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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...曾遇到过类似的问题，在他的场景里，问题的主要原因是系统IO操作繁忙时，数据文件预分配堵塞了其它操作，从而导致雪崩效应。
为了验证这种可能，我搜索了一下MongoDB日志：
shell> grep FileAllocator /path/to/log
[FileAllocator] allo...
Webdriver Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms
...g to run Firefox on the remote host, but display it on your local host. On Mac OS X, you will need to download XQuartz in order to use X11 forwarding.
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libxml/tree.h no such file or directory
...ml2.dylib to your project (don't put it in the Frameworks section). On the Mac,
you'll find it at /usr/lib/libxml2.dylib and for the iPhone, you'll
want the
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/usr/lib/libxml2.dylib
version.
Since libxml2 is a .dylib (no...
How to determine CPU and memory consumption from inside a process?
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Mac OS X
I was hoping to find similar information for Mac OS X as well. Since it wasn't here, I went out and dug it up myself. Here are some of the things I found. If anyone has any other suggestions, I'd love to hear them.
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When are you truly forced to use UUID as part of the design?
...llision.
Version 1 UUIDs are the most common. They use the network card's MAC address (which unless spoofed, should be unique), plus a timestamp, plus the usual bit-twiddling to generate the UUID. In the case of a machine that doesn't have a MAC address, the 6 node bytes are generated with a crypto...
How to mark-up phone numbers?
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Working on Seamonkey 2.20 on Mac 10.8 put below the <body <?php body_class(); ?>> code on a wordpress theme's header.php file.
– om01
Sep 6 '13 at 0:33
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【PM干货】2015年阿里业务型PM笔试题 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...型PM笔试题一、客观题（总共十题）下面那个文件是用户系统间的数据传输：1、UML2、HTML3、XML4、WML458、346、908、739、（）正方体六个面分别是红、...一、客观题（总共十题）
下面那个文件是用户系统间的数据传输：
1、UML 2...
Stop “developer tools access needs to take control of another process for debugging to continue” ale
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This worked for me with Xcode 8 on an iMac running a TeamCity agent on Mac OS Sierra.
– Ben Thomas
Mar 3 '17 at 3:17
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Bash command to sum a column of numbers [duplicate]
... Just as an FYI, the -s option is in GNU paste; it is not supported by Mac OS X 10.7.4 paste. However, since the POSIX 2008 specification of paste supports -s, this is a deficiency in the Mac OS X version.
– Jonathan Leffler
Aug 15 '12 at 18:56
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rsync error: failed to set times on “/foo/bar”: Operation not permitted
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I'm on a mac, rsync'ing to linux (a slicehost machine).
– dreeves
Mar 20 '09 at 21:20
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