This is a quick & dirty way to attach an Akai MPK mini 2 USB MIDI controller to Linux so the Linux machine can act as its synthesizer. This approach should work for any modern USB MIDI instrument.
I looked around on the web and, surprisingly, I didn't find any simple options for quickly starting Fluidsynth up and wiring it to a MIDI controller for simple keyboard usage. There are a few out there that involve using Qsynth which is cool but I didn't want a GUI for something relatively simple.
| tobert@spaceghost /sys/devices/system/clocksource/clocksource0 $ cat /proc/cpuinfo |grep 'model name' |head -n 1 | |
| model name : Intel(R) Xeon(R) CPU E31270 @ 3.40GHz | |
| tobert@spaceghost /sys/devices/system/clocksource/clocksource0 $ cat /proc/version | |
| Linux version 3.11.4-gentoo (root@sysresccd) (gcc version 4.6.4 (Funtoo 4.6.4) ) #1 SMP Mon Oct 7 05:33:55 | |
| tobert@spaceghost /sys/devices/system/clocksource/clocksource0 $ cat available_clocksource | |
| tsc hpet acpi_pm | |
| tobert@spaceghost /sys/devices/system/clocksource/clocksource0 $ cat current_clocksource | |
| tsc | |
| tobert@spaceghost /sys/devices/system/clocksource/clocksource0 $ echo hpet |sudo tee current_clocksource | |
| hpet |
Add these flags to cassandra-env.sh
-XX:+UseLargePages # enable huge page support in the JVM
-XX:LargePageSizeInBytes=2m # tell the JVM to ask for 2MB hugepages
-XX:+AlwaysPreTouch # make sure the JVM initializes all of its memory to avoid fragmentation
Then to allow the JVM to allocate huagepages, the kernel needs to be told how many huge pages to create. This is done by setting vm.nr_hugepages. In order to use these reserved pages, a non-root process needs to be part of a Unix group that will be allowed
| ########## | |
| # Win10 Initial Setup Script | |
| # Author: Disassembler <disassembler@dasm.cz> | |
| # Version: 1.7, 2016-08-15 | |
| # dasm's script: https://github.com/Disassembler0/Win10-Initial-Setup-Script/ | |
| # THIS IS A PERSONALIZED VERSION | |
| # This script leaves more MS defaults on, including MS security features. | |
| # Tweaked based on personal preferences for @alirobe 2016-11-16 - v1.7.1 |
| processor : 0 | |
| vendor_id : GenuineIntel | |
| cpu family : 6 | |
| model : 42 | |
| model name : Intel(R) Xeon(R) CPU E31270 @ 3.40GHz | |
| stepping : 7 | |
| microcode : 0x14 | |
| cpu MHz : 1640.765 | |
| cache size : 8192 KB | |
| physical id : 0 |
| # jmx: metrics and administration interface | |
| # | |
| # add this if you're having trouble connecting: | |
| # JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<public name>" | |
| myip=$(ip -4 addr show eno1 |awk '/inet /{ gsub(/\/[0-9]+/, ""); print $2 }') | |
| JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=$myip" | |
| # | |
| # see |
| atobey@zorak ~ $ traceroute 8.8.8.8 | |
| traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets | |
| 1 homeportal (192.168.42.1) 9.817 ms 9.816 ms 9.812 ms | |
| 2 50-0-37-1.dsl.static.sonic.net (50.0.37.1) 47.140 ms 47.146 ms 48.199 ms | |
| 3 gig1-35.cr1.lsatca11.sonic.net (70.36.243.137) 48.182 ms 48.184 ms 49.345 ms | |
| 4 0.xe-5-1-0.gw.pao1.sonic.net (69.12.211.1) 59.457 ms 59.809 ms 61.355 ms | |
| 5 ae2.0.gw.equinix-sj.sonic.net (50.0.2.14) 63.367 ms 63.370 ms 80.505 ms | |
| 6 eqixsj-google-gige.google.com (206.223.116.21) 73.541 ms 77.821 ms 77.818 ms | |
| 7 216.239.49.168 (216.239.49.168) 79.379 ms 216.239.49.170 (216.239.49.170) 84.256 ms 216.239.49.168 (216.239.49.168) 83.373 ms | |
| 8 209.85.250.60 (209.85.250.60) 68.261 ms 209.85.246.38 (209.85.246.38) 69.341 ms 69.338 ms |
| #!/bin/bash | |
| # otel-cli-ideas.sh - some ideas I'm playing with for otel-cli to cover some | |
| # use cases where manual spans or exec don't quite do the trick | |
| # | |
| # another cool outcome is you could run this without the collector in some | |
| # cases without spamming your OTLP endpoint... | |
| # | |
| # I hope to OSS otel-cli under Apache 2 in early April 2021. | |
| # maybe it could background itself and wait for events on a unix socket? |
| #!/bin/bash | |
| # A quick & dirty backup script for Cassandra running inside Docker. | |
| # Assumes /var/lib/cassandra is mounted in the container as /var/lib/cassandra because | |
| # docker inspect {{ .Volumes }} is not shell-friendly. (doable, but meh) | |
| # Also assumes Cassandra was started with 'docker run --name cassandra'. | |
| export PATH=$PATH:/home/atobey/bin:/usr/local/bin | |
| set -e |
| #!/bin/bash | |
| svc="SRECon" | |
| # turns out the date doesn't matter much for this exercise since | |
| # we don't show it | |
| # but it is important for /finding/ these spans once you've sent them | |
| # so pick a date/time earlier today while testing :) | |
| talk_start="2022-03-14T20:00:00.00000Z" | |
| talk_end="2022-03-14T20:40:00.00000Z" |