dt.examples

Linux磁盘测试的源代码,测试磁盘的读写性能

	This file contains various 'dt' examples used to show its'
capabilities and to help get new users started.  A short description
prefaces each test to describe the nature of the test being performed.
Several of the latter tests, are real life problems which were either
uncovered directly by 'dt', or were easily reproduced using a specific 'dt'
command line which helps trouble-shooting problems.

	On DEC systems, next to the device name in the total statistics,
you'll notice the device name and device type.  This information is obtained
by using the DEC specific DEVIOCGET I/O control command.  This is very for
identifying the device under test, especially since performance and various
problems are device specific.  For non-Digital systems you'll only see the
device type displayed, not the real device name, which is setup based on known
system dependent device naming conventions (i.e., "/dev/ser" prefix for QNX
serial ports).
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TEST DESCRIPTION:  This test does read testing of a raw disk partition with
data comparisons disabled, using the POSIX Asynchronous I/O API (AIO is only
supported on DEC OSF/1 at this time).

% dt if=/dev/rrz3c bs=8k limit=50m disable=compare enable=aio
Total Statistics:
      Input device/file name: /dev/rrz3c (Device: RZ25, type=disk)
           Data pattern read: 0x39c39c39 (data compare disabled)
     Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes)
      Average transfer rates: 2227853 bytes/sec, 2175.637 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m23.53s
           Total system time: 00m01.36s
             Total user time: 00m00.20s
               Starting time: Wed Sep 15 12:47:55 1993
                 Ending time: Wed Sep 15 12:48:18 1993

% 
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TEST DESCRIPTION:  This test does a write/read verify pass of a 50Mb file
through the UFS file system, with the file disposition set to "keep", so
the test file is not deleted.  Normally, 'dt' deletes the test files
created before exiting.

% dt of=/usr/tmp/x bs=8k limit=50m dispose=keep
Write Statistics:
     Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes)
      Average transfer rates: 1530768 bytes/sec, 1494.891 Kbytes/sec
      Total passes completed: 0/1
       Total errors detected: 0/1
          Total elapsed time: 00m34.25s
           Total system time: 00m03.48s
             Total user time: 00m06.70s

Read Statistics:
     Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes)
      Average transfer rates: 2243743 bytes/sec, 2191.155 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m23.36s
           Total system time: 00m02.05s
             Total user time: 00m13.95s

Total Statistics:
     Output device/file name: /usr/tmp/x
   Data pattern read/written: 0x39c39c39
     Total records processed: 12800 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 104857600 (102400.000 Kbytes, 100.000 Mbytes)
      Average transfer rates: 1819918 bytes/sec, 1777.264 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m57.61s
           Total system time: 00m05.55s
             Total user time: 00m20.65s
               Starting time: Wed Sep 15 13:42:05 1993
                 Ending time: Wed Sep 15 13:43:03 1993

% ls -ls /usr/tmp/x
51240 -rw-r--r--   1 rmiller  system   52428800 Sep 15 13:42 /usr/tmp/x
% od -x < /usr/tmp/x
0000000  9c39 39c3 9c39 39c3 9c39 39c3 9c39 39c3
*
310000000
% 
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TEST DESCRIPTION:  This test does a read verify pass of the 50Mb file
created in the previous test, using the memory mapped I/O API (mmap is only
supported on SUN/OS and DEC OSF/1 at this time).

% dt if=/usr/tmp/x bs=8k limit=50m enable=mmap
Total Statistics:
      Input device/file name: /usr/tmp/x
           Data pattern read: 0x39c39c39
     Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes)
      Average transfer rates: 2282821 bytes/sec, 2229.318 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m22.96s
           Total system time: 00m01.13s
             Total user time: 00m07.73s
               Starting time: Wed Sep 15 13:49:10 1993
                 Ending time: Wed Sep 15 13:49:33 1993
% rm /usr/tmp/x

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TEST DESCRIPTION:  This test does a write/read verify pass to a QIC-320 1/4"
tape drive.  Please notice the total average transfer rate.  This lower rate
is caused by the tape rewind performed after writing the tape.  This rewind
time is not included in the write/read times, but is part of the total time.

% dt of=/dev/rmt0h bs=64k limit=10m
Write Statistics:
     Total records processed: 160 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 10485760 (10240.000 Kbytes, 10.000 Mbytes)
      Average transfer rates: 157365 bytes/sec, 153.677 Kbytes/sec
      Total passes completed: 0/1
       Total errors detected: 0/1
          Total elapsed time: 01m06.63s
           Total system time: 00m00.10s
             Total user time: 00m01.33s

Read Statistics:
     Total records processed: 160 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 10485760 (10240.000 Kbytes, 10.000 Mbytes)
      Average transfer rates: 194842 bytes/sec, 190.276 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m53.81s
           Total system time: 00m00.08s
             Total user time: 00m02.78s

Total Statistics:
     Output device/file name: /dev/rmt0h (Device: TZK10, type=tape)
   Data pattern read/written: 0x39c39c39
     Total records processed: 320 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 20971520 (20480.000 Kbytes, 20.000 Mbytes)
      Average transfer rates: 115950 bytes/sec, 113.233 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 03m00.86s
           Total system time: 00m00.18s
             Total user time: 00m04.11s
               Starting time: Wed Sep 15 11:50:36 1993
                 Ending time: Wed Sep 15 11:53:50 1993
% 
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TEST DESCRIPTION:  This test does a write/read verify pass of 2 tape files
to a DEC TZ86 tape drive using variable length records ranging from 10 Kbytes
to 100 Kbytes using the default increment value of 1 byte.

% dt of=/dev/rmt1h min=10k max=100k limit=5m files=2
Write Statistics:
     Total records processed: 1000 with min=10240, max=102400, incr=1
     Total bytes transferred: 10485760 (10240.000 Kbytes, 10.000 Mbytes)
      Average transfer rates: 642641 bytes/sec, 627.579 Kbytes/sec
      Total passes completed: 0/1
       Total files processed: 2/2
       Total errors detected: 0/1
          Total elapsed time: 00m16.31s
           Total system time: 00m00.28s
             Total user time: 00m01.26s

Read Statistics:
     Total records processed: 1000 with min=10240, max=102400, incr=1
     Total bytes transferred: 10485760 (10240.000 Kbytes, 10.000 Mbytes)
      Average transfer rates: 214725 bytes/sec, 209.693 Kbytes/sec
      Total passes completed: 1/1
       Total files processed: 2/2
       Total errors detected: 0/1
          Total elapsed time: 00m48.83s
           Total system time: 00m00.45s
             Total user time: 00m30.95s

Total Statistics:
     Output device/file name: /dev/rmt1h (Device: TZ86, type=tape)
   Data pattern read/written: 0x39c39c39
     Total records processed: 2000 with min=10240, max=102400, incr=1
     Total bytes transferred: 20971520 (20480.000 Kbytes, 20.000 Mbytes)
      Average transfer rates: 229322 bytes/sec, 223.948 Kbytes/sec
      Total passes completed: 1/1
       Total files processed: 4/4
       Total errors detected: 0/1
          Total elapsed time: 01m31.45s
           Total system time: 00m00.75s
             Total user time: 00m32.21s
               Starting time: Mon Sep 13 15:29:23 1993
                 Ending time: Mon Sep 13 15:31:00 1993
% 
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TEST DESCRIPTION:  This test does writing/reading through a pipe.  Notice
the special character '-' which indicates write standard out/read standard in.

% dt of=- bs=8k limit=1g disable=stats | dt if=- bs=8k limit=1g
Total Statistics:
      Input device/file name: -
           Data pattern read: 0x39c39c39
     Total records processed: 131072 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 1073741824 (1048576.000 Kbytes, 1024.000 Mbytes)
      Average transfer rates: 2334644 bytes/sec, 2279.926 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 07m39.91s
           Total system time: 00m17.65s
             Total user time: 04m44.66s
               Starting time: Wed Sep 15 11:40:08 1993
                 Ending time: Wed Sep 15 11:47:48 1993

% 
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TEST DESCRIPTION:  This test does writing/reading through a fifo (named pipe).
This is similar to the previous test, except a fifo file is created, and a
single invocation of 'dt' is used for testing.

% mkfifo NamedPipe
% ls -ls NamedPipe
0 prw-r--r--   1 rmiller  system         0 Sep 16 09:52 NamedPipe
% dt of=NamedPipe bs=8k limit=1g enable=loopback
Total Statistics:
     Output device/file name: NamedPipe (device type=fifo)
        Data pattern written: 0x39c39c39 (read verify disabled)
     Total records processed: 131072 @ 8192 bytes/record (8.000 Kbytes)
     Total bytes transferred: 1073741824 (1048576.000 Kbytes, 1024.000 Mbytes)
      Average transfer rates: 2264402 bytes/sec, 2211.330 Kbytes/sec