPromises.slice(Math.floor(classPromises.length/2))).then(() => console.info("4/4"));
测井
Using term 202008...
Publishing 2113 courses...
Courses exploded into 11630 rows.
Classes exploded into 10986 rows.
....................................................................................................................1/4
.2/4
<--- Last few GCs --->
io[5628:0x5a47390] 310095 ms: Mark-sweep 2047.4 (2050.7) -> 2046.7 (2051.0) MB, 1935.6 / 0.0 ms (+ 0.0 ms in 14 steps since start of marking, biggest step 0.0 ms, walltime since start of marking 1941 ms) (average mu = 0.117, current mu = 0.003) allocatio[5628:0x
5a47390] 311960 ms: Mark-sweep 2047.6 (2051.0) -> 2046.9 (2051.2) MB, 1860.4 / 0.0 ms (+ 0.0 ms in 13 steps since start of marking, biggest step 0.0 ms, walltime since start of marking 1865 ms) (average mu = 0.063, current mu = 0.003) allocatio
<--- JS stacktrace --->
您可以一次执行一次所有异步操作,或者一次执行一次课程和课程。
一次一次完成所有操作。
for (let i = 0; i < flatCourses.length; i+=100) {
try {
await Backendless.Data.of(Course).bulkCreate(flatCourses.slice(i, i + 100))
process.stdout.write(".");
} catch (e) {
console.info(e)
}
}
// Do the same for flatClasses
一次课程和一堂课
const promises = []
for (let i = 0; i < flatCourses.length; i+=100) {
const promise = Backendless.Data.of(Course).bulkCreate(flatCourses.slice(i, i + 100))
promise.then(() => {
process.stdout.write(".");
})
.catch((e: Error) => console.info(e));
promises.push(promise)
}
await Promise.all(promises)
// Do the same for flatClasses
更复杂的方法涉及一次执行N次操作,但是如果这些简单的方法解决了您的问题,我走的不会太远。
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我来说两句