class="highlight-chroma"><span class="highlight-line"><span class="highlight cl">在root目录下mkdir docker_test 在此目录下创建Dockerfile span>span><span class="highlight-line"><span class="highlight-cl">vi Dockerfile ker中) span>span>

<span class="highlight-line"><span class="highlight cl">FROM golang:1.9.1 span>span><span class="highlight-line"><span class="highlight-cl"> class="highlight-cl"> span>span><span class="highlight-line"><span class="highlight-cl"># Install beego an  the bee dev tool* span>span><span class="highlight-line"><span class="highlight-cl">RUN go get

cpu 的线程

<span class="highlight-line"><span class="highlight cl">ps -mp pid -o THREAD,tid,time span>span>

发现 cpu 几乎全被一个线程占用了，将线程 id 转换成 16 进制

oma"><span class="highlight-line"><span class="highlight cl">printf "%x\n" tid span>span>

打印线程堆栈信息

<span class="highlight-line"><span class="highlight class="highlight cl">jstack pid |grep tid -A 30 span>span>

看到的结果居然是，CMS 垃圾收集器的线程。。。
这，这，这不科学。

垃圾回收

看垃圾回收日志，发现一直在进行 Full GC，但是几乎没啥效果，GC 完了，老年代依然是几乎 满的状态。

pool, ctx); unifex::sync_wait(std::move(task)); return 0; }unifex::task async_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName) std::printf("Average word length in %s is %g\n", args[i], mean); } }unifex::task async_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName) std::printf("Average word length in %s is %g\n", args[i], mean); } }unifex::task async_main(unifex::span args, auto &pool, auto &io) { auto jobs = args | views::transform( [io](fs::path fileName)

concrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span); 12 . 11Copyright Jason Turner @le�icus emptycrate.com/idocpp A Generic Function Signature concrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span); What should this placeholder Type be? 12 . 11Copyright Jason Turner @le�icus emptycrate concrete function (not a template) that can take any number of parameters. 1 Type generic_function(std::span); What should this placeholder Type be? It needs to be able to hold all of the types we care

quads. So, to mark span text correctly, its quad must be recovered from the data contained in the line and span dictionary. Do this with the following utility function (new in v1.18.9): span_quad = fitz.r recover_quad(line["dir"], span) annot = page.add_highlight_annot(span_quad) # this will mark the complete span text If you want to mark the complete line or a subset of its spans in one go, use the following above may specify any sub-list of line["spans"]. In the example above, the second to second- to-last span are marked. If omitted, the complete line is taken. 10.10 How to Analyze Font Characteristics To

针对性改进，以期与垃圾回收器更好协作。 核心：自主管理，缓存复用，无锁分配。 page, span. 内存管理以页为基本单位，多个地址连续 页构成内存块。 VA 8K 8K 8K 8K 8K span1 span2 small, large. 以 32KB 为界，将对象分成大小两类。 span page object object object small large object 8 16 ... span 3 等⻓长切分 6 8 1 size [1] [2] ... class heap, central, cache. 三级管理机构。 heap central[1] cache cache 向 OS 申请内存。 管理空闲 span。 每个对应⼀一种 sizeclass。 从 heap 获取 span，切分。 管理未全部回收的 管理未全部回收的 span。 从 central 获取 span。 与线程绑定，⽆无锁分配。 ... ... central[n] lock lock lock free init. 算法依赖连续地址，预留较大地址空间。 VA 128GB arena ⽤用户内存分配区域 8GB bitmap 垃圾回收标记区域 128MB spans 块记录区域 ------------

accessor for an Vector called vs: Span vs() { return mbuf->vs; } Stroustrup - "Primitive" - CppCon 2020 14 std::string Flat::String Flat::Span Message descriptor User code access access type initializer type placement new flat type a Span is a range of elementsType mapping • Initializer types: ordinary types to initialize objects in the buffer • char, int32_t, uint32_t, … TimeStamp • char, int32_t, uint32_t, … • Flat::Span, Flat::Span_ref Stroustrup - "Primitive" - CppCon 2020 15 std::string Flat::String Flat::Span User code Message descriptorThe first

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