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Tristan Carel tristan0x

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@jboner
jboner / latency.txt
Last active August 20, 2025 21:38
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@jordansissel
jordansissel / foo.md
Last active February 6, 2021 22:08
logstash message format

logstash json format

{
  "message"    => "hello world",
  "@version"   => "1",
  "@timestamp" => "2014-04-22T23:03:14.111Z",
  "type"       => "stdin",
  "host"       => "hello.local"
}
@myusuf3
myusuf3 / delete_git_submodule.md
Created November 3, 2014 17:36
How effectively delete a git submodule.

To remove a submodule you need to:

  • Delete the relevant section from the .gitmodules file.
  • Stage the .gitmodules changes git add .gitmodules
  • Delete the relevant section from .git/config.
  • Run git rm --cached path_to_submodule (no trailing slash).
  • Run rm -rf .git/modules/path_to_submodule (no trailing slash).
  • Commit git commit -m "Removed submodule "
  • Delete the now untracked submodule files rm -rf path_to_submodule
@angstwad
angstwad / dict_merge.py
Last active December 22, 2024 16:02
Recursive dictionary merge in Python
import collections
def dict_merge(dct, merge_dct):
""" Recursive dict merge. Inspired by :meth:``dict.update()``, instead of
updating only top-level keys, dict_merge recurses down into dicts nested
to an arbitrary depth, updating keys. The ``merge_dct`` is merged into
``dct``.
:param dct: dict onto which the merge is executed
:param merge_dct: dct merged into dct
@travisbhartwell
travisbhartwell / nix-shell-shebang.md
Last active March 29, 2024 19:55
nix-shell and Shebang Lines

NOTE: a more up-to-date version of this can be found on my blog

nix-shell and Shebang Lines

A few days ago, version 1.9 of the Nix package manager was released. From the release notes:

nix-shell can now be used as a #!-interpreter. This allows you to write scripts that dynamically fetch their own dependencies.

@joepie91
joepie91 / .md
Last active March 17, 2023 18:42
Nix in multi-user mode on a non-NixOS (eg. Debian) system

This post is deprecated!

Its contents have been moved to the NixOS wiki here, where they are being kept up to date. Please follow the instructions there instead!

The original post is below for posterity.

 

 

@ericniebler
ericniebler / constexpr_string.cpp
Created December 10, 2016 04:27
An almost perfect design for a hybrid constexpr/runtime string
// Copyright Eric Niebler 2016
#include <cstddef>
#include <cstdio>
#include <cstdint>
#include <cstring>
#include <utility>
#include <type_traits>
#define REQUIRES(X) \
@teamdandelion
teamdandelion / labels_1024.tsv
Last active February 6, 2024 08:33
TensorBoard: TF Dev Summit Tutorial
We can make this file beautiful and searchable if this error is corrected: No tabs found in this TSV file in line 0.
7
2
1
0
4
1
4
9
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9
@ffeu
ffeu / [email protected]
Last active March 12, 2021 14:43
EDIT 2021: NOT WORKING ANYMORE!! clang-format version 7 (7.0.0) formula for brew (check comment below on how to install it)
class ClangFormatAT7 < Formula
desc "Formatting tool for C/C++/Java/JavaScript/Objective-C/Protobuf"
homepage "https://releases.llvm.org/7.0.0/tools/clang/docs/ClangFormat.html"
version "7.0.0"
if MacOS.version >= :sierra
url "https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_700/final/", :using => :svn
else
url "http://llvm.org/svn/llvm-project/llvm/tags/RELEASE_700/final/", :using => :svn
end