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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
...nning on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这...
How to find the foreach index?
Is it possible to find the foreach index?
13 Answers
13
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Create an array with random values
How can I create an array with 40 elements, with random values from 0 to 39 ?
Like
21 Answers
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Why does Java's hashCode() in String use 31 as a multiplier?
...you might get WAY more collisions if you use any kind of international charset with common characters outside the ASCII range. At least, I checked this for 31 and German. So I think the choice of 31 is broken.
– Hans-Peter Störr
May 11 '10 at 6:58
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jquery change class name
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You can set the class (regardless of what it was) by using .attr(), like this:
$("#td_id").attr('class', 'newClass');
If you want to add a class, use .addclass() instead, like this:
$("#td_id").addClass('newClass');
Or a short ...
Why use strict and warnings?
...control warnings.
Use strict - declare variables scope. It is used to set some kind of
discipline in the script.If barewords are used in the code they are
interpreted.All the variables should be given scope ,like my,our or
local.
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What is the difference between “AS” and “IS” in an Oracle stored procedure?
... editor after snippets, if snippets enabled
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What's a standard way to do a no-op in python?
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How to make a div with no content have a width?
...sed to min-height because it doesn't force a height. Say your font-size is set to 16px and your padding is 15px. Your div will retain the same height before and after text is added to the div (assuming it's all on one line)
– eroedig
Jul 16 '15 at 18:56
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File size exceeds configured limit (2560000), code insight features not available
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In IntelliJ 2016 and newer you can change this setting from the Help menu, Edit Custom Properties (as commented by @eggplantbr).
On older versions, there's no GUI to do it. But you can change it if you edit the IntelliJ IDEA Platform Properties file:
#------------------...