12/1/2023 0 Comments App startup time![]() Another option is to run spring boot application with -debug option: java -jar myproject-0.0.1-SNAPSHOT. To see full list of auto-configuration included, just run logging of in DEBUG mode ( .toconfigure=DEBUG in application.properties). So you may want to narrow down only auto-configuration that is needed for your app. Spring Boot does a lot of auto-configuration that may not be needed. ![]() There have been reports of hostname resolution being slow, but I didn't find it to be a problem for the apps I tested.Also, -XX:TieredStopAtLevel=1 would probably slow down your first request. Dave recommended JVM argument -XX:TieredStopAtLevel=1, but my tests didn't show significant improvement with that.Excluding unnecessary autoconfigurations helps.Starting the JVM with -Xverify:none helps significantly.Feel free to use it and provide feedback. I designed it such that it can be used to measure startup time for any Spring Boot application, using the executable jar produced by bootJar (previously called bootRepackage in Boot 1.5) Gradle task. The result is the boot-benchmark project. I had a similar use case as well, so I took Dave's approach of micro-benchmarking with JMH and ran with it. The most useful, and methodical approach for debugging Boot startup has been done by Dave Syer. There is also a ticket 7939 open to adding timing information to condition evaluation, but it doesn't seem to have a specific ETA. The Spring Boot team went through an exercise for reducing startup time for Boot 2.0, and ticket 11226 contains a lot of useful information. The other answers don't go into the depth I like to see and provide no scientific evidence. I see some other efforts in Spring Boot itself, such as Investigate Tomcat JarScanning speed improvements, but that is Tomcat specific and has been abandoned.Īlthough aimed at integration tests, suggests using lazy-init=true, however I do not know how to apply this to all beans in Spring Boot using Java configuration - any pointers here?Īny (other) suggestions would be welcome. I assume that enhancing Spring to have parallel bean initialization during startup would speed up things, but that enhancement request has been open since 2011, without any progress. If it really is the cause, how can I limit it, so it gets faster? For example, if I know that some dependency or package does not contain anything that Spring should be scanning, is there a way to limit that?.Why is it important As you know, well-optimized performance and running at the maximum possible speed are some of the most important factors contributing to the success of mobile. ![]() I assume the issue is classpath scanning, but I am not sure how to: The following article is a part of The Ultimate Guide to React Native Optimization and describes how to optimize your Android application startup time with Hermes. The application itself is rather small at this point, so I assume most of the time is related to the added dependencies, not the app classes themselves. ![]() While that might not be much compared to what are "used" to, I'm unhappy that it takes that much, mostly because it breaks the development flow. Just doing a n(source, args) takes 10 seconds. I've added a lot of dependencies (unfortunately, looks I need all of them) and the startup time went up quite a lot. ![]()
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