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mmap() vs. reading blocks

I'm working on a program that will be processing files that could potentially be 100GB or more in size. The files contain sets of variable length records. I've got a first implementation up and running and am now looking towards improving performance, particularly at doing I/O more efficiently since...
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Javascript: negative lookbehind equivalent?

... 79.0 ✔️ Node.js 6.0 behind a flag and 9.0 without a flag ✔️ Deno (all versions) ✔️ SpiderMonkey ✔️ Mozilla Firefox 78.0 ????️ JavaScriptCore: Apple is working on it ????️ Apple Safari ????️ iOS WebView (all browsers on iOS + iPadOS) ❌ Chakra: Microsoft was working on ...
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How can I fix the Microsoft Visual Studio error: “package did not load correctly”?

I installed Visual Studio 2012 and DevExpress 13.1. As Visual Studio started, it generated an error shown by this attached image, ...
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How can I avoid running ActiveRecord callbacks?

I have some models that have after_save callbacks. Usually that's fine, but in some situations, like when creating development data, I want to save the models without having the callbacks run. Is there a simple way to do that? Something akin to... ...
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Ignoring an already checked-in directory's contents?

...d only to hold graphics and sound files used in several projects. They are all in one directory without sub-directories. Now I just created a script to copy these assets over from another, structured directory, with several levels of sub-directories. ...
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Why does C# not provide the C++ style 'friend' keyword? [closed]

The C++ friend keyword allows a class A to designate class B as its friend. This allows Class B to access the private / protected members of class A . ...
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Shell command to tar directory excluding certain files/folders

...r. If you want to archive everything except /usr you can use: tar -zcvf /all.tgz / --exclude=/usr In your case perhaps something like tar -zcvf archive.tgz arc_dir --exclude=dir/ignore_this_dir share | ...
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Why doesn't height: 100% work to expand divs to the screen height?

...lement <html>, which can be a percentage height. . So, you've given all of your elements height, except for the <html>, so what you should do is add this: html { height: 100%; } And your code should work fine. * { padding: 0; margin: 0; } html, body, #fullheight { min-he...
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Using Vim's tabs like buffers

...out", because that's what a tab is—it's a different layout of windows of all of your existing buffers. Trying to beat Vim into 1 tab == 1 buffer is an exercise in futility. Vim doesn't know or care and it will not respect it on all commands—in particular, anything that uses the quickfix buffer ...
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Favorite Django Tips & Features?

... This alleviates you from always type os.path.join() which gets annoying pretty fast: j = lambda filename: os.path.join(PROJECT_DIR, filename). Then you just need to type j("static"). – wr. Ma...