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Instead of believing SOMAXCONN from the system header files (which is 

a lie on many Unixen), invoke listen() with MIN(MaxBackends*2, 10000).
The clamp value 10000 is configurable in config.h.in, if that proves
to be necessary --- hopefully it won't.
This commit is contained in:
Tom Lane 2001-07-11 19:03:07 +00:00
parent d946b2083a
commit 153f400676
2 changed files with 32 additions and 8 deletions
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28
src/backend/libpq/pqcomm.c
View File

@ -29,7 +29,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pqcomm.c,v 1.117 2001/03/22 03:59:30 momjian Exp $
* $Id: pqcomm.c,v 1.118 2001/07/11 19:03:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -80,11 +80,6 @@
#include "miscadmin.h"
#ifndef SOMAXCONN
#define SOMAXCONN 5 /* from Linux listen(2) man page */
#endif
static void pq_close(void);
@ -185,6 +180,7 @@ StreamServerPort(int family, char *hostName, unsigned short portNumber,
SockAddr saddr;
int fd,
err;
int maxconn;
size_t len = 0;
int one = 1;
@ -350,7 +346,25 @@ StreamServerPort(int family, char *hostName, unsigned short portNumber,
}
#endif /* HAVE_UNIX_SOCKETS */
listen(fd, SOMAXCONN);
/*
* Select appropriate accept-queue length limit. PG_SOMAXCONN is
* only intended to provide a clamp on the request on platforms where
* an overly large request provokes a kernel error (are there any?).
*/
maxconn = MaxBackends * 2;
if (maxconn > PG_SOMAXCONN)
maxconn = PG_SOMAXCONN;
err = listen(fd, maxconn);
if (err < 0)
{
snprintf(PQerrormsg, PQERRORMSG_LENGTH,
"FATAL: StreamServerPort: listen() failed: %s\n",
strerror(errno));
fputs(PQerrormsg, stderr);
pqdebug("%s", PQerrormsg);
return STATUS_ERROR;
}
*fdP = fd;

12
src/include/config.h.in
View File

@ -8,7 +8,7 @@
* or in config.h afterwards. Of course, if you edit config.h, then your
* changes will be overwritten the next time you run configure.
*
* $Id: config.h.in,v 1.166 2001/06/11 22:12:48 momjian Exp $
* $Id: config.h.in,v 1.167 2001/07/11 19:03:07 tgl Exp $
*/
#ifndef CONFIG_H
@ -232,6 +232,16 @@
*/
#define DEFAULT_MAX_EXPR_DEPTH 10000
/*
* PG_SOMAXCONN: maximum accept-queue length limit passed to listen(2).
* You'd think we should use SOMAXCONN from <sys/socket.h>, but on many
* systems that symbol is much smaller than the kernel's actual limit.
* In any case, this symbol need be twiddled only if you have a kernel
* that refuses large limit values, rather than silently reducing the
* value to what it can handle (which is what most if not all Unixen do).
*/
#define PG_SOMAXCONN 10000
/*
* You can try changing this if you have a machine with bytes of another
* size, but no guarantee...