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@lizrice
lizrice / hello_map.py
Last active July 19, 2023 08:20
eBPF hello world
#!/usr/bin/python
from bcc import BPF
from time import sleep
# This outputs a count of how many times the clone and execve syscalls have been made
# showing the use of an eBPF map (called syscall).
program = """
BPF_HASH(syscall);
@zchee
zchee / cgo.md
Last active June 20, 2025 08:51
cgo convert list

See also, http://libraryofalexandria.io/cgo/

Using Go cgo

cgo has a lot of trap.
but Not "C" pkg also directory in $GOROOT/src. IDE's(vim) Goto command not works.

So, Here collect materials.

@elithrar
elithrar / server.go
Last active May 17, 2024 02:08
Custom Handlers and Avoiding Globals in Go Web Applications - http://elithrar.github.io/article/custom-handlers-avoiding-globals/ - more recent take here: http://elithrar.github.io/article/http-handler-error-handling-revisited/
package main
import (
"fmt"
"log"
"net/http"
"html/template"
"github.com/gorilla/sessions"
@demisx
demisx / active_record_objects_autosave.md
Last active July 4, 2024 14:20
When Active Record Child Objects are Autosaved in Rails

belongs_to:

  1. Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

  1. When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
  2. In addition, any object being replaced is also automatically saved, because its foreign key will change too
  3. If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
  4. If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.
@philfreo
philfreo / gist:7257723
Created October 31, 2013 21:44
Facebook Perl source code from 2005. When browsing around thefacebook.com in 2005 the server spit out some server-side source code rather than running it. I believe this was for their old graph feature that let you visualize the graph between all your friends. The filename is `mygraph.svgz` and contains some gems such as a commented out "zuck" d…
#!/usr/bin/perl
use Mysql;
use strict;
use vars qw($school_name);
use vars qw($pass);
require "./cgi-lib.pl";
@kwent
kwent / AnimatedActivity.java
Created June 27, 2013 11:28
Activity transition animations like the Vine Android application. - See more at: http://blog.quent.in/index.php/2013/06/activity-transition-animations-like-the-vine-android-application/
public class AnimatedActivity extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//opening transition animations
overridePendingTransition(R.anim.activity_open_translate,R.anim.activity_close_scale);
}
@dypsilon
dypsilon / frontendDevlopmentBookmarks.md
Last active November 16, 2025 11:36
A badass list of frontend development resources I collected over time.
@msg555
msg555 / gangnam.py
Created January 27, 2013 21:21
Create plots from discrete set of points. It's set to connect the first and last point together, currently.
#!/usr/bin/python
#
# Example usage
# $ ./gangnam.py | gnuplot
# 9
# 0 0
# 1 1
# 2 2
# 0 2
# 1 1
@aishraj
aishraj / dotsandboxes.cc
Created June 9, 2012 13:27 — forked from rvivek/dotsandboxes.cc
Dots and Boxes
#include<iostream>
using namespace std;
#define odd(x) (x&1)
#define even(x) (!(x&1))
int main(){
int x;
cin >> x;
@jboner
jboner / latency.txt
Last active December 13, 2025 00:11
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD