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979bf48 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | "use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
Object.defineProperty(exports, "enableMemoryDebuggingMode", {
enumerable: true,
get: function() {
return enableMemoryDebuggingMode;
}
});
const _v8 = /*#__PURE__*/ _interop_require_default(require("v8"));
const _log = require("../../build/output/log");
const _picocolors = require("../picocolors");
const _gcobserver = require("./gc-observer");
const _trace = require("./trace");
function _interop_require_default(obj) {
return obj && obj.__esModule ? obj : {
default: obj
};
}
function enableMemoryDebuggingMode() {
// This will generate a heap snapshot when the program is close to the
// memory limit. It does not give any warning to the user though which
// can be jarring. If memory is large, this may take a long time.
if ('setHeapSnapshotNearHeapLimit' in _v8.default) {
_v8.default.setHeapSnapshotNearHeapLimit(1);
}
// This flag will kill the process when it starts to GC thrash when it's
// close to the memory limit rather than continuing to try to collect
// memory ineffectively.
_v8.default.setFlagsFromString('--detect-ineffective-gcs-near-heap-limit');
// This allows users to generate a heap snapshot on demand just by sending
// a signal to the process.
process.on('SIGUSR2', ()=>{
(0, _log.warn)(`Received SIGUSR2 signal. Generating heap snapshot. ${(0, _picocolors.italic)('Note: this will take some time.')}`);
_v8.default.writeHeapSnapshot();
});
(0, _gcobserver.startObservingGc)();
(0, _trace.startPeriodicMemoryUsageTracing)();
(0, _log.warn)(`Memory debugging mode is enabled. ${(0, _picocolors.italic)('Note: This will affect performance.')}`);
(0, _log.info)(' - Heap snapshots will be automatically generated when the process reaches more than 70% of the memory limit and again when the process is just about to run out of memory.');
(0, _log.info)(` - To manually generate a heap snapshot, send the process a SIGUSR2 signal: \`kill -SIGUSR2 ${process.pid}\``);
(0, _log.info)(' - Heap snapshots when there is high memory will take a very long time to complete and may be difficult to analyze in tools.');
(0, _log.info)(' - See https://nextjs.org/docs/app/building-your-application/optimizing/memory-usage for more information.');
}
//# sourceMappingURL=startup.js.map |