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@anton0xf
anton0xf / evince-bookmarks-to-pdftk-outline.md
Last active January 10, 2022 09:05
Convert evince bookmarks to PDF outline

extract bookmarks:

$ gio info -a "metadata::evince::bookmarks" coq-art.pdf \
    | sed -n '/metadata::/ s/^.*: //p' > coq-art.bookmarks

and restore its by:

gio set coq-art.pdf 'metadata::evince::bookmarks' "$(cat coq-art.bookmarks)"
@jboner
jboner / latency.txt
Last active July 24, 2024 18:06
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