Jim Apple has posted comments on this change.
Change subject: Experiment: glibc strncmp/memcmp appears much faster than SSE4.2
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Patch Set 1:
I can confirm this is much faster on my machine. Specifically, select count(*)
from long_strings where s <= repeat("a", 2048) is about 5x faster if every
value is repeat("a", 2048).
I can send a patch. What is a good table to use for adding a query like this to
targeted-perf?
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Gerrit-MessageType: comment
Gerrit-Change-Id: Ie4786a4a75fdaffedd6e17cf076b5368ba4b4e3e
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Jim Apple <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: Jim Apple <[email protected]>
Gerrit-Reviewer: Mostafa Mokhtar <[email protected]>
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