| 1 | #!/usr/bin/env bash
|
| 2 | #
|
| 3 | # Usage:
|
| 4 | # benchamrks/builtin-io.sh <function name>
|
| 5 |
|
| 6 | set -o nounset
|
| 7 | set -o pipefail
|
| 8 | set -o errexit
|
| 9 |
|
| 10 | readonly BIG=_tmp/1m_lines.txt
|
| 11 |
|
| 12 | setup() {
|
| 13 | seq 1000000 > $BIG
|
| 14 |
|
| 15 | }
|
| 16 |
|
| 17 | # 25 ms
|
| 18 | wc-big() {
|
| 19 | time wc -l $BIG
|
| 20 | }
|
| 21 |
|
| 22 | # bash takes 156 ms here! Significantly slower than 'wc'.
|
| 23 | # bin/osh in Python takes over 5 seconds!
|
| 24 | #
|
| 25 | # TODO:
|
| 26 | # - Make sure bin/osh in C++ is reasonably fast.
|
| 27 | # - Make sure a loop with read --line is reasonably fast.
|
| 28 |
|
| 29 | mapfile-big() {
|
| 30 | time mapfile < $BIG
|
| 31 | echo ${#MAPFILE[@]} # verify length
|
| 32 | }
|
| 33 |
|
| 34 | # Hm this isn't that fast either, about 100 ms.
|
| 35 | python-big() {
|
| 36 | time python -S -c '
|
| 37 | import sys
|
| 38 | i = 0
|
| 39 | for line in sys.stdin:
|
| 40 | i += 1
|
| 41 | print(i)
|
| 42 | ' < $BIG
|
| 43 | }
|
| 44 |
|
| 45 | bash-syscall() {
|
| 46 | # Shows that there are tons of read(0, 1) calls!
|
| 47 | seq 20 | strace -e read -- bash -c 'mapfile'
|
| 48 | }
|
| 49 |
|
| 50 | python-syscall() {
|
| 51 | # Does read(0, 4096). A saner way to read files
|
| 52 | seq 20 | strace -e read -- python -c '
|
| 53 | import sys
|
| 54 | for line in sys.stdin:
|
| 55 | print(line)
|
| 56 | '
|
| 57 | }
|
| 58 |
|
| 59 |
|
| 60 | "$@"
|