Bandwidth testing

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Revision as of 18:21, 14 May 2010 by Hiram (talk | contribs) (shm to file copy)
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Units

For these measurements:

  • 1 kB/s = 1,000 bytes per second
  • 1 mB/s = 1,000,000 bytes per second
  • 1 gB/s = 1,000,000,000 bytes per second

Memory:

  • 1 Kb = 1024^2 bytes = 1,048,576 bytes
  • 1 Gb = 1024^3 bytes = 1,073,741,824 bytes
  • 1 Tb = 1024^4 bytes = 1,099,511,627,776 bytes

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
rsync /dev/shm
via rsh
UDT via
UPD
hgwdevOpteron
1150 Mhz
32 Gb1 gB5278 mB/s
10X dd
287 mB/s58 mB/s1638 mB/s
20X rsync
n/a4070 mB/s
10X send
kolossusIntel
2261 Mhz
1 Tb1 gB6700 mB/s
10X dd
192 mB/s58 mB/s120 mB/s
4X rsync
115 mB/s1135 mB/s
okazakiIntel
1600 Mhz
2 Gb75 mB700 mB/s90 mB/s11.3 mB/s11.5 mB/s11.6 mB/s10.7 mB/s
4X send
mitzieIntel
400 Mhz
512 Kb18 mB113 mB/s25 mB/sn/a54.4 kB/s up
316 kB/s down
n/a
cloud0Opteron
2000 Mhz
7.5 Gb288 mB940 mB/s
4X dd
78 mB/sn/a16 mB/s
2X rsync
43 mB/s
3X rsync
46 mB/s
3X send

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

These 10X copies were repeated three times. The slowest measurement of the three times was recorded.

The rsync /dev/shm to /dev/shm was to and from hgwdev. Multiple instances of rsync from kolossus to hgwdev seemed to add together for a total bandwidth higher than a single instance of rsync.

The machine mitzie is at the end of a Santa Cruz DSL line and over a WiFi network connection across the driveway to the garage.