Hi, thanks for the report. On 25 Nov 2018, Timo Weingärtner wrote:
>with the last upgrade of bash-completion completing hostnames has >become slow (takes more than two seconds). My /etc/ssh/ssh_known_hosts >file has quite some size (23084 lines / 12 MB), but this was not a >problem with the previous implementation. OK, sounds like a lot of time. >I guess the problem is the while read … done < known_hosts_file loop, >where the shell has to read() one byte at a time, causing a massive >amount of syscalls (which have become even more costly this year). I have backported a patch [1] from the upstream master branch, in order to fix bug #848125 [2]. Running the following command against current upstream sources shows that there are no newer patches related to this (lines 1479 to 1665 contain the function, _known_hosts_real, that parses the known_hosts file): git log --stat -L1479,1665:bash_completion (lastest commit is the patch that I backported [1]) I think we need to forward this problem report upstream. Do you have more information that I could add to it (maybe the syscall trace you ran)? PS: I don't want to remove the patch from Debian, because it would only solve the problem you are reporting until bash-completion 2.9 is released. [1] https://github.com/scop/bash-completion/commit/71ac42b98c0eba39819fb8478d6443032c6ef6f1 [2] https://bugs.debian.org/848125
