Bandwidth testing
From genomewiki
Jump to navigationJump to search
Machines tested
| machine name | processor speed | memSize | 10 files of size | dd /dev/zero to /dev/shm | cp /dev/shm to /tmp |
|---|---|---|---|---|---|
| hgwdev | Opteron 1150 Mhz | 32 Gb | 1 gB | 800 mB/s | 287 mB/s |
| kolossus | Intel 2261 Mhz | 1 Tb | 1 gB | 1980 mB/s | 192 mB/s |
| okazaki | Intel 1600 Mhz | 2 Gb | 76 mB | 700 mB/s | 90 mB/s |
| mitzie | Intel 400 Mhz | 512 Kb | 18 mB | 113 mB/s | 25 mB/s |
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
