common: improve shared_cache and simple_cache efficiency with hash table #6909
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…h bucket size Based on the PR ceph#4441 Signed-off-by: Ning Yao <zay11022@gmail.com>
if (weak_refs.count(key)) weak_refs[key] it traverses the b-tree twice replace it with weak_refs.find(key), which traverses b-tree once Signed-off-by: Ning Yao <zay11022@gmail.com>
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common: improve shared_cache and simple_cache efficiency with hash table Reviewed-by: Sage Weil <sage@redhat.com>
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This PR is based on the discussion of #4441
use the trick, rehash(), to initialize the bucket size of the hashmap.
Signed-off-by: Ning Yao zay11022@gmail.com