Nothing
## ----setup, include = FALSE---------------------------------------------------
knitr::opts_chunk$set(echo = TRUE)
knitr::opts_chunk$set(fig.width=8, fig.height=4, fig.align = "center")
## -----------------------------------------------------------------------------
library(brotli)
library(ggplot2)
# Example data
myfile <- file.path(R.home(), "COPYING")
x <- readBin(myfile, raw(), file.info(myfile)$size)
# The usual suspects
y1 <- memCompress(x, "gzip")
y2 <- memCompress(x, "bzip2")
y3 <- memCompress(x, "xz")
y4 <- brotli_compress(x)
## -----------------------------------------------------------------------------
stopifnot(identical(x, memDecompress(y1, "gzip")))
stopifnot(identical(x, memDecompress(y2, "bzip2")))
stopifnot(identical(x, memDecompress(y3, "xz")))
stopifnot(identical(x, brotli_decompress(y4)))
## -----------------------------------------------------------------------------
# Combine data
alldata <- data.frame (
algo = c("gzip", "bzip2", "xz (lzma2)", "brotli"),
ratio = c(length(y1), length(y2), length(y3), length(y4)) / length(x)
)
ggplot(alldata, aes(x = algo, fill = algo, y = ratio)) +
geom_bar(color = "white", stat = "identity") +
xlab("") + ylab("Compressed ratio (less is better)")
## ---- eval = require(microbenchmark)------------------------------------------
library(microbenchmark)
bm <- microbenchmark(
memDecompress(y1, "gzip"),
memDecompress(y2, "bzip2"),
memDecompress(y3, "xz"),
brotli_decompress(y4),
times = 1000
)
alldata$decompression <- summary(bm)$median
ggplot(alldata, aes(x = algo, fill = algo, y = decompression)) +
geom_bar(color = "white", stat = "identity") +
xlab("") + ylab("Decompression time (less is better)")
## ---- eval = require(microbenchmark)------------------------------------------
library(microbenchmark)
bm <- microbenchmark(
memCompress(x, "gzip"),
memCompress(x, "bzip2"),
memCompress(x, "xz"),
brotli_compress(x),
times = 20
)
alldata$compression <- summary(bm)$median
ggplot(alldata, aes(x = algo, fill = algo, y = compression)) +
geom_bar(color = "white", stat = "identity") +
xlab("") + ylab("Compression time (less is better)")
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