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POPeculiar JRE behaviour running RMI server under load, should I worry?
 

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  1. POPeculiar JRE behaviour running RMI server under load, should I worry?
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    <p>I've been developing a minimalistic Java rich client CRUD application framework for the past few years, mostly as a hobby but also actively using it to write applications for my current employer.</p> <p>The framework provides database access to clients either via a local JDBC based connection or a lightweight RMI server. Last night I started a load testing application, which ran 100 headless clients, bombarding the server with requests, each client waiting only 1 - 2 seconds between running simple use cases, consisting of selecting records along with associated detail records from a simple e-store database (<a href="http://chinookdatabase.codeplex.com/" rel="nofollow noreferrer">Chinook</a>).</p> <p>This morning when I looked at the telemetry results from the server profiling session I noticed something which to me seemed strange (and made me keep the setup running for the remainder of the day), I don't really know what conclusions to draw from it.</p> <p>Here are the results:</p> <p><a href="http://internet.is/darris/jminor_telemetry/Memory_telemetry.html" rel="nofollow noreferrer">Memory</a><br> <a href="http://internet.is/darris/jminor_telemetry/GC_Activity_telemetry.html" rel="nofollow noreferrer">GC activity</a><br> <a href="http://internet.is/darris/jminor_telemetry/Threads_telemetry.html" rel="nofollow noreferrer">Threads</a><br> <a href="http://internet.is/darris/jminor_telemetry/CPU_Load_telemetry.html" rel="nofollow noreferrer">CPU load</a></p> <p>Interesting, right?</p> <p>So the question is, is this normal or erratic? Is this simply the JRE (1.6.0_03 on Windows XP) doing it's thing (perhaps related to the JRE configuration) or is my framework design somehow causing this?</p> <p>Running the server against MySQL as opposed to an embedded H2 database does not affect the pattern.</p> <p>I am leaving out the details of my server design, but I'll be happy to elaborate if this behaviour is deemed erratic.</p>
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    1. USdarri
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    1. CO@darri, a question-editing suggestion: I'd recommend taking smaller versions of your larger charts and putting snapshots right into the question, even if they link to your larger pictures.
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    2. COObviously you need to set up a cron task to restart you process every 8-10 hours. Problem solved! Honestly, that is not normal and it is not something you should tolerate. I the load on the application basically stable during this time? Could you identify any threads that had gone off into the weeds or the like? Is this the trace from overnight? Is the 8 hours of quiet because people were not using the system?
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    3. CO@Ukko, the only load on the system apart from the server/clients (which is stable) was the VNC server I was using from work when checking out the situation and some misc. background apps (this is your standard home workstation, mostly idle).
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