Python pil 压缩图片内存过高

    def resize_image(self, src_path: Path, width=800):
        self.echo_sub('开始压缩图片.')
        chunk_size = self.config.get('chunk_size') or 5
        with futures.ThreadPoolExecutor(10) as executor:
            args = ((p, width) for p in src_path.glob('*'))
            for result, image_size in executor.map(lambda a: resize_width(*a), args, chunksize=chunk_size):
                width, height = image_size
                if width > height or result.name == 'cover.jpg':
                    self.thumbnail.append(result)
                self.echo_sub(f'{result} {width}x{height}.', fg='red')
        self.echo_sub_done('图片压缩完成.')
        
    def resize_width(src_file: Path, width, new_name=None, quality=95, sample=Image.ANTIALIAS):
        dest_file = get_dest_file(src_file, new_name)
        with src_file.open('r+b') as f:
            with Image.open(f) as image:
                img = image.copy()
                img_size = img.size
                if img_size[0] > width:
                    new_height = int(math.ceil((width / img_size[0]) * img_size[1]))
                    img.thumbnail((width, new_height), sample)
                    img.save(str(dest_file), quality=quality)
                return dest_file, img.size
        

run log

• 17:52:12 - 开始压缩图片.
• Killed

查看 syslog

Out of memory: Killed process 16194 (python3) total-vm:1612348kB, anon-rss:621232kB, file-rss:1664kB, shmem-rss:0kB, UID:0 pgtables:1634304kB oom_score_adj:0

单张图片 5M 内

几个线程怎么跑了这么内存?