Yeah, I actually tried using aset as well, and was still seeing these "rogue" threads taking much longer (although the ones that did finish in a normal amount of time had very similar completion times to those running in their own process.)
Herwig: I will try those suggestions when I get a chance. On Thu, Nov 19, 2015 at 6:19 PM, Fluid Dynamics <a2093...@trbvm.com> wrote: > On Thursday, November 19, 2015 at 1:36:59 AM UTC-5, David Iba wrote: >> >> OK, have a few updates to report: >> >> - Oracle vs OpenJDK did not make a difference >> - Whenever I run N>1 threads calling any of these functions with >> swap/vswap, there is some overhead compared to running 18 separate >> single-run processes in parallel. This overhead seems to increase as N >> increases. >> - For both swap and vswap, the function timings from running 18 >> futures (from one JVM) show about 1.5X the time from running 18 >> separate >> JVM processes. >> - For the swap version (f2), very often a few of the calls would >> go rogue and take around 3X the time of the others. >> - this did not happen for the vswap version of f2. >> - Running 9 processes with 2 f2-calling threads each was maybe 4% >> slower than 18 processes of 1. >> - Running 4 processes with 4 f2-calling threads each was mostly the >> same speed as the 18x1, but there were a couple of those rogue threads >> that >> took 2-3X the time of the others. >> >> Any ideas? >> > > Try a one-element array and aset, and see if that's faster than atom/swap > and volatile/vswap. The latter two have memory barriers, the former does > not, so if it's flushing the CPU cache that's the key here, aset should be > faster, but if it's something else, it will probably be the same speed. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "Clojure" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/clojure/W-sddnit69Q/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
