Name

gfperf-parallel-read — Gfarm measure file read performance

Synopsis

gfperf-parallel-read [-t, --testdir test directory] [-m, --gfarm2fs gfarm2fs mount point] [-l, --filesize file size] [-b, --bufsize buffer size] [-r, --random random] [-g, --gfsd gfsd name] [-k, --timeout timeout seconds] [-n, --name group name] [-w, --wait start time]

DESCRIPTION

This command mesures file read performance of specified size of file in test directory. The test file is automatically created and 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 read test file. The default is 4K. (1K=2^10)

-r, --random random

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

-g, --gfsd gfsd name

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

-k, --timeout timeout seconds

Maximum read time in seconds. This comannd measures how much data to be read 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.