an example of parallel calculation of metrics
Jay Norwood via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Thu Oct 1 13:20:38 PDT 2015
So, this is a condensed version of the original problem. It looks
like the problem is that the return value for taskPool.amap can't
be a tuple of tuples or a tuple of struct. Either way, it fails
with the Wrong buffer type error message if I uncomment the
taskPool line
import std.algorithm, std.parallelism, std.range;
import std.typecons;
import std.meta;
import std.stdio;
// define some input measurement sample tuples and output metric
tuples
struct TR { long raw; double per_cyc;}
//alias TR = Tuple!(long, "raw", double, "per_cyc");
alias TI = Tuple!(long, "L1I_MISS",long, "L1D_MISS", long,
"L1D_READ", long, "L1D_WRITE", long, "cycles" );
alias TO = Tuple!(TR, "L1_MISS", TR, "L1D_ACCESS");
// various metric definitions
// using Tuples with defined names for each member, and use the
names here in the metrics.
TR met_l1_miss ( ref TI m){ TR rv; rv.raw =
m.L1I_MISS+m.L1D_MISS; rv.per_cyc = cast(double)rv.raw/m.cycles;
return rv; }
TR met_l1_access ( ref TI m){ TR rv; rv.raw =
m.L1D_READ+m.L1D_WRITE; rv.per_cyc =
cast(double)rv.raw/m.cycles; return rv; }
// a convenience to use all the metrics above as a list
alias Metrics = AliasSeq!(met_l1_miss, met_l1_access);
void main(string[] argv)
{
auto samples = iota(100);
auto meas = new TI[samples.length];
auto results = new TO[samples.length];
// Initialize some values for the measured samples
foreach(i, ref m; meas){
m.L1D_MISS= 100+i; m.L1I_MISS=100-i;
m.L1D_READ= 200+i; m.L1D_WRITE=200-i;
m.cycles= 10+i;
}
ref TI getTerm(int i)
{
return meas[i];
}
// compute the metric results for the above measured sample
values in parallel
//taskPool.amap!(Metrics)(std.algorithm.map!getTerm(samples),results);
TR rv1 = met_l1_miss( meas[1]);
TR rv2 = met_l1_access( meas[1]);
writeln("measurements:", meas[1]);
writeln("rv1:", rv1);
writeln("rv2:", rv2);
writeln("results:", results[1]);
}
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