Nothing
suppressMessages(library(qs))
suppressMessages(library(dplyr))
file <- "/tmp/test.z"
dataframeGen <- function() {
nr <- 1e6
data.frame(a=rnorm(nr),
b=rpois(100,nr),
c=sample(starnames[["IAU Name"]],nr,T),
d=factor(sample(state.name,nr,T)), stringsAsFactors = F)
}
listGen <- function() {
as.list(sample(1e6))
}
# grid <- expand.grid(data = c("list", "dataframe"),
# preset = c("fast", "balanced", "high", "archive"),
# nt = c(1,4), reps=1:3, stringsAsFactors = F)
# grid <- grid %>% filter(! (preset == "archive" & nt == 4) )
grid <- expand.grid(data = c("list", "dataframe"),
preset = c("fast", "balanced", "high"),
nt = c(1,4), reps=1:25, stringsAsFactors = F)
write_time <- numeric(nrow(grid))
read_time <- numeric(nrow(grid))
for(i in 1:nrow(grid)) {
print(i)
if(grid$data[i] == "list") {
x <- listGen()
} else if(grid$data[i] == "dataframe") {
x <- dataframeGen()
}
time <- as.numeric(Sys.time())
qsave(x, file, preset = grid$preset[i], nthreads = grid$nt[i])
write_time[i] <- 1000 * (as.numeric(Sys.time()) - time)
rm(x); gc()
time <- as.numeric(Sys.time())
x <- qread(file, nthreads=grid$nt[i])
read_time[i] <- 1000 * (as.numeric(Sys.time()) - time)
rm(x); gc()
}
grid$write_time <- write_time
grid$read_time <- read_time
grid %>% group_by(data, preset, nt) %>%
summarize(n=n(), mean_read_time = mean(read_time),
median_read_time = median(read_time),
mean_write_time = mean(write_time),
median_write_time = median(write_time)) %>% as.data.frame
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