Created
May 27, 2016 00:23
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require "benchmark/ips" | |
require "csv" | |
# Data: Fielding.csv from Lahman Baseball Database, sorted | |
# http://seanlahman.com/baseball-archive/statistics/ | |
FILENAME = File.expand_path("Fielding-sorted.csv", __dir__) | |
MATCH_FIELD = "kruegot01" # Record in the middle of the file | |
NUM_ROWS = 5 # Grab this many rows (for lack of anything better to do) | |
def method_a | |
rows = [] | |
CSV.foreach(FILENAME, headers: true) do |row| | |
next unless row["playerID"] == MATCH_FIELD | |
rows << row | |
return rows if rows.size == NUM_ROWS | |
end | |
end | |
def method_b | |
file = File.open(FILENAME) | |
headers = CSV.parse_line(file.gets) | |
match = "#{MATCH_FIELD}," | |
while line = file.gets | |
break if line.start_with?(match) | |
end | |
# back up to the beginning of the line | |
file.seek(-line.size, IO::SEEK_CUR) | |
CSV.new(file, headers: headers).take(NUM_ROWS) | |
ensure | |
file.close | |
end | |
Benchmark.ips do |x| | |
x.report("method_a") { method_a } | |
x.report("method_b") { method_b } | |
x.compare! | |
end |
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Warming up -------------------------------------- | |
method_a 1.000 i/100ms | |
method_b 1.000 i/100ms | |
Calculating ------------------------------------- | |
method_a 0.100 (± 0.0%) i/s - 1.000 in 9.987337s | |
method_b 6.575 (±15.2%) i/s - 33.000 | |
Comparison: | |
method_b: 6.6 i/s | |
method_a: 0.1 i/s - 65.67x slower |
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