matthiasg

// _decimal.scss | MIT License | gist.github.com/terkel/4373420

// Round a number to specified digits.
//
// @param  {Number} $number A number to round
// @param  {Number} [$digits:0] Digits to output
// @param  {String} [$mode:round] (round|ceil|floor) How to round a number
// @return {Number} A rounded number
// @example
//     decimal-round(0.333)    => 0

matthiasg

#include <cmath>
#include <assert.h>
#include <core/TestPattern.h>


TestPattern::TestPattern() 
  :w(0)
  ,h(0)
  ,frame_num(0)
  ,duration(0)

matthiasg

#Mobile Device Detection via User Agent RegEx

Yes, it is nearly 2012 and this exercise has been done to death in every imaginable language. For my own purposes I needed to get the majority of non-desktop devices on to a trimmed down, mobile optimized version of a site. I decided to try and chase down an up-to-date RegEx of the simplest thing that could possibly work.

I arrived at my current solution after analyzing 12 months of traffic over 30+ US based entertainment properties (5.8M+ visitors) from Jan - Dec 2011.

The numbers solidified my thoughts on the irrelevancy of including browsers/OSes such as Nokia, Samsung, Maemo, Symbian, Ipaq, Avant, Zino, Bolt, Iris, etc. The brass tacks of the matter is that you certainly could support these obscure beasts, but are you really going to test your site on them? Heck, could you even find one?! Unless the folks that pay you are die hard Treo users my guess is "No".

Interestingly enough my research shows that /Mobile/ is more efficient than **/iP(

matthiasg

[root@smartos ~]# UUID="afe2f552-4a35-4c44-8855-a9bac10f27d2"
[root@smartos ~]# vmadm update ${UUID} qemu_extra_opts="-chardev socket,path=/tmp/vm.qga,server,nowait,id=qga0 -device virtio-serial -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0"
Successfully updated VM afe2f552-4a35-4c44-8855-a9bac10f27d2
[root@smartos ~]# vmadm boot ${UUID}
Successfully started VM afe2f552-4a35-4c44-8855-a9bac10f27d2
[root@smartos ~]# sleep 60 # Machine needs to boot up
[root@smartos ~]# echo '{"execute": "guest-ping" }' | socat stdio unix-connect:/zones/${UUID}/root/tmp/vm.qga # Is GA alive?
{"return": {}}
[root@smartos ~]# echo '{"execute": "guest-info" }' | socat stdio unix-connect:/zones/${UUID}/root/tmp/vm.qga # show information about GA
{"return": {"version": "0.12.1", "supported_commands": [{"enabled": true, "name": "guest-set-vcpus"}, {"enabled": true, "name": "guest-get-vcpus"}, {"enabled": true, "name": "guest-network-get-interfaces"}, {"enabled": true, "name": "guest-suspend-hybrid"}, {"enabled": tru

matthiasg

struct MyType {
   value: u32 
}

impl MyType {
    fn new() -> MyType {
        MyType {
            value: 1
        }   
    }

matthiasg

How to insert your signature in a PDF file by using PDFtk

Your signature in all the sheets

1. convert the signature image to PDF file

convert firma.png firma.pdf

matthiasg

How to insert your signature in a PDF file by using PDFtk

Your signature in all the sheets

1. convert the signature image to PDF file

convert firma.png firma.pdf

matthiasg

#!/bin/bash
echo "arc_stats::print -a arcstat_p.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw
echo "arc_stats::print -a arcstat_c.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw
echo "arc_stats::print -a arcstat_c_max.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw

matthiasg

#!/bin/bash
echo "arc_stats::print -a arcstat_p.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw
echo "arc_stats::print -a arcstat_c.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw
echo "arc_stats::print -a arcstat_c_max.value.ui64" | mdb -kw > value.ui64
ui64=$(cat value.ui64)
echo "${ui64:0:16}/Z 0x10000000" | mdb -kw

matthiasg

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t