dvliman

;; vm.clj

(aws/invoke state/ec2
  {:op       :RunInstances
   :request {:InstanceType      "c5d.2xlarge"
   :MaxCount          1
   :MinCount          1
   :SubnetId          "subnet-id"
   :ImageId           "ami-id"
   :SecurityGroupIds  ["sg-id"]

dvliman

GNU/Linux kernel internals

Linux kernel booting process. Part 1.

If you read my previous blog posts, you can note that sometime ago I have started to get involved low-level programming. I wrote some posts about x86_64 assembly programming for Linux. In the same time I started to dive into GNU/Linux kernel source code. It is very interesting for me to understand how low-level things works, how programs runs on my computer, how they located in memory, how kernel manages processes and memory, how network stack works on low-level and many many other things. I decided to write yet another series of posts about GNU/Linux kernel for x86_64.

Note, that I'm not professional kernel hacker and I don't write code for kernel at work, just a hobby. I just like low-level stuff and it is interesting to me how these

dvliman

import os
import pickle
import warnings

import numpy as np
import pandas as pd
from sklearn.model_selection import train_test_split
from tensorflow.keras.callbacks import EarlyStopping
from tensorflow.keras.layers import Dense
from tensorflow.keras.layers import Dropout

dvliman

% -*- coding: utf8 -*-
%% Benchmarking code samples.
%% Each benchmark is launched in it's own process to eliminate GC influence.
-module(benchmark).
-export([main/0]).


main() ->
    % {Test name, TestFun1, TestFun2, Constructor}
    % Constructor runtime isn't counted

dvliman

# pgTAP extension
comment = 'Unit testing for PostgreSQL'
default_version = '1.1.0'
module_pathname = '$libdir/pgtap'
requires = 'plpgsql'
relocatable = true
superuser = false

dvliman

[root@ip-172-31-19-212 certbot]# cat certbot-auto
#!/bin/sh
#
# Download and run the latest release version of the Certbot client.
#
# NOTE: THIS SCRIPT IS AUTO-GENERATED AND SELF-UPDATING
#
# IF YOU WANT TO EDIT IT LOCALLY, *ALWAYS* RUN YOUR COPY WITH THE
# "--no-self-upgrade" FLAG
#

dvliman

# Turn on the simulator screen capture
xcrun simctl io booted recordVideo ~/simulator.mov

# Convert the iPhone 6s screen shot into a gif:
ffmpeg -i ~/simulator.mov -vf scale=320:-1 -r 6 -f gif -y simulator.gif

dvliman

(defn pgobj->clj [^org.postgresql.util.PGobject pgobj]
  (let [type (.getType pgobj)
        value (.getValue pgobj)]
    (case type
      "json" (cheshire.core/parse-string value true)
      "jsonb" (cheshire.core/parse-string value true)
      "citext" (str value)
      value)))

(extend-protocol next.jdbc.result-set/ReadableColumn

dvliman

  ;; File: src/some_app/middleware.clj  
  (defn open-gates [request]
       true)
  (def rules [{:pattern #"^/admin.*"
         :handler admin-access
         :redirect "/notauthorized"},
        {:pattern #"^\/vclass.*"
         :handler user-access
         :redirect "/notauthorized"},
        {:pattern #"^\/api.*"

dvliman

(defn ->Function
  [f]
  (reify java.util.function.Function
    (apply [_ obj] (f obj))))
(defn future-map
  [cf f]
  (.thenApply cf (->Function f)))
(defn future->ch
  ([cf]
   (future->ch cf (async/chan 1) true))