Posts Tagged ‘macbook pro’

Just upgraded my tools

Monday, August 10th, 2009

No, I didn’t answer to these emails that ask me to buy pills or do some surgery on my most intimate parts :-)

I upgraded from an aluminium 15″ MacBook Pro eto an unibody 17″ MacBook Pro, with 30% faster CPU, 25% faster GPU, 2X more GPU memory, and a bigger … screen!

It’s a pleasure to work with a so good computer, and having both MCP79/GeForce 9400M IGP (that supported Pinned Mapped Memory) and GeForce 9600M GT GPU, I could optimize for both and take into account the performance-level of nVidia’s actual IGP, that is all but negligeable, with peak Gflop/s over thos of the Dual-Core CPU of the Macs.

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sha1 contest : win iPhone, MacBook Pro and more…

Saturday, July 18th, 2009

I saw a sha1 contest that will start on next monday and will run for 30 hours.

Too late for me, but as it is relatively simple to do a sha1 hashed password attack with CUDA, I plan to do a little tool for that, just for the fun…

You just have to avoid generating the useless intermediate 2560bits buffer, using 16 internal registers instead + 8 for computing, and as my last post stated it, with macro-threading, you could occupate nearly 100% GPU-cycle of each scalar-processor while checking a global-memory entry that will flag if any thread as found the password.

Will be simpler using macros and manully unlooping the whole process, as the best CPU implementation do! (I think it’s on BSD?)

No thread synchronization (stopping!) needed, no communication penalty, no need to access Shared Memory (anyway coalescing will be easy by nterleaving datas :-) )

SHA1 is typically an algorithm that could be ported easily to CUDA!

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