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Groups > linux.debian.user > #267256
| From | David Christensen <dpchrist@holgerdanske.com> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: Unidentified subject! |
| Date | 2024-02-11 00:40 +0100 |
| Message-ID | <I656W-9jhs-11@gated-at.bofh.it> (permalink) |
| References | <I5Sjn-9bw1-3@gated-at.bofh.it> <I5SW6-9bXT-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2/10/24 02:38, Thomas Schmitt wrote: > I have an own weak-random generator, but shred beats it by a factor of 10 > when writing to /dev/null. As a baseline, here is a 2011 Dell Latitude E6520 with Debian generating a non-repeatable 1 GiB stream of cryptographically secure pseudo-random numbers: 2024-02-10 14:10:27 dpchrist@laalaa ~ $ lscpu | grep 'Model name' Model name: Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz 2024-02-10 14:01:25 dpchrist@laalaa ~ $ cat /etc/debian_version ; uname -a 11.8 Linux laalaa 5.10.0-27-amd64 #1 SMP Debian 5.10.205-2 (2023-12-31) x86_64 GNU/Linux 2024-02-10 14:01:47 dpchrist@laalaa ~ $ bash --version | head -n 1 GNU bash, version 5.1.4(1)-release (x86_64-pc-linux-gnu) 2024-02-10 14:13:08 dpchrist@laalaa ~ $ time dd if=/dev/urandom bs=8K count=128K | wc -c 1073741824 131072+0 records in 131072+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.30652 s, 249 MB/s real 0m4.311s user 0m0.107s sys 0m4.695s If the OP has a known good storage device of equal or larger size than the UUT(s), I suggest using /dev/urandom and tee(1) to write the same CSPRN stream to all of the devices and using cmp(1) to validate. I use Perl. When I needed a CSPRNG, I searched and found: https://metacpan.org/pod/Math::Random::ISAAC::XS Using