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I've got myself an Amazon ec2 Micro Instance (A VPN Server) to play around with. The problem is that Amazon charge you for every disc IO you do in a Micro Instance. The instance is running Amazon Linux a flavor of CentOS. I've started a Scala application in Play 2.0(.2) framework on the server and I'm the only one who connects to the application. I have observed that every few second something on the server commits IO transactions, to narrow it down I installed a Linux program called iotop . Here is an output after a couple of seconds. TID PRIO USER DISK READ DISK WRITE SWAPIN IO> 23333 be/4 root 0.00 B/s 11.91 K/s 0.00 % 0.00 % COMMAND java -Dsbt.ivy.home=/usr/play-2.0.2/framework/../repository -Djava.runtime.name=OpenJDK ~/jars/slf4j-api.jar:/usr/play-2.0.2/repository/local/org.slf4j/jul-to-slf4j/1.6.4/jars/j A cat from the log file cat /home/ec2-user/socketTest/logs/application.log 2012-07-05 11:43:31,881 - [INFO] - from play in main Listening for HTTP on port 9000... So Play doesn't write anything to the log file. First question have I understood the iotop correct and that Play indeed is the disc IO thief. If so why do play use IO? My application is a simple websocket example. In essence it echos the input to the output. The IO occurs even thou nothing is pushed thru websockets.

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