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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...oc/free系列函数，而glibc使用的ptmalloc2在性能上远远弱后于google的tcmalloc和facebook的jemalloc。 而且后两者只需要使用LD_PRELOAD环境变量启动程序即可，甚至并不需要重新编译。
glibc ptmalloc2
ptmalloc2即是我们当前使用的glibc malloc版本。...
Comet and jQuery [closed]
...my blog and the current code with a basic chat example can be found on its google code page. Hope this info is helpful and feel free to contact me if need any further help with the plugin.
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SQLAlchemy: What's the difference between flush() and commit()?
...ld use a flush instead of just committing.
Since a commit always flushes (https://docs.sqlalchemy.org/en/13/orm/session_basics.html#committing) these sound really similar. I think the big issue to highlight is that a flush is not permanent and can be undone, whereas a commit is permanent, in the se...
Selecting only first-level elements in jquery
...ction() {
$(this).parent().find(">ul")...Something;
}
See example : https://codepen.io/gmkhussain/pen/XzjgRE
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PhpStorm text size
...dd::
send,^{WheelUp}
return
the complete script you could find here: https://gist.github.com/sl5net/7170280#file-gistfile1-txt
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Is SHA-1 secure for password storage?
...HA-1 falls very far short of the state of the art.
For further reading:
https://crypto.stackexchange.com/questions/400/why-cant-one-implement-bcrypt-in-cuda
http://codahale.com/how-to-safely-store-a-password/
http://www.codinghorror.com/blog/2012/04/speed-hashing.html
https://security.stackexchan...
How to 'bulk update' with Django?
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Django 2.2 version now has a bulk_update method (release notes).
https://docs.djangoproject.com/en/stable/ref/models/querysets/#bulk-update
Example:
# get a pk: record dictionary of existing records
updates = YourModel.objects.filter(...).in_bulk()
....
# do something with the updates di...
How do I clone a specific Git branch? [duplicate]
... Example, with OpenCV 2.4 branch:
git clone -b opencv-2.4 --single-branch https://github.com/Itseez/opencv.git
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Android webview & localStorage
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Should JAVA_HOME point to JDK or JRE?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...