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1 year ago
'use strict';
var assert = require('assert');
var cluster = require('cluster');
var path = require('path');
var numCPUs = require('os').cpus().length;
var lmdb = require('..');
const MAX_DB_SIZE = 256 * 1024 * 1024;
if (cluster.isMaster) {
// The master process
var env = new lmdb.Env();
env.open({
path: path.resolve(__dirname, './testdata'),
maxDbs: 10,
mapSize: MAX_DB_SIZE,
maxReaders: 126
});
var dbi = env.openDbi({
name: 'cluster',
create: true
});
var workerCount = Math.min(numCPUs * 2, 20);
var value = Buffer.from('48656c6c6f2c20776f726c6421', 'hex');
// This will start as many workers as there are CPUs available.
var workers = [];
for (var i = 0; i < workerCount; i++) {
var worker = cluster.fork();
workers.push(worker);
}
var messages = [];
workers.forEach(function(worker) {
worker.on('message', function(msg) {
messages.push(msg);
// Once every worker has replied with a response for the value
// we can exit the test.
if (messages.length === workerCount) {
dbi.close();
env.close();
for (var i = 0; i < messages.length; i ++) {
assert(messages[i] === value.toString('hex'));
}
process.exit(0);
}
});
});
var txn = env.beginTxn();
for (var i = 0; i < workers.length; i++) {
txn.putBinary(dbi, 'key' + i, value);
}
txn.commit();
for (var i = 0; i < workers.length; i++) {
var worker = workers[i];
worker.send({key: 'key' + i});
};
} else {
// The worker process
var env = new lmdb.Env();
env.open({
path: path.resolve(__dirname, './testdata'),
maxDbs: 10,
mapSize: MAX_DB_SIZE,
maxReaders: 126,
readOnly: true
});
var dbi = env.openDbi({
name: 'cluster'
});
process.on('message', function(msg) {
if (msg.key) {
var txn = env.beginTxn({readOnly: true});
var value = txn.getBinary(dbi, msg.key);
if (value === null) {
process.send("");
} else {
process.send(value.toString('hex'));
}
txn.abort();
}
});
}