vsivsi

func main() {

	dir := "./"
	bad := "\"*:<>?/\\|"

	files, err := os.ReadDir(dir)
	if err != nil {
		panic(err)
	}

vsivsi

GNU C / Asm test of AVX512 opmask clobbering on Darwin

This is an alternative implemenation of: https://gist.github.com/vsivsi/fff8618ace4b02eb410dd8792779bf32

NOTE! This must be run on an Intel processor supporting AVX512F/DQ

Build and run (in background): gcc testmask.c testmask.s && ./a.out &

Send a bunch of SIGURG signals: for ((x=0;x<20;x++)); do kill -s URG <pid>; sleep 0.01; done

vsivsi

Maskcheck is a repro of opmask clobbering by golang async preemption

A GNU C / Asm implementation is here: https://gist.github.com/vsivsi/8511aca1bac528f49fbb45a636afa4b5

NOTE! This must be run on an Intel processor supporting AVX512F/DQ

To test: go test -count 1 -timeout 15m -run '^TestMask$' gist.github.com/vsivsi/fff8618ace4b02eb410dd8792779bf32

This should fail with something like:

vsivsi

  <Instruction name="VPOPCNTD" summary="Packed Population Count for Doubleword Integers">
    <InstructionForm gas-name="vpopcntd" xmm-mode="AVX">
      <ISA id="AVX512VPOPCNTDQ"/>
      <ISA id="AVX512VL"/>
      <Operand type="xmm{k}{z}" input="false" output="true"/>
      <Operand type="m128/m32bcst" input="true" output="false"/>
      <Encoding>
        <EVEX mm="10" pp="01" LL="00" W="0" vvvv="0000" V="0" RR="#0" B="#1" X="#1" b="#1" aaa="#0" z="#0" disp8xN="16"/>
        <Opcode byte="55"/>
        <ModRM mode="#1" reg="#0" rm="#1"/>

vsivsi

vsivsi

#!/usr/bin/ruby
# Create display override file to force Mac OS X to use RGB mode for Display
# see http://embdev.net/topic/284710

require 'base64'

data=`ioreg -l -d0 -w 0 -r -c AppleDisplay`

edids=data.scan(/IODisplayEDID.*?<([a-z0-9]+)>/i).flatten
vendorids=data.scan(/DisplayVendorID.*?([0-9]+)/i).flatten

vsivsi

vsivsi

Defining and Defending Project Scope

---

This is one of the most critical things!

---

• Problem Statement(s)
• Formal documentation of Project Scope

vsivsi

$ terraform apply

nomad_job.import_snapshot: Refreshing state... (ID: import_snapshot)
nomad_job.import_snapshot: Modifying... (ID: import_snapshot)
nomad_job.import_snapshot: Modifications complete (ID: import_snapshot)

Apply complete! Resources: 0 added, 1 changed, 0 destroyed.

The state of your infrastructure has been saved to the path
below. This state is required to modify and destroy your

vsivsi

# Run this file once. It will restart to finish the MacOS update
# If the developer tools are already installed, it does nothing. So it is safe to run it again.

# Get the names from HOSTNAME env, which comes from DNS reverse lookup
sudo scutil --set ComputerName $HOSTNAME
sudo scutil --set HostName $HOSTNAME
sudo scutil --set LocalHostName $HOSTNAME

# This sets the system clock to UTC, although the System Preferences UI won't show it.
# sudo ln -sf /usr/share/zoneinfo/UTC /etc/localtime