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What is the performance of the contact command or its corresponding system calls?

In a custom, custom node JS web server (running on Linux), I can dynamically generate dynamic thumbnails in order to lock and track these thumbnails in the file system when it actually uses. If they were not used for a certain period of time (saying a year), I would consider them, "orphans" and delete them.

For this purpose, I have touched them as each time when they are requested by a customer so that I can use the change time to check when they were used last.

I assume that on the web server in high load situations, there would be a significant performance on the web server, as it is an "unnecessary" file system writing value, while in addition to logging only most requirements consist of reads.

Does anyone have benchmarks, how big an impact this could have, and when it's worth it?

1 Answer 1

It's probably not great, and probably is worth avoiding the update each when you open a file. This is why the relatim / noatim mount options were invented to prevent the existing UNIX access time timestamp from being updated each time a file has been opened.

Is your file system mounted with relatime? This updates the anime at most once a day when the file is open (also for reading). The other mounting option usual on Linux is NOATIME: NEVER update ATIME.

If you can not afford the kernel without you doing so without any additional system calls, it may be better that a FSTAT system call calls after opening the file, and only touching the MOD time time Update if the mod clock is older than a day or a week. (They are worried about intervals of a year, so a week is okay.) d. H. Implement the relatime logic manually, but for mod-time.

Frequently accessible files do not need updates (and they still make a system call for you plus a date comparison). Rarely accessible files require a different system call and a metadata writing. If most accesses in your access pattern are repeatedly to a small set of files, this should be awarded.

Possible reasons to be unable to be unable to be able to include the following:

  • The file system is mounted with noatime, and it is not worth changing that changes
  • The files are sometimes read by something other than your web server / CGI setup. (eg a backup job, which compares more than with size / timestamps)

Of course, the other option for does not update timestamps is on use, and simply leave a thumbnail after being regenerated a miniature amount after your weekly cron job has deleted it. That could be fine, depending on your workload.

If you touch some of the "hottest" thumbnails manually, so you can stumble your deletion, rather than having a big load tip next year, you could be fine. And / or let your Deleter files very slowly walk their file system, so they have no big batch often needed thumbnails that were deleted simultaneously.

You could stay in cache in the week before the bi-annual cleanup of mod-time updates, so that the thumbnails remain hot with them. But probably better, only FSTAT / CHECK / UPDATE all the time, because that should not be too much extra burden.

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