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blog code: LC_ALL=Cでsortを高速に
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| ##### LC_ALLによるsort速度比較 | |
| # まずbashでwords.txtを生成 | |
| # cat /dev/urandom | LC_ALL=C tr -dc '[:alnum:]' | fold -w 10 | head -n 1000000 > words.txt | |
| dat <- read.table("words.txt")[[1]] | |
| # 簡単な速度比較 | |
| bench <- function(lc_all) { | |
| Sys.setlocale(locale = lc_all) | |
| time <- proc.time() | |
| assign(lc_all, sort(dat), pos = globalenv()) | |
| proc.time() - time | |
| } | |
| bench("C") | |
| bench("ja_JP.UTF-8") | |
| bench("en_US.UTF-8") | |
| # 結果が同じかどうかの確認 | |
| all(get("C") == get("ja_JP.UTF-8")) | |
| all(get("C") == get("en_US.UTF-8")) | |
| all(get("ja_JP.UTF-8") == get("en_US.UTF-8")) | |
| # dplyrを使った場合の速度比較 | |
| bench2 <- function(lc_all) { | |
| Sys.setlocale(locale = lc_all) | |
| time <- proc.time() | |
| assign(lc_all, arrange(as.data.frame(dat), dat)[[1]], pos = globalenv()) | |
| proc.time() - time | |
| } | |
| bench2("C") | |
| bench2("ja_JP.UTF-8") | |
| bench2("en_US.UTF-8") | |
| # 結果の確認 | |
| all(get("C") == get("ja_JP.UTF-8")) | |
| all(get("C") == get("en_US.UTF-8")) | |
| all(get("ja_JP.UTF-8") == get("en_US.UTF-8")) |
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