sugarBenchmarks.R

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#!/usr/bin/env r
 
suppressMessages(library(inline))
suppressMessages(library(Rcpp))
 
benchmark <- function(start = settings$start, 
                      hand.written = settings$hand.written, 
                      sugar = settings$sugar, 
                      expr = settings$expr, 
                      runs = settings$runs,
                      data = settings$data,
                      end = settings$end, 
                      inc = settings$inc, 
                      
                      settings = list( 
                                start = "", hand.written = "", 
                                sugar = "", expr = NULL, 
                                runs = 500, 
                                data = NULL , 
                                end = "", 
                                inc = ""
                                )
                      ) {
 
expr <- force(expr)
inc  <- force( inc )
 
src <- sprintf( '
    unsigned int runs = as<int>(runss);
        Environment e(env) ;
 
        %s
 
    Timer timer;
 
    // approach one
    timer.Start();
    for (unsigned int i=0; i<runs; i++) {
           %s
    }
    timer.Stop();
    double t1 = timer.ElapsedTime();
 
    // approach two
    timer.Reset(); timer.Start();
    for (unsigned int i=0; i<runs; i++) {
        %s
    }
    timer.Stop();
    double t2 = timer.ElapsedTime();
 
    Language call(expr) ;
 
    timer.Reset(); timer.Start();
    for (unsigned int i=0; i<runs; i++) {
        NumericVector res2 = Rcpp_fast_eval( call, e ) ;
    }
    timer.Stop();
    double t3 = timer.ElapsedTime();
 
    %s
 
    return NumericVector::create(
        _["hand written"] = t1,
        _["sugar"] = t2,
        _["R"]     = t3
        ) ;
',
               paste( start, collapse = "\n" ) ,
               paste( hand.written, collapse = "\n" ),
               paste( sugar, collapse = "\n" ),
               paste( end, collapse = "\n" )
        )
 
        e <- environment()
        for( i in names(data) ){
                assign( i, data[[i]], envir = e )
        }
 
        settings <- getPlugin("Rcpp")
        settings$env$PKG_CXXFLAGS <- paste("-I", getwd(), sep="")
 
        fun <- cxxfunction(signature(runss="integer", expr = "language", env = "environment" ),
                           src,
                           includes= sprintf( '#include "Timer.h"\n%s', paste( inc, collapse = "\n" ) ),
                           plugin="Rcpp",
                           settings=settings)
        results <- fun(runs, expr, environment() )
        cat( "-" )
        list( results = results, runs = runs, expr = deparse(expr) )
}
 
settings.ifelse <- list( start = '
        NumericVector x = e["x"] ;
        NumericVector y = e["y"] ;
', hand.written = '
        int n = x.size() ;
        NumericVector res1( n ) ;
        double x_ = 0.0 ;
        double y_ = 0.0 ;
        for( int i=0; i<n; i++){
        x_ = x[i] ;
        y_ = y[i] ;
        if( R_IsNA(x_) || R_IsNA(y_) ){
            res1[i] = NA_REAL;
        } else if( x_ < y_ ){
            res1[i] = x_ * x_ ;
        } else {
            res1[i] = -( y_ * y_)  ;
        }
    }
 
', sugar = '
    NumericVector res2 = ifelse( x < y, x*x, -(y*y) ) ;
', expr = quote(ifelse(x<y, x*x, -(y*y) )), 
   data = list( x = runif(1e5),  y = runif(1e5) )
)
 
settings.ifelse.nona <- list( start = '
        NumericVector x = e["x"] ;
        NumericVector y = e["y"] ;
', hand.written = '
        int n = x.size() ;
        NumericVector res1( n ) ;
        double x_ = 0.0 ;
        double y_ = 0.0 ;
        for( int i=0; i<n; i++){
        x_ = x[i] ;
        y_ = y[i] ;
        if( x_ < y_ ){
            res1[i] = x_ * x_ ;
        } else {
            res1[i] = -( y_ * y_)  ;
        }
    }
 
', sugar = '
    NumericVector res2 = ifelse( x < y, noNA(x)*noNA(x), -(noNA(y)*noNA(y)) ) ;
', expr = quote(ifelse(x<y, x*x, -(y*y) )), 
   data = list( x = runif(1e5),  y = runif(1e5) )
)
 
settings.sapply <- list( start =  '
        NumericVector x = e["x"] ;
        int n = x.size() ;
 
', hand.written = '
        NumericVector res1( n ) ;
        std::transform( x.begin(), x.end(), res1.begin(), square ) ;
 
', sugar = '
        NumericVector res2 = sapply( x, square ) ; 
',
        expr = quote(sapply(x,square)),
        runs = 500,
        data = list(
                x = rnorm(1e5) ,
                square = function(x) x*x
        ), 
        inc = '
        inline double square(double x){ return x*x ; }
        '
)
 
settings.any <- list( start = '
        NumericVector x = e["x"] ;
        NumericVector y = e["y"] ;
        int res ;
        SEXP res2 ;
 
', hand.written = '
        int n = x.size() ;
        bool seen_na = false ;
        bool result = false ;
        double x_ = 0.0 ;
        double y_ = 0.0 ;
        for( int i=0; i<n; i++){
                x_ = x[i] ;
                if( R_IsNA( x_ )  ){
                        seen_na = true ;
                } else {
                        y_ = y[i] ;
                        if( R_IsNA( y_ ) ){
                                seen_na = true ;
                        } else {
                                /* both non NA */
                                if( x_*y_ < 0.0 ){
                                        result = true ;
                                        break ;
                                }
                        }
                }
        }
        res = result ? TRUE : ( seen_na ? NA_LOGICAL : FALSE ) ;
', sugar = '
        res2 = any( x*y < 0 ) ;
',
        expr = quote(any(x*y<0)),
        runs = 5000,
        data = list(
                x = seq( -1, 1, length = 1e05),
                y = rep( 1, 1e05)
        )
)
raw.results <- list( 
        benchmark( settings = settings.any   , runs = 5000 ), 
        benchmark( settings = settings.ifelse, runs = 500 ), 
        benchmark( settings = settings.ifelse.nona, runs = 500 ), 
        benchmark( settings = settings.sapply, runs = 500 )
)
cat("\n")
 
results <- do.call( rbind, lapply( raw.results, "[[", "results" ) )
results <- data.frame( 
        runs = sapply( raw.results, "[[", "runs" ),
        expr = sapply( raw.results, "[[", "expr" ),
        as.data.frame( results, stringsAsFactors = FALSE )
        )
 
results[[ "hand/sugar" ]] <- results[["hand.written" ]] / results[["sugar"]] 
results[[ "R/sugar" ]]    <- results[["R" ]]            / results[["sugar"]] 
# results <- results[ order( results[["expr"]], results[["runs"]] ), ]
 
options( width = 300 )
print( results )