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This list is * only maintained by the metadata cache on process 0 -- it * it used to maintain a view of the dirty entries as seen * by the other caches, so as to keep the dirty bytes count * in synchronization with them. * * Thus on process 0, the dirty_bytes count is incremented * only if either * * 1) an entry is inserted in the metadata cache, or * * 2) a previously clean entry is moved, and it does not * already appear in the dirty entry list, or * * 3) a previously clean entry is unprotected with the * dirtied flag set and the entry does not already appear * in the dirty entry list. * * Entries are added to the dirty entry list whever they cause * the dirty bytes count to be increased. They are removed * when they appear in a clean entries broadcast. Note that * moves must be reflected in the dirty entry list. * * To reitterate, this field is only used on process 0 -- it * should be NULL on all other processes. * * d_slist_len: Integer field containing the number of entries in the * dirty entry list. This field should always contain the * value 0 on all processes other than process 0. It exists * primarily for sanity checking. * * c_slist_ptr: Pointer to an instance of H5SL_t used to maintain a list * of entries that were dirty, have been flushed * to disk since the last clean entries broadcast, and are * still clean. Since only process 0 can write to disk, this * list only exists on process 0. * * In essence, this slist is used to assemble the contents of * the next clean entries broadcast. The list emptied after * each broadcast. * * c_slist_len: Integer field containing the number of entries in the clean * entries list (*c_slist_ptr). This field should always * contain the value 0 on all processes other than process 0. * It exists primarily for sanity checking. * * The following two fields are used only when metadata_write_strategy * is H5AC_METADATA_WRITE_STRATEGY__DISTRIBUTED. * * candidate_slist_ptr: Pointer to an instance of H5SL_t used by process 0 * to construct a list of entries to be flushed at this sync * point. This list is then broadcast to the other processes, * which then either flush or mark clean all entries on it. * * candidate_slist_len: Integer field containing the number of entries on the * candidate list. It exists primarily for sanity checking. * * write_done: In the parallel test bed, it is necessary to ensure that * all writes to the server process from cache 0 complete * before it enters the barrier call with the other caches. * * The write_done callback allows t_cache to do this without * requiring an ACK on each write. Since these ACKs greatly * increase the run time on some platforms, this is a * significant optimization. * * This field must be set to NULL when the callback is not * needed. * * Note: This field has been extended for use by all processes * with the addition of support for the distributed * metadata write strategy. * JRM -- 5/9/10 * * sync_point_done: In the parallel test bed, it is necessary to verify * that the expected writes, and only the expected writes, * have taken place at the end of each sync point. * * The sync_point_done callback allows t_cache to perform * this verification. The field is set to NULL when the * callback is not needed. * ****************************************************************************/ #ifdef H5_HAVE_PARALLEL #define H5AC__H5AC_AUX_T_MAGIC (unsigned)0x00D0A01 typedef struct H5AC_aux_t { uint32_t magic; MPI_Comm mpi_comm; int mpi_rank; int mpi_size; hbool_t write_permitted; int32_t dirty_bytes_threshold; int32_t dirty_bytes; int32_t metadata_write_strategy; #if H5AC_DEBUG_DIRTY_BYTES_CREATION int32_t dirty_bytes_propagations; int32_t unprotect_dirty_bytes; int32_t unprotect_dirty_bytes_updates; int32_t insert_dirty_bytes; int32_t insert_dirty_bytes_updates; int32_t move_dirty_bytes; int32_t move_dirty_bytes_updates; #endif /* H5AC_DEBUG_DIRTY_BYTES_CREATION */ H5SL_t * d_slist_ptr; int32_t d_slist_len; H5SL_t * c_slist_ptr; int32_t c_slist_len; H5SL_t * candidate_slist_ptr; int32_t candidate_slist_len; void (* write_done)(void); void (* sync_point_done)(int num_writes, haddr_t * written_entries_tbl); } H5AC_aux_t; /* struct H5AC_aux_t */ #endif /* H5_HAVE_PARALLEL */ #endif /* _H5ACpkg_H */ |
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