交叉编译 ring 这种非 pure Rust 项目需要对应的 cc 工具链，报错这么明显告诉你 x86_64-linux-gnu-gcc: No such file

@murmur
你以为微信的脑残设计是技术问题？你以为微信的技术比你差？

cargo -Z build-std=std,panic_abort -Z build-std-features=panic_immediate_abort build

@ElmerZhang 百度一下分组加密的 padding

(i**2 for i in l)：

l 是创建生成器时闭包捕获的，i ** 2 是 f.next() 时计算的

***

(l[i] for i in range(2))：

闭包没有捕获任何变量，计算 l[i] 时从外部作用域获取 l

***

两个表达式对应的 opcode ，注意看 LOAD opcode

```
2 8 LOAD_NAME 1 (list)
10 LOAD_CONST 1 (<code object <genexpr> at 0x10256d3a0, file "<dis>", line 2>)
12 LOAD_CONST 2 ('<genexpr>')
14 MAKE_FUNCTION 0
16 LOAD_NAME 0 (l)
18 GET_ITER
20 CALL_FUNCTION 1
22 CALL_FUNCTION 1
24 POP_TOP

3 26 LOAD_NAME 1 (list)
28 LOAD_CONST 3 (<code object <genexpr> at 0x10256d450, file "<dis>", line 3>)
30 LOAD_CONST 2 ('<genexpr>')
32 MAKE_FUNCTION 0
34 LOAD_NAME 2 (range)
36 LOAD_CONST 4 (2)
38 CALL_FUNCTION 1
40 GET_ITER
42 CALL_FUNCTION 1
44 CALL_FUNCTION 1
46 POP_TOP
48 LOAD_CONST 5 (None)
50 RETURN_VALUE

Disassembly of <code object <genexpr> at 0x10256d3a0, file "<dis>", line 2>:
2 0 LOAD_FAST 0 (.0)
>> 2 FOR_ITER 14 (to 18)
4 STORE_FAST 1 (i)
6 LOAD_FAST 1 (i)
8 LOAD_CONST 0 (2)
10 BINARY_POWER
12 YIELD_VALUE
14 POP_TOP
16 JUMP_ABSOLUTE 2
>> 18 LOAD_CONST 1 (None)
20 RETURN_VALUE

Disassembly of <code object <genexpr> at 0x10256d450, file "<dis>", line 3>:
3 0 LOAD_FAST 0 (.0)
>> 2 FOR_ITER 14 (to 18)
4 STORE_FAST 1 (i)
6 LOAD_GLOBAL 0 (l)
8 LOAD_FAST 1 (i)
10 BINARY_SUBSCR
12 YIELD_VALUE
14 POP_TOP
16 JUMP_ABSOLUTE 2
>> 18 LOAD_CONST 0 (None)
20 RETURN_VALUE

