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Performance optimization strategies of last resort [closed]

...y under a broad range of scenarios, and perform null checks on parameters, etc. By re-implementing a method you may be able to strip out a lot of logic that does not apply in the exact circumstance you are using it. Down-sides: writing additional code means more surface area for bugs. Do use library...
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从网购到火车票,对比淘宝12306网为何如此烂? - 大数据 & AI - 清泛网 - ...

...到让人“一票难求”的订票网站-12306。12306网站购票难的问题几乎成了所有人的共识。来自前支付宝架构师冯大辉(@Fenng)的这条微博翻出12306这笔账,别有一番滋味。 以冯大辉的计算方法,支付宝11月11日一天就处理了1亿零580万...
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How to Calculate Execution Time of a Code Snippet in C++

... I have another working example that uses microseconds (UNIX, POSIX, etc). #include <sys/time.h> typedef unsigned long long timestamp_t; static timestamp_t get_timestamp () { struct timeval now; gettimeofday (&now, NULL); return now.tv_usec + ...
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写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术

...。 基础的数据结构与算法,掌握好这些在解决一些特定问题时,可以以更加优雅有效的方式处理。 基础的设计原则,无需完全掌握23种经典设计模式,只需要了解一些常用的设计原则即可,甚至你也可以只了解什么是低耦合,...
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Is SHA-1 secure for password storage?

... systems do: the hashed passwords, which used to be in the world-readable /etc/password file, are now in the /etc/shadow file which is protected against read access, except by a few privileged applications. The assumption here is that if the attacker can read /etc/shadow, then he probably has enough...
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What is “vectorization”?

...GE Vectorization describes the absence of any explicit looping, indexing, etc., in the code - these things are taking place, of course, just “behind the scenes” in optimized, pre-compiled C code. Vectorized code has many advantages, among which are: vectorized code is more concise and easier ...
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PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip

...n pgConnect = pg.connect(dbname= db_name, host='localhost', user= db_user, passwd= db_pass) # Rename schema with the new name pgConnect.query("ALTER SCHEMA " + schema_as_template + " RENAME TO " + str(newSchema)) # Dump it command = 'export PGPASSWORD="' + db_pass + '" && pg_dump -U ' + db...
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How do I get Windows to go as fast as Linux for compiling C++?

...is by looking at the differences between the two compilers, build systems, etc etc. – surfasb Dec 20 '11 at 1:24 Windo...
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“An attempt was made to load a program with an incorrect format” even when the platforms are the sam

...been unchecked for my executable, so it was still running with the old Any CPU build. After I fixed that, Visual Studio complained that it couldn't debug the assembly, but that was fixed with a restart. share | ...
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What are the file limits in Git (number and size)?

... if they are called frequently by the web front-end to GitLab/Stash/GitHub etc then they can become bottlenecks. (e.g. 'git branch --contains' seems terribly adversely affected by large numbers of branches.) git-blame could be slow when a file is modified a lot. ...