Bandwidth testing

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Revision as of 23:42, 12 May 2010 by Hiram (talk | contribs) (adding copy to hive and rsync)
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Machines tested

machine
name
processor
speed
memSize10 files
of size
dd /dev/zero
to /dev/shm
cp /dev/shm
to /tmp
cp /dev/shm
to hive
rsync /dev/shm
to /dev/shm
hgwdevOpteron
1150 Mhz
32 Gb1 gB800 mB/s287 mB/s54 mB/s144 mB/s
kolossusIntel
2261 Mhz
1 Tb1 gB1980 mB/s192 mB/s41 mB/s120 mB/s
4X rsync
okazakiIntel
1600 Mhz
2 Gb76 mB700 mB/s90 mB/s11.3 mB/s11.5 mB/s
mitzieIntel
400 Mhz
512 Kb18 mB113 mB/s25 mB/sn/a 37 kB/s up
down

Procedure

Sizing files based on available /dev/shm space. Largest file size limited to 1 gB.

The /dev/zero to /dev/shm write is done ten times with a dd command:

 dd if=/dev/zero of=/dev/shm/memToMem.$I.zero bs=200000 count=$ddCount

The /dev/shm copy to /tmp is done ten times with the cp command:

cp -p /dev/shm/memToMem.$I.zero ./memToFile.$I.zero