```

应该是 A 那边提前维护了 TCP 链接池。

如果按楼上说的，直接要账号密码写脚本抢不就行了，有什么必要让不懂技术的人设代理。

开眼了，有觉得网络传输要字段对齐的，有觉得压缩算法一定能压缩到比原始数据小的，有觉得缩减 json 字段名长度没用的。

大多数语言的宏都是正则序，先展开，后求值

Rust top 10 stars ，deno 85K 排第一，rust-lang/rust 71K 排第二 ... 我想笑

QT 。

@theohateonion #21 @zhailei2011 #30 @elechi #34
一个人 typo ，两个人复制粘贴

至于为什么 gin 可以，因为它根本没做这个优化

16 年有人发过 pr ( https://github.com/gin-gonic/gin/pull/638)，但不知道什么原因关闭了，一直到今天都没实现这个优化



```go
// gin
8 0x000000000054620e in net.(*TCPConn).Write
at <autogenerated>:1
9 0x00000000005de533 in net/http.checkConnErrorWriter.Write
at d:/go/src/net/http/server.go:3532
10 0x0000000000592e75 in bufio.(*Writer).Write
at d:/go/src/bufio/bufio.go:639
11 0x00000000005d2695 in net/http.(*chunkWriter).Write
at d:/go/src/net/http/server.go:383
12 0x0000000000592e75 in bufio.(*Writer).Write
at d:/go/src/bufio/bufio.go:639
13 0x00000000005d819e in net/http.(*response).write
at d:/go/src/net/http/server.go:1592
14 0x00000000005d7ed0 in net/http.(*response).Write
at d:/go/src/net/http/server.go:1550
15 0x00000000006f3078 in github.com/gin-gonic/gin.(*responseWriter).Write
at c:/users/eddisonwang/go/pkg/mod/github.com/gin-gonic/[email protected]/response_writer.go:78
16 0x0000000000452444 in io.copyBuffer
at d:/go/src/io/io.go:425
17 0x00000000004520fa in io.Copy
at d:/go/src/io/io.go:382
18 0x00000000004520fa in io.CopyN
at d:/go/src/io/io.go:358
19 0x00000000005b2ba5 in net/http.serveContent
at d:/go/src/net/http/fs.go:337
20 0x00000000005b4af5 in net/http.serveFile
at d:/go/src/net/http/fs.go:664




// std http
6 0x0000000000f0ed5c in net.sendFile
at d:/go/src/net/sendfile_windows.go:37
7 0x0000000000f1196e in net.(*TCPConn).readFrom
at d:/go/src/net/tcpsock_posix.go:52
8 0x0000000000f10f76 in net.(*TCPConn).ReadFrom
at d:/go/src/net/tcpsock.go:104
9 0x0000000000fa08d9 in net/http.(*response).ReadFrom
at d:/go/src/net/http/server.go:597
10 0x0000000000e65a8b in io.copyBuffer
at d:/go/src/io/io.go:409
11 0x0000000000e657fa in io.Copy
at d:/go/src/io/io.go:382
12 0x0000000000e657fa in io.CopyN
at d:/go/src/io/io.go:358
13 0x0000000000f80465 in net/http.serveContent
at d:/go/src/net/http/fs.go:337
14 0x0000000000f823b5 in net/http.serveFile
at d:/go/src/net/http/fs.go:664
```

http.FileServer 在 Windows 的最底层调用 TransmitFile ( https://github.com/golang/go/blob/master/src/internal/poll/sendfile_windows.go#L61)

TransmitFile 在个人机限制并发数为 2 ，服务器无限制 ( https://docs.microsoft.com/en-us/windows/win32/api/mswsock/nf-mswsock-transmitfile#remarks)

> Workstation and client versions of Windows optimize the TransmitFile function for minimum memory and resource utilization by limiting the number of concurrent TransmitFile operations allowed on the system to a maximum of two. On Windows Vista, Windows XP, Windows 2000 Professional, and Windows NT Workstation 3.51 and later only two outstanding TransmitFile requests are handled simultaneously; the third request will wait until one of the previous requests is completed.

Server versions of Windows optimize the TransmitFile function for high performance. On server versions, there are no default limits placed on the number of concurrent TransmitFile operations allowed on the system. Expect better performance results when using TransmitFile on server versions of Windows. On server versions of Windows, it is possible to set a limit on the maximum number of concurrent TransmitFile operations by creating a registry entry and setting a value for the following REG_DWORD:

HKEY_LOCAL_MACHINE\CurrentControlSet\Services\AFD\Parameters\MaxActiveTransmitFileCount

整个 goroutine 匿名函数被优化掉了
0x0045 00069 (.\t.go:8) MOVQ "".&x+24(SP), AX
0x004a 00074 (.\t.go:8) INCQ (AX)

@yitalin #38
态度还挺冲，逗笑我了

先搜搜 idmmkb.dll 是啥，一群人在这不过脑子的人云亦云

看来不少开发想转安全

静态编译和 RAM ROM 有啥关系

那就`sc delete edgeupdate`吧