Bandwidth testing
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Machines tested
machine name | processor speed | memSize | 10 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 |
---|---|---|---|---|---|---|---|
hgwdev | Opteron 1150 Mhz | 32 Gb | 1 gB | 800 mB/s | 287 mB/s | 54 mB/s | 144 mB/s |
kolossus | Intel 2261 Mhz | 1 Tb | 1 gB | 1980 mB/s | 192 mB/s | 41 mB/s | 120 mB/s 4X rsync |
okazaki | Intel 1600 Mhz | 2 Gb | 76 mB | 700 mB/s | 90 mB/s | 11.3 mB/s | 11.5 mB/s |
mitzie | Intel 400 Mhz | 512 Kb | 18 mB | 113 mB/s | 25 mB/s | n/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