Message-ID: <20055.50264.401883.140033@max.nulle.part>
Date: 2011-08-26T16:05:44Z
From: Dirk Eddelbuettel
Subject: [Rcpp-devel] New self-contained OpenMP example (Was: Stack imbalance warning when using Rcpp and OpenMP)
In-Reply-To: <201108260837.52790.cubranic@stat.ubc.ca>
That's what I get with Davor's additions:
edd at max:~/svn/rcpp/pkg/Rcpp/inst/examples/OpenMP$ r OpenMPandInline.r
Loading required package: methods
test replications elapsed relative user.self sys.self
2 funOpenMP(z) 100 3.996 1.000000 30.53 0.91
5 funSerialRcpp(z) 100 8.960 2.242242 8.57 0.39
3 funSerialStdAlgRcpp(z) 100 8.975 2.245996 9.39 0.34
6 funSugarRcpp(z) 100 9.225 2.308559 9.00 0.22
4 funSerialStdAlg(z) 100 10.003 2.503253 9.22 0.77
1 funSerial(z) 100 10.092 2.525526 9.42 0.67
edd at max:~/svn/rcpp/pkg/Rcpp/inst/examples/OpenMP$
OpenMP still wins in 'elapsed' and using the STL algorithm is good for
marginal gains over manual loops.
Dirk
--
Two new Rcpp master classes for R and C++ integration scheduled for
New York (Sep 24) and San Francisco (Oct 8), more details are at
http://dirk.eddelbuettel.com/blog/2011/08/04#rcpp_classes_2011-09_and_2011-10
http://www.revolutionanalytics.com/products/training/public/rcpp-master-class.php