an idea how to get more out of latency measurements:
when nailing down latency issues, often there's a correlation between observed latency, and some other command being run in parallel [1] the current latency-test doesnt help much except for 'reset statistics, observe again, take sceenshot' what would really help is a rolling history display, like in a spectrum analyzer waterfall [2], and a way to tag it with timestamps correlating to command execution. this would mean a 2D plot, scrolling up with time (Y=time) on the X axis you'd have horizontal colored bars, like for min/avg/max latency in green/yellow/red ideally one would be able to tag a line with some shell command, maybe just a text mark. I'm out of my depth how to do this, but I think it'd be a great help to visualize and communicate obvserved behavior - Michael ------ [1] yesterday we had a long 'track down these latency spikes' session on IRC; log is here: http://linuxcnc.mah.priv.at/irc/%23linuxcnc-devel/2013-02-11.html#16:43:23 if we had had such a tool, the impact could have been show by a screenshot [2] example for a live spectrum waterfall: http://websdr.ewi.utwente.nl:8901/ (read here before: http://sdrrocks.blogspot.co.at/2008/04/web-based-sdr.html; stunning tool btw!) ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
