From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, jungleboogie0(at)gmail(dot)com, pgsql-bugs(at)lists(dot)postgresql(dot)org, Michael Paquier <michael(at)paquier(dot)xyz> |
Subject: | Re: BUG #15964: vacuumdb.c:187:10: error: use of undeclared identifier 'FD_SETSIZE' |
Date: | 2019-08-19 02:59:54 |
Message-ID: | 20190819025953.GA15110@alvherre.pgsql |
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Lists: | pgsql-bugs |
On 2019-Aug-17, Andres Freund wrote:
> Hm. This made me think: Why is
>
> if (concurrentCons > FD_SETSIZE - 1)
> {
> pg_log_error("too many parallel jobs requested (maximum: %d)",
> FD_SETSIZE - 1);
>
> a useful test / error message? FD_SETSIZE is about the numerical value
> of fds. There will usually be at least three fds open, starting at 0 -
> but there easily can be more, depending on what the reindexdb/vacuumdb
> caller is doing.
Hmm ... yeah, this is clearly not perfect. In my laptop, vacuumdb -j 1021
works; 1022 and 1023 fail like this after opening a number of conns:
vacuumdb: vacuuming database "alvherre"
vacuumdb: error: could not connect to database alvherre: could not look up local user ID 1000: Too many open files
and 1024 fails like this immediately on start:
vacuumdb: error: too many parallel jobs requested (maximum: 1023)
After 'ulimit -n 1200', vacuumdb -j1023 fails like this:
vacuumdb: vacuuming database "alvherre"
*** buffer overflow detected ***: vacuumdb terminated
Aborted
So I agree that we need a fix.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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