Hi Pieter, Thanks for the quick response. Alan
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Pieter Hintjens Sent: 21 August 2013 11:52 To: ZeroMQ development list Subject: Re: [zeromq-dev] Maximum message size on Windows There is no maximum defined message size. What you are seeing is the default stack size of 1MB being hit by your use of a huge local variable. In general do not put anything larger than a few kilobytes into local storage since depending on the build, the stack can be as small as 4KB. You don't get any warning, just a nasty crash. Use dynamic allocation, and it will work up to the limit of heap memory. -Pieter On Wed, Aug 21, 2013 at 12:43 PM, Alan Ward <[email protected]> wrote: > Hi, > I have an application that I have been developing on Linux (Ubuntu) > for a few months. > I am now trying to port it to Windows. > > After battling with Visual Studio for a while I now have the code > executing, but have immediately hit a problem with the maximum message size. > > On Linux I have a maximum message size of 1Mb (1048576). This is > fairly arbitrary so I can reduce it. > On Windows this causes zmq_recv to crash. I have found that the > threshold is around 1027830. > > I am using the 32-bit version of zeromq (3.2.3) on Windows and 64-bit > (3.2.2) on Linux. > > The following code snippet causes an exception on my system. > > #include <zmq.h> > #include <stdio.h> > #include <tchar.h> > #include <string.h> > #include <assert.h> > > int _tmain(int argc, _TCHAR* argv[]) > { > int rc; > char buffer [ 1027830 ]; > void *context; > void *responder; > size_t msg_size; > > puts("start"); > context = zmq_ctx_new (); > responder = zmq_socket (context, ZMQ_REP); > rc = zmq_bind (responder, "tcp://*:5555"); > if ( rc != 0 ) { printf("zmq_bind error: rc:%d:errno:%d\n", rc, > errno); return 1; } > > msg_size = zmq_recv (responder, buffer, 2048, 0); > > return 0; > } > > Is there a defined maximum size? I did search for some information on > this a while ago, but found nothing. > > Regards, > Alan > > _______________________________________________ > zeromq-dev mailing list > [email protected] > http://lists.zeromq.org/mailman/listinfo/zeromq-dev _______________________________________________ zeromq-dev mailing list [email protected] http://lists.zeromq.org/mailman/listinfo/zeromq-dev ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6594 - Release Date: 08/20/13 _______________________________________________ zeromq-dev mailing list [email protected] http://lists.zeromq.org/mailman/listinfo/zeromq-dev
