var log4js = require('./lib/log4js') , logger , usage , i; log4js.configure( { appenders: [ { category: "memory-test" , type: "file" , filename: "memory-test.log" }, { type: "console" , category: "memory-usage" }, { type: "file" , filename: "memory-usage.log" , category: "memory-usage" , layout: { type: "messagePassThrough" } } ] } ); logger = log4js.getLogger("memory-test"); usage = log4js.getLogger("memory-usage"); for (i=0; i < 1000000; i++) { if ( (i % 5000) === 0) { usage.info("%d %d", i, process.memoryUsage().rss); } logger.info("Doing something."); }