Notice: this Wiki will be going read only early in 2024 and edits will no longer be possible. Please see: https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/wikis/Wiki-shutdown-plan for the plan.
Trace Compass/News/NewIn20
Contents
- 1 Pie charts in Statistics view
- 2 Gridlines in Time Graph views
- 3 System call latency analysis
- 4 Critical flow view
- 5 Virtual CPU view
- 6 Bookmarks and custom markers
- 7 Display of soft IRQ names in the Resources view
- 8 Support of vertical zooming in time graph views
- 9 Visualization of debug info for source code lookup coming with LTTng 2.8 traces
- 10 Bugs fixed in this release
Pie charts in Statistics view
Pie Charts have been added to the Statistics view.
Gridlines in Time Graph views
Grid lines have been added to the time graph views such as the Control Flow view.
System call latency analysis
For analyzing of analyzing system call latencies in the Linux Kernel using LTTng kernel traces, the System Call Latency Analysis has been added. Various views will now display the results of the analysis in different ways.
System call latency table
The System Call Latency table lists all latencies occurred per system call type occurred within the currently open trace.
System call latency scatter graph
The System Call Latency vs Time view visualizes system call latencies in the Linux Kernel over time.
System call latency statistics
The System Call Latency Statistics view shows statistics about system call latencies. I lists the minimum, maximum and average latency as well as the standard deviation for a given system call type.
System call latency density
The System Call Density view shows the distribution of the latencies for the current selected time window of the traces.
Critical flow view
A critical flow analysis and view has been added to show dependency chains for a given process.
Virtual CPU view
To better understand what is happening in such a virtual environment, it is necessary to trace all the machines involved, guests and hosts, and correlate this information in an experiment that will display a complete view of the virtualized environment. The Virtual CPU view has been added for that.
In order to be able to correlate data from the guests and hosts traces, each hypervisor supported by Trace Compass requires some specific events, that are sometimes not available in the default installation of the tracer. For QEMU/KVM special LTTng kernel modules exist which need to be installed on the traced system. For more information, please follow the instructions in the Trace Compass user guide.
Bookmarks and custom markers
Support for user bookmarks in time graph views
It is now possible to create bookmarks in time graph view for a single or time range selection. This will allow users to annotate their traces and easily navigate to region of interests.
Lost event markers in time graph views
Time graph views such as Control Flow or Resources view now highlight the durations where lost lost events occurred. .
It is possible to navigate from one marker forward and backwards in time graph views as well as it's possible to configure which marker type to include for the navigation. It is also possible to hide markers of a given type from the view menu.
API for trace specific markers
A new API is provided to define programmatically trace specific markers. This can be used, for example, to visualize time periods in the time graph views.
Display of soft IRQ names in the Resources view
The Resources view now displays the soft IRQ names together with the Soft IRQ numbers.
Support of vertical zooming in time graph views
It is now possible to zoom vertically in all time graph views, for example Control Flow view or Resources view, using the key combination Ctrl+'+' or Ctrl+'-' or using the mouse with Shift+Ctrl+mouse wheel. The key combination Ctrl+'0' resets the vertical zoom to the default.
Visualization of debug info for source code lookup coming with LTTng 2.8 traces
Bugs fixed in this release
See Bugzilla report Bugs Fixed in Trace Compass 2.0