wspy – added topdown memory analysis
As a followup to a previous post, I’ve added support to wspy for topdown analysis for backend stalls.
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wspy – process tracing, lost nodes and potential refactoring
One of the tough bugs I’ve noticed sometimes pop up is an “orphaned” process tree in my tree. When I’ve collected trees of processes, very occasionally I’ll have a tree node drop on the floor and show up as an … Continue reading →
wspy – added csv file as well as analysis functions
I have updated wspy to dump a “processtable.csv” file at the same time it dumps a “processtable.txt” file. This gives me several advantages: I’ve separated the format of output from collecting instrumentation. Hence, I can run things once to collect … Continue reading →
Top down performance counter analysis (part 3) – wspy
As described in top down performance counter analysis part 1, top down analysis is an approach that uses key performance counters to characterize an application and then successively drills down with further refinement. On Intel x86 processors, this first level … Continue reading →
Top down performance counter analysis (part 2) – wspy
As described in top down performance counter analysis part 1, top down analysis is an approach that uses key performance counters to characterize an application and then successively drills down with further refinement. On Intel x86 processors, this first level … Continue reading →
wspy – a workload spy
wspy is both a code base and a tool for performance analysis. As a code base, I modify wspy to run particular experiments and measurements. This lets me experiment trying particular techniques and interfaces to create a quick and dirty … Continue reading →
wspy – added on_cpu and on_core metrics
wspy is now enhanced to provide two new metrics, for a particular process tree: on_cpu – what percentage of the total time are all the cores scheduled to run in either user or system time? on_core – what percentage of … Continue reading →
trace-cmd and kernelshark
Found a new tool for creating and browsing kernel ftrace events.
Continue reading →wspy – followup: support for ptrace as well as ftrace
As a followup to my post about ptrace vs ftrace I have added a basic ptrace support to wspy.
Continue reading →wspy – instrumentation: ftrace and ptrace
While the names sound different, ptrace and ftrace are two rather different methods of implementing process instrumentation.
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