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How efficient is locking an unlocked mutex? What is the cost of a mutex?

...ect happens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking. How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that t...
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What unique features does Firebug have that are not built-in to Firefox?

... can replace firebug with the native tools someday, because I think its impossible for the firebug addon to get the high performance of the native tools. – malisokan Nov 15 '14 at 13:30 ...
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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术

...的了解和阅读。 如Lustre、 HDFS MogileFS FastDFS OpenAFS MooseFS pNFS GoogleFS TFS(taobao)。 仔细阅读下来,发现上述系统不是不成熟,就是太大了,以至于根本就没有合适的环境去部署。寻寻觅觅中一个叫drbd的软件进入了视线 ...
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Understand homebrew and keg-only dependencies

... I have an openssl 1.0.2s installed by homebrew and my mac os has LibreSSL 2.6.5 When I do openssl version, it always shows the one from os (LibreSSL) but when I run my python in interactive mode, it is actually using openssl. Can you help me understand how python picked up the corre...
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Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?

Can one develop an entire application using JavaFX and run it on iOS, Android or Windows Phone 8, without writing platform-specific code? ...
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Why should C++ programmers minimize use of 'new'?

...ith no apparent benefit. Why you should use automatic storage as often as possible Basically, the last paragraph sums it up. Using automatic storage as often as possible makes your programs: faster to type; faster when run; less prone to memory/resource leaks. Bonus points In the referenced quest...
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How do you print in a Go test using the “testing” package?

...s that are not failing, you have to provide go test the -v flag (v for verbosity). More details on testing flags can be found here: https://golang.org/cmd/go/#hdr-Testing_flags share | improve this ...
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Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?

...ption sluggish or unreliable, and sometimes I have to restart the kernel, losing everything in memory. 5 Answers ...
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REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术

... 第二检查软件环境要求 配置IP与主机名对应关系 1、hostname 2、static ip address 修改后的文件, DEVICE=eth0 HWADDR=00:0C:29:EC:D0:45 TYPE=Ethernet UUID=fa934d66-d4f7-495b-bb04-c4fba00686a7 ONBOOT=yes #no 改成yes 启动自动激活 NM_CONTROLLED...
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Why does this method print 4?

... for 1 recursive call (1 more than original), the memory use is M + R. Suppose that StackOverflowError is thrown after C successful recursive calls, that is, M + C * R <= X and M + C * (R + 1) > X. At the time of the first StackOverflowError, there's X - M - C * R memory left. To be able to r...