Alexandru Bogdan Bâgu alexandrubagu
alexandrubagu
/ gist:d53530953cb029460089a0806adf6620
Last active
May 15, 2024 14:08
append_vs_prepend
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| defmodule ListTesting do | |
| def append([]), do: [] | |
| def append([head | tail]), do: append(head) ++ append(tail) | |
| def append(head) when is_integer(head), do: [transform(head)] | |
| def prepend_and_reverse(list), do: do_prepend(list, []) | |
| defp do_prepend([], acc), do: Enum.reverse(acc) | |
| defp do_prepend([head | tail], acc), do: do_prepend(tail, [transform(head) | acc]) | |
| defp transform(x), do: x * 2 |
alexandrubagu
/ PostgreSQL Bloat
Created
October 25, 2022 13:42
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| WITH constants AS ( | |
| -- define some constants for sizes of things | |
| -- for reference down the query and easy maintenance | |
| SELECT current_setting('block_size')::numeric AS bs, 23 AS hdr, 8 AS ma | |
| ), | |
| no_stats AS ( | |
| -- screen out table who have attributes | |
| -- which dont have stats, such as JSON | |
| SELECT table_schema, table_name, | |
| n_live_tup::numeric as est_rows, |
alexandrubagu
/ gist:3227318d816cfe77d5310a75e29366f2
Created
October 14, 2020 21:52
godot shader draw lines triangle
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| shader_type canvas_item; | |
| const float Thickness = 0.003; | |
| float drawLine(vec2 uv,vec2 f, vec2 p1, vec2 p2) { | |
| float a = abs(distance(p1, uv.xy)); | |
| float b = abs(distance(p2, uv.xy)); | |
| float c = abs(distance(p1, p2)); |
alexandrubagu
/ gist:6cadcdfae5da8bb8fd1a61eef6577052
Last active
October 14, 2020 20:29
godot shader
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| shader_type canvas_item; | |
| render_mode unshaded, blend_disabled; | |
| vec3 random3(vec3 c) { | |
| float j = 4096.0*sin(dot(c,vec3(17.0, 59.4, 15.0))); | |
| vec3 r; | |
| r.z = fract(512.0*j); | |
| j *= .125; | |
| r.x = fract(512.0*j); | |
| j *= .125; |
alexandrubagu
/ sysctl tunning
Created
November 22, 2018 16:11
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| sysctl -w fs.file-max="9999999" | |
| sysctl -w fs.nr_open="9999999" | |
| sysctl -w net.core.netdev_max_backlog="4096" | |
| sysctl -w net.core.rmem_max="16777216" | |
| sysctl -w net.core.somaxconn="65535" | |
| sysctl -w net.core.wmem_max="16777216" | |
| sysctl -w net.ipv4.ip_local_port_range="1025 65535" | |
| sysctl -w net.ipv4.tcp_fin_timeout="30" | |
| sysctl -w net.ipv4.tcp_keepalive_time="30" | |
| sysctl -w net.ipv4.tcp_max_syn_backlog="20480" |
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| [Unit] | |
| Description=personal_website | |
| After=network.target | |
| [Service] | |
| WorkingDirectory=/home/alexandrubagu/apps/personal_website | |
| ExecStart=/home/alexandrubagu/apps/personal_website/bin/personal_website start | |
| ExecStop=/home/alexandrubagu/apps/personal_website/bin/personal_website stop | |
| Environment="PORT=7000" | |
| Environment=LANG=en_US.UTF-8 |
alexandrubagu
/ website_virtualhost
Last active
June 13, 2020 11:48
nginx & ssl letsencrypt virtualhost
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| # extract Phoenix app upstream for better readability | |
| upstream app { | |
| server localhost:5000; | |
| } | |
| # hide server information | |
| http { | |
| server_tokens off; | |
| } |
alexandrubagu
/ metrics.ex
Last active
May 8, 2018 08:11
— forked from anonymous/mtrics.ex
elixir plug metrics
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| defmodule Mtrics do | |
| @behaviour Plug | |
| import Plug.Conn | |
| def init(opts \\ []), do: opts | |
| def call(conn, opts) do | |
| start = System.monotonic_time() | |
| register_before_send(conn, fn conn -> |