| From: | Thom Brown <thom(at)linux(dot)com> |
|---|---|
| To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | FD_SETSIZE on Linux? |
| Date: | 2014-09-09 22:46:59 |
| Message-ID: | CAA-aLv4ftLRHSb+vVyuotVMoE1pqxk9LxawoNrfzF0Z=SG46QA@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hi,
I noticed when trying to set pgbench's client count to a high number, I had
to reduce it, and I found the maximum I can get away with is 1014. Any
higher and I get:
invalid number of clients: 1015
I find this in pgbench.c:
#ifdef FD_SETSIZE
#define MAXCLIENTS (FD_SETSIZE - 10)
#else
#define MAXCLIENTS 1024
#endif
And FS_SETSIZE defined before it:
#ifdef WIN32
#define FD_SETSIZE 1024 /* set before winsock2.h is
included */
#endif /* ! WIN32 */
... but apparently only if using Windows, which I'm not.
So it appears that MAXCLIENTS is being set to 1014 (1024 - 10), which looks
like should only be the case on Windows.
I'm a bit confused here. Shouldn't my MAXCLIENTS be set to 1024?
Thom
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