Brett Holman holmanb

Note: I need to do this on multiple machines, and it took a while to figure out the easiest way to do this on Fedora, so I'm documenting the process.

Get & Configure the Kernel

git clone https://github.com/torvalds/linux.git
cd linux
make allnoconfig
make x86_64_defconfig

Vagrant Ubuntu 16.04 Example

mkdir folder_of_awesomeness
cd folder_of_awesomeness/
vagrant init bento/ubuntu-16.04
vagrant up --provider=virtualbox    # because they don't have a libvert provider
vagrant ssh

Papers:

Array Layouts For Comparison-Based Searching

What Every Programmer Should Know About Memory

An argument in favor of strong scaling for deepneural networks with small datasets

Locating Cache Performance Bottlenecks Using Data Profiling

so typically I run gdb like:

gdb --with-args ./mycmd arg1 arg2

break <function name>                            # set a breakpoint
break <filename>:<function name>:<line_nr>       # set a breakpoint

run                                              # starts the program

	#!/usr/bin/python
	# concatenate_test.py
	# based on https://stackoverflow.com/a/24718551/7407726
	# modified to include f string benchmarking for a task I'm working on now, might come in handy later

	from __future__ import print_function
	import timeit

	domain = 'some_really_long_example.com'
	lang = 'en'

	Problem #1: deleted snapshots consume filepath name

	root@hostname-kvm:~/bcachefs-tools# /root/bcachefs-tools/bcachefs subvolume snapshot /mount/subvol_1 /mount/snapshot_1
	root@hostname-kvm:~/bcachefs-tools# /root/bcachefs-tools/bcachefs subvolume delete /mount/snapshot_1/
	root@hostname-kvm:~/bcachefs-tools# /root/bcachefs-tools/bcachefs subvolume snapshot -r /mount/subvol_1 /mount/snapshot_1
	BCH_IOCTL_SUBVOLUME_CREATE ioctl error: File exists


	Problem #2: snapshot of a deleted subvolume can't be deleted

	Output:
	00020 Running tests subvol_create subvol_delete subvol_delete_snapshot_of_deleted_subvol subvol_snapshot_create subvol_snapshot_delete subvol_snapshot_reuse_snapshot_name
	00020
	00020 ========= TEST subvol_create
	00020
	00020 bcachefs (sdb): recovering from clean shutdown, journal seq 4
	00020 bcachefs (sdb): going read-write
	00020 bcachefs (sdb): mounted with opts: (null)
	00020
	00020 ========= PASSED subvol_create in 0s

	00026 Passed: subvol_create subvol_delete subvol_snapshot_create subvol_snapshot_delete
	00026 Failed: subvol_delete_snapshot_of_deleted_subvol subvol_snapshot_reuse_snapshot_name
	00026 TEST FAILED
	00363 watchdog: BUG: soft lockup - CPU#3 stuck for 54671s! [swapper/3:0]
	00363 Modules linked in:
	00363 CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.13.0-354627-g6c5219caf0cc #3
	00363 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
	00363 RIP: 0010:default_idle+0xe/0x10
	00363 Code: 8b 04 25 c0 6c 01 00 f0 80 60 02 df c3 0f ae f0 0f ae 38 0f ae f0 eb b6 0f 1f 40 00 e9 07 00 00 00 0f 00 2d dc ad 5e 00 fb f4 <c3> cc 55 48 89 e5 53 65 8b 15 4c 50 7f 7e 0f 1f 44 00 00 e8 7a 56
	00363 RSP: 0018:ffff8880029e3ee0 EFLAGS: 00000212

	root@me:~# cloud-init devel schema --docs cc_write_files

	Write Files
	-----------
	Summary: write arbitrary files

	Write out arbitrary content to files, optionally setting permissions.
	Parent folders in the path are created if absent.
	Content can be specified in plain text or binary. Data encoded with
	either base64 or binary gzip data can be specified and will be decoded


	0 require "lspconfig".pyright.setup {
	1 on_attach = on_attach,
	2 capabilites = capabilities, -- from nvim-cmp
	3 lintIgnoreExitCode = true,
	4 settings = {
	5 python = {
	6 analysis = {
	7 diagnosticSeverityOverrides = {
	8 reportUnusedVariable = "error"