Unknown directive "aio" in Nginx 0.8.14

Hi all,

I installed Nginx 0.8.14 to try out a new feature: AIO support. Also, I
compiled Nginx with --with-file-aio

However, Nginx show warnings that it does not support AIO:

Starting nginx: [emerg]: unknown directive “aio” in
/usr/local/nginx/nginx.conf:46

Here is my configuration

    location ~* ^\/files\/(.+) {
        alias /home/files/$1;
        internal;
        aio on;
        # sendfile off;
        directio 512;
    }

Is this feature experimental and withdrawn?

Hello!

On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote:

Here is my configuration

    location ~* ^\/files\/(.+) {
        alias /home/files/$1;
        internal;
        aio on;
        # sendfile off;
        directio 512;
    }

Is this feature experimental and withdrawn?

No, the feature is here. Looks like you are running wrong binary
(or doesn’t compiled it properly).

Maxim D.

On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote:

Here is my configuration

    location ~* ^\/files\/(.+) {
        alias /home/files/$1;
        internal;
        aio on;
        # sendfile off;
        directio 512;
    }

Is this feature experimental and withdrawn?

Could you show this ./configure line:
checking for Linux AIO support …
?

Probabaly, your kernel does not support eventfd(), it’s available since
2.6.22 only.

BTW, instead of

     location ~* ^\/files\/(.+) {
         alias /home/files/$1;

it’s better to use just

     location /files/ {
         root /home;

Hi Igor

Here is the output after I run ./configure

checking for OS

  • Linux 2.6.18-128.2.1.el5 i686
    checking for C compiler … found
  • using GNU C compiler
  • gcc version: 4.1.2 20080704 (Red Hat 4.1.2-44)
    checking for gcc -pipe switch … found
    checking for gcc variadic macros … found
    checking for C99 variadic macros … found
    checking for unistd.h … found
    checking for inttypes.h … found
    checking for limits.h … found
    checking for sys/filio.h … not found
    checking for sys/param.h … found
    checking for sys/mount.h … found
    checking for sys/statvfs.h … found
    checking for crypt.h … found
    checking for Linux specific features
    checking for epoll … found
    checking for sendfile() … found
    checking for sendfile64() … found
    checking for sys/prctl.h … found
    checking for prctl(PR_SET_DUMPABLE) … found
    checking for sched_setaffinity() … found
    checking for crypt_r() … found
    checking for sys/vfs.h … found
    checking for nobody group … found
    checking for poll() … found
    checking for /dev/poll … not found
    checking for kqueue … not found
    checking for crypt() … not found
    checking for crypt() in libcrypt … found
    checking for O_DIRECT … found
    checking for F_NOCACHE … not found
    checking for directio() … not found
    checking for statfs() … found
    checking for statvfs() … found
    checking for dlopen() … not found
    checking for dlopen() in libdl … found
    checking for sched_yield() … found
    checking for PCRE library … found
    checking for system md library … not found
    checking for system md5 library … not found
    checking for OpenSSL md5 crypto library … found
    checking for zlib library … found
    creating objs/Makefile
    checking for int size … 4 bytes
    checking for long size … 4 bytes
    checking for long long size … 8 bytes
    checking for void * size … 4 bytes
    checking for uint64_t … found
    checking for sig_atomic_t … found
    checking for sig_atomic_t size … 4 bytes
    checking for socklen_t … found
    checking for in_addr_t … found
    checking for in_port_t … found
    checking for rlim_t … found
    checking for uintptr_t … uintptr_t found
    checking for system endianess … little endianess
    checking for size_t size … 4 bytes
    checking for off_t size … 8 bytes
    checking for time_t size … 4 bytes
    checking for setproctitle() … not found
    checking for pread() … found
    checking for pwrite() … found
    checking for strerror_r() … found but is not working
    checking for gnu style strerror_r() … found
    checking for localtime_r() … found
    checking for posix_memalign() … found
    checking for memalign() … found
    checking for mmap(MAP_ANON|MAP_SHARED) … found
    checking for mmap("/dev/zero", MAP_SHARED) … found
    checking for System V shared memory … found
    checking for struct msghdr.msg_control … found
    checking for ioctl(FIONBIO) … found
    checking for struct tm.tm_gmtoff … found
    checking for struct dirent.d_namlen … not found
    checking for struct dirent.d_type … found

