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Disk access mode under Linux
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Disk access mode under Linux
by Velu Erwan
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Hey,
I'm using "iometer-2008-06-22-rc2.src.tgz". <http://www.mirrorservice.org/sites/download.sourceforge.net/pub/sourceforge/i/io/iometer/iometer-2008-06-22-rc2.src.tgz> Reading the changelog I can see the following : - Patch by Christensen ReedX K to use O_DIRECT as default for Linux Grepping the sources for the "open()" calls and grepping for O_DIRECT let me think that IOmeter doesn't use the O_DIRECT mode. Does IOmeter really use the O_DIRECT access mode under Linux ? Cheers, Erwan, ------------------------------------------------------------------------------ _______________________________________________ Iometer-user mailing list Iometer-user@... https://lists.sourceforge.net/lists/listinfo/iometer-user |
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Re: Disk access mode under Linux
by Ming Zhang-3
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we disable and enable this back and forth because of various problem
under linux with O_DIRECT... On Fri, Mar 27, 2009 at 8:50 AM, Erwan Velu <erwan@...> wrote: > Hey, > > I'm using "iometer-2008-06-22-rc2.src.tgz". > <http://www.mirrorservice.org/sites/download.sourceforge.net/pub/sourceforge/i/io/iometer/iometer-2008-06-22-rc2.src.tgz> > > Reading the changelog I can see the following : > - Patch by Christensen ReedX K to use O_DIRECT as default for Linux > > Grepping the sources for the "open()" calls and grepping for O_DIRECT > let me think that IOmeter doesn't use the O_DIRECT mode. > > Does IOmeter really use the O_DIRECT access mode under Linux ? > > Cheers, > Erwan, > > ------------------------------------------------------------------------------ > _______________________________________________ > Iometer-user mailing list > Iometer-user@... > https://lists.sourceforge.net/lists/listinfo/iometer-user > ------------------------------------------------------------------------------ _______________________________________________ Iometer-user mailing list Iometer-user@... https://lists.sourceforge.net/lists/listinfo/iometer-user |
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Changes for IOMETER 2006 to 2008 and impact for SSD's
by Mark_Lindholm
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Following is from the change list for IOMETER 2008:
Patch by Kris Murray and Allen Wayne from Intel on randomizing the written data. The previous implementation of writing 0's causes an un-desired side-effect on some media, especially flash-based devices. The writing of random data creates a realistic workload for these new devices. (Also data patten will have impact on protocol like iSCSI as well). I thought IOMETER always wrote random data. Can I get some more info on the change and what impact it has on SSD performance. Mark Lindholm Enterprise HDD Engineering 512 725 3195 mark_lindholm@... ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Iometer-user mailing list Iometer-user@... https://lists.sourceforge.net/lists/listinfo/iometer-user |
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Re: Changes for IOMETER 2006 to 2008 and impact for SSD's
by Mark_Lindholm
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I would really like to understand more about this change. I thought
IOMETER 2006 wrote pseudo-random data, is that true or not? Mark Lindholm Enterprise HDD Engineering 512 725 3195 mark_lindholm@... -----Original Message----- From: Lindholm, Mark Sent: Wednesday, August 19, 2009 5:04 PM To: iometer-user@... Subject: Changes for IOMETER 2006 to 2008 and impact for SSD's Following is from the change list for IOMETER 2008: Patch by Kris Murray and Allen Wayne from Intel on randomizing the written data. The previous implementation of writing 0's causes an un-desired side-effect on some media, especially flash-based devices. The writing of random data creates a realistic workload for these new devices. (Also data patten will have impact on protocol like iSCSI as well). I thought IOMETER always wrote random data. Can I get some more info on the change and what impact it has on SSD performance. Mark Lindholm Enterprise HDD Engineering 512 725 3195 mark_lindholm@... ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Iometer-user mailing list Iometer-user@... https://lists.sourceforge.net/lists/listinfo/iometer-user |
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