git.m6w6.name Git - awesomized/libmemcached/blob - memcached/BUILD

   1 Ideally, you want to make a static binary, otherwise the dynamic
   2 linker pollutes your address space with shared libs right in the
   3 middle.  (NOTE: actually, this shouldn't matter so much anymore, now
   4 that we only allocate huge, fixed-size slabs)
   5
   6 Make sure your libevent has epoll (Linux) or kqueue (BSD) support.
   7 Using poll or select only is slow, and works for testing, but
   8 shouldn't be used for high-traffic memcache installations.
   9
  10 To build libevent with epoll on Linux, you need two things. First,
  11 you need /usr/include/sys/epoll.h . To get it, you can install the
  12 userspace epoll library, epoll-lib. The link to the latest version
  13 is buried inside
  14 http://www.xmailserver.org/linux-patches/nio-improve.html ; currently
  15 it's http://www.xmailserver.org/linux-patches/epoll-lib-0.9.tar.gz .
  16 If you're having any trouble building/installing it, you can just copy
  17 epoll.h from that tarball to /usr/include/sys as that's the only thing
  18 from there that libevent really needs.
  19
  20 Secondly, you need to declare syscall numbers of epoll syscalls, so
  21 libevent can use them. Put these declarations somewhere
  22 inside <sys/epoll.h>:
  23
  24 #define __NR_epoll_create               254
  25 #define __NR_epoll_ctl          255
  26 #define __NR_epoll_wait         256
  27
  28 After this you should be able to build libevent with epoll support.
  29 Once you build/install libevent, you don't need <sys/epoll.h> to
  30 compile memcache or link it against libevent. Don't forget that for epoll
  31 support to actually work at runtime you need to use a kernel with epoll
  32 support patch applied, as explained in the README file.
  33
  34 BSD users are luckier, and will get kqueue support by default.
  35
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  37