From: "sam.saffron (Sam Saffron)" Date: 2013-12-23T16:56:35+09:00 Subject: [ruby-core:59280] [ruby-trunk - Bug #9262] global_method_cache should be configurable or grow automatically Issue #9262 has been updated by sam.saffron (Sam Saffron). Note: for comparison see the results on an unpatched 2.0.0 p353 --- home_page: 50: 35 75: 40 90: 107 99: 119 topic_page: 50: 12 75: 13 90: 17 99: 150 home_page_admin: 50: 45 75: 55 90: 118 99: 127 topic_page_admin: 50: 19 75: 21 90: 76 99: 100 timings: load_rails: 3644 ruby-version: 2.0.0-p353 architecture: amd64 operatingsystem: Ubuntu kernelversion: 3.11.0 memorysize: 5.89 GB physicalprocessorcount: 1 processor0: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz either the 16x size increase or the optimal falcon implementation means Ruby 2.1 no longer regress performance. ---------------------------------------- Bug #9262: global_method_cache should be configurable or grow automatically https://bugs.ruby-lang.org/issues/9262#change-43848 Author: tmm1 (Aman Gupta) Status: Open Priority: Normal Assignee: ko1 (Koichi Sasada) Category: Target version: next minor ruby -v: trunk Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN The global_method_cache is currently a fixed 2048 entries. This is not configurable, and can be inadequate for large applications with thousands of classes and methods. In our app, increasing the size of the cache to 32768 entries reduced time spent in search_method and overall pressure on st_lookup: before 420 14.0% st_lookup 182 6.1% vm_search_method (inline) after 265 9.5% st_lookup 125 4.5% vm_search_method (inline) It's possible the VM could grow global_method_cache automatically, using some heuristic based on the number of long-lived classes or method_entries that are defined. However this would break the hashing in the current implementation. -- http://bugs.ruby-lang.org/