19 May 2012
gfperf-parallel-write 1 Gfarm
gfperf-parallel-write Gfarm measure file write performance
`gfperf-parallel-write` -t, --testdir test directory -m, --gfarm2fs gfarm2fs mount point -l, --filesize file size -b, --bufsize buffer size -r, --random random -g, --gfsd gfsd name -o, --overwrite overwrite flag -k, --timeout timeout seconds -n, --name group name -w, --wait start time

## DESCRIPTION

This command mesures file write performance of specified size of file in test directory. The test file is automatically created and removed. If overwrite flag is on, test file is not removed to be reused again.

This command is expected to be called by gfperf.rb in parallel.

## OPTIONS

`-t, --testdir` test directory

  Test file is created in test directory. Specify only gfarm url (that begins with gfarm:///) . The default is gfarm:///tmp .

`-m, --gfarm2fs` gfarm2fs mount point

  Specify gfarm2fs mount point.

`-l, --filesize` file size

  File size to be created. The default is 1M. (1G=2^20)

`-b, --bufsize` buffer size

  Buffer size to write test file. The default is 4K. (1K=2^10)

`-r, --random` random

  Only if this option is specified, Writes test file randomly. Option parameter is free. If this option is omitted, this command writes test file sequentially.

`-g, --gfsd` gfsd name

  Specify gfsd name on which test file is created. If this option is omitted, gfmd determines automatically.

`-o, --overwrite` overwrite flag

  Only if this option is specified, Overwrite test file. Option parameter is free. If this option is omitted, this command appends test data on 1 byte file.

`-k, --timeout` timeout seconds

  Maximum write time in seconds. This comannd measures how much data to be written in this seconds.

`-n, --name` group name

  Group name in parallel execution.

`-w, --wait` start time

  Start time specified by gfperf.rb. This command waits until start time. Start time is written in UTC (YYYY-MM-DDThh:mm:ssZ) and must be in 10 seconds from current time.