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@chrismccoy
chrismccoy / gitcheats.txt
Last active October 24, 2025 12:31
git cheats
# alias to edit commit messages without using rebase interactive
# example: git reword commithash message
reword = "!f() {\n GIT_SEQUENCE_EDITOR=\"sed -i 1s/^pick/reword/\" GIT_EDITOR=\"printf \\\"%s\\n\\\" \\\"$2\\\" >\" git rebase -i \"$1^\";\n git push -f;\n}; f"
# release alias with tagging
# usage: git release v2.3.0 "Finalized API and added documentation" ./docs.zip
release = !f() { tag="$1"; title="$2"; shift 2; gh release create "$tag" --target $(git rev-parse HEAD) -t "$title" --generate-notes "$@"; }; f
# usage gh lockdown
# git alias to disable wikis, issues, projects for existing repos
@jboner
jboner / latency.txt
Last active November 1, 2025 21:13
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