Given an block of expressions in {} workout() individually times each
expression in the group. workout_expressions() is a lower level function most
useful when reading lists of calls from a file.
Usage
workout(expr, description = NULL)
workout_expressions(exprs, env = parent.frame(), description = NULL)Arguments
- expr
one or more expressions to workout, use
{}to pass multiple expressions.- description
A name to label each expression, if not supplied the deparsed expression will be used.
- exprs
A list of calls to measure.
- env
The environment in which the expressions should be evaluated.
Examples
workout({
x <- 1:1000
evens <- x %% 2 == 0
y <- x[evens]
length(y)
length(which(evens))
sum(evens)
})
#> # A tibble: 6 × 3
#> exprs process real
#> <bch:expr> <bch:tm> <bch:tm>
#> 1 x <- 1:1000 3.13µs 5.48µs
#> 2 evens <- x%%2 == 0 23.6µs 24.56µs
#> 3 y <- x[evens] 4.95µs 5.96µs
#> 4 length(y) 1.12µs 1.91µs
#> 5 length(which(evens)) 5.72µs 6.44µs
#> 6 sum(evens) 2.31µs 3.1µs
# The equivalent to the above, reading the code from a file
workout_expressions(as.list(parse(system.file("examples/exprs.R", package = "bench"))))
#> # A tibble: 6 × 3
#> exprs process real
#> <bch:expr> <bch:tm> <bch:tm>
#> 1 x <- 1:1000 2.47µs 3.81µs
#> 2 evens <- x%%2 == 0 19.31µs 20.27µs
#> 3 y <- x[evens] 5.98µs 7.15µs
#> 4 length(y) 1.1µs 1.91µs
#> 5 length(which(evens)) 5.2µs 6.2µs
#> 6 sum(evens) 2.22µs 3.1µs