Re: test usb drive read / write speed
On Sun, Apr 24, 2011 at 1:14 PM, Ron Johnson ron.l.john...@cox.net wrote: On 04/23/2011 11:09 PM, Huang, Tao wrote: [snip] is there a utility that: 1. benchmarks random access, 2. can do random writing on unused spaces for major filesystems, 3. deals with the buffer properly. bonnie++ thanks. that's a convenient tool. however, it keeps producing: $ bonnie -d /media/tmp/ Writing a byte at a time...done Writing intelligently...Can't write block.: No such file or directory Can't write block 478518. $ bonnie -d /media/tmp/ Writing a byte at a time...done Writing intelligently...Can't write block.: No space left on device Can't write block 474393. i checked the default parameters. nothing seems wrong. i was benchmarking a kingston 4GB microSD card, connected with a usb adapter. any help will be appreciated. Tao -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/BANLkTinVXsU6OyxYRJm4N+nCeB1f=la...@mail.gmail.com
Re: test usb drive read / write speed
On Sun, 24 Apr 2011 12:09:00 +0800, Huang, Tao wrote: i was trying to find out among several microSD cards which one has the fastest speed. i searched the web and didn't see any efficient solutions. are there conventional ways to test usb drive read / write speed? or any block device? (...) You may find useful this link: http://grigio.org/microsd_class_6_performance_benchmarks It seems to be using palimtest, a nice GUI tool included within the GNOME desktop. Just a careful note here, write speed test needs the device to be completely empty (with no data nor partitions). Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2011.04.24.13.44...@gmail.com
Re: test usb drive read / write speed
On Sun, Apr 24, 2011 at 1:14 PM, Ron Johnson ron.l.john...@cox.net wrote: On 04/23/2011 11:09 PM, Huang, Tao wrote: [snip] is there a utility that: 1. benchmarks random access, 2. can do random writing on unused spaces for major filesystems, 3. deals with the buffer properly. bonnie++ bonnie++ doesn't seem small-device-friendly. $ bonnie -d /path/to/test/ -s 1024 File size should be double RAM for good results, RAM is 3012M so effectively i cant run it on any device whose size is smaller than 6G on my box. is it what it means? thanx Tao -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/BANLkTimGaZsO3gg7hsw4MxK4kWWeZM3Z=q...@mail.gmail.com
Re: test usb drive read / write speed
On Sun, Apr 24, 2011 at 9:44 PM, Camaleón noela...@gmail.com wrote: [...] You may find useful this link: http://grigio.org/microsd_class_6_performance_benchmarks It seems to be using palimtest, a nice GUI tool included within the GNOME desktop. Just a careful note here, write speed test needs the device to be completely empty (with no data nor partitions). thanks. it's totally accecptable to wipe a SD card. the palimpsest in this article is in the debian gnome-disk-utility package. search it with google, i also find this article useful: https://wiki.archlinux.org/index.php/SSD_Benchmarking i don't think echo 3 /proc/sys/vm/drop_caches is a good idea. mounting a fs with the flag sync disables it's buffers, doesn't it? if dealing with raw device is the case. one can always use $ dd if=infile of=/dev/raw_block_device seek=offset to write to any part of that device. i'll run palimpsest on my cards tomorrow to see if it's results cover everything i want. Cheers, Tao -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/banlktin7mr1c0vmgzsxh1mer0xzbmeu...@mail.gmail.com
Re: test usb drive read / write speed
On 04/24/2011 09:44 AM, Camaleón wrote: On Sun, 24 Apr 2011 12:09:00 +0800, Huang, Tao wrote: i was trying to find out among several microSD cards which one has the fastest speed. i searched the web and didn't see any efficient solutions. are there conventional ways to test usb drive read / write speed? or any block device? (...) You may find useful this link: http://grigio.org/microsd_class_6_performance_benchmarks It seems to be using palimtest, a nice GUI tool included within the GNOME desktop. Just a careful note here, write speed test needs the device to be completely empty (with no data nor partitions). Greetings, Do you mean palimpsest or is that something else? --doug -- Blessed are the peacekeepers...for they shall be shot at from both sides. --A. M. Greeley -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4db464e3.5050...@optonline.net
Re: test usb drive read / write speed
On Sun, 24 Apr 2011 13:58:59 -0400, Doug wrote: On 04/24/2011 09:44 AM, Camaleón wrote: (...) It seems to be using palimtest, a nice GUI tool included within the GNOME desktop. Just a careful note here, write speed test needs the device to be completely empty (with no data nor partitions). Do you mean palimpsest or is that something else? Yep, that's it, I misspelled the name of the tool :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2011.04.24.18.27...@gmail.com
test usb drive read / write speed
hi list,
i was trying to find out among several microSD cards which one has the
fastest speed.
i searched the web and didn't see any efficient solutions.
are there conventional ways to test usb drive read / write speed? or
any block device?
i'm currently using hdparm for reading speed test.
$ hdparm --offset N -t /path/to/device
for writing speed,
$ time { dd if=/dev/zero of=/file/on/device bs=1M count=100; sync; }
$ time { cp /tmp/100m.urandom /file/on/device; sync; }
the 100m.urandom file is created before the test, since reading from
/dev/urandom is usually slower than writing to the device.
and my /tmp is mounted as tmpfs.
i wrote a script to run hdparm for multiple times on different
offsets. this is not random access but the results are satisfactory.
but i have no idea how to simulate a random writing access with data
on the drive untouched.
is there a utility that:
1. benchmarks random access,
2. can do random writing on unused spaces for major filesystems,
3. deals with the buffer properly.
Cheers,
Tao
--
School of Mathematical Sciences
Peking University
http://huangtao.me/
http://www.google.com/profiles/UniIsland
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Re: test usb drive read / write speed
On 04/23/2011 11:09 PM, Huang, Tao wrote:
hi list,
i was trying to find out among several microSD cards which one has the
fastest speed.
i searched the web and didn't see any efficient solutions.
are there conventional ways to test usb drive read / write speed? or
any block device?
i'm currently using hdparm for reading speed test.
$ hdparm --offset N -t /path/to/device
for writing speed,
$ time { dd if=/dev/zero of=/file/on/device bs=1M count=100; sync; }
$ time { cp /tmp/100m.urandom /file/on/device; sync; }
the 100m.urandom file is created before the test, since reading from
/dev/urandom is usually slower than writing to the device.
and my /tmp is mounted as tmpfs.
i wrote a script to run hdparm for multiple times on different
offsets. this is not random access but the results are satisfactory.
but i have no idea how to simulate a random writing access with data
on the drive untouched.
is there a utility that:
1. benchmarks random access,
2. can do random writing on unused spaces for major filesystems,
3. deals with the buffer properly.
bonnie++
--
Neither the wisest constitution nor the wisest laws will secure
the liberty and happiness of a people whose manners are universally
corrupt.
Samuel Adams, essay in The Public Advertiser, 1749
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