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When i use "sudo fs_usage -w -f diskio" in terminal to show disk call status, the call column show something like this: PgIn[ST3P], PgIn[AT3UP], PgIn[S], PgIn[AT1], WrMeta[A], PgIn[AT3U], RdData[ANT3U], RdMeta[ST2], RdMeta[ST3UP], WrData[AT1], ...

What does that mean?

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From the fs_usage man page:

CALL The name of the network or filesystem related call, page-in, page-out, or physical disk access.

PgIn and PgOut are page-in and page-out.
RdMeta and WrMeta are reading and writing file metadata.
RdData and WrData are reading and writing to the file.

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    Thanks :) , and what is meaning about "AT1", "AT3UP" ...? Is there some document to describe them?
    – aliasw
    Sep 22 '17 at 9:48
  • @aliasw I don’t know but perhaps someone else does, I guess internal references
    – grg
    Sep 26 '17 at 7:57

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