请教 Linux 下 Scrapy 内存占用非常大的问题

parse 的代码

    def parse_video_page(self, response: HtmlResponse):
        self.log('开始分析视频真实地址', level=logging.WARNING)
        title = response.css('#viewvideo-title::text').extract_first().strip()
        video_link = response.css('source::attr(src)').extract_first()
        if video_link:
            # 处理一下链接中 http://185.38.13.130//mp43/2998... 这种的 url
            video_link_list = video_link.split('//')
            real_video_link = video_link_list[0] + '//' + video_link_list[1] + '/' + video_link_list[2]

            self.log('获取到下载链接，丢入下载 pipelines', level=logging.WARNING)
            yield New91CrawlerItem(file_urls=real_video_link, file_name=title)
        else:
            self.log('获取视频下载地址失败，地址：{0}'.format(response.url), level=logging.WARNING)

这是 pipelines 的代码

class New91CrawlerPipeline(FilesPipeline):
    def get_media_requests(self, item, info):
        return scrapy.Request(url=item['file_urls'], meta=item)

    def file_path(self, request, response=None, info=None):
        name = request.meta['file_name']
        return name + '.mp4'