| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Craig Ringer <craig(at)2ndquadrant(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: OK, so culicidae is *still* broken |
| Date: | 2017-04-24 18:50:29 |
| Message-ID: | 20170424185029.xm5yjkrifajcmmco@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2017-04-24 14:43:11 -0400, Tom Lane wrote:
> (We have accepted that kind of overhead for DSM segments, but the
> intention I think is to allow only very trivial data structures in
> the DSM segments. Losing compiler pointer type checking for data
> structures like the lock or PGPROC tables would be horrid.)
The relptr.h infrastructure brings some of the type-checking back, but
it's still pretty painful. And just as important, it's quite noticeable
performance-wise. So we have to do it for dynamic shm (until/unless we
go to using threads), but that doesn't mean we should do it for some of
the most performance critical data structures in PG...
- Andres
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