Created
February 20, 2019 09:40
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Warming up -------------------------------------- | |
reorder_versions 1.000 i/100ms | |
reorder_versions_bulk | |
1.000 i/100ms | |
reorder_versions_prep | |
1.000 i/100ms | |
Calculating ------------------------------------- | |
reorder_versions 0.277 (_ 0.0%) i/s - 2.000 in 7.230304s | |
reorder_versions_bulk | |
3.749 (_ 0.0%) i/s - 19.000 in 5.078283s | |
reorder_versions_prep | |
3.481 (_ 0.0%) i/s - 18.000 in 5.198946s | |
Comparison: | |
reorder_versions_bulk: 3.7 i/s | |
reorder_versions_prep: 3.5 i/s - 1.08x slower | |
reorder_versions: 0.3 i/s - 13.55x slower | |
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def reorder_versions | |
numbers = reload.versions.sort.reverse.map(&:number).uniq | |
versions.each do |version| | |
Version.find(version.id).update_column(:position, numbers.index(version.number)) | |
end | |
versions.update_all(latest: false) | |
versions_of_platforms = versions | |
.release | |
.indexed | |
.group_by(&:platform) | |
versions_of_platforms.each_value do |platforms| | |
Version.find(platforms.max.id).update_column(:latest, true) | |
end | |
end | |
def reorder_versions_bulk | |
numbers = reload.versions.sort.reverse.map(&:number).uniq | |
ids, positions = Array.new, Array.new | |
versions.each do |version| | |
ids << version.id | |
positions << numbers.index(version.number) | |
end | |
bulk_sql = <<-SQL | |
update versions set position = data_table.position, latest = false | |
from | |
(select unnest(array#{ids}) as id, | |
unnest(array#{positions}) as position) as data_table | |
where versions.id = data_table.id; | |
SQL | |
ActiveRecord::Base.connection.execute(bulk_sql) | |
versions_of_platforms = versions | |
.release | |
.indexed | |
.group_by(&:platform) | |
versions_of_platforms.each_value do |platforms| | |
Version.find(platforms.max.id).update_column(:latest, true) | |
end | |
end | |
def reorder_versions_prep | |
numbers = reload.versions.sort.reverse.map(&:number).uniq | |
sql = %q{ | |
PREPARE fooplan (int, int) AS | |
UPDATE versions | |
SET position=$2, | |
latest=false | |
WHERE id=$1; | |
BEGIN;} | |
versions.each do |v| | |
sql << "EXECUTE fooplan(#{v.id}, '#{numbers.index(v.number)}');" | |
end | |
sql << 'COMMIT;DEALLOCATE fooplan;' | |
ActiveRecord::Base.connection.execute(sql) | |
versions_of_platforms = versions | |
.release | |
.indexed | |
.group_by(&:platform) | |
versions_of_platforms.each_value do |platforms| | |
Version.find(platforms.max.id).update_column(:latest, true) | |
end | |
end |
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require 'benchmark/ips' | |
Benchmark.ips do |x| | |
x.report("reorder_versions") do | |
gems = ["nokogiri", "mocha", "activerecord"] | |
gems.each do |name| | |
Rubygem.find_by(name: name).reorder_versions | |
end | |
end | |
x.report("reorder_versions_bulk") do | |
gems = ["nokogiri", "mocha", "activerecord"] | |
gems.each do |name| | |
Rubygem.find_by(name: name).reorder_versions_bulk | |
end | |
end | |
x.report("reorder_versions_prep") do | |
gems = ["nokogiri", "mocha", "activerecord"] | |
gems.each do |name| | |
Rubygem.find_by(name: name).reorder_versions_prep | |
end | |
end | |
x.compare! | |
end |
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