我想将一大笔金字塔式文件(存放在DC/shm direcotry)复制到当地磁盘上,是用某种方式复制,而不是用一个代子阅读,还是制造另一个零星的记忆? 我只能在这里使用C语。 我是否能够把记忆档案直接放在软盘上? 感谢!
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感谢你们为帮助gu! 我用毫米口径的卷宗将其编成,把整块直接写到目的地。 影像没有使用,因为我实际上正在书写一个平行的档案系统,该系统不支持微粒操作。
/dev/shm是分享的记忆,这样一来,它就会成为分享记忆的开张,但坦率地说,我认为你会获得任何东西。
when writing your memory file to disk, the bottleneck will be the disk. just be sure to write data in big chunks, and you should be fine.
你可以像任何其他档案一样复制:
cp /dev/shm/tmp ~/tmp
因此,迅速而简单的办法是发布<条码>cp。 经由<编码>系统()进行指挥。
您可尝试看到<代码>splice系统是否要求这样做。 我不敢肯定的是,如果它会限制它能够与它合作的各类档案,但如果它确实工作,那么你会一再以记忆页的大小(或几页的大小)要求将其称之为,直到其完成为止,而且该星座会非常积极地处理。
If this doesn t work you ll need to do either mmap or do plain old read/write.
Reading and Writing in memory page sized chunks makes things much more efficient. It can be even more efficient if your buffers are memory page size aligned since it opens up the oppurtunity for the kernel to just move the data to/from your process s memory via memory managment trickery rather than actually copying the data around.
你们所能做的唯一事情是()在页数上与地块一致。 我假定,你需要保证数据为书面数据,即意味着绕过缓冲器,途径是沉积-fadvise()或使用O_DIRECT(我通常使用权宜之计),但O_DIRECT在此是适当的。
在此情况下,仅凭媒体的速度就决定了这种速度。
如果你不需要绕过缓冲,则行动将更快完成,但是没有保证,如果出现一个 re/停电等,数据将实际书写。 由于数据来源是共享的记忆,I m(ain)猜测你希望确保书写。
您能优化的唯一事情是,将数据从共享记忆中获取到您自己的地址空间需要多长时间,因为页数与座数相匹配。
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