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Temporary files: RAM or disk?Temporary files: RAM or disk?Posted Jun 4, 2012 21:25 UTC (Mon) by giraffedata (subscriber, #1954)In reply to: Temporary files: RAM or disk? by dlang Parent article: Temporary files: RAM or disk?
current filesystems attempt to schedule data to be written to disk within about 5 seconds or so in most cases Are you sure? The last time I looked at this was ten years ago, but at that time there were two main periods: every 5 seconds kswapd checked for dirty pages old enough to be worth writing out and "old enough" was typically 30 seconds. That was easy to confirm on a personal computer, because 30 seconds after you stopped working, you'd see the disk light flash. But I know economies change, so I could believe dirty pages don't last more than 5 seconds in modern Linux and frequently updated files just generate 6 times as much I/O.
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Temporary files: RAM or disk? Posted Jun 4, 2012 23:11 UTC (Mon) by dlang (✭ supporter ✭, #313) [Link]
this is a filesystem specific time setting for the filesystem journal. I know it's ~5 seconds on ext3. it could be different on other filesystems.
also, this is for getting the journal data to disk, if the journal is just metadata it may not push the file contents to disk (although it may, to prevent the file from containing blocks that haven't been written to yet and so contain random, old data)
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