update DAOS README
Signed-off-by: Mohamad Chaarawi <mohamad.chaarawi@intel.com>master
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README_DAOS
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README_DAOS
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@ -25,11 +25,10 @@ Driver specific options are specified at the end after "--". For example:
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ior -a DAOS [ior_options] -- [daos_options]
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ior -a DAOS [ior_options] -- [daos_options]
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In the IOR options, the file name should be specified as a container uuid using
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In the IOR options, the file name should be specified as a container uuid using
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"-o <container_uuid>". If the "-E" option is given, then this UUID
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"-o <container_uuid>". If the "-E" option is given, then this UUID shall denote
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shall denote an existing container created by a "matching" IOR
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an existing container created by a "matching" IOR run. Otherwise, IOR will
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run. Otherwise, IOR will create a new container with this UUID.
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create a new container with this UUID. In the latter case, one may use
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In the latter case, one may use uuidgen(1) to generate the UUID
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uuidgen(1) to generate the UUID of the new container.
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of the new container.
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The DAOS options include:
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The DAOS options include:
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@ -50,15 +49,18 @@ Optional Options:
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-k : flag to kill a rank during IO
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-k : flag to kill a rank during IO
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-o <object_class>: specific object class
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-o <object_class>: specific object class
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When benchmarking write performance, one likely do not want
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When benchmarking write performance, one likely does not want "-W", which causes
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"-W", which causes the write phase to do one additional memory
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the write phase to do one additional memory copy for every I/O. This is due to
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copy for every I/O. This is due to IOR's assumption that when a
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IOR's assumption that when a DAOS_Xfer() call returns the buffer may be
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DAOS_Xfer() call returns the buffer may be released. Therefore,
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released. Therefore, random data is written when "-W" is absent, while data is
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random data is written when "-W" is absent, while data is copied
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copied from IOR buffers when "-W" is present.
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from IOR buffers when "-W" is present.
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See doc/USER_GUIDE for all options and directives. Note that not
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See doc/USER_GUIDE for all options and directives. Note that not all
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all combinations of options are supported.
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combinations of options are supported. For example specifying an epoch to access
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and running ior with multiple iterations would cause all iterations other than
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first one to fail because the epoch will be committed in the first iteration. In
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that case, the epoch should not be specified and the DAOS driver would choose
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the epoch to access automatically on each iteration.
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Examples that should work include:
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Examples that should work include:
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