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PGXC_AIO_RESOURCE_POOL_STATS

PGXC_AIO_RESOURCE_POOL_STATS queries the status of the asynchronous I/O resource pool usage for all nodes in the cluster. This includes the node name, the name of the asynchronous I/O resource type, the number of asynchronous I/O resources in use, and the number of idle asynchronous I/O resources. This view is supported only by clusters of version 9.1.0.100 or later.

Table 1 PGXC_AIO_RESOURCE_POOL_STATS columns

Column

Type

Description

node_name

Text

Node name.

resource_name

Text

Asynchronous I/O resource type. The options are:

  • ASYNC_CONTEXT_TYPE: Asynchronous context resource in the FPT (Future-Promise-Then) framework, at the thread level.
  • DISK_CACHE_CACHE_BLOCK_TYPE: Instance of disk cache granularity block.
  • DISK_CACHE_PATH_MANAGER_TYPE: Cache path manager in the disk cache, at the thread level.
  • FUTURE_STATE_TYPE: Shared state FutureState of Future and Promise in the FPT framework.
  • FUTURE_TYPE: Future in the FPT framework, which provides a non-blocking way to get the result of an asynchronous task.
  • OBS_GET_IO_SCHEDULER_PERIODIC_STATS_SYSTEM_MESSAGE_TYPE: System message of type pgxc_obs_io_scheduler_periodic_stats in the asynchronous scheduling module statistics view.
  • OBS_IO_REQUEST_TYPE: I/O request in the asynchronous scheduling module.
  • OBS_IO_STATS_SYSTEM_MESSAGE_TYPE: System message of the pgxc_obs_io_scheduler_stats view in the asynchronous scheduling statistics module.
  • OBS_MANAGE_PRIORITY_SYSTEM_MESSAGE_TYPE: System message used to adjust priority in the asynchronous scheduling module.
  • OBS_SYSTEM_MESSAGE_TYPE: System message in the asynchronous scheduling module.
  • OBS_VFILE_TYPE: Virtual file in OBS, OBS read/write handle.
  • READ_SEGMENT_TYPE: Entity that merges multiple OBS read requests.
  • SHARED_OBS_HANDLE_TYPE: OBS Handler resource used to connect to the OBS service.
  • SHARED_VAR_AUTO_GUARD_TYPE: Thread-level resource that manages OBS Handler and cached OBS file streams.

busy_num

bigint

Number of asynchronous I/O resources in use.

idle_num

bigint

Number of idle asynchronous I/O resources.

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postgres=# select * from PGXC_AIO_RESOURCE_POOL_STATS;
  node_name   |                      resource_name                      | busy_num | idle_num
--------------+---------------------------------------------------------+----------+----------
 cn_5001      | ASYNC_CONTEXT_TYPE                                      |        0 |        1
 cn_5001      | DISK_CACHE_CACHE_BLOCK_TYPE                             |        0 |        0
 cn_5001      | DISK_CACHE_PATH_MANAGER_TYPE                            |       24 |        0
 cn_5001      | FUTURE_STATE_TYPE                                       |        0 |        2
 cn_5001      | FUTURE_TYPE                                             |        0 |        1
 cn_5001      | OBS_GET_IO_SCHEDULER_PERIODIC_STATS_SYSTEM_MESSAGE_TYPE |        0 |        0
 cn_5001      | OBS_IO_REQUEST_TYPE                                     |        0 |        1
 cn_5001      | OBS_IO_STATS_SYSTEM_MESSAGE_TYPE                        |        0 |        0
 cn_5001      | OBS_MANAGE_PRIORITY_SYSTEM_MESSAGE_TYPE                 |        0 |        0
 cn_5001      | OBS_SYSTEM_MESSAGE_TYPE                                 |        0 |        0
 cn_5001      | OBS_VFILE_TYPE                                          |        0 |        0
 cn_5001      | READ_SEGMENT_TYPE                                       |        0 |        0
 cn_5001      | SHARED_OBS_HANDLE_TYPE                                  |        0 |        0
 cn_5001      | SHARED_VAR_AUTO_GUARD_TYPE                              |        0 |        0
 dn_6001_6002 | ASYNC_CONTEXT_TYPE                                      |        0 |        1
 dn_6001_6002 | DISK_CACHE_CACHE_BLOCK_TYPE                             |      719 |        0
 dn_6001_6002 | DISK_CACHE_PATH_MANAGER_TYPE                            |       25 |        1
 dn_6001_6002 | FUTURE_STATE_TYPE                                       |      719 |        2
 dn_6001_6002 | FUTURE_TYPE                                             |        0 |       39
 dn_6001_6002 | OBS_GET_IO_SCHEDULER_PERIODIC_STATS_SYSTEM_MESSAGE_TYPE |        0 |        0
 dn_6001_6002 | OBS_IO_REQUEST_TYPE                                     |        0 |        3
 dn_6001_6002 | OBS_IO_STATS_SYSTEM_MESSAGE_TYPE                        |        0 |        0
 dn_6001_6002 | OBS_MANAGE_PRIORITY_SYSTEM_MESSAGE_TYPE                 |        0 |        0
 dn_6001_6002 | OBS_SYSTEM_MESSAGE_TYPE                                 |        0 |        0
 dn_6001_6002 | OBS_VFILE_TYPE                                          |        0 |       16
 dn_6001_6002 | READ_SEGMENT_TYPE                                       |        0 |        2
 dn_6001_6002 | SHARED_OBS_HANDLE_TYPE                                  |        0 |        1
 dn_6001_6002 | SHARED_VAR_AUTO_GUARD_TYPE                              |        0 |        1
 dn_6003_6004 | ASYNC_CONTEXT_TYPE                                      |        0 |        1
 dn_6003_6004 | DISK_CACHE_CACHE_BLOCK_TYPE                             |      715 |        0
 dn_6003_6004 | DISK_CACHE_PATH_MANAGER_TYPE                            |       25 |        1
 dn_6003_6004 | FUTURE_STATE_TYPE                                       |      715 |        2
 dn_6003_6004 | FUTURE_TYPE                                             |        0 |       39
 dn_6003_6004 | OBS_GET_IO_SCHEDULER_PERIODIC_STATS_SYSTEM_MESSAGE_TYPE |        0 |        0
 dn_6003_6004 | OBS_IO_REQUEST_TYPE                                     |        0 |        3
 dn_6003_6004 | OBS_IO_STATS_SYSTEM_MESSAGE_TYPE                        |        0 |        0
 dn_6003_6004 | OBS_MANAGE_PRIORITY_SYSTEM_MESSAGE_TYPE                 |        0 |        0
 dn_6003_6004 | OBS_SYSTEM_MESSAGE_TYPE                                 |        0 |        0
 dn_6003_6004 | OBS_VFILE_TYPE                                          |        0 |       16
 dn_6003_6004 | READ_SEGMENT_TYPE                                       |        0 |        2
 dn_6003_6004 | SHARED_OBS_HANDLE_TYPE                                  |        0 |        1
 dn_6003_6004 | SHARED_VAR_AUTO_GUARD_TYPE                              |        0 |        1
(42 rows)
Parent topic: System Views