Thanks for sharing this, will check it out if I get a chance. Do you have a http git url that I can clone? I'm behind a firewall. On Mon, Oct 14, 2013 at 12:05 PM, Raphaël Beamonte <raphael.beamonte@xxxxxxxxx> wrote: > Hi all ! > > I just released the Non-Preempt Test (npt) version 1.01 which is > available here: http://git.dorsal.polymtl.ca/?p=npt.git > > The purpose of this tool is to simulate a small real-time system that > runs with a high priority without being stopped or preempted. To do so, > it first sets its environment (cpu affinity, RT scheduler, memory locked > into RAM with mlockall) and can optionally disable the local IRQs if > compiled with the right options (not defined by default). > > The core of the application is a loop that calculates the time gap > between the start of two consecutive loops using the rdtsc asm > instruction, thus a similarity with the hwlat_detector kernel module for > kernel analysis. At the end of its execution, npt computes latencies > statistics for each loop and generates a histogram showing the different > latencies reached and the number of time it reached each one. > > This tool can be used to analyse and identify overhead of different > realtime applications as we can compare the latencies in each loops and > thus identify the added latency from a "blank" run. It is released > LTTng-ready and can thus be easily traced. Next versions could include > other userspace tracers ability. > > Feedback, collaborations and contributions are welcome! > > Regards, > Raphaël Beamonte > -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
