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<HTML><HEAD><TITLE>Data Test Program (dt) March 30, 1996</TITLE></HEAD><BODY BGCOLOR="#E9C2A6"><CENTER><H2><STRONG>What's New as of May 14, 1997</STRONG></H2></CENTER><H2>Changes For This Release</H2>The following changes have been made to 'dt' Version 10.8:<UL><LI>Ali Eghlima added a "munsa={cr,pr,cw,pw,ex}" options whichuses DLM for MUNSA testing. Here's the 'dt' help text:<P><PRE>MUNSA Lock Options: cr = Concurrent Read (permits read access, cr/pr/cw by others) pr = Protected Read (permits cr/pr read access to all, no write) cw = Concurrent Write (permits write and cr access to resource by all) pw = Protected Write (permits write access, cr by others) ex = Exclusive Mode (permits read/write access, no access to others) For more details, please refer to the dlm(4) reference page.</PRE><P><LI>If a "skip=" count is specified with an output file "of=",open the file for R/W access since skips are accompished viaread()'s of record size.<BR>[ Per Olov Wahlstrom reported this problem. ]<P><LI>If a copy or verify operation is selected, and a data limitis specified, then double the data limit to account for doublethe I/O's. Previously, only half of the desired data limit wascopied and/or verified.<P><LI>Check status from closing file descriptor, and if it's notSUCCESS, use this for the exit status. For tapes, deferredwrites and failure to write file marks occur at close time.<BR>[ Roger Richardson reported this problem. ]<P><LI>If we encounter a ENOSPC error and no data has been transferred,flag this as an error. This normally indicates a zero lengthpartition or the user may have seek'ed past eom or eop.<BR>[ George Bittner reported this problem. ]<P><LI>Removed use of undocumented AIO_SEEK_CUR in aio_offset.Also fixed bug where random I/O offset was clobbered, thusresulting in sequential I/O.<BR>[ Jeff Denham reported this problem. ]<P><LI>Report number of I/O's per second (some people desire this).</UL><P>The latest version of <I>dt</I> is available on our production machinesin the following account:<P><CENTER><B>Location:</B> <I>wasted:~rmiller/dt.d/{dt-ptos,dt-dlm,dt-V3.2}</I></CENTER><CENTER>or via</CENTER><CENTER><A HREF="../dt.html"><B>URL:</B> <I>http://www.zk3.dec.com/~rmiller/dt.html</I></A></CENTER><HR><A HREF="mailto:rmiller@zk3.dec.com"><IMG SRC="../gifs/mailbox.gif" ALT="Mail"></A>Send mail to admin of this page: <EM>rmiller@zk3.dec.com</EM> <A HREF="../index.html"><IMG SRC="../gifs/home04.gif" ALT="Home"></A>To Robin's home page.<P>Last modified: May 14, 1997<HR><H2>Examples:</H2><HR SIZE=5 NOSHADE><PRE> [ This example shows the new handling of ENOSPC error code. ]% <B>dt of=/dev/rrz2b position=393216b records=1 disable=verify</B>dt: 'write' - No space left on devicedt: Error number 1 occurred on Wed May 14 14:27:45 1997Total Statistics: Output device/file name: /dev/rrz2b (Device: RZ25, type=disk) Data pattern written: 0x39c39c39 (read verify disabled) Total records processed: 0 @ 512 bytes/record (0.500 Kbytes) Total bytes transferred: 0 (0.000 Kbytes, 0.000 Mbytes) Average transfer rates: 0 bytes/sec, 0.000 Kbytes/sec Number I/O's per second: 0.000 Total passes completed: 1/1 Total errors detected: 1/1 Total elapsed time: 00m00.03s Total system time: 00m00.01s Total user time: 00m00.00s Starting time: Wed May 14 14:27:45 1997 Ending time: Wed May 14 14:27:45 1997% <B>echo $status</B>-1% <HR NOSHADE> [ This example shows the "Number I/O's per second" addition. ]im2fast% <B>dt of=/var/tmp/dt.data bs=8k limit=25m</B>Write Statistics: Total records processed: 3200 @ 8192 bytes/record (8.000 Kbytes) Total bytes transferred: 26214400 (25600.000 Kbytes, 25.000 Mbytes) Average transfer rates: 2021676 bytes/sec, 1974.293 Kbytes/sec Number I/O's per second: 246.787 Total passes completed: 0/1 Total errors detected: 0/1 Total elapsed time: 00m12.96s Total system time: 00m00.95s Total user time: 00m01.70sRead Statistics: Total records processed: 3200 @ 8192 bytes/record (8.000 Kbytes) Total bytes transferred: 26214400 (25600.000 Kbytes, 25.000 Mbytes) Average transfer rates: 4239526 bytes/sec, 4140.162 Kbytes/sec Number I/O's per second: 517.520 Total passes completed: 1/1 Total errors detected: 0/1 Total elapsed time: 00m06.18s Total system time: 00m00.61s Total user time: 00m05.50sTotal Statistics: Output device/file name: /var/tmp/dt.data Data pattern read/written: 0x39c39c39 Total records processed: 6400 @ 8192 bytes/record (8.000 Kbytes) Total bytes transferred: 52428800 (51200.000 Kbytes, 50.000 Mbytes) Average transfer rates: 2737796 bytes/sec, 2673.629 Kbytes/sec Number I/O's per second: 334.204 Total passes completed: 1/1 Total errors detected: 0/1 Total elapsed time: 00m19.15s Total system time: 00m01.56s Total user time: 00m07.20s Starting time: Wed May 14 15:45:18 1997 Ending time: Wed May 14 15:45:37 1997im2fast% </PRE></BODY></HTML>⌨️ 快捷键说明
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