Linux Runs All of the World’s Fastest Supercomputers



  • Since its release 26 years ago, Linux has not only persisted–it has come to dominate every market it enters. So it came as no surprise when Top500.org revealed that Linux powers every one of the world’s 500 fastest supercomputers.

    Linux is the right match for the needs of the supercomputing industry because it’s immensely scalable, proven and free for anyone to use. The real strength of Linux, however, lies in the community behind it.

    More than 15,000 developers have contributed to the Linux kernel over time and they are not letting up. This year we’ve seen 10,000 lines of code added each day, 2,000 modified and 2,500 removed. Linux changes 8.5 times every hour, allowing it to meet a continuously evolving array of developer needs.

    While we’re elated by the community’s achievement in supercomputers, we also note heavy use of Linux in other demanding environments. Of IBM’s top mainframe customers, 90 percent run Linux. Similarly, Linux powers 90 percent of the public cloud workload. We estimate Linux has 62 percent of the embedded systems market, and earlier this year, Linux-based Android became the Internet’s most widely used operating system.

    The growth of Linux shows no signs of slowing. Its success is the result of the dedication of the open source community that is committed to sharing best practices and promoting the use of Linux in areas like mainframe, HPC, and more. This has been an amazing year for Linux and open source, and we look forward to even more growth in 2018.

    The post Linux Runs All of the World’s Fastest Supercomputers appeared first on The Linux Foundation.

    https://www.linuxfoundation.org/blog/linux-runs-all-of-the-worlds-fastest-supercomputers/





Tmux Commands

screen and tmux

A comparison of the features (or more-so just a table of notes for accessing some of those features) for GNU screen and BSD-licensed tmux.

The formatting here is simple enough to understand (I would hope). ^ means ctrl+, so ^x is ctrl+x. M- means meta (generally left-alt or escape)+, so M-x is left-alt+x

It should be noted that this is no where near a full feature-set of either group. This - being a cheat-sheet - is just to point out the most very basic features to get you on the road.

Trust the developers and manpage writers more than me. This document is originally from 2009 when tmux was still new - since then both of these programs have had many updates and features added (not all of which have been dutifully noted here).

Action tmux screen
start a new session tmux OR
tmux new OR
tmux new-session
screen
re-attach a detached session tmux attach OR
tmux attach-session
screen-r
re-attach an attached session (detaching it from elsewhere) tmux attach -d OR
tmux attach-session -d
screen -dr
re-attach an attached session (keeping it attached elsewhere) tmux attach OR
tmux attach-session
screen -x
detach from currently attached session ^b d OR
^b :detach
^a ^d OR
^a :detach
rename-window to newname ^b , <newname> OR
^b :rename-window <newn>
^a A <newname>
list windows ^b w ^a w
list windows in chooseable menu ^a "
go to window # ^b # ^a #
go to last-active window ^b l ^a ^a
go to next window ^b n ^a n
go to previous window ^b p ^a p
see keybindings ^b ? ^a ?
list sessions ^b s OR
tmux ls OR
tmux list-sessions
screen -ls
toggle visual bell ^a ^g
create another window ^b c ^a c
exit current shell/window ^d ^d
split window/pane horizontally ^b " ^a S
split window/pane vertically ^b % ^a |
switch to other pane ^b o ^a <tab>
kill the current pane ^b x OR (logout/^D)
collapse the current pane/split (but leave processes running) ^a X
cycle location of panes ^b ^o
swap current pane with previous ^b {
swap current pane with next ^b }
show time ^b t
show numeric values of panes ^b q
toggle zoom-state of current pane (maximize/return current pane) ^b z
break the current pane out of its window (to form new window) ^b !
re-arrange current panels within same window (different layouts) ^b [space]
Kill the current window (and all panes within) ^b killw [target-window]
  • Use the same script for updating/ upgrading

    Make sure to change the versions to the latest releases:

    #!/bin/bash set -e bpcver=4.2.1 bpcxsver=0.57 rsyncbpcver=3.0.9.12

    Scroll through the script, know what you are doing.

    Uncomment the upgrade section(s) and comment out the install section(s)

    read more
  • Again running smartctl after all is said and done:

    smartctl --all /dev/sda

    ddrescue-smartctl-after-rescue.png ddrescue-smartctl-2.png

    Yet an old drive in itself, I run the wheels off of them, and monitor regularly as anyone should.

    read more
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