Re: pgbench stopped supporting large number of client connections on Windows

On 2020-11-06 23:54, Ranier Vilela wrote:
> Hi Marina,

Hello!

1) If you mean the function pgwin32_select in the file
src/backend/port/win32/socket.c, IIUC it is only used in the backend,
see src/include/port/win32_port.h:

#ifndef FRONTEND
<...>
#define select(n, r, w, e, timeout) pgwin32_select(n, r, w, e, timeout)
<...>
#endif                                                  /* FRONTEND */

2) It looks like FD_SETSIZE does not set a limit on the socket value on
Windows, see
https://docs.microsoft.com/en-us/windows/win32/winsock/maximum-number-of-sockets-supported-2
:

The maximum number of sockets that a Windows Sockets application can use
is not affected by the manifest constant FD_SETSIZE. This value defined
in the Winsock2.h header file is used in constructing the FD_SET
structures used with select function.