#mhash

¿balmy break?

hospices are shaped like crocodiles . parliaments have foundations in a golden ratio rectangle ..appro;x

language used conversationally as safely relevantly creative can necessitate specialist role play

.. .... ..esp as when road system drive side laws do not cancel spins across human digit sum of hours in a planetary set of timezones .. ..as accords with african origin of species dictating with pangea the central african drive side dilemma.. ..

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politics could be so much easier ..for politicians.. and involve far more culpability to the methods of jurisprudence

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generating political conjectures ::

simplistic architecture

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♤ linebreeds polymaths

archijefjuge

sLwPiLsjIf

♡ xgHLJeFj

I don't fancy myself much of a computer nerd... but with all noise about Bitcoin in the news lately, I figured... "Hey - Let's see how fast an Arduino can process SHA256 bit hashes. Other people on the internet have wondered this too... and here's your answer:

SLOW AS DEATH.

But how slow exactly? And how efficiently?

I ran the code on an Arduino Pro with a ATMEGA328P chip, 8 bits, and clocked at 16 MHZ.  At that speed, we're generating 10.154 hashes per second, and using a paltry 0.09 watts of juice. I didn't desolder the power LED from the board before taking this measurement, so technically it takes even less power than this.  SO, where does this leave us?  Well... about a million times slower.. No really... actually more like 1.2 million times slower than using the chip on your 3D graphics card to calculate these hashes, which it can do at a rate of 10-15 MILLION per second. Granted, the GPU takes a LOT more power than an Arduino, but almost 110,000 watts?  Nope. Try 60 watts. 

The take-away from this? It was a fun exercise, but Mining Bitcoins on an Arduino, while technically possible, is incredibly inefficient and slow. And those are the numbers to prove it. 

После перехода с самосборного пакет php 5.2 на php 5.3 из убунтовских реп в лог стало валиться примерно следующее:

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/mhash.so' - /usr/lib/php5/20090626/mhash.so: cannot open shared object file: No such file or directory in Unknown on line 0

Поиск в гугле посоветовал удалить файлик mhash.ini, но его у меня нет. Проблема оказалось в следующем: php брал настройки из php.ini, который контролится puppet'ом и почти без изменений переехал из 5.2 в 5.3, а в нем уже была строчка, загружающая mhash.so

Строчку я закомментил и все стало круто.