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Apache Spark: The number of cores vs. the number of executors

...acities, yarn.nodemanager.resource.memory-mb and yarn.nodemanager.resource.cpu-vcores, should probably be set to 63 * 1024 = 64512 (megabytes) and 15 respectively. We avoid allocating 100% of the resources to YARN containers because the node needs some resources to run the OS and Hadoop daemons. In ...
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Compiling with g++ using multiple cores

...ge projects quicker (for example 4 source files at a time for a multi-core CPU)? 8 Answers ...
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Volatile vs. Interlocked vs. lock

...at all. The point of volatile is that multiple threads running on multiple CPUs can and will cache data and re-order instructions. If it is not volatile, and CPU A increments a value, then CPU B may not actually see that incremented value until some time later, which may cause problems. If it is vol...
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代码块超过1.2w编译apk报错问题 - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

...不好恢复老版本不验证了) -------- 怀疑 kawa Scheme 生成问题,更新新版本试试。(也不容易更新) https://community.appinventor.mi ... or-d8-failed/141334
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低效程序员的7个坏习惯 - 创意 - 清泛网 - 专注C/C++及内核技术

...le的Charles解释道,“低效的工程师会错误地表征用户体验问题为其他人的问题。” 遗憾的是,似乎很多软件工程师都持有这种态度,这也是为什么企业要寻求能够移情和了解他人问题的代码战士。 “雇主正在竭力寻找那些拥有...
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Generating a unique machine id

...FirmwareTables and GetSystemFirmwareTable. IIRC, the "unique id" from the CPUID instruction is deprecated from P3 and newer. share | improve this answer | follow ...
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c++ volatile关键字简析 - C/C++ - 清泛网 - 专注C/C++及内核技术

c++ volatile关键字简析volatile防范冲突,提高效率。降低CPU Cache Line锁冲突的几率。不同于普通变量在于:CPU缓存中有值的话,也得从内存中重新加载到缓存(普通变量不会);即认为寄存器值不可靠, volatile 防范冲突,提高效...
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C++字符串截断时中文的处理问题(中文被截断怎么处理?) - c++1y / stl - ...

// 防止后台错误消息中汉字双字节被截断出现乱码 if (pRspMsg->RspMsg.buf[pRspMsg->RspMsg.Length() - 2] & 0x80)          pRspMsg->RspMsg.buf[pRspMsg->RspMsg.Length() - 2] = 0; 一个字节和0x80与运算(& 0x80 )是否...
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Echarts透明背景及兼容问题 - 用户反馈 - 清泛IT社区,为创新赋能!

用户反馈wxbit导入失败:高德地图,启动画面等导致。 Echart是自己导入及实现的,背景透明没有效果,最终WebViewPlus拓展解决了。 方法一: var option={     backgroundColor:'rgba(128, 128, 128, 0.1)' //rgba设置透明度0.1 } 方法二: va...
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How efficient can Meteor be while sharing a huge collection among many clients?

...onnection to its client and updates its server-side in-memory copy. Total CPU cost is the cost to diff one Mongo query, plus the cost of 1,000 merge boxes checking their clients' state and constructing a new DDP message payload. The only data that flows over the wire is a single JSON object sent t...