# PPT - Leibniz Institute for Age Research

Biotechnology

Oct 4, 2013 (4 years and 9 months ago)

94 views

Jürgen
Sühnel

jsuehnel@fli
-
leibniz.de

Supplementary Material: http://www.fli
-
leibniz.de/www_bioc/3D/

-

2013
-

3D
Structures

of

Biological
Macromolecules

Floating Point
Operations

and Benchmarking of Computer Performance

Leibniz Institute
for

Age Research, Fritz Lipmann Institute,

Jena
Centre

for

Bioinformatics

Jena / Germany

Floating Point Operation

-

A Floating Point Operation is a mathematical operation with floating point numbers.

-

Floating point number:

23.452 = 23452 x 10
-
3

significant digits x base

exponent

-

They cover easily extremely large number ranges between astronomy

and particle physics.

-

A Floating Point Unit is a part of a computer system specifically designed to carry out

operations on floating point numbers.

-

FLOPS is in computing to a measure of computer performance
-

-
floating point operations per second (note plural and per second).

Floating Point Operation

Name

FLOPS

yotta
FLOPS

10
24

zetta
FLOPS

10
21

exa
FLOPS

10
18

peta
FLOPS

10
15

tera
FLOPS

10
12

giga
FLOPS

10
9

mega
FLOPS

10
6

kilo
FLOPS

10
3

Floating Point Operation

Theoretical

Peak Performance

GFLOPS =

(CPU
-
Takt in GHz)
×

(Anzahl der CPU
-
Kerne)
×

(CPU
-
Instruktionen pro Takt)
×

(Anzahl der CPU im Rechnerknoten)

Beispiel:

Zwei Sockel
-
Server mit 8 Kernen und einer Taktfrequenz von 2.6 GHz

und 8 Instruktionen per Zyklus (z.B. Intel E5
-
2600
-
Reihe)

GFLOPS = 2.6 x 8 x 8 x 2 = 332.8 GFLOPS

Adjusted Peak Performance is significantly lower.

Benchmarking

LINPACK

software library for performing numerical linear algebra on computers,

is now widely used for measuring computer performance

Linpack Benchmark
-

Java Version
´
-

(http://www.netlib.org/benchmark/linpackjava/)

The problem solved is a dense 500x500 system of linear equations with one right hand side, Ax=b.

The matrix is generated randomly and the right hand side is constructed so the solution has all components

equal to one.

800

1100 Mflops/s

TOP500 List

Measured in Pflops.

TOP500 List