But if the size of the file is known beforehand, persistent preallocation is the best route.
不过如果预先知道文件的大小时，持久化预分配是更好的选择。
Ext4 permits preallocation without doing this, which can improve the performance of some database and multimedia tools.
而ext4允许提前分配，无需进行上述操作，这能提高某些数据库和多媒体工具的性能。
Ext4 permits preallocation without doing this, which can improve the performance of some database and multimedia tools.
而ext4允许提前分配，无需进行上述操作，这能提高某些数据库和多媒体工具的性能。
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