Hi Saurav, I'd also be happy to hear more about HdrHistogram. It seems to me that the main feature is the HDR-ness. This means roughly the same as having exponentially spaced bins in the histogram?
More generally, if HdrHistogram offers compelling features over the one we already have, it is definitely a useful addition. Concurrency is in any case a must. If you haven't already seen the "More Arithmetic Performance Counters" and "Augment CSV Files" projects have a look at them as parts of those can (more likely should) be combined into one project. "More Arithmetic Performance Counters" has already been done by Hartmut in PR 2745, but more operations could potentially be useful (log, exp?). If you'd like to do more data analysis you should look at "Augment CSV Files". You could mix and match parts of these into a nice package. Looking at the histogram implementation that Hartmut linked is a good place to start, as is the rest of the performance counter framework. That should give you a better idea of what we already have and what we might be lacking. Hop onto IRC (#ste||ar on freenode) if you have more detailed questions! Kind regards, Mikael ________________________________________ From: hpx-users-boun...@stellar.cct.lsu.edu [hpx-users-boun...@stellar.cct.lsu.edu] on behalf of Hartmut Kaiser [hartmut.kai...@gmail.com] Sent: Monday, February 19, 2018 10:57 PM To: hpx-users@stellar.cct.lsu.edu; 'Saurav Sachidanand' Subject: Re: [hpx-users] [GSoC 2018] Histogram Performance Counter Hey Saurav, > My name is Saurav Sachidanand and I wish to participate in GSoC 2018. > I'm intrigued with the Histogram Performance Counter project. I've > previously worked with HdrHistorgram [1], which is a histogram > implementation that can record integer and float values with high range > and precission, with fixed space and time costs. Implementations in > several languages exist, but not in C++. The reference Java version [2] > provides several more features, including a concurrent version of the > histogram. Would implementing a generic C++ concurrent HdrHistgram > perforamance counter, supporting all features from the Java version and > utilizing HPX's APIs, be a useful addition? > > This idea came to mind beacuse I participated in GSoC last year [3], where > I built a Performance Co-Pilot instrumentation library in Rust, and I had > to integrate HdrHistogram into the API [4]. > > Any guidance and feedback will be greatly appreciated. I don't know anything about the HdrHistgram you're referring to. Would you care to elaborate? We have a histogram implementation in HPX (https://github.com/STEllAR-GROUP/hpx/blob/master/hpx/util/histogram.hpp) which is currently used for a special performance counter in the parcel (message) coalescing layer. But this does not have to be used for a general purpose counter. Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu > > Thanks, > Saurav > > [1] - https://hdrhistogram.github.io/HdrHistogram/ > [2] - https://github.com/HdrHistogram/HdrHistogram > [3] - > https://summerofcode.withgoogle.com/archive/2017/projects/479329678209843 > 2/ > [4] - https://github.com/performancecopilot/hornet#histogram _______________________________________________ hpx-users mailing list hpx-users@stellar.cct.lsu.edu https://mail.cct.lsu.edu/mailman/listinfo/hpx-users _______________________________________________ hpx-users mailing list hpx-users@stellar.cct.lsu.edu https://mail.cct.lsu.edu/mailman/listinfo/hpx-users
