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开源MQTT网关:EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区,为创新赋能!

...群支持亿级并发连接。但 CPU 和内存使用率更高。EMQX 是如何支持单集群亿级 MQTT 并发连接的?点击查看详细测试过程 →协议支持Mosiquitto 作为 MQTT Broker 提供了完整的 MQTT 3.1/3.1.1/5.0 协议支持,支持协议规范中的遗嘱消息、保留...
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窝窝与众美联合并 新公司命名“众美窝窝” - 资讯 - 清泛网 - 专注C/C++及内核技术

...有其独特的产业链生态,当前O2O领域各方参与者都在探索如何实现对传统生活服务领域的“互联网+”。未来,窝窝如果能将“众美窝窝”的模式复制到其它细分行业,其潜在价值将是无比巨大的。 窝窝 美联 公司
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Numpy first occurrence of value greater than existing value

...on using numba A more general approach would be using a numba function: @nb.njit def first_index_numba(val, arr): for idx in range(len(arr)): if arr[idx] > val: return idx return -1 That will work for any array but it has to iterate over the array, so in the averag...
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Unable to install Maven on Windows: “JAVA_HOME is set to an invalid directory”

...\jdk\bin", then the JAVA_HOME variable needs to point to "E:\Sun\SDK\jdk". NB: JAVA_HOME should NOT end with "\bin"1. Make sure that you haven't put a semicolon in the JAVA_HOME variable2. NB: JAVA_HOME should be a single directory name, not "PATH-like" list of directory names separated by semicolo...
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Cluster analysis in R: determine the optimal number of clusters

...nd-diagnostics-for-cluster-analysis-r-code/ for more details. Eight. The NbClust package provides 30 indices to determine the number of clusters in a dataset. library(NbClust) nb <- NbClust(d, diss=NULL, distance = "euclidean", method = "kmeans", min.nc=2, max.nc=15, index = "...
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Determine a string's encoding in C#

...= 'A' && b[n] <= 'Z'))) { n++; } byte[] nb = new byte[n-oldn]; Array.Copy(b, oldn, nb, 0, n-oldn); try { string internalEnc = Encoding.ASCII.GetString(nb); text = Encoding.GetEncoding(internalEnc).GetString(b)...
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在ATL无窗口ActiveX 控件中如何使用定时器? - 其他 - 清泛IT社区,为创新赋能!

MFC中SetTimer设置定时器、OnTimer时间触发回调函数均是CWnd的成员函数,但前提是必须在有窗口的环境下。 对于ATL无窗口的情况,只能使用原始SetTimer Win32 API函数,如下: 回调函数: VOID CALLBACK TimerProc(     HWND hwnd, ...
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Sql server默认的端口是多少?如何开启远程连接? - 爬虫/数据库 - 清泛IT...

默认是1433,可以在配置管理器中查看: 需要开放1433端口,可以参考《Windows、Linux开放指定端口》。 另外,开启远程连接还需要启用TCP/IP,然后重启服务,步骤如下:
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nsis安装、卸载时如何判断程序是否正在运行 并提示关闭? - 脚本技术 - 清...

;-------------------------------------------------------------- !include logiclib.nsh FindProcDLL::FindProc "Test.exe" StrCmp $R0 1 0 +2 messagebox::show MB_SETFOREGROUND|MB_ICONHAND|MB_DEFBUTTON3|MB_TOPMOST "${PRODUCT_NAME}" "" \         ...