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nikAizuddin

;          1         2         3         4         5         6         7
;01234567890123456789012345678901234567890123456789012345678901234567890
;=======================================================================
;+---------------------------------------------------------------------+
;|                                                                     |
;| Example using brk() system call for dynamic memory allocations.     |
;|                                                                     |
;| DON'T CONFUSE that brk() used in C Function is different with brk() |
;| systemcall (systemcall 45 for x86 ASM).                             |
;|                                                                     |

CMCDragonkai

Understanding the Memory Layout of Linux Executables

Required tools for playing around with memory:

• hexdump
• objdump
• readelf
• xxd
• gcore

application2000

These commands are based on a askubuntu answer http://askubuntu.com/a/581497
To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below.
USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING.
ABSOLUTELY NO WARRANTY.

If you are still reading let's carry on with the code.

sudo apt-get update && \
sudo apt-get install build-essential software-properties-common -y && \
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \

bvaughn

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

• Profiling in production
  • Create React App
  • Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

nikic

Why objects (usually) use less memory than arrays in PHP

This is just a small post in response to [this tweet][tweet] by Julien Pauli (who by the way is the release manager for PHP 5.5). In the tweet he claims that objects use more memory than arrays in PHP. Even though it can be like that, it's not true in most cases. (Note: This only applies to PHP 5.4 or newer.)

The reason why it's easy to assume that objects are larger than arrays is because objects can be seen as an array of properties and a bit of additional information (like the class it belongs to). And as array + additional info > array it obviously follows that objects are larger. The thing is that in most cases PHP can optimize the array part of it away. So how does that work?

The key here is that objects usually have a predefined set of keys, whereas arrays don't:

abeluck

About

This is a local copy of the commands from:

• http://www.jmknoble.net/keys/#master-key
• http://www.macfreek.nl/mindmaster/Convert_GPG_keys_to_subkeys
• http://wiki.fsfe.org/Card_howtos/Card_with_subkeys_using_backups/

This guide serves as a reference of collected information necessary for strict management of PGP keys. This includes keeping a master key that always remains

superwills

// Put this in a separate .h file (called "getopt.h").
// The prototype for the header file is:
/*
#ifndef GETOPT_H
#define GETOPT_H

int getopt(int nargc, char * const nargv[], const char *ostr) ;

#endif
*/

rvido

#!/bin/bash
#------------------------------------------------
# Setup Ubuntu 16.04 with xRDP via MATE-Desktop
#------------------------------------------------
#

sudo apt update
sudo apt install xrdp
sudo apt install mate-core mate-desktop-environment mate-notification-daemon
sudo sed -i.bak '/fi/a #xrdp multiple users configuration \n mate-session \n' /etc/xrdp/startwm.sh

ii64

ii64@earth:/abc$ sudo fio --name=global --rw=randread --size=640m --name=job1 --name=job2
job1: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1
job2: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1
fio-3.29-99-g93365
Starting 2 processes
job1: Laying out IO file (1 file / 640MiB)
job2: Laying out IO file (1 file / 640MiB)
Jobs: 2 (f=2): [r(2)][91.7%][r=118MiB/s][r=30.2k IOPS][eta 00m:01s]
job1: (groupid=0, jobs=1): err= 0: pid=22040: Sat Feb 19 19:23:23 2022
  read: IOPS=15.0k, BW=58.5MiB/s (61.4MB/s)(640MiB/10931msec)