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Updated Profiling using XRay (markdown)

Daniel Krebs 2016-06-17 15:11:04 +02:00
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Profiling-using-XRay.md

@ -85,3 +85,21 @@ Here you can do further filtering of the output. For a function call to be added
# Example
See [hermit/usr/openmpbench/syncbench.c](https://github.com/RWTH-OS/HermitCore/blob/dae722ea8cab9d14ba3e8e4700310b5dcf20d8ef/hermit/usr/openmpbench/syncbench.c).
# Analysation
After tracing your code, you may want to analyse the report. While the XRay report is already human-readable, it's hard to get an overview of the whole trace. Therefore, it's possible to convert the XRay report to a format that [kCacheGrind](https://kcachegrind.github.io) can read. You can find the tool needed for conversion at `/hermit/usr/xray/tools`.
```bash
$ ./conv2kcg.py libgomp_trace.xray
INFO:Parsing Header is done. Found 1 frames
INFO:Found frame 'PARALLEL' data
INFO:Frame 'PARALLEL' complete
INFO:Report file 'libgomp_trace.xray' parsed completely.
INFO:Create callgrind file for frame 'PARALLEL'
INFO:Writing to: libgomp_trace_PARALLEL.callgrind
```
This will create the file `libgomp_trace_PARALLEL.callgrind` which can be opened using kCacheGrind (Open dialog: set Filter to 'All Files') and may look like this:
[[images/kcachegrind_screenshot.png]]