# Response Time#

In context of CARET, response time is defined how much of time costs from a message input to message output from a targeted path. Please refer to FAQ if you are interested in response time defined in CARET.

Three cases of response time is defined CARET; best-to-worst, best, and worst. With best case, CARET samples shortest time elapsed in a targeted path. With worst case, the previous message input timing is taken into account. best-to-worst case includes most of all cases between best and worst. This section shows three sample scripts for response time. They generate histograms respectively. Horizontal axis of the histograms means response time, labeled Response Time [ms] and vertical axis of the histograms means Probability.

from caret_analyze.plot import Plot
from caret_analyze import Application, Architecture, Lttng
from bokeh.plotting import output_notebook, figure, show
output_notebook()

arch = Architecture('yaml', '/path/to/architecture_file')
lttng = Lttng('/path/to/trace_data')
app = Application(arch, lttng)
path = app.get_path('target_path')

# plot best-to-worst case
plot = Plot.create_response_time_histogram_plot(path)
plot.show()


Info

The output_notebook() is needed to show figures inside Jupyter Notebook.

# plot best case
plot = Plot.create_response_time_histogram_plot(path, case='best')
plot.show()


# plot worst case
plot = Plot.create_response_time_histogram_plot(path, case='worst')
plot.show()