Perhaps separate OS processes would be a win in this case? On Tue, Feb 25, 2020 at 12:03 PM Matthew Butterick <[email protected]> wrote:
> > > On Feb 25, 2020, at 7:05 AM, Matthew Flatt <[email protected]> wrote: > > > > * CS has a single heap with a single-threaded, stop-the-world GC --- > > so allocation and GC easily become a bottleneck. > > > > If GHC's experience is any guide, making the GC itself multithreaded > > may address much of this problem. > > > > Locks on shared system data structures may also be a significant > > obstacle to CPU utilization with places in CS, but I'm not sure. > > > > FWIW some quick timings on a Pollen render of practicaltypography.com. > Though extra cores have diminishing net returns under Racket BC, the > returns are still positive. Under Racket CS, by contrast, net performance > degrades with more than 4 cores. > > Racket BC > > single core > real 4m21.191s > user 3m37.940s > sys 0m42.388s > > parallel @ 2 cores > real 2m46.235s > user 4m22.160s > sys 0m56.270s > > parallel @ 3 cores > real 1m54.134s > user 4m10.330s > sys 0m54.533s > > parallel @ 4 cores > real 1m43.055s > user 4m46.933s > sys 1m5.948s > > parallel @ 6 cores > real 1m34.783s > user 6m8.522s > sys 1m32.125s > > parallel @ 8 cores > real 1m18.137s > user 6m24.778s > sys 1m38.617s > > parallel @ 12 cores > real 1m14.924s > user 8m30.239s > sys 2m14.671s > > Racket CS > > single core > real 5m1.422s > user 4m16.300s > sys 0m44.253s > > parallel @ 2 cores > real 3m25.016s > user 4m45.385s > sys 0m54.634s > > parallel @ 3 cores > real 2m52.780s > user 4m57.951s > sys 1m3.184s > > parallel @ 4 cores > real 2m42.471s > user 5m22.796s > sys 1m17.889s > > parallel @ 6 cores > real 2m44.513s > user 6m26.700s > sys 1m54.549s > > parallel @ 8 cores > real 2m56.782s > user 8m4.029s > sys 2m58.554s > > parallel @ 12 cores > real 3m2.116s > user 9m34.846s > sys 5m5.443s > > > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/racket-users/3D11BBCF-B0FE-473B-8997-09B7CB60D761%40mbtype.com > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAD2gp_S_kzyXFLCet_u8dHMCk_Wpgf-iS22Z7Az-oCNBXoEm5g%40mail.gmail.com.
