hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

bsuh

diff --git a/src/lread.c b/src/lread.c
index e1a4b33..4f17e39 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -467,7 +467,7 @@ readbyte_from_file (int c, Lisp_Object readcharfun)
     }
 
   block_input ();
-  c = getc (instream);
+  c = getc_unlocked (instream);

Earnestly

:xdg-support: https://wiki.archlinux.org/index.php/XDG_Base_Directory
:xdg-spec: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
:fhs: https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard
:madness: http://pub.gajendra.net/2012/09/dotfiles
:litter: https://www.reddit.com/r/linux/comments/971m0z/im_tired_of_folders_littering_my_home_directory/
:systemd: https://www.freedesktop.org/wiki/Software/systemd/
:systemd-fhs: https://www.freedesktop.org/software/systemd/man/file-hierarchy.html
:systemd-fhs-bin: https://www.freedesktop.org/software/systemd/man/file-hierarchy.html#~/.local/bin/

:toc: macro

cnlohr

Did you just check out / clone a repository and forget --recursive / --recurse-submodules? Well, do this:

git submodule update --init --recursive --remote

For information about why this nugget was lost and burried in another stack exchange article, see this: https://meta.stackoverflow.com/questions/400424/how-can-i-request-that-a-question-merge-be-reversed

vindarel

Developer experience, libraries, performance… (2021/11)

I'll preface this with three things. 1. I prefer schemes over Common Lisps, and I prefer Racket of the Schemes. 2. There is more to it than the points I raise here. 3. I assume you have no previous experience with Lisp, and don't have a preference for Schemes over Common Lisp. With all that out of the way... I would say Common Lisp/SBCL. Let me explain

1. SBCL Is by far the most common of the CL implementations in 2021. It will be the easiest to find help for, easiest to find videos about, and many major open source CL projects are written using SBCL
2. Download a binary directly from the website http://www.sbcl.org/platform-table.html (even for M1 macs) to get up and running (easy to get started)
3. Great video for setting up Emacs + Slime + Quick Lisp https://www.youtube.com/watch?v=VnWVu8VVDbI

Now as to why Common Lisp over Scheme

ssrihari

An opinionated list of excellent Clojure learning materials

These resources (articles, books, and videos) are useful when you're starting to learn the language, or when you're learning a specific part of the language. This an opinionated list, no doubt. I've compiled this list from writing and teaching Clojure over the last 10 years.

• 🔴 Mandatory (for both beginners and intermediates)
• 🟩 For beginners
• 🟨 For intermediates

Table of contents

1. Getting into the language