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If I am designing a test on sorting algorithm can I do this way to avoid JVM warmup ? Thank you!
double count = 0;
double start, end;
for(int r = 0; r < warmup; r++) {
// do test
}
for(int t = 0; t < runs; t++){
start = System.nanoTime();
// do test
end = System.nanoTime();
count += start - end;
}
double avg = count/avg
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Why does the JVM require warmup? Bookmark this question. Show activity on this post. I understand that in the Java virtual machine (JVM), warmup is potentially required as Java loads classes using a lazy loading process and as such you want to ensure that the objects are initialized before you start the main transactions.
I understand that in the Java virtual machine (JVM), warmup is potentially required as Java loads classes using a lazy loading process and as such you want to ensure that the objects are initialized before you start the main transactions. I am a C++ developer and have not had to deal with similar requirements.
The first request made to a Java or JVM web application is often substantially slower than the average response time over the life of the process. This warm-up period can usually be attributed to lazy class loading and just-in-time compilation, which optimize the JVM for subsequent requests that execute identical code.
Warming Up a Java Process 1 Prebooting an application. In order to do anything with a process before the router starts sending it requests, you must enable Heroku’s Preboot feature. 2 Creating a warm-up script. ... 3 Enabling the warm-up script. ... 4 Customizing the warm-up script. ... 5 Further reading. ...
The JVM warmup usually refers to the time it takes for the JVM to find the hotspots and JIT these sections of the code. If you run your actual tests a few hundred (actually a few thousand I believe) times you should be fairly good to go.
You should however know that, even if you do this, there are no guarantees. You'll have to experiment with your particular JVM to figure out how much work you have to do before the vital parts is JITed and so on.
In this little case study the JIT compilation kicked in after 1700 calls.
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