From: | Hiroshi Inoue <inoue(at)tpf(dot)co(dot)jp> |
---|---|
To: | Barry Nicholson <b(dot)nicholson(at)niceng(dot)com> |
Cc: | pgsql-odbc(at)postgresql(dot)org |
Subject: | Re: FD_SETSIZE with large #s of files/ports in use |
Date: | 2010-05-19 00:02:22 |
Message-ID: | 4BF32A8E.3030900@tpf.co.jp |
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Thread: | |
Lists: | pgsql-odbc |
Hi,
Could you please try the attached patch?
regards,
Hiroshi Inoue
Barry Nicholson wrote:
> An interesting issue came up the other day. We are working with an
> application that opens a considerable number of files and tcp/udp ports
> (>3000). Unfortunately, that means that the odbc driver fails
> sometimes due to a corrupted stack. We eventually figured out what was
> causing the corrupted stack.
>
> The SOCK_wait_for_ready(SocketClass *sock, BOOL output, int retry_count)
> function inside socket.c calls select. Unfortunately, the socket file
> descriptor number can be quite large at this time. That means that the
> fd_set fds variable can misused. The fd_set variable type only allows
> 1024 file descriptors to be used by the calling program on many Linux
> versions. This can be changed by setting FD_SETSIZE or __FD_SETSIZE to
> a larger number. We have ran tests where we were able to change the
> __FD_SETSIZE value in
> /usr/src/...linuxversion../linux/include/linux/posix_types.h. The fix
> worked well.
>
> Unfortunately, this isn't a good solution because a software update to
> another linux version will invalidate our fix. We've tried various
> mechanisms to set FD_SETSIZE or __FD_SETSIZE in socket.c but with no
> luck. Has anyone else had this problem and came up with a good fix?
> Or is there a better solution?
>
> Barry Nicholson
> Niceng.com
Attachment | Content-Type | Size |
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socket.diff | text/plain | 1.2 KB |
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