| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Rajkumar Raghuwanshi <rajkumar(dot)raghuwanshi(at)enterprisedb(dot)com>, Beena Emerson <memissemerson(at)gmail(dot)com>, amul sul <sulamul(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
| Subject: | Re: [HACKERS] Runtime Partition Pruning |
| Date: | 2019-05-29 21:03:01 |
| Message-ID: | CA+TgmoZP3H6C8rB0OqGdh_=U-7QrcWUZFPOc0LcYMWn3am=Hew@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, May 24, 2019 at 12:09 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Is it actually better? The basic problem with backtrace() is that it
> only knows about global functions, and so reports call sites in static
> functions as if they were in whatever global function physically precedes
> the static one. I think doing materially better requires depending on
> debug symbols, which (at least in the Red Hat world) aren't going to
> be there in a typical production situation.
I don't have an opinion on glibc vs. libunwind, but I don't understand
this argument. If you are unlucky enough to have a production server
that is crashing due to some hitherto-unknown bug, and if it's not
possible to get a good backtrace without installing debugging symbols,
then you are going to have to pick between (1) installing those
debugging symbols and (2) getting a poor backtrace. I don't really
see that as a problem so much as just the way life is. You can't
expect to get good debugging output without debugging symbols, just as
you can't expect to get a clean audit without bank statements or a
clear idea of how to find your way to an unknown destination without a
map. If you don't have the thing that contains the information that
is needed, you can't get the information; c'est la vie.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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