Vivek Thakkar wrote:
Hello,
I have two openmp/posix threads and I want to get the PEBS traces for each
thread (configured event is L1 load miss). Is it possible with perfmon
? And if yes then what is the way to configure perfmon for this ? I have
NPTL on my system. ( Only one process id for each thread as opposed to the
older
LinuxThreads where 1 pid = 1 thread id model was used)
Can we get different DS areas for each thread and thus different overflow
notifications ?
Thanks And Regards,
Vivek Thakkar
MS, CSC deptt. NC State University
Regards,
Vivek
This is the same problem that Jesse encountered when thinking about
restructuring his tool for his master's thesis. The tool currently has a
separate process watching the instrumented process, but he was considering
moving it to a thread to watch the other thread to eliminate the need for shared
memory between the processes. The problem was how to create the context and read
the data in that situation.
It seems that this situation of one thread monitoring other threads is going to
come up repeatedly. Another example application would be a JVM that has a thread
monitoring the other threads to determine which methods need further optimization.
It seems like the logical thing would be to have the perfmon2 information kept
on a per thread basis like the processor registers.
-Will
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