下载了UE4的源码后，运行Setup.bat时下载速度比较慢，可以通过开启多线程的方式下载，速度会快很多。
从文件内容可以看出，实际上是运行的\UnrealEngine-release\Engine\Binaries\DotNET\GitDependencies.exe
它的用法是：
Usage: GitDependencies [options] Options: --all Sync all folders --include=<X> Include binaries in folders called <X> --exclude=<X> Exclude binaries in folders called <X> --prompt Prompt before overwriting modified files --force Always overwrite modified files --root=<PATH> Set the repository directory to be sync --threads=<N> Use N threads when downloading new files --dry-run Print a list of outdated files and exit --max-retries Override maximum number of retries per file --proxy=<user:password@url> Sets the HTTP proxy address and credentials --cache=<PATH> Specifies a custom path for the download cache --cache-size-multiplier=<N> Cache size as multiplier of current download --cache-days=<N> Number of days to keep entries in the cache --no-cache Disable caching of downloaded files开启多线程的方法就是:set PROMPT_ARGUMENT=--prompt --threads= xx
(其中xx表示数量).
本文地址：http://blog.csdn.net/u011417605/article/details/71191253
