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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。...
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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. share | i...
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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...
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Selecting only first-level elements in jquery

...ction() { $(this).parent().find(">ul")...Something; } See example : https://codepen.io/gmkhussain/pen/XzjgRE share | improve this answer | follow | ...
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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 share | improve this answer | follow ...
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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...
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How to 'bulk update' with Django?

... 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...
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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 share | improve this answer | follow | ...
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Android webview & localStorage

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Should JAVA_HOME point to JDK or JRE?

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