queued_spin_lock_slowpath

b'queued_spin_lock_slowpath' 是一个用于多线程同步的锁机制，具体实现方式为 队列自旋锁慢路径。其原理是在锁被占用时，将线程加入一个等待队列中自旋等待锁的释放。当锁被释放时，等待队列中的线程会竞争该锁。如果竞争成功，则执行对应的操作；如果竞争失败，则重新加入等待队列自旋等待。这种锁机制适用于多线程间并发执行的情况，可有效降低锁的争用程度，提高系统的并发能力。

相关问题

mysqld_exporter监控指标列表

MySQL Exporter 是一个监控 MySQL 数据库的工具，可以将 MySQL 的监控指标暴露为 Prometheus 可以抓取的格式。以下是 MySQL Exporter 可以监控的指标列表：

- mysql_active_threads
- mysql_bytes_received
- mysql_bytes_sent
- mysql_commands_total
- mysql_connections_aborted
- mysql_connections_total
- mysql_created_tmp_disk_tables
- mysql_created_tmp_files
- mysql_created_tmp_tables
- mysql_flush_commands
- mysql_innodb_active_transactions
- mysql_innodb_buffer_pool_bytes_data
- mysql_innodb_buffer_pool_bytes_dirty
- mysql_innodb_buffer_pool_pages_data
- mysql_innodb_buffer_pool_pages_dirty
- mysql_innodb_buffer_pool_pages_flushed
- mysql_innodb_buffer_pool_pages_free
- mysql_innodb_buffer_pool_pages_misc
- mysql_innodb_buffer_pool_pages_total
- mysql_innodb_buffer_pool_read_ahead
- mysql_innodb_buffer_pool_read_ahead_evicted
- mysql_innodb_buffer_pool_read_requests
- mysql_innodb_buffer_pool_reads
- mysql_innodb_buffer_pool_wait_free
- mysql_innodb_buffer_pool_write_requests
- mysql_innodb_checkpoint_age
- mysql_innodb_current_row_locks
- mysql_innodb_data_fsyncs
- mysql_innodb_data_pending_fsyncs
- mysql_innodb_data_pending_reads
- mysql_innodb_data_pending_writes
- mysql_innodb_data_read
- mysql_innodb_data_reads
- mysql_innodb_data_written
- mysql_innodb_dblwr_pages_written
- mysql_innodb_dblwr_writes
- mysql_innodb_deadlocks
- mysql_innodb_history_list_length
- mysql_innodb_ibuf_free_list
- mysql_innodb_ibuf_merged
- mysql_innodb_ibuf_merges
- mysql_innodb_ibuf_size
- mysql_innodb_log_waits
- mysql_innodb_log_write_requests
- mysql_innodb_log_writes
- mysql_innodb_lsn_current
- mysql_innodb_lsn_flushed
- mysql_innodb_lsn_last_checkpoint
- mysql_innodb_mem_adaptive_hash
- mysql_innodb_mem_dictionary
- mysql_innodb_mem_total
- mysql_innodb_mutex_os_waits
- mysql_innodb_mutex_spin_rounds
- mysql_innodb_mutex_spin_waits
- mysql_innodb_num_open_files
- mysql_innodb_num_open_files_hist
- mysql_innodb_os_log_fsyncs
- mysql_innodb_os_log_pending_fsyncs
- mysql_innodb_os_log_pending_writes
- mysql_innodb_os_log_written
- mysql_innodb_pages_created
- mysql_innodb_pages_read
- mysql_innodb_pages_written
- mysql_innodb_pending_aio_log_ios
- mysql_innodb_pending_aio_sync_ios
- mysql_innodb_pending_buffer_pool_flushes
- mysql_innodb_pending_checkpoint_writes
- mysql_innodb_pending_ibuf_aio_reads
- mysql_innodb_pending_log_flushes
- mysql_innodb_pending_log_writes
- mysql_innodb_pending_normal_aio_reads
- mysql_innodb_pending_normal_aio_writes
- mysql_innodb_queries_inside
- mysql_innodb_queries_queued
- mysql_innodb_read_views
- mysql_innodb_rows_deleted
- mysql_innodb_rows_inserted
- mysql_innodb_rows_read
- mysql_innodb_rows_updated
- mysql_innodb_s_lock_os_waits
- mysql_innodb_s_lock_spin_rounds
- mysql_innodb_s_lock_spin_waits
- mysql_innodb_sem_waits
- mysql_innodb_sem_wait_time_ms
- mysql_innodb_tables_in_use
- mysql_innodb_x_lock_os_waits
- mysql_innodb_x_lock_spin_rounds
- mysql_innodb_x_lock_spin_waits
- mysql_max_used_connections
- mysql_open_files
- mysql_open_streams
- mysql_open_tables
- mysql_opened_tables
- mysql_prepared_stmt_count
- mysql_qcache_free_blocks
- mysql_qcache_free_memory
- mysql_qcache_hits
- mysql_qcache_inserts
- mysql_qcache_lowmem_prunes
- mysql_qcache_not_cached
- mysql_qcache_queries_in_cache
- mysql_qcache_total_blocks
- mysql_queries
- mysql_questions
- mysql_select_full_join
- mysql_select_full_range_join
- mysql_select_range
- mysql_select_range_check
- mysql_select_scan
- mysql_slave_lag_seconds
- mysql_slow_queries
- mysql_sort_merge_passes
- mysql_sort_range
- mysql_sort_rows
- mysql_sort_scan
- mysql_table_locks_immediate
- mysql_table_locks_waited
- mysql_table_open_cache_hits
- mysql_table_open_cache_misses
- mysql_table_open_cache_overflows
- mysql_threadpool_idle_threads
- mysql_threadpool_threads
- mysql_threads_cached
- mysql_threads_connected
- mysql_threads_created
- mysql_threads_running

上述指标可以帮助你监控 MySQL 数据库的性能和状态，例如连接数、查询数、缓存命中率、锁等待情况、InnoDB 的缓存和 IO 操作等。

labview_qmh架构和dqmh框架

LabVIEW QMH架构（Queued Message Handler）和DQMH框架（Delacor Queued Message Handler）是LabVIEW中常用的架构和框架。

LabVIEW QMH架构是一种基于消息队列的架构，旨在提高程序的可扩展性和可维护性。该架构将程序分解为多个独立的模块（或子VI），每个模块之间通过消息进行通信。模块之间的消息传递通过队列实现，从而实现了模块之间的解耦和并发执行。这种架构能够有效地处理多个任务同时进行的情况，提高程序的响应速度和效率。

DQMH框架是基于LabVIEW QMH架构的扩展和封装，由Delacor开发并提供。它提供了一套开箱即用的工具和模板，帮助开发人员更快地构建复杂的LabVIEW应用程序。与传统的QMH架构相比，DQMH框架提供了更多的功能和抽象，例如自动创建消息队列、模块注册和注销，以及事件驱动的编程模型等。此外，DQMH框架还提供了许多实用的工具和管理器，用于简化程序的调试和维护。

总的来说，LabVIEW QMH架构和DQMH框架都是为了提高LabVIEW程序的可扩展性、可维护性和复用性而设计的。它们通过消息队列实现模块之间的解耦和并发执行，使程序更加稳定和响应快速。而DQMH框架在此基础上提供了更多的功能和工具，帮助开发人员更容易地构建复杂的LabVIEW应用程序。