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Re: performance bug of `wc -m` on glibc systems
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From: |
Bruno Haible |
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Subject: |
Re: performance bug of `wc -m` on glibc systems |
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Date: |
Mon, 21 May 2018 20:01:09 +0200 |
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User-agent: |
KMail/5.1.3 (Linux/4.4.0-124-generic; KDE/5.18.0; x86_64; ; ) |
With the proposed function-pointer-factory changes, I'm seeing
this speedup on glibc systems:
num mbc
Before 0.056 0.152
After 0.057 0.089
-------
Speedup 1.0 1.7
factor
Find attached the profiling result.
What you can see:
- The glibc-compatible rewrite of UTF-8 mbrtowc is about 4.5 times faster
than the glibc implementation.
- The glibc wcwidth and the gnulib uc_width are approximately on par,
regarding speed. uc_width is probably slightly slower, but not
dramatically.
Bruno
callgrind.out.11605.png
Description: application/kcachegrind
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