Enelar

vm.swappiness=90
vm.dirty_ratio=50
vm.dirty_background_ratio=30
vm.dirty_writeback_centisecs=60000
vm.vfs_cache_pressure=150
vm.laptop_mode=1
vm.page-cluster=1
vm.min_free_kbytes=2048
vm.memory_failure_recovery=1
vm.panic_on_oom=1

Jeraimee

This sysctl.conf is used on a CentOS 6.2 system doing heavy tcp comms using ActiveMQ.

fs.file-max = 999999

net.core.netdev_max_backlog = 10240
net.core.somaxconn = 10240

net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.rp_filter = 1

yp2800

/etc/sysctl.conf
kernel.ctrl-alt-del=1
kernel.sysrq=0
kernel.panic=10
kernel.core_pattern=/dev/null
kernel.shmmax=262324224
fs.file-max=128000
net.core.wmem_default=200100
net.core.rmem_default=200100
net.core.wmem_max=3202200

PFortin93

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.
#
# Use '/sbin/sysctl -a' to list all possible parameters.

# Controls IPv4 Security
net.ipv4.ip_forward=0
net.ipv4.conf.all.send_redirects=0

aburan28

ARCH=$(uname -m)

which bc
if [ $? -ne 0 ]; then
    echo "This script require GNU bc, cf. http://www.gnu.org/software/bc/"
    echo "On Linux Debian/Ubuntu you can install it by doing : apt-get install bc"
fi

echo "Update sysctl for $host"

ftkro

net.ipv4.ip_forward = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.eth0.send_redirects = 0
net.ipv4.conf.lo.send_redirects = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.eth0.accept_redirects = 0
net.ipv4.conf.lo.accept_redirects = 0
net.ipv4.tcp_fastopen = 0x403

kandelvijaya

//: Playground - noun: a place where code can play

import UIKit

//Most precise time keeper
// for more information on the benchmarks go to www.kandelvijaya.com

func timeBlockWithMach(_ block: () -> Void) -> TimeInterval {
    var info = mach_timebase_info()
    guard mach_timebase_info(&info) == KERN_SUCCESS else { return -1 }

piaoger

// It's tested on ios 8.2 ..

// Apple document about virtual memory: 
//    Both OS X and iOS include a fully-integrated virtual memory system that you cannot turn off; it is always on. 
//    https://developer.apple.com/library/mac/documentation/Performance/Conceptual/ManagingMemory/Articles/AboutMemory.html
// Discussing mmap on ios:
//    http://stackoverflow.com/questions/13425558/why-does-mmap-fail-on-ios
//    http://stackoverflow.com/questions/9184773/is-there-a-practical-limit-on-the-number-of-memory-mapped-files-in-ios

#include <sys/mman.h>

erkattak

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:networkSecurityConfig="@xml/network_security_config">

leandromoreira

% it creates a simple gray image (4x4)
I = [255, 255, 30, 100 
    255, 50, 90, 20 
    70, 70, 20, 10 
    100, 20, 10, 0];
% it converts it to grayscale
I = mat2gray(I);
% shows it 
imshow(I);