hkaiser changed the topic of #ste||ar to: STE||AR: Systems Technology, Emergent Parallelism, and Algorithm Research | stellar.cct.lsu.edu | HPX: A cure for performance impaired parallel applications | github.com/STEllAR-GROUP/hpx | Buildbot: http://rostam.cct.lsu.edu/ | Log: http://irclog.cct.lsu.edu/ | GSoD: https://developers.google.com/season-of-docs/
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<weilewei> Anyone sees this question about hpx on stackoverflow before: https://stackoverflow.com/questions/55259243/performance-of-mpi-parcelport-in-hpx
<weilewei> The person in the lab found this question interesting and asked me about it
<weilewei> They are not the same person (the person in the lab and the person asked question on stackoverflow)
<heller> weilewei: no, haven't seen this question before
<heller> weilewei: a few remarks: 1) We have our own tests of this form (osu_latency and osu_bandwidth). 2) the high variation is caused by the action performing no real work (a direct action would have been better in that case 3) a single ping/pong has higher latency than what you'd expect, these values get better once you overlap multiple actions 4) The libfabric parcelport is able to deliver way better performance
<weilewei> heller thanks for the notes, for your point 3), what's the reason of causing higher latency? why overlapping actions can relief the pain?
<heller> asynchronous operations always cause higher latencies. It
<heller> and those latencies are only mitigated when having multiple of those asynchronous operations happening simultanouelsy
<weilewei> heller ok, so it is not stable with one single async operation
<heller> This has nothing to do with the performance being stable
<heller> A regular action spawns a new task, a direct action doesn't
<heller> That's where the fluctuations come from
<heller> Another point here is the parcel coalescing
<heller> Which increases throughput at the cost of latency
<weilewei> ok
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<nikunj> new day, new trials :)
<nikunj> let's see if I can build phylanx finally today
<zao> The eternal struggle.
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<zao> /root/stellar/phylanx/phylanx/execution_tree/compiler/actors.hpp:426:13: error: field 'func_name_' will be initialized after field 'name_' [-Werror,-Wreorder]
<zao> You people have amusing -Werror choices :D
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<zao> "why is this build so slow and barely uses any cpu?" -j1...
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<zao> I don't know of course what magical knobs to pass to HPX, but phylanx seems to have some trouble out of the box :)
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