Hi,

I came across this DAOS object open mode enum.  Will you support DAOS_OO_IO_RAND and DAOS_OO_IO_SEQ? How much performance gain we can get for random and sequential access respectively?

/** Object open modes */

enum {

              /** Shared read */

              DAOS_OO_RO             = (1 << 1),

              /** Shared read & write, no cache for write */

              DAOS_OO_RW             = (1 << 2),

              /** Exclusive write, data can be cached */

              DAOS_OO_EXCL           = (1 << 3),

              /** unsupported: random I/O */

              DAOS_OO_IO_RAND        = (1 << 4),

              /** unsupported: sequential I/O */

              DAOS_OO_IO_SEQ         = (1 << 5),

};

Thanks.

Hi Jiafu,

Those flags are placeholders for potential future optimizations (e.g. readahead, client-side aggregation, …) by allowing the application to give us a hint on the expected workload. They are not used currently, so you won’t see any difference if you pass them.

Cheers,

Johann

Hi,

I came across this DAOS object open mode enum.  Will you support DAOS_OO_IO_RAND and DAOS_OO_IO_SEQ? How much performance gain we can get for random and sequential access respectively?

/** Object open modes */

enum {

              /** Shared read */

              DAOS_OO_RO             = (1 << 1),

              /** Shared read & write, no cache for write */

              DAOS_OO_RW             = (1 << 2),

              /** Exclusive write, data can be cached */

              DAOS_OO_EXCL           = (1 << 3),

              /** unsupported: random I/O */

              DAOS_OO_IO_RAND        = (1 << 4),

              /** unsupported: sequential I/O */

              DAOS_OO_IO_SEQ         = (1 << 5),

};

Thanks.

Thanks, Johann.