我已经将 pm2 从 2.10.1 更新到 3.5.1。与旧版本相比，god daemon 进程的内存使用率较高。此外，启动后约 15 分钟，pm2 突然终止并出现以下错误。
==== JS stack trace =========================================
0: ExitFrame [pc: 0x24b91f2dbe1d]
Security context: 0x065f6f41e6e9 <JSObject>
1: /* anonymous */(aka /* anonymous */) [0x162edca8f91] [/usr/lib/node_modules/pm2/node_modules/js-git/mixins/fs-db.js:~300] [pc=0x24b91f6da008](this=0x0308a98826f1 <undefined>,data=0x13d779ef8e21 <Object map = 0x2d75412e0a29>)
2: arguments adaptor frame: 3->1
3: parseIndex(aka parseIndex) [0x3c7e7b5b4151] [/usr/lib/node_modules/pm2/node_modules/...
FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
1: 0x8f9d10 node::Abort() [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
2: 0x8f9d5c [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
3: 0xaffd0e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
4: 0xafff44 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
5: 0xef4152 [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
6: 0xef4258 v8::internal::Heap::CheckIneffectiveMarkCompact(unsigned long, double) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
7: 0xf00332 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
8: 0xf00c64 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
9: 0xf0215a v8::internal::Heap::CollectAllAvailableGarbage(v8::internal::GarbageCollectionReason) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
10: 0xf0393e v8::internal::Heap::AllocateRawWithRetryOrFail(int, v8::internal::AllocationSpace, v8::internal::AllocationAlignment) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
11: 0xecc9c6 v8::internal::Factory::AllocateRawArray(int, v8::internal::PretenureFlag) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
12: 0xecd24a v8::internal::Factory::NewFixedArrayWithFiller(v8::internal::Heap::RootListIndex, int, v8::internal::Object*, v8::internal::PretenureFlag) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
13: 0xecd2f0 v8::internal::Handle<v8::internal::FixedArray> v8::internal::Factory::NewFixedArrayWithMap<v8::internal::FixedArray>(v8::internal::Heap::RootListIndex, int, v8::internal::PretenureFlag) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
14: 0x100c7d9 v8::internal::HashTable<v8::internal::NameDictionary, v8::internal::NameDictionaryShape>::New(v8::internal::Isolate*, int, v8::internal::PretenureFlag, v8::internal::MinimumCapacity) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
15: 0x10316d2 v8::internal::BaseNameDictionary<v8::internal::NameDictionary, v8::internal::NameDictionaryShape>::EnsureCapacity(v8::internal::Handle<v8::internal::NameDictionary>, int) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
16: 0x10318a0 v8::internal::BaseNameDictionary<v8::internal::NameDictionary, v8::internal::NameDictionaryShape>::AddNoUpdateNextEnumerationIndex(v8::internal::Handle<v8::internal::NameDictionary>, v8::internal::Handle<v8::internal::Name>, v8::internal::Handle<v8::internal::Object>, v8::internal::PropertyDetails, int*) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
17: 0x1031b4b v8::internal::BaseNameDictionary<v8::internal::NameDictionary, v8::internal::NameDictionaryShape>::Add(v8::internal::Handle<v8::internal::NameDictionary>, v8::internal::Handle<v8::internal::Name>, v8::internal::Handle<v8::internal::Object>, v8::internal::PropertyDetails, int*) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
18: 0x1195188 v8::internal::Runtime_AddDictionaryProperty(int, v8::internal::Object**, v8::internal::Isolate*) [PM2 v3.5.1: God Daemon (/home/invoker/.pm2)]
19: 0x24b91f2dbe1d
2019-07-30T12:35:09: PM2 log: ===============================================================================
2019-07-30T12:35:09: PM2 log: --- New PM2 Daemon started ----------------------------------------------------
2019-07-30T12:35:09: PM2 log: Time : Tue Jul 30 2019 12:35:09 GMT+0430 (Iran Daylight Time)
2019-07-30T12:35:09: PM2 log: PM2 version : 3.5.1
2019-07-30T12:35:09: PM2 log: Node.js version : 10.16.0
2019-07-30T12:35:09: PM2 log: Current arch : x64
2019-07-30T12:35:09: PM2 log: PM2 home : /home/invoker/.pm2
2019-07-30T12:35:09: PM2 log: PM2 PID file : /home/invoker/.pm2/pm2.pid
2019-07-30T12:35:09: PM2 log: RPC socket file : /home/invoker/.pm2/rpc.sock
2019-07-30T12:35:09: PM2 log: BUS socket file : /home/invoker/.pm2/pub.sock
2019-07-30T12:35:09: PM2 log: Application log path : /home/invoker/.pm2/logs
2019-07-30T12:35:09: PM2 log: Process dump file : /home/invoker/.pm2/dump.pm2
2019-07-30T12:35:09: PM2 log: Concurrent actions : 2
2019-07-30T12:35:09: PM2 log: SIGTERM timeout : 1600
2019-07-30T12:35:09: PM2 log: ===============================================================================
我使用以下命令启动 pm2：
pm2 start process.config.js --node-args="--max_new_space_size=4096 --max_executable_size=4096 --max_old_space_size=4096"
在 process.config.js 中有大约 100 个进程，格式如下：
{
"services": [
{
"name": "a",
"language": "nodejs",
"replicas": 1,
"script": "./a/index.js",
"log_type": "json",
"exec_mode": "fork",
"max_memory_restart": "500M",
"env_production": {
"NODE_ENV": "PRODUCTION",
"SERVICE": "a"
}
},
{
"name": "b",
"language": "nodejs",
"replicas": 1,
"script": "./b/index.js",
"log_type": "json",
"exec_mode": "fork",
"max_memory_restart": "500M",
"env_production": {
"NODE_ENV": "PRODUCTION",
"SERVICE": "b"
}
}
]
}
我对旧版本的 pm2 没有任何问题，几天后也没有停止，但在 pm2 3.5.1 中它只能运行 10-15 分钟。
答案1
PM2 使用 vizion，并且 js-git 依赖项无法与大型 git 存储库正常工作。
您可以发现该模块尝试在 js-git 源中加载 .git/objects/pack：
function loadIndex() {
var indexFile = pathJoin(packDir, "pack-" + packHash + ".idx" );
fs.readFile(indexFile, function (err, buffer) {
if (!buffer) return callback(err);
try {
cachedIndexes[packHash] = parseIndex(buffer);
}
catch (err) { return callback(err); }
onIndex();
});
}
如果你有巨大的 git repo，这里很容易出现 OOM。如果你不需要这样的功能，你可以禁用 vizion（默认情况下是 true）。
http://pm2.keymetrics.io/docs/usage/application-declaration/