ram64/lib/worker/lru.js

Multi-threaded 64bit memory cache database inspired by redis-like features

"use strict";
exports.evict = evict;
exports.isLRUEnabled = void 0;
var _workerData = require("./worker-data");
var _shards = require("./shards");
var _process = require("process");
const maxMemory = _workerData.workerData.maxMemory ?? Infinity;
const EVICTIONS_PER_CYCLE = 200; // should be sufficiently aggressive with minimal impact on performance
const isLRUEnabled = (_workerData.workerData.maxMemory ?? 0) > 0;
exports.isLRUEnabled = isLRUEnabled;
function evict() {
    let shardI = 0;
    if ((0, _process).memoryUsage().rss > maxMemory) {
        let cycle = 0;
        while(cycle < EVICTIONS_PER_CYCLE){
            let { map  } = _shards.Shards[shardI];
            const nextKey = map.keys().next().value;
            if (nextKey !== undefined) {
                map.delete(nextKey);
            }
            cycle++; // next shard regardless if there was a delete -- avoids poor memory settings causing infinite loops
            shardI = (shardI + 1) % _shards.Shards.length;
        }
    }
}

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