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<HTML><HEAD><TITLE>Data Test Program (dt) January 28th, 1998</TITLE></HEAD><BODY BGCOLOR="#D19275"><CENTER><H2><STRONG>What's New as of January 28th, 1998</STRONG></H2></CENTER><H2>Changes For This Release</H2>The following changes have been made to <I>dt</I> Version 10.12:<UL><LI>Add dtaio_close() function, to wait for queued I/O's when we'reaborting, to avoid kernel I/O AIO rundown problem, which panic'sthe system if we close the CAM disk driver device descriptor,prior to AIO's completing (fixed in steelos by Anton Verhulst).[ Refernce QAR Number 57040 for more information. ]<BLOCKQUOTE>NOTE: This problem is very prevalent when doing "cable pulls"or otherwise forcing CAM disk I/O's into error recoveryand then aborting running 'dt's. This I/O waiting onlyoccurs once, as a 2nd signal (i.e. "kill" or <Ctrl/C>simply exits the program. Beware of "kill -9" :-)</BLOCKQUOTE><LI>Don't initialize data buffer being written for "disable=compare"which yields better performance. Also correct a problem referencingmemory map (mmap) data due to compiler optimization (reference_data()use static volatile). [ Changes requested by Marcus Barrow, thanks! ]</UL><HR><A HREF="mailto:Robin.Miller@compaq.com"><IMG SRC="../gifs/mailbox.gif" ALT="Mail"></A>Send mail to admin of this page: <EM>Robin.Miller@compaq.com</EM> <A HREF="../index.html"><IMG SRC="../gifs/home04.gif" ALT="Home"></A>To Robin's home page.<P>Last modified: December 8th, 1999<HR><H2>Examples:</H2><HR SIZE=5 NOSHADE><PRE>im2fast% <B>dt if=/dev/rrz0c iotype=random disable=compare runtime=3m enable=debug aios=250</B>dt: Attempting to open input file '/dev/rrz0c', mode = 00...dt: Input file '/dev/rrz0c' successfully opened, fd = 9dt: Data limit set to 1050040320 bytes, 2050860 blocks...dt: Allocated buffer at address 0x14002e000 of 516 bytes, using offset 0dt: Allocated buffer at address 0x140030000 of 516 bytes, using offset 0dt: Allocated buffer at address 0x140034000 of 516 bytes, using offset 0 . . . [ <Ctrl/C> entered here to abort test... ]Total Statistics: Input device/file name: /dev/rrz0c (Device: RZ26B, type=disk) Data pattern read: 0x39c39c39 (data compare disabled) Total records processed: 1080 @ 512 bytes/record (0.500 Kbytes) Total bytes transferred: 552960 (540.000 Kbytes, 0.527 Mbytes) Average transfer rates: 35829 bytes/sec, 34.989 Kbytes/sec Number I/O's per second: 69.978 Total passes completed: 0 Total errors detected: 0/1 Total elapsed time: 00m15.43s Total system time: 00m00.08s Total user time: 00m00.01s Starting time: Wed Jan 28 10:17:32 1998 Ending time: Wed Jan 28 10:17:48 1998dt: All requests completed before cancel...dt: Closing file '/dev/rrz0c', fd = 9...im2fast% </PRE></BODY></HTML>⌨️ 快捷键说明
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