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What is difference between sjlj vs dwarf vs seh?
...looking for? Browse other questions tagged c++ compiler-construction mingw cpu-architecture mingw-w64 or ask your own question.
LINQ To Entities does not recognize the method Last. Really?
...u pointed out, it could bring back thousands of records and waste loads of CPU materialising objects that will never get used)
Again, I would not recommend doing this second, but it does help illustrate the difference between where and when the LINQ expression is executed.
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凤姐当天使 徐小平胡海泉薛蛮子王刚怎么看？ - 资讯 - 清泛网 - 专注C/C++...
...们投资偏硬技术比较多一点，一般现在的天使碰不到这些问题，你要投硬技术的时候，其实是特别痛苦的一件事，比如说现在天使投资都说人不好，我们就不投了，投硬技术，往往真理就在这个人的手里，他能掌握这个核心技术...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...内存到CentralCache里。 解决了ptmalloc2中arena之间不能迁移的问题。
Tcmalloc占用更少的额外空间。例如，分配N个8字节对象可能要使用大约8N * 1.01字节的空间。即，多用百分之一的空间。Ptmalloc2使用最少8字节描述一个chunk。
更快。...
unsigned int vs. size_t
...2 (byte). 16 bit arithmetic was faster than 32 bit arithmetic, though the CPU could handle a (logical) memory space of up to 4 GiB.
Use the int type only when you care about efficiency as its actual precision depends strongly on both compiler options and machine architecture. In particular the C ...
What's the difference between Task.Start/Wait and Async/Await?
...e another thread is doing the work, and that thread has been assigned to a CPU, so the work is actually being done. Maybe the work is being done by hardware and there is no thread at all. But surely, you say, there must be some thread in the hardware. No. Hardware exists below the level of thread...
Grepping a huge file (80GB) any way to speed it up?
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If you have a multicore CPU, I would really recommend GNU parallel. To grep a big file in parallel use:
< eightygigsfile.sql parallel --pipe grep -i -C 5 'db_pd.Clients'
Depending on your disks and CPUs it may be faster to read larger blocks:
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How do I create a unique constraint that also allows nulls?
...onal disk space.
Note that if you don't want an index, you can still save CPU by making the expression be precalculated to disk by adding the keyword PERSISTED to the end of the column expression definition.
In SQL Server 2008 and up, definitely use the filtered solution instead if you possibly ca...
Should I instantiate instance variables on declaration or in the constructor?
...ow it was him). Personal taste is personal taste; ultimately, neither the CPU nor the JRE care about syntactical style.
– Aquarelle
Sep 20 '13 at 22:38
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How do I automatically update a timestamp in PostgreSQL
... Says so in the Postgres documentation of the types. Varchar has extra CPU cycles to check for the constraint, which doesn't happen on TEXT.
– Rahly
Jun 21 '17 at 15:50
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