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> time cat /tmp/list | fzf-0.10.1-darwin_amd64 --ansi -fqwerty > /dev/null
real 0m4.364s
user 0m8.231s
sys 0m0.820s
> time cat /tmp/list | fzf --ansi -fqwerty > /dev/null
real 0m4.624s
user 0m5.755s
sys 0m0.732s
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> wc -l /tmp/list2
2594098 /tmp/list2
> time cat /tmp/list2 | fzf-0.10.1-darwin_amd64 -fqwerty > /dev/null
real 0m5.418s
user 0m10.990s
sys 0m1.302s
> time cat /tmp/list2 | fzf-head -fqwerty > /dev/null
real 0m4.862s
user 0m6.619s
sys 0m0.982s
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I profiled fzf and it turned out that it was spending significant amount
of time repeatedly converting character arrays into Unicode codepoints.
This commit greatly improves search performance after the initial scan
by memoizing the converted results.
This commit also addresses the problem of unbounded memory usage of fzf.
fzf is a short-lived process that usually processes small input, so it
was implemented to cache the intermediate results very aggressively with
no notion of cache expiration/eviction. I still think a proper
implementation of caching scheme is definitely an overkill. Instead this
commit introduces limits to the maximum size (or minimum selectivity) of
the intermediate results that can be cached.
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