类似Oracle cbc闩锁的是一种Kingbase的轻量级锁lwlock,这个锁的名字在不同数据库版本中可能有所不同,我们统一称之为buffer_mapping(BufMappingLock),这个轻量级锁用于HASH BUCKET的串行化访问。因为在每个buffer 访问中都需要使用这个锁,因此和Oracle一样,Kingbase采用了分区锁的方式,将整个HASH TABLE分为多个分区(缺省位...
在KingbaseES数据库中,会话在将数据块与共享缓冲池的缓冲区相关联时,会触发“LWLock buffer_mapping”等待事件。 这类事件涉及到一种轻量级锁(lwlock),类似于Oracle中的闩锁。这个锁在不同的数据库中可能有不同的名称,但通常被称为buffer_mapping或BufMappingLock。它主要用于实现对HASH BUCKET的有序访问。在Kingbase...
The shared_buffers parameter sets the shared buffer size and reserves a memory area to store the table and index pages. If you change this parameter, make sure to restart the database. . The LWLock:buffer_mapping wait event occurs in the following scenarios: A process searches the buffer ...
2) mapped buffer 映射(映象)缓冲区3) graph-mapping buffer 图形映射缓冲区4) mapped buffer 映像缓冲5) buffer area 缓冲地区;缓冲区6) buffer cache 缓冲区缓存补充资料:HⅡ区和HⅠ区 见电离氢区和中性氢区。 说明:补充资料仅用于学习参考,请勿用于其它任何用途。
vim.keymap.set('n', '<F6>', ':echo "got F6"<CR>', {buffer = vim.fn.bufnr()}) Pop1() vim.print(vim.inspect(vim.fn.maparg('<F7>'))) vim.print(vim.inspect(vim.fn.maparg('<F6>'))) --vim.print(vim.inspect(vim.fn.maplist())) ...
0 (0) STRUCTURE 0 BFPDSECT START OF BUFFER PREFIX 0 (0) CHARACTER 4 BFPID BUFFER INDENTIFIER 4 (4) SIGNED 4 BFPBAT ADDRESS OF AUXILIARY BUFFER 4 (4) X'4' 0 BFPSWEL "BFPBAT,,C'A'" Address of SWEL (TP buffers in process of signon only) 8 (8) ADDRESS 4 BUFCHAIN BUFFER CHAIN...
BUFFER MAPPING SCHEME INVOLVING PRE-ALLOCATION OF MEMORYThe inventive concept pertains to a computer-implemented method by which an application, an operating system, and hardware communicate with one another. The method entails the application converting an application-level virtual address to a physical...
Depending on the target platform, GPUBuffer mapping may be implemented using one or more buffer allocations. There may be a single allocation which is addressable both by JavaScript and the GPU, or there may be multiple allocations where the WebGPU implementation inserts copies between intermediate ...
+ lockdep_assert_held(&cpu_buffer->mapping_lock); + + subbuf_order = cpu_buffer->buffer->subbuf_order; + subbuf_pages = 1 << subbuf_order; + + nr_subbufs = cpu_buffer->nr_pages + 1; /* + reader-subbuf */ + nr_pages = ((nr_subbufs) << subbuf_order) - pgoff + 1...
+When a mapping is in place on a Tracefs ring-buffer, it is not possible to +either resize it (either by increasing the entire size of the ring-buffer or +each subbuf). It is also not possible to use snapshot and causes splice to copy ...