Why JVMTI sampling is better than async sampling on modern JVMs
In recent years, "async sampling" has been hyped as a better way of CPU profiling on the JVM. While this has been true for some time, it is no longer the case. This blog post explains the history of sampling and the current state of the art.
How invokedynamic makes lambdas fast
Recently, we have been at work rewriting our website in Kotlin. Instead of a view technology that uses string templates with embedded logic, we now use the Kotlin HTML builder to develop views as pure Kotlin code. This has a number of advantages, like being able to easily refactor common code. Also, the performance of such views is much better than that of string templates, which contain interpreted code snippets.
When measuring the performance, we noticed that a lot of anonymous classes were created for our views and their loading
time was significant. Code that uses the Kotlin HTML builder is very lambda-heavy and as of Kotlin 1.9, lambdas are
implemented as anonymous classes. The JVM has a sophisticated mechanism to avoid creating classes at compile time that
was introduced in Java 8 - the LambdaMetafactory
and invokedynamic.
The JVM developers also claimed that the performance would be better than anonymous classes. So why does Kotlin not use
that?
Improved Kubernetes authentication handling in JProfiler
Since version 13, JProfiler supports profiling on Kubernetes clusters with no extra configuration.
JProfiler 13.0.6 added an important improvement for profiling a JVM in Kubernetes clusters where authentication is set up in such a way that the authentication plugin prints instructions on stdout.
New web license service and improvements for the on-premises server
Customers with floating licenses now have more flexibility: Starting with with the most recent releases of JProfiler and install4j, we now offer a web license service, so you do not have to install a license server yourself. If you choose that option, you will receive a license key that can be distributed to all developers and is entered just like a single license key. This option requires the ability to make an outgoing HTTP request to our license server.
Going forward, we will be offering both the web as well as the the on-premises solution. For the time being, the on-premises option remains the default and you can contact us if you would like to switch to the web option.
Support for macOS Apple Silicon
Please note: Several JDK providers now offer the macos-aarch64 architecture and there is no need anymore to create the bundle yourself, install4j can do this for you automatically.
(Edited on 2021-01-07 to include changes for install4j 8.0.10)
Apple machines with the new ARM architecture are now available. While you can run existing x64 binaries for on ARM machines through Rosetta, the performance may be impacted significantly. install4j 8.0.9 addresses this concern with support for native ARM binaries.
Introducing perfino
All screen casts now with HTML5 video
There still is a Flash fallback for ancient browsers that do not support the "video" tag. Some older browsers (such as Firefox 3) that support the video-tag but do not support either the MP4 or the WebM video codec may show an error. In that case, please go to our youtube channel to watch the screen casts.
--- Update 2013-07-24
Since Firefox 21, MP4 is supported on Firefox if you're on Windows 7 or higher. There may be problems with colors that are resolved if you go to about:config and set
media.windows-media-foundation.use-dxva=false