Libev vs. libevent benchmark (reloaded)

[Marc Lehmann]

On Mon, Apr 19, 2010 at 01:26:33AM +0200, Marc Lehmann <schmorp at schmorp.de> wrote:
> Sorry, forgot to mention that this can easily explain the perceived
> performance, as libev does EPOLL_CTL_MOD, while libevent does
> EPOLL_CTL_ADD, which is faster in the benchmark case (it simply errors out
> without writing memory), but does not support fork.

If anybody who can actually benchmark this (I still can't), you can get the
same effect by replacing:

  if (expect_true (!epoll_ctl (backend_fd, oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd, &ev)))

with:

  if (expect_true (!epoll_ctl (backend_fd, oev && oev != nev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD, fd, &ev)))

in ev_epoll.c.

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