jsc::chunk_evenly Range Adaptor for Distributing Work Across Tasks## jsc::chunk_evenly(chunk_count) jsc::chunk_evenly(chunk_count) ## jsc : chunk_evenly — Range adaptor for distributing work across tasks ## Mateusz Zych, Ivo Kabadshow Jülich Supercomputing Centre Jülich, Germany ## How to chunk a sequence?  ## ① Chunk by size ## std::views::chunk(size) ## ② Chunk by count  ## ③ How to chunk & chunk_evenly #includechunk_evenly.hpp=""> #include #include #include 0 码力 | 1 页 | 1.38 MB | 1 年前3- CurveFS对接S3方案设计[Image](/uploads/documents/5/e/0/d/5e0d7dc150901f00ad9cd820cdd864e6/p2_1.jpg) S3ClientAdaptor模块：负责将文件数据进行chunk，以及block的拆分为s3的object，并写入/读取s3的object。S3-allocator模块：负责分配s3-object唯一标识。 ## 整体思路 curvefs对接s3和对接vol 此我们涉及到修改client的流程主要在read/write/flush，以及空间分配申请（s3不需要释放空间，可直接删除对应s3 object） 文件首先会按照chunk进行拆分，每个chunk固定64M/1G（待定），chunk内部会划分为多个block，每个block最大4M，每个block对应s3上一个object。 s3上对象已chunkid_indexblock_version进行 { TYPE_DIRECTORY = 1; TYPE_FILE = 2; TYPE_SYM_LINK = 3; TYPE_S3 = 4; }; // inodes3chunk message S3ChunkInfo { required uint64 chunkId = 1; required uint64 version = 2; required0 码力 | 11 页 | 145.77 KB | 1 年前3
- Adventures in SIMD Thinking (Part 2 of 2)__m128i chunk, half, qrtr, zero; //- SSE "registers" int32_t mask, incr; //- ASCII bit mask and advancement zero = _mm_set1_epi8(0); //- Zero out the interleave register chunk = _mm Load a register with 8-bit values mask = _mm_movemask_epi8(chunk); //- Find the octets with high bit set half = _mm_unpacklo_epi8(chunk, zero); //- Unpack bytes 0-7 into 16-bit words qrtr = _ _mm_storeu_si128(__m128i*) (pDst + 4), qrtr); //- Write to memory half = _mm_unpackhi_epi8(chunk, zero); //- Unpack bytes 8-15 into 16-bit words qrtr = _mm_unpacklo_epi16(half, zero); //- Unpack0 码力 | 135 页 | 551.08 KB | 1 年前3
- What's Eating my RAM?region of memory subdivided into chunks Chunk: a range of memory of various sizes allocated to the application |Kernel| |---| |Stack| || |Heap| |(Chunk)| |Data & Text| ## How does my code impact shared among one or more threads Heap: a contiguous region of memory subdivided into chunks Chunk: a range of memory of various sizes allocated to the application  chunk ## 快照的元数据和数据组织 ## Etcd中的快照元数据: |字段|类型|说明| |---|---|---| |uuid|string|快照唯一Id| |user|string|所属用户| |FileName|string|快照目标卷名| |snapshotName|string|快照名| |seqNum|uint64\_t|快照版本号| |chunkSize|uint32\_t|chunk的size| |segmentSize|uint64\_t|segment的size| |fileLength|uint64\_t|卷的大小| |time|uint64\_t|快照创建时间| |status|enum|快照的创建状态| fileInfo 快照目的卷的卷名等信息 • chunkMap 快照chunk映射表 ## DataObject: • 保存完整的chunk数据，大小为一个Chunk的大小，即16MB ## 增量转储原理： - 打快照时读取当前目标卷的所有快照的全部metaObject - 根据本快照的chunk映射表，判断当前的快照chunk是否需要转储  A named certificate to use for serving HTTPS. --ssl-key SSL key to use for serving HTTPS. --vendor-chunk Use a separate bundle containing only vendor libraries. --vendor-source-map Resolve vendor packages differential loading... ES5 bundle generation complete. chunk {polyfills} polyfills-es2015.js, polyfills-es2015.js.map (polyfills) 141 kB [initial] [rendered] chunk {runtime} runtime-es2015.js, runtime-es2015.js0 码力 | 64 页 | 1.04 MB | 2 年前3 Curve核心组件之mds – 网易数帆PageFileChunkInfo: chunk是数据分片的最小单元。 segment 和 chunk 的关系如下图:
## NAMESERVER Namespace的文件的目录层次关系如右图。 文件的元数据以KV的方式存储。 • Key: ParentID + “/” + BaseName; • Value: 自身的文件ID。一个curve file由若干 segment组成 chunk1 ... ... ... chunk64 segme > chunk65 ... ... ... chunk128 segment2 ... ... ... ... ... ... chunk63N-1 ... ... ... chunk64N segmentN 0 码力 | 23 页 | 1.74 MB | 1 年前3 Back To Basics: Functional Programming in C++composition? Split the list into multiple chunks of increasing numbers. 2 Determine the size of each chunk. 3 Return the maximum. ## Example: Longest contiguous subsequence of increasing numbers std::size_t auto&& rng) { return stdr::max( rng // [1, 3, 2, 4, 5, 7, 6] | stdv::chunk_by(std::less{}) // [[1, 3], [2, 4, 5, 7], [6]] | stdv::transform(stdr::size) // [2, 4 ■ stdv::chunk_by: split the range into chunks where borders don’t satisfy a binary predicate ## Composition shape: Range → range of ranges Input Range Output Range of ranges ■ stdv::chunk_by: split 0 码力 | 178 页 | 918.67 KB | 1 年前3
Tornado 6.1 Documentation
fetch_next_chunk()) while True: chunk = yield fetch_future if chunk is None: break self.write(chunk) fetch_future = convert_yielded(self.fetch_next_chunk()) fetch_future = self.fetch_next_chunk() while True: chunk = yield fetch_future if chunk is None: break self.write(chunk) fetch_future = self.fetch_next_chunk() yield self those methods are called, so the values are available during prepare. RequestHandler.data_received(chunk: bytes) → Optional[Available[None]] [source] Implement this method to handle streamed request data0 码力 | 931 页 | 708.03 KB | 2 年前3共 897 条- 1
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