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Startup times

The report intended to show the entire application startup time information to simplify searching for bottlenecks. It's hard to measure everything exactly from a bundle, but the report will try to show the time spent in each phase (init, run, web) and time of each registered dropwizard bundle.

GuiceBundle.builder()
    .printStartupTime()

Sample output:

INFO  [2025-03-27 09:12:27,435] ru.vyarus.dropwizard.guice.debug.StartupTimeDiagnostic: Application startup time: 

    JVM time before                    : 1055 ms

    Application startup                : 807 ms
        Dropwizard initialization          : 127 ms
            GuiceBundle                        : 123 ms (finished since start at 127 ms)
                Bundle builder time                : 38 ms
                Hooks processing                   : 3.23 ms
                    StartupDiagnosticTest$Test1$$Lambda/0x0000711de72a1d70: 2.37 ms
                Classpath scan                     : 44 ms
                Commands processing                : 4.41 ms
                    DummyCommand                       : 0.42 ms
                    NonInjactableCommand               : 3.16 ms
                Bundles lookup                     : 1.15 ms
                Guicey bundles init                : 3.24 ms
                    WebInstallersBundle                : 0.52 ms
                    CoreInstallersBundle               : 1.83 ms
                Installers time                    : 21 ms
                    Installers resolution              : 15 ms
                    Scanned extensions recognition     : 6.13 ms
                Listeners time                     : 1.35 ms
                    ConfigurationHooksProcessedEvent   : 0.23 ms
                    BeforeInitEvent                    : 0.59 ms
                    BundlesResolvedEvent               : 0.009 ms
                    BundlesInitializedEvent            : 0.43 ms
                    CommandsResolvedEvent              : 0.006 ms
                    InstallersResolvedEvent            : 0.01 ms
                    ClasspathExtensionsResolvedEvent   : 0.009 ms
                    InitializedEvent                   : 0.007 ms

        Dropwizard run                     : 679 ms
            Configuration and Environment      : 483 ms
            GuiceBundle                        : 196 ms
                Configuration analysis             : 20 ms
        ...

Limitations

  • Can't show init time of dropwizard bundles, registered before the guice bundle (obviously)
  • Applicaion#run method time measured as part of "web" (the bundle can't see this point, but should not be a problem)

The report could be also enabled for compiled application: -Dguicey.hooks=startup-time

Before time

The report can't know what was happening before application initialization (jvm startup time), but this is usually a meaningful time (while real person waits for application startup).

So all time before application is indicated with (value obtained from MX bean):

JVM time before : 1055 ms