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POPlay constantly writes to disc? Causing higher bill on Amazon ec2
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copied!<p>I've got myself an Amazon ec2 Micro Instance (A VPN Server) to play around with.<br/> The problem is that Amazon charge you for every disc IO you do in a Micro Instance.<br/> The instance is running Amazon Linux a flavor of CentOS.</p> <p>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.</p> <p>I have observed that every few second something on the server commits IO transactions, to narrow it down I installed a Linux program called <code>iotop</code>.</p> <p>Here is an output after a couple of seconds.</p> <pre><code>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 </code></pre> <p>A cat from the log file</p> <pre><code>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... </code></pre> <p>So Play doesn't write anything to the log file.</p> <p>First question have I understood the iotop correct and that Play indeed is the disc IO thief.<br/> If so why do play use IO?</p> <p>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.</p>

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