Re: [Libevent-users] FD_SETSIZE - max connections in Windows - help!

["W.C.A. Wijngaards" <wouter@xxxxxxxxxxxx>]

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This problem is 64 max for the windows event notification calls,
WSAWaitForMultipleEvents.  select() probably calls one of the others
behind the scenes.

Best regards,
   Wouter

On 03/15/2010 05:56 PM, Patrick Galbraith wrote:
> Nick,
> 
> Thank you so much for your reply! At least now we're not looking in the
> wrong place. Have you or others you know of ever come across any
> limitations in general on windows?
> 
> Regards,
> 
> Patrick
> 
> Nick Mathewson wrote:
>> On Mon, Mar 15, 2010 at 12:03 PM, Patrick Galbraith <patg@xxxxxxxx>
>> wrote:
>>  
>>> Hi all,
>>>
>>> We have hit a brick wall with memcached - namely max connections with
>>> select.
>>>
>>> Namely, select from libvent use by memcached on windows, according to
>>> the
>>> documentation from MSDN you need to
>>> set FD_SETSIZE to the maximum number of sockets to use. By default
>>> FD_SETSIZE
>>> == 64. We set FD_SETSIZE to 2048 in  win32select.c at the top prior to
>>> including winsock2.h, but still no success. It seems to fail at 41
>>> connections.
>>>     
>>
>> I'm not sure why you're seeing this 41-connections issue, but I don't
>> think it has anything to do with FD_SETSIZE.  FD_SETSIZE affects the
>> declared size of the fd_set structure that select() uses.  But
>> Libevent doesn't believe the size of fd_set from the winsock2.h
>> header; instead, it allocates its own.  Look at the code for
>> FD_SET_ALLOC_SIZE.
>>
>> (For me, win32select doesn't top out at 41 connections.  It can handle
>> hundreds or thousands of connections easily, though the scaling gets
>> poor with thousands.)
>>
>> yrs,
>>   
> 
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