Forgot your password?
typodupeerror

Comment: Re:WTF?! have these kids never heard of ESD? (Score 1) 161

by zbox4 (#41872515) Attached to: How To Build a Supercomputer In 24 Hours
no nodes came ready - we assembled/installed all the motherboards, cpu's, memory, disks, power etc.. on custom made shelves. they are arranged on four sides of a cube and we cool everything by directly blowing cold air into the centre of the frame. a custom insert distributes even airflow over the shelves. its a compact design and easy to maintain/upgrade. grounding straps essential? what is your source for that??

Comment: Re:Couldn't it be smaller ? (Score 1) 161

by zbox4 (#41871599) Attached to: How To Build a Supercomputer In 24 Hours
see my reply to the post about software. we have some codes that run on GPUs but the main astrophysics codes are too complex to re-write or to fit onto a GPU. some subroutines can use the GPU as an accelerator and we hope to find the extra ~100,000 money units, to put GPUs on all the motherboards at some point.

Comment: Re:News For Nerds (Score 1) 161

by zbox4 (#41871419) Attached to: How To Build a Supercomputer In 24 Hours
i posted the original zBox1 specs/website here about eight years ago. our server was immediately slashdotted & crashed. quickly fixed it and we had over a million page views in 2 days ;) its the same design - shelves of motherboards arranged in a cube. cold air is blown into the center of the machine which has a custom design to allow even air flow over all the shelves. we could possibly run the machine without the cpu coolers which would double the density. its a little over one cubic metre and needs about 40kW of power.

Comment: Re:Software (Score 5, Informative) 161

by zbox4 (#41871393) Attached to: How To Build a Supercomputer In 24 Hours
we use various astrophysics simulation codes, i.e. GASOLINE, PKDGRAV, RAMSES etc. some are developed by us. they are all MPI and solve the coupled gravitational and hydrodynamic equations that can describe the dark matter and baryons evolving in the expanding universe. memory and speed of the computer limit the resolution that can be attained, so various "sub-grid" physical processes have to be treated carefully. for cosmological simulations we know the initial conditions - those are the fluctuations that we can read off the microwave background. they show the universe was hot, dense and smooth early on. the codes follow the perturbations into the non-linear regime when dark matter haloes, stars and galaxies form. we can then compare the properties of simulated structures with observational data etc.

Comment: Specs: (Score 1) 1

by zbox4 (#41864983) Attached to: how we built a supercomputer in 24hrs
Hardware: CPUs: 384 Intel Xeon E5-2660 (8 cores @ 2.2 GHz, 95 W), 3072 cores in total Main Boards: 192 Supermicro X9DRT-IBQF (2 CPUs per node) on-board QDR Infiniband RAM: Hynix DDR3-1600, 4 GB/core, 64 GB/node, 12.3 TB in total SSD: 192 OCZ 128 GB high performance Vertex 4 drives, 24.6 TB in Total HPC Network: QLogic/Intel QDR Infiniband in 2:1 fat tree (9 leaf and 3 core switches) Gbit Ethernet and seerate dedicated 100 Mbit management networks Power usage (full load): 44 kW Dimensions (L x W x H): 1.5m x 1.5m x 1.7m Number of Cables: Power: 112 IB: 300 Ethernet: 388 Cost: under 750'000 CHF System Configuration OS: Scientific Linux version 6.3 Queue System: Slurm Swap: 8 GB on node-local SSD drive Temp Files: 110 GB on node-local SSD drive Booting: from node-local SSD, or over Ethernet Storage System (existing): Capacity: 684 TB formatted Raid-6 Lustre file system with 50 OSTs 342 x 1.5 TB HDD and 171 x 2.0 TB HDD Physical dimensions: 48 standard rack units 10 Gb Ethernet and 40 Gb (QDR) Infiniband 3 Controllers using Intel E5645 2.4 GHz CPUs Tape Robot: Capacity: 800 TB, 437 tape slots 4 x LTO-5 drives and 2 x LTO-3 drives 54 TB high speed tape cache (108 TB raw storage) 40 Gb (QDR) Infiniband connected
Supercomputing

+ - how we built a supercomputer in 24hrs-> 1

Submitted by Anonymous Coward
An anonymous reader writes "Time lapse video of students and postdocs at the University of Zurich constructing the zBox4 supercomputer. The machine has a theoretical compute capacity of ~1% of the human brain and will be used for simulating the formation of stars, planets and galaxies."
Link to Original Source

Arithmetic is being able to count up to twenty without taking off your shoes. -- Mickey Mouse

Working...