SAP HANA R Integration Guide

5.3 Measuring Performance in R
R provides some basic profiling functions to keep track of performance and memory consumption. If you plan
to profile the R application (or use profiling functions like tracemem()), R has to be configured with the
following command:
--enable-memory-profiling
●
●
●
●
●
system.time() can be used to measure the total evaluation time for a given R expression.
Set gcFirst=TRUE for garbage collection.
replicate() can be used to average over invocations.
identical() and all.equal() can be used to ensure that optimizations produce correct results.
Rprof() can be used to profile multiple function calls and their execution time.
tracemem() can be used to profile the memory consumption of the R environment.
5.4 Profiling R Procedures with Rprof
You can use the R function Rprof() to profile your R procedure.
DROP TABLE "Rprof";
CREATE COLUMN TABLE "Rprof"("function" VARCHAR(5000), "total.time" DOUBLE,
"total.pct" DOUBLE, "self.time" DOUBLE, "self.pct" DOUBLE);
DROP PROCEDURE USE_RPROF;
CREATE PROCEDURE USE_RPROF(OUT result "Rprof")
LANGUAGE RLANG AS
BEGIN
tmp