Hi Chuck,
> I started mucking around with the code in mailbox::send() to fix the
> assertion that OSX users (like me) oftentimes get in high-volume situations.
>
> For one, getsockopt() returns 0 on OSX! So the line to expand the SNDBUF
> doesn't work:
>
> new_sndbuf = old_sndbuf * 2;
>
> Obviously, 0 times anything is 0 so the expansion fails.
>
> The other weird thing on OSX is that when getsockopt() does return a valid
> value, it's in kilobytes instead of bytes. That is, it will return 32 when it
> should return 32768.
>
> So I rewrote the logic to expand the buffer like so:
>
> new_sndbuf = (old_sndbuf == 0) ? 32768 : (old_sndbuf * 2048);
>
> It works. I no longer get the assertion.
>
> However, that code will likely break horribly on linux.
1. Solving the getsockopt()=0 issue
What I think should be done is to specify the initial buffer size
explicitly in config.hpp (say 64kB). mailbox_t would set the buffer size
when created and remember the actual buffer size. That way there would
be able to know the buffer size without calling getsockopt().
2. The B/kB issue should be solved like this:
#ifdef ZMQ_HAVE_OSX
buffer_size = initial_buffer_size
#else
buffer_size = initial_buffer_size * 1024
#endif
Martin
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