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Units of Measure in HPC

  • High Performance Computing (HPC) units are:

    • Flop: floating point operation

    • Flops/s: floating point operations per second

    • Bytes: size of data (a double precision floating point number is 8)

  • Typical sizes are millions, billions, trillions…

Mflop/s = 106

flop/sec

Gflop/s = 109

flop/sec

Tflop/s = 1012

flop/sec

Pflop/s = 1015

flop/sec

Eflop/s = 1018

flop/sec

Zflop/s = 1021

flop/sec

Yflop/s = 1024

flop/sec

Mbyte = 220

= 1048576 ~ 106 bytes

Gbyte = 230

~ 109

bytes

Tbyte = 240

~ 1012

bytes

Pbyte = 250

~ 1015

bytes

Ebyte = 260

~ 1018

bytes

Zbyte = 270

~ 1021

bytes

Ybyte = 280

~ 1024

bytes

Mega Giga Tera Peta Exa Zetta Yotta

  • See www.top500.org for current list of fastest machines

13

COMP 422, Spring 2008 (V.Sarkar)

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