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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...le? It could also be > emptyfile.c or : > emptyfile.c or dd if=/etc/passwd of=emptyfile.c count=0 or …
– Jonathan Leffler
Oct 10 '13 at 14:07
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How expensive is the lock statement?
...hat this is impossible to quantify, it heavily depends on the state of the CPU memory write-back buffers and how much data that the prefetcher gathered has to be discarded and re-read. Which are both very non-deterministic. I use 150 CPU cycles as a back-of-the-envelope approximation that avoids m...
How do you compare structs for equality in C?
...ting point types with redundant encodings. (Intel long double, decimal64, etc.) These issues make no difference is calloc() used or not or padding.
– chux - Reinstate Monica
Apr 14 '15 at 15:02
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Select n random rows from SQL Server table
...ISTICS IO ON
/* newid()
rows returned: 10000
logical reads: 3359
CPU time: 3312 ms
elapsed time = 3359 ms
*/
SELECT TOP 1 PERCENT Number
FROM Numbers
ORDER BY newid()
/* TABLESAMPLE
rows returned: 9269 (varies)
logical reads: 32
CPU time: 0 ms
elapsed time: 5 ms
*/
SELECT N...
How to do ssh with a timeout in a script?
...h some sort of configuration management tool like puppet/ansible/chef/salt/etc.
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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...设备标识符。然后，接收器会过滤掉它感兴趣的设备。
问题是：App Inventor 没有内置 UDP，而且我找不到可用的扩展。所以自己动手吧。
注意：
如果智能手机和远程站位于同一个（本地）网络中，则扩展可以完美运行。如果智...
Office在线预览及PDF在线预览的实现方式大集合 - 更多技术 - 清泛网 - 专注...
...阅读体验大大下降。
3、转换过程非常耗费资源，低配的CPU几乎能跑满，服务器卡死。转换时间也非常漫长，这个时间主要是卡在了转换PDF上面。
4、转换完成服务器会遗留大量Excel、Word进程无法正常退出，有一些折中的解决办...
How do I prevent a Gateway Timeout with FastCGI on Nginx
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If it helps, mine was at /etc/nginx/ at Media Temple's DV system.
– jeffkee
Aug 2 '12 at 21:37
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Is it possible to “decompile” a Windows .exe? Or at least view the Assembly?
...e disassembler/debugger. Used by most professionals, like malware analysts etc. Costs quite a few bucks though (there exists free version, but it is quite quite limited)
W32Dasm(free) - a bit dated but gets the job done. I believe W32Dasm is abandonware these days, and there are numerous user-create...
Should I use multiplication or division?
...ython it's faster to multiply than to divide, but as you get closer to the CPU using more advanced VMs or JITs, the advantage disappears. It's quite possible that a future Python VM would make it irrelevant
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