dt.examples

Linux磁盘测试的源代码,测试磁盘的读写性能

      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 07m54.18s
           Total system time: 00m21.80s
             Total user time: 02m14.96s
               Starting time: Thu Sep 16 09:42:24 1993
                 Ending time: Thu Sep 16 09:50:18 1993

Total Statistics:
      Input device/file name: NamedPipe (device type=fifo)
           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: 2264402 bytes/sec, 2211.330 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 07m54.18s
           Total system time: 00m19.90s
             Total user time: 04m44.01s
               Starting time: Thu Sep 16 09:42:24 1993
                 Ending time: Thu Sep 16 09:50:19 1993

% rm NamedPipe
% 
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TEST DESCRIPTION:  This test performs a loopback test between two serial
lines.  Debug was enabled to display additional test information, which is
useful if serial line testing hangs. 'dt' does not use a watchdog timer.

Also notice the number of bytes allocated was 68, not 64 as 'bs='
indicates.  Pad bytes are allocated at the end of data buffers and
checked after reads to ensure drivers/file system code do not write
too many bytes (this has uncovered DMA FIFO flush problems in device
drivers in the past).

% dt if=/dev/tty00 of=/dev/tty01 bs=64 limit=100k flow=xon_xoff parity=none speed=38400 enable=debug
dt: Attempting to open input file '/dev/tty00', mode = 00...
dt: Input file '/dev/tty00' successfully opened, fd = 3
dt: Saving current terminal characteristics, fd = 3...
dt: Setting up test terminal characteristics, fd = 3...
dt: Attempting to open output file '/dev/tty01', mode = 01...
dt: Output file '/dev/tty01' successfully opened, fd = 4
dt: Saving current terminal characteristics, fd = 4...
dt: Setting up test terminal characteristics, fd = 4...
dt: Parent PID = 1809, Child PID = 1810
dt: Allocated buffer at address 0x4a000 of 68 bytes, using offset 0
dt: Allocated buffer at address 0x4a000 of 68 bytes, using offset 0
dt: Characters remaining in output queue = 304
dt: Waiting for output queue to drain...
dt: Output queue finished draining...
Total Statistics:
     Output device/file name: /dev/tty01 (device type=terminal)
    Terminal characteristics: flow=xon_xoff, parity=none, speed=38400
        Data pattern written: 0x39c39c39 (read verify disabled)
     Total records processed: 1600 @ 64 bytes/record (0.063 Kbytes)
     Total bytes transferred: 102400 (100.000 Kbytes, 0.098 Mbytes)
      Average transfer rates: 3840 bytes/sec, 3.750 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m26.66s
           Total system time: 00m00.06s
             Total user time: 00m00.01s
               Starting time: Wed Sep 15 11:37:39 1993
                 Ending time: Wed Sep 15 11:38:07 1993

Total Statistics:
      Input device/file name: /dev/tty00 (device type=terminal)
    Terminal characteristics: flow=xon_xoff, parity=none, speed=38400
           Data pattern read: 0x39c39c39
     Total records processed: 1600 @ 64 bytes/record (0.063 Kbytes)
     Total bytes transferred: 102400 (100.000 Kbytes, 0.098 Mbytes)
      Average transfer rates: 3703 bytes/sec, 3.617 Kbytes/sec
      Total passes completed: 1/1
       Total errors detected: 0/1
          Total elapsed time: 00m27.65s
           Total system time: 00m00.28s
             Total user time: 00m00.05s
               Starting time: Wed Sep 15 11:37:39 1993
                 Ending time: Wed Sep 15 11:38:07 1993

dt: Restoring saved terminal characteristics, fd = 3...
dt: Closing file '/dev/tty00', fd = 3...
dt: Waiting for child PID 1810 to exit...
dt: Child PID 1810, exited with status = 0
dt: Restoring saved terminal characteristics, fd = 4...
dt: Closing file '/dev/tty01', fd = 4...
% 
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TEST DESCRIPTION:  This test does write/reads testing to a raw device
starting 2 processes each of which will execute 2 passes.  Notice a
different pattern gets used for each pass.  There are 12 different
patterns built into the program which get cycled through which get cycled
through when multiple passes are performed.

% dt of=/dev/rrz11a bs=64k limit=5m procs=2 passes=2
Write Statistics (1797):
        Data pattern written: 0x39c39c39
     Total records processed: 80 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 5242880 (5120.000 Kbytes, 5.000 Mbytes)
      Average transfer rates: 598047 bytes/sec, 584.030 Kbytes/sec
      Total passes completed: 0/2
       Total errors detected: 0/1
          Total elapsed time: 00m08.76s
           Total system time: 00m00.05s
             Total user time: 00m00.65s

Write Statistics (1796):
        Data pattern written: 0x39c39c39
     Total records processed: 80 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 5242880 (5120.000 Kbytes, 5.000 Mbytes)
      Average transfer rates: 600330 bytes/sec, 586.260 Kbytes/sec
      Total passes completed: 0/2
       Total errors detected: 0/1
          Total elapsed time: 00m08.73s
           Total system time: 00m00.05s
             Total user time: 00m00.66s

Read Statistics (1797):
           Data pattern read: 0x39c39c39
     Total records processed: 80 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 5242880 (5120.000 Kbytes, 5.000 Mbytes)
      Average transfer rates: 534079 bytes/sec, 521.562 Kbytes/sec
      Total passes completed: 1/2
       Total errors detected: 0/1
          Total elapsed time: 00m09.81s
           Total system time: 00m00.06s
             Total user time: 00m01.38s