Configuration summary

  • using system PCRE library
  • OpenSSL library is not used
  • md5: using system crypto library
  • sha1 library is not used
  • using system zlib library

nginx path prefix: “/usr/local/nginx”
nginx binary file: “/usr/local/nginx/sbin/nginx”
nginx configuration prefix: “/usr/local/nginx/conf”
nginx configuration file: “/usr/local/nginx/conf/nginx.conf”
nginx pid file: “/usr/local/nginx/logs/nginx.pid”
nginx error log file: “/usr/local/nginx/logs/error.log”
nginx http access log file: “/usr/local/nginx/logs/access.log”
nginx http client request body temporary files: “client_body_temp”
nginx http proxy temporary files: “proxy_temp”
nginx http fastcgi temporary files: “fastcgi_temp”

It says nothing about Linux AIO. Also, directio is said not to be found.
I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that
the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support
this feature.

Thanks,

Dinh

Igor S. wrote:

On Thu, Sep 10, 2009 at 11:26:14AM +0200, Dinh P. wrote:

Could you show this ./configure line:
checking for Linux AIO support …
?

Probabaly, your kernel does not support eventfd(), it’s available since
2.6.22 only.

Hello!

On Thu, Sep 10, 2009 at 01:40:35PM +0400, Igor S. wrote:

/usr/local/nginx/nginx.conf:46

Is this feature experimental and withdrawn?

Could you show this ./configure line:
checking for Linux AIO support …
?

Probabaly, your kernel does not support eventfd(), it’s available since
2.6.22 only.

Oops, looking at configure code - it doesn’t fail when it’s unable
to find any AIO support with --with-file-aio.

I think it should.

Maxim D.

On Thu, Sep 10, 2009 at 01:54:20PM +0400, Maxim D. wrote:

Oops, looking at configure code - it doesn’t fail when it’s unable
to find any AIO support with --with-file-aio.

I think it should.

You are right, it will be fixed in the next release.

On Thu, Sep 10, 2009 at 04:36:49PM +0400, Igor S. wrote:

I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that
the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support
this feature.

nginx requires eventfd() support in AIO.

BTW, nginx does not requires libaio at all. It uses direct syscalls.

On Thu, Sep 10, 2009 at 02:14:06PM +0200, Dinh P. wrote:

Hi Igor

Here is the output after I run ./configure

checking for OS

  • Linux 2.6.18-128.2.1.el5 i686

This kernel has no eventfd() support.

checking for sys/param.h … found
checking for crypt_r() … found
checking for statfs() … found
checking for statvfs() … found
checking for dlopen() … not found
checking for dlopen() in libdl … found
checking for sched_yield() … found

It’s strange: if you add --with-file-aio, you should see here:

checking for kqueue AIO support … not found
checking for Linux AIO support … not found

checking for uint64_t … found
checking for time_t size … 4 bytes
checking for System V shared memory … found

  • sha1 library is not used
    nginx http proxy temporary files: “proxy_temp”
    nginx http fastcgi temporary files: “fastcgi_temp”

It says nothing about Linux AIO. Also, directio is said not to be found.

Conversely found:
checking for O_DIRECT … found

You probably mixed up with F_NOCACHE which is MacOSX feature.

I am using CentOS 5.3 with libaio, libaio-devel installed. It seems that
the kernel equipped with CentOS 5.3/Redhat ES 5.3 is too old to support
this feature.

nginx requires eventfd() support in AIO.

Dinh P. escreveu:

Hi Igor

Here is the output after I run ./configure

checking for OS

  • Linux 2.6.18-128.2.1.el5 i686

Nothing can be more clear, your kernel does not suppport AIO -> Linux
2.6.18
Upgrade your kernel to 2.6.22 or newer!

Probabaly, your kernel does not support eventfd(), it’s available since
2.6.22 only.

Best regards,

Ranier Vilela

Sorry, I can’t seem to edit a post.

This:
Upon closer examination, it says checking for AIO… not
found
. I also notice directio says not found, and I want to use
directio feature as well.

Should be:
Upon closer examination, it says checking for AIO… found. I
also notice directio says not found, and I want to use directio feature
as well.

In other words, it says “AIO… found” yet it doesn’t work.

Mike

Posted at Nginx Forum:

I am having a similar problem and could use some help.

nginx 0.8.36 on Ubuntu 10.04 LTS, 2.6.32-21.

When I compile with --with-file-aio, it compiles fine but doesn’t work:

Restarting nginx: [emerg]: unknown directive "aio" in 
/etc/nginx/nginx.conf:16
configuration file /etc/nginx/nginx.conf test failed

Upon closer examination, it says checking for AIO… not found. I also
notice directio says not found, and I want to use directio feature as
well.

checking for OS
 + Linux 2.6.32-21-server x86_64
checking for C compiler ... found
 + using GNU C compiler
 + gcc version: 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
checking for gcc -pipe switch ... found
checking for gcc builtin atomic operations ... found
checking for gcc variadic macros ... found
checking for C99 variadic macros ... found
checking for unistd.h ... found
checking for inttypes.h ... found
checking for limits.h ... found
checking for sys/filio.h ... not found
checking for sys/param.h ... found
checking for sys/mount.h ... found
checking for sys/statvfs.h ... found
checking for crypt.h ... found
checking for Linux specific features
checking for epoll ... found
checking for sendfile() ... found
checking for sendfile64() ... found
checking for sys/prctl.h ... found
checking for prctl(PR_SET_DUMPABLE) ... found
checking for sched_setaffinity() ... found
checking for crypt_r() ... found
checking for sys/vfs.h ... found
checking for nobody group ... not found
checking for nogroup group ... found
checking for poll() ... found
checking for /dev/poll ... not found
checking for kqueue ... not found
checking for crypt() ... not found
checking for crypt() in libcrypt ... found
checking for F_READAHEAD ... not found
checking for posix_fadvise() ... found
checking for O_DIRECT ... found
checking for F_NOCACHE ... not found
checking for directio() ... not found
checking for statfs() ... found
checking for statvfs() ... found
checking for dlopen() ... not found
checking for dlopen() in libdl ... found
checking for sched_yield() ... found
checking for kqueue AIO support ... not found
checking for Linux AIO support ... found
checking for PCRE library ... found
checking for system md library ... not found
checking for system md5 library ... not found
checking for OpenSSL md5 crypto library ... found
checking for zlib library ... found
creating objs/Makefile
checking for int size ... 4 bytes
checking for long size ... 8 bytes
checking for long long size ... 8 bytes
checking for void * size ... 8 bytes
checking for uint64_t ... found
checking for sig_atomic_t ... found
checking for sig_atomic_t size ... 4 bytes
checking for socklen_t ... found
checking for in_addr_t ... found
checking for in_port_t ... found
checking for rlim_t ... found
checking for uintptr_t ... uintptr_t found
checking for system endianess ... little endianess
checking for size_t size ... 8 bytes
checking for off_t size ... 8 bytes
checking for time_t size ... 8 bytes
checking for setproctitle() ... not found
checking for pread() ... found
checking for pwrite() ... found
checking for strerror_r() ... found but is not working
checking for gnu style strerror_r() ... found
checking for sys_errlist[] ... found
checking for localtime_r() ... found
checking for posix_memalign() ... found
checking for memalign() ... found
checking for mmap(MAP_ANON|MAP_SHARED) ... found
checking for mmap("/dev/zero", MAP_SHARED) ... found
checking for System V shared memory ... found
checking for struct msghdr.msg_control ... found
checking for ioctl(FIONBIO) ... found
checking for struct tm.tm_gmtoff ... found
checking for struct dirent.d_namlen ... not found
checking for struct dirent.d_type ... found

Configuration summary
  + using system PCRE library
  + OpenSSL library is not used
  + md5: using system crypto library
  + sha1 library is not used
  + using system zlib library

  nginx path prefix: "/etc/nginx"
  nginx binary file: "/etc/nginx/sbin/nginx"
  nginx configuration prefix: "/etc/nginx"
  nginx configuration file: "/etc/nginx/nginx.conf"
  nginx pid file: "/var/run/nginx.pid"
  nginx error log file: "/var/log/nginx/error.log"
  nginx http access log file: "/var/log/nginx/access.log"
  nginx http client request body temporary files: "client_body_temp"
  nginx http proxy temporary files: "proxy_temp"
  nginx http fastcgi temporary files: "fastcgi_temp"

Help?

Mike

Posted at Nginx Forum: