Issue #21119 has been updated by wanabe (_ wanabe). Status changed from Open to Closed ddb8d353acdf412f427e07fd04796da67e512d8b == https://github.com/ruby/ruby/pull/15840 (== a part of https://bugs.ruby-lang.org/issues/21685) fixed the issue. ``` $ git checkout ddb8d353acdf412f427e07fd04796da67e512d8b~ && make -j miniruby >/dev/null 2>&1 && time ./miniruby ../a.rb Previous HEAD position was ddb8d353acd Give the hot thread scheduler priority HEAD is now at d241be17a0d Bump taiki-e/install-action aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa real 2m4.373s user 2m4.291s sys 0m0.141s $ git checkout ddb8d353acdf412f427e07fd04796da67e512d8b && make -j miniruby >/dev/null 2>&1 && time ./miniruby ../a.rb Previous HEAD position was d241be17a0d Bump taiki-e/install-action HEAD is now at ddb8d353acd Give the hot thread scheduler priority aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa real 0m1.837s user 0m1.828s sys 0m0.008s ``` ---------------------------------------- Bug #21119: Programs containing `Dir.glob` with a thread executing a CPU-heavy task run very slowly. https://bugs.ruby-lang.org/issues/21119#change-118778 * Author: genya0407 (Yusuke Sangenya) * Status: Closed * ruby -v: ruby 3.5.0dev (2025-02-06T14:10:34Z master adbf9c5b36) +PRISM [arm64-darwin24] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Executing the following code in Ruby 3.4.1 takes a very long time, especially when there are many files \(100~\) in the current directory. This delay does not occur in Ruby 3.3.6. ## Reproducible script ```ruby # hoge.rb # Launch a thread to execute CPU-heavy task Thread.new do loop do arr = [] 100.times do arr << rand(1...100) end end end # Execute a program containing `Dir.glob` in the main thread. 10.times do Dir.glob('*') puts "aaaa" end ``` ## Execution Results Executing the above code in Ruby 3.4.1 takes **119.43s**. ```shell $ ruby -v ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin24] $ time ruby hoge.rb aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa ruby hoge.rb 119.43s user 0.30s system 99% cpu 1:59.89 total ``` Executing it in Ruby master also takes **118.87s**. ```shell $ ~/opt-ruby/bin/ruby -v ruby 3.5.0dev (2025-02-06T14:10:34Z master adbf9c5b36) +PRISM [arm64-darwin24] $ time ~/opt-ruby/bin/ruby hoge.rb aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa ~/opt-ruby/bin/ruby hoge.rb 118.87s user 0.46s system 99% cpu 2:00.45 total ``` Executing it in Ruby 3.3.6 takes only **2.22s**. ```shell $ ruby -v ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [arm64-darwin24] $ time ruby hoge.rb aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa ruby hoge.rb 2.22s user 0.03s system 98% cpu 2.286 total ``` So, there are roughly **50x** delays. ## Possible Cause From Ruby 3.4.0, `Dir.glob` releases the GVL frequently. * https://bugs.ruby-lang.org/issues/20587 * https://github.com/ruby/ruby/pull/11147 Due to this change, when a CPU-heavy thread releases the GVL, `Dir.glob` also releases the GVL immediately. As a result, `Dir.glob` gets significantly delayed because it has to continuously regain the GVL causing a major slowdown in execution. ## Note about Execution Results I measured the execution results under a stress condition, with 100 files in the current directory. If there are fewer files, the slowdown may be less pronounced. -- https://bugs.ruby-lang.org/