[Image](/uploads/documents/6/9/c/7/69c720fb72a670af19d442ea203d8521/p27_1.jpg) ## Zero-copy syscalls 支持零拷贝的系统调用 sendfile() • copy file range() • mmap() • splice() / vmsplice() / tee() • KTLS (kernel-space TLS)  ## sendfile() (zero-copy) import socket, os sock = socket.create_server("", 8080) while True: conn, addr = sent = os.sendfile(conn.fileno(), file.fileno(), offset, 65536) if sent == 0: break # EOF offset += sent conn.close() ||read() / write()|sendfile()| |---|---|---|

bandwidth. Non-permanent sessions are not affected. Default: True ## USE X SENDFILE When serving files, set the x-Sendfile header instead of serving the data with Flask. Some web servers, such as Apache False, 'TRAP_BAD_REQUEST_ERRORS': None, 'TRAP_HTTP_EXCEPTIONS': False, 'USE_X_SENDFILE': False} Default configuration parameters. ## dispatch_request() Does the request dispatching register a function, use url value preprocessor(). ## ▶ Changelog ## use_x_sendfile Enable this if you want to use the X-Sendfile feature. Keep in mind that the server has to support this. This only affects

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support for

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support for

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support the

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support for

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support for

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support the

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## Run-Time Configuration basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support the

improvements to their TCP stacks and thread libraries in recent years. - If your OS supports a sendfile(2) system call, make sure you install the release and/or patches needed to enable it. (With Linux For early releases of Solaris 8, you may need to apply a patch.) On systems where it is available, sendfile enables Apache 2 to deliver static content faster and with lower CPU utilization. ## ▲ ## Run-Time basis.) ## Sendfile In situations where Apache 2.x can ignore the contents of the file to be delivered -- for example, when serving static file content -- it normally uses the kernel sendfile support the