Have the results of this been integrated in the interpreter?
On 1 August 2014 21:57, Juergen Sauermann <juergen.sauerm...@t-online.de> wrote: > Hi Elias, > > yes - actually a lot. I haven't looked through all files, but > at 80, 60, and small core counts. > > The good news is that all results look plausible now. There are some > variations > in the data, of course, but the trend is clear: > > The total time for OMP (the rightmost value in the plot, i.e. x == > corecount + 10) is consistently > about twice the total time for a hand-crafted fork/sync. The benchmark was > made in such way > that it only shows the fork/join times. Column N ≤ corecount shows the > time when the N'th core > started execution of its task. > > I have attached a plot for the 80 core result (4 hand-crafted runs in red > and 4 OMP runs in green). > And the script that created the plots using gnuplot. > > /// Jürgen > > > > On 08/01/2014 03:16 PM, Elias Mårtenson wrote: > > Were you able to deduce anything from the test results? > On 11 May 2014 23:02, "Juergen Sauermann" <juergen.sauerm...@t-online.de> > wrote: > >> Hi Elias, >> >> thanks, already interesting. If you could loop around the core count: >> >> *for ((i=1; $i<=80; ++i)); do* >> * ./Parallel $i* >> * ./Parallel_OMP $i* >> *done* >> >> then I could understand the data better. Also not sure if something >> is wrong with the benchmark program. On my new 4-core with OMP I get >> fluctuations from: >> >> eedjsa@server65 ~/apl-1.3/tools $ ./Parallel_OMP 4 >> Pass 0: 4 cores/threads, 8229949 cycles total >> Pass 1: 4 cores/threads, 8262 cycles total >> Pass 2: 4 cores/threads, 4035 cycles total >> Pass 3: 4 cores/threads, 4126 cycles total >> Pass 4: 4 cores/threads, 4179 cycles total >> >> to: >> >> eedjsa@server65 ~/apl-1.3/tools $ ./Parallel_OMP 4 >> Pass 0: 4 cores/threads, 11368032 cycles total >> Pass 1: 4 cores/threads, 4042228 cycles total >> Pass 2: 4 cores/threads, 7251419 cycles total >> Pass 3: 4 cores/threads, 3846 cycles total >> Pass 4: 4 cores/threads, 2725 cycles total >> >> The fluctuations with the manual parallel for are smaller: >> >> Pass 0: 4 cores/threads, 87225 cycles total >> Pass 1: 4 cores/threads, 245046 cycles total >> Pass 2: 4 cores/threads, 84632 cycles total >> Pass 3: 4 cores/threads, 63619 cycles total >> Pass 4: 4 cores/threads, 93437 cycles total >> >> but still considerable. The picture so far suggests that OMP fluctuates >> much >> more (in the start-up + sync time) than manual with the highest OMP >> start-up above manual >> and the lowest far below. One change on my TODO list is to use futexes >> instead of mutexes >> (like OMP does), probably not an issue under Solaris sunce futextes are >> linux-specific. >> >> /// Jürgen >> >> >> On 05/11/2014 04:23 AM, Elias Mårtenson wrote: >> >> Here are the files that I promised earlier. >> >> Regards, >> Elias >> >> >> >
