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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...che分配，大对象从CentralCache分配。大对象分配的空间都是4k页面对齐的，多个pages也能切割成多个小对象划分到ThreadCache中。
小对象有将近170个不同的大小分类(class)，每个class有个该大小内存块的FreeList单链表，分配的时候先找...
Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...使内存占用尽量减少，我将Nginx的request_pool_size从默认的4k改成1k了。另外，net.ipv4.tcp_wmem与net.ipv4.tcp_rmem中的默认值也设置成4k。
两百万连接时，通过nginx的监控得到数据：
两百万连接时系统内存情况：
Http comet 长连接
Convert InputStream to byte array in Java
...ls toByteArray(). It handles large files by copying the bytes in blocks of 4KiB.
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How to copy a directory structure but only include certain files (using windows batch files)
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Thanks To Previous Answers. :)
This script named "r4k4copy.cmd":
@echo off
for %%p in (SOURCE_DIR DEST_DIR FILENAMES_TO_COPY) do set %%p=
cls
echo :: Copy Files Including Folder Tree
echo :: http://stackoverflow.com
rem /questions/472692/how-to-copy
rem -a-directory-...
Passing arrays as url parameter
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Stefan GehrigStefan Gehrig
77.4k2222 gold badges144144 silver badges177177 bronze badges
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Sublime Text 3 how to change the font size of the file sidebar?
...etter solution if the whole UI is looking small (for example, when using a 4k display). I used a value of 1.5 under Ubuntu+XFCE.
– Enrico
Apr 18 '16 at 11:29
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Pure CSS to make font-size responsive based on dynamic amount of characters
... 640, 800, 1024, 1280, 1440, 1600, 1920, 2048, 2560. Don't even bother for 4k, it will bloat your images too much and the 2560 size stretched to 100% width looks just fine on a 4k monitor (I've tested this). Also, don't bother with 720 (720x480) as the previous poster suggested. Its a resolution use...
How to remove the querystring and get only the url?
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Most Easiest Way
$url = 'https://www.youtube.com/embed/ROipDjNYK4k?rel=0&autoplay=1';
$url_arr = parse_url($url);
$query = $url_arr['query'];
print $url = str_replace(array($query,'?'), '', $url);
//output
https://www.youtube.com/embed/ROipDjNYK4k
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...计》一文中发表，就在这篇文章的第73页中一段描述两个黑帮之间的通信中被阐明。 1978年，在Jim Gray的《数据库操作系统注意事项》一书中（从第465页开始）被命名为两个将军悖论。作为两个将军问题的定义和无解性的证明的来...
Are there any disadvantages to always using nvarchar(MAX)?
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New results on SQL Server 2012: 10 is twice slower than 4k and MAX is 5.5 times slower than 4k.
– cassandrad
Feb 10 '16 at 16:48
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