In Search of Lost Time: GNU Grep 3.7 released with fix for 'extreme performance degradation'
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GNU grep 3.7 has been released with a fix for a bug causing "extreme performance degradation" in certain types of search. This search tool, which looks for character patterns in files, is a core utility on Linux and other Unix-like operating systems. In November last year, a user noted: "I have a use case where I run grep with a large number of search patterns on a large text file. It works well with grep-3.3, but with grep-3.4 it quickly burned through GBs of memory and almost locked up my system due to swapping ... even with just 30,000 patterns it exceeds the limit of 5GB." By contrast, grep 3.3 used "just a few 100MB."
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