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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
... 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc...
How to view UTF-8 Characters in VIM or Gvim
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On Microsoft Windows, gvim wouldn't allow you to select non-monospaced fonts. Unfortunately Latha is a non-monospaced font.
There is a hack way to make it happen: Using FontForge (you can download Windows binary from http://www.geocities.jp/meir000/fontforge/) to edit the L...
How do I remove all non-ASCII characters with regex and Notepad++?
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To keep new lines:
First select a character for new line... I used #.
Select replace option, extended.
input \n replace with #
Hit Replace All
Next:
Select Replace option Regular Expression.
Input this : [^\x20-\x7E]+
Keep Replace With Empty
Hit...
How to change default text file encoding in Eclipse?
...needed to do is:
Window > Preferences > General > Content Types
Select Text > HTML in the tree
Select all file associations, particularly .html
Input "UTF-8" in the text-field "default encoding"
share
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Visual Studio: How can I see the same file in two separate tab groups?
...have two copies of the same file. Then you can right-click the tab bar and select New Vertical Tab Group (or New Horizontal Tab Group, the one you like more).
Hope I understood you question..
share
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What's the best way to make a d3.js visualisation layout responsive?
...n the window resizes like so:
var aspect = width / height,
chart = d3.select('#chart');
d3.select(window)
.on("resize", function() {
var targetWidth = chart.node().getBoundingClientRect().width;
chart.attr("width", targetWidth);
chart.attr("height", targetWidth / aspect);
});
...
Is there a standard keyboard shortcut to build the current project in Visual Studio?
...mmand doesn't seem to work in VS2008.
Assign the shortcut to "Build.BuildSelection". If you have a solution with several projects and files open from the various projects, whatever file you are currently editing will define the project that will be built when you use the assigned shortcut for "Bu...
How to delete a workspace in Perforce (using p4v)?
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From the "View" menu, select "Workspaces". You'll see all of the workspaces you've created. Select the workspaces you want to delete and click "Edit" -> "Delete Workspace", or right-click and select "Delete Workspace". If the workspace is "lock...
Rails filtering array of objects by attribute value
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Try :
This is fine :
@logos = @attachments.select { |attachment| attachment.file_type == 'logo' }
@images = @attachments.select { |attachment| attachment.file_type == 'image' }
but for performance wise you don't need to iterate @attachments twice :
@logos , @images...
How to remove a key from Hash and get the remaining hash in Ruby/Rails?
...m a hash and get the remaining hash in Ruby.
.slice => It will return selected keys and not delete them from the original hash. Use slice! if you want to remove the keys permanently else use simple slice.
2.2.2 :074 > hash = {"one"=>1, "two"=>2, "three"=>3}
=> {"one"=>1, "tw...