Read Statistics (1796):
           Data pattern read: 0x39c39c39
     Total records processed: 80 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 5242880 (5120.000 Kbytes, 5.000 Mbytes)
      Average transfer rates: 534988 bytes/sec, 522.449 Kbytes/sec
      Total passes completed: 1/2
       Total errors detected: 0/1
          Total elapsed time: 00m09.80s
           Total system time: 00m00.05s
             Total user time: 00m01.40s
	.
	.
	.
Total Statistics (1797):
     Output device/file name: /dev/rrz11a (Device: RZ56, type=disk)
   Data pattern read/written: 0x00ff00ff
     Total records processed: 320 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 20971520 (20480.000 Kbytes, 20.000 Mbytes)
      Average transfer rates: 562239 bytes/sec, 549.062 Kbytes/sec
      Total passes completed: 2/2
       Total errors detected: 0/1
          Total elapsed time: 00m37.30s
           Total system time: 00m00.23s
             Total user time: 00m04.10s
               Starting time: Wed Sep 15 11:32:45 1993
                 Ending time: Wed Sep 15 11:33:22 1993

Total Statistics (1796):
     Output device/file name: /dev/rrz11a (Device: RZ56, type=disk)
   Data pattern read/written: 0x00ff00ff
     Total records processed: 320 @ 65536 bytes/record (64.000 Kbytes)
     Total bytes transferred: 20971520 (20480.000 Kbytes, 20.000 Mbytes)
      Average transfer rates: 562490 bytes/sec, 549.307 Kbytes/sec
      Total passes completed: 2/2
       Total errors detected: 0/1
          Total elapsed time: 00m37.28s
           Total system time: 00m00.25s
             Total user time: 00m04.13s
               Starting time: Wed Sep 15 11:32:45 1993
                 Ending time: Wed Sep 15 11:33:22 1993

% 
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TEST DESCRIPTION:  This test attempts to write to a DEC OSF/1 raw disk
which contains a valid label block, and the action necessary to destroy
this label block before writes are possible.  As you can see, the first
disk block (block 0) is write protected (all other blocks are not however).
Since many people, including myself, have been burned (mis-lead) by this
wonderful feature, I thought it was worth documenting here.

# file /dev/rrz11c
/dev/rrz11c:	character special (8/19458) SCSI #1 RZ56 disk #88 (SCSI ID #3) 
# disklabel -r -w /dev/rrz11c rz56
# ls -ls /dev/rrz11a
0 crw-rw-rw-   1 root     system     8,19456 Sep 15 11:33 /dev/rrz11a
# dt of=/dev/rrz11c bs=64k limit=1m disable=stats
dt: 'write' - Read-only file system
dt: Error number 1 occurred on Thu Sep 16 10:53:54 1993
# dt of=/dev/rrz11a position=1b bs=64k limit=1m disable=stats
# disklabel -z /dev/rrz11c
# dt of=/dev/rrz11c bs=64k limit=1m disable=stats
#
------------------------------------------------------------------------------

TEST DESCRIPTION:  This test shows a real life problem discovered on a
DEC 3000-500 (Flamingo) system using DEC OSF/1 V1.3.  This test uncovers
a data corruption problem that occurs at the end of data buffers on read
requests.  The problem results from the FIFO being improperly flushed when
DMA transfers abort on certain boundaries (residual bytes left in FIFO).
This failure is uncovered by performing large reads of short records and
verifying the pad bytes, allocated at the end of data buffers, do *not*
get inadvertantly overwritten.  This example also illustrates the format
of dumped data buffers (when enabled via the "enable=dump" option).

% dt of=/dev/rmt0h min=1k max=25k incr=p-1 limit=1m disable=stats,verify
% dt if=/dev/rmt0h min=1k+25 max=25k incr=p-1 limit=1m disable=stats
dt: WARNING: Record #1, attempted to read 1049 bytes, read only 1024 bytes.
dt: WARNING: Record #2, attempted to read 9240 bytes, read only 9215 bytes.
dt: Data compare error at pad byte 0 in record number 2
dt: Data expected = 0xc6, data found = 0xff
dt: Error number 1 occurred on Sat Sep 18 11:15:08 1993
% dt if=/dev/rmt0h min=1k+25 max=25k incr=p-1 limit=1m disable=stats enable=dump
dt: WARNING: Record #1, attempted to read 1049 bytes, read only 1024 bytes.
dt: WARNING: Record #2, attempted to read 9240 bytes, read only 9215 bytes.
dt: Data compare error at pad byte 0 in record number 2
dt: Data expected = 0xc6, data found = 0xff
dt: Data buffer pointer = 0x3e3ff, buffer offset = 9215

Dumping Buffer (base = 0x3c000, offset = 9215, size = 9219 bytes):

0x3e3df  39 39 9c c3 39 39 9c c3 39 39 9c c3 39 39 9c c3
0x3e3ef  39 39 9c c3 39 39 9c c3 39 39 9c c3 39 39 9c c3
0x3e3ff  ff c6 63 3c c6 c6 63 3c c6 c6 63 3c c6 c6 63 3c
0x3e40f  c6 c6 63 3c c6 c6 63 3c c6 c6 63 3c c6 c6 63 3c
dt: Error number 1 occurred on Sat Sep 18 11:15:31 1993
% echo $status
-1
%