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https://issues.apache.org/jira/browse/ARROW-16850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17555880#comment-17555880
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Antoine Pitrou commented on ARROW-16850:
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Interesting. This shows that sometimes performance can be counter-intuitive.
> [C++] Improve csv writer by copying data and delimiter separately
> -----------------------------------------------------------------
>
> Key: ARROW-16850
> URL: https://issues.apache.org/jira/browse/ARROW-16850
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Yibo Cai
> Assignee: Yibo Cai
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> Profiling csv writer with Arm Statistical Profiling Extension (SPE) reveals
> there is relatively high branch misprediction rate from {{memcpy}}, due to
> interleaving copying data field and delimiter which is very short(1 or 2
> chars). Copying delimiter with specific code, {{memcpy}} only the data field
> improves performance significantly.
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