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Announcing the release of LTTng 2.11

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Fountain

We're happy to announce the release of LTTng 2.11 "Lafontaine".

This is a combined release announcement for the 2.11.0 - "Lafontaine" release of the LTTng Tools, LTTng UST, and LTTng modules projects.

This release is named after a modern Saison beer from Montréal's Oshlag microbrewery. It is a refreshing, zesty, rice beer with hints of fruit and spices. Some even say it makes for a great Somaek when mixed with Chamisul Soju, not that we've tried!

Lafontaine is also a tongue-in-cheek reference to a water leak that affected EfficiOS's offices during the development of this release.

The most notable features of this new release are:

  • Session rotation,
  • Dynamic tracing of user-space (LTTng-modules),
  • Support for arrays and bitwise binary operators in filters,
  • User and kernel space call stack capture from the LTTng-modules kernel tracer (LTTng-modules),
  • Improved networking performance of the relay daemon,
  • Take NUMA configuration into account for UST buffer allocation (LTTng-UST),
  • Support unloading of probe providers (dlclose) (LTTng-UST).

The new dynamic user space tracing feature in LTTng

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DTRACE_PROBE code

LTTng’s upcoming 2.11 release brings several exciting new features, including session rotation and user and kernel space call stack capture. This post takes a look at another new feature that's currently available in the 2.11 RC releases: dynamic user space tracing. This feature allows you to instrument functions in user space apps and shared libraries at run time by adding and removing user space probes.

LTTng session rotation: the practical way to do continuous tracing

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Rotating engine

Many LTTng users want to inspect traces while their tracing session continues to run in the background, but that's only possible with tools that support the "live" protocol. Historically, it has not been possible to process traces "offline". To be able to read, modify, or delete a trace file, you need to interrupt the tracing session. When you're investigating long-lived issues that can take days to track down, stopping the session to see whether the bug has triggered opens a window where you might miss it. And leaving the session running can result in huge traces that can take days to process.

Bringing .NET application performance analysis to Linux

Microscopic analysis photo

Both the Windows and Linux ecosystems have a swath of battle-hardened performance analysis and investigation tools. But up until recently, developers and platform engineers could use none of these tools with .NET applications on Linux.

Getting them to work with .NET involved collaboration across many open source communities. The .NET team at Microsoft and the LTTng community worked together to bring .NET application performance analysis to Linux. Since one of this project's goals was to avoid reinventing the wheel—and to allow existing workflows to be used for .NET applications on Linux—the .NET team chose to enable usage of popular Linux tools such as LTTng and perf to enable performance analysis of .NET core applications.