[Lilit summer student development] Flamegraph integration

[oshadura]

@eguiraud I tried but I am confused why it works from the terminal but doesn't generate anything in ctest...

From rootbench build directory:

 export PATH=$PWD/FlameGraph-prefix/src/FlameGraph/:$PATH
./tools/flamegraph.sh -d . -b root/tmva/tmva/ConvNetCpuBenchmarks -c -m 
.......
----------------------------------------------------------------------
Benchmark                            Time             CPU   Iterations
----------------------------------------------------------------------
BM_ConvolutionalNetwork_CPU 39306567750 ns   38953830955 ns            1
[ perf record: Woken up 12 times to write data ]
[ perf record: Captured and wrote 3,832 MB perf.data (381 samples) ]

and both pngs (memory and CPU flamegraphs) are beautifully generated!

But from ctest:

ctest -R rootbench-fixture-flamegraphcpu-ConvNetCpuBenchmarks
......
69: [ perf record: Woken up 4 times to write data ]
69: [ perf record: Captured and wrote 0,000 MB (null) ]
69: failed to open perf.data: No such file or directory  (try 'perf record' first)
69: ERROR: No stack counts found
1/1 Test #69: rootbench-fixture-flamegraph-ConvNetCpuBenchmarks ...***Failed  119.84 sec

0% tests passed, 1 tests failed out of 1

Total Test time (real) = 119.89 sec

The following tests FAILED:
	 69 - rootbench-fixture-flamegraph-ConvNetCpuBenchmarks (Failed)
Errors while running CTest

The command is the same for both and I see the benchmark is running actually...

[oshadura]

Rebased and readapted from #94

[eguiraud]

@oshadura I bet it's a "current working directory" issue. You can check the verbose ctest -V -R rootbench-fixture-flamegraphcpu-ConvNetCpuBenchmarks and also check, after the test failed, in which directory the perf.data file has been created.

[vgvassilev]

Looks like the behavior of perf record is different if being called from ctest. Let's aim for merging the script and then the rest.