| From: | John Naylor <john(dot)naylor(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: benchmarking Flex practices |
| Date: | 2020-01-02 23:56:28 |
| Message-ID: | CACPNZCuQUejMsKy1Ym42-Z8o3T8MDOHffG_uSDc0aJ=3VbueFA@mail.gmail.com |
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| Lists: | pgsql-hackers |
I wrote:
> I no longer use state variables to track scanner state, and in fact I
> removed the existing "state_before" variable in ECPG. Instead, I used
> the Flex builtins yy_push_state(), yy_pop_state(), and yy_top_state().
> These have been a feature for a long time, it seems, so I think we're
> okay as far as portability. I think it's cleaner this way, and
> possibly faster.
I thought I should get some actual numbers to test, and the results
are encouraging:
master v10
info 1.56s 1.51s
str 1.18s 1.14s
unicode 1.33s 1.34s
uescape 1.44s 1.58s
--
John Naylor https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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