This is an Nginx fork that adds dtrace USDT probes.

Installation:

    ./configure --with-dtrace-probes \
        --with-dtrace=/usr/sbin/dtrace \
        ...
    make
    make install

Usage on Linux (with systemtap):

    # make the stap-nginx script visiable in your PATH
    export PATH=/usr/local/nginx/sbin:$PATH

    # list all the static probes available in your nginx
    stap-nginx -L 'process("nginx").mark("*")'

    # run the test.stp file
    stap-nginx test.stp

Sample test.stp file:

    probe begin
    {
        print("Tracing.  Hit CTRL-C to stop.\n")
    }

    probe process("nginx").mark("http-subrequest-start")
    {
        printf("uri: %s?%s\n", ngx_http_req_uri($arg1),
            ngx_http_req_args($arg1))
    }

For now, only tested on Solaris 11 Express and Fedora Linux 17.

The original Nginx documentation is available at http://nginx.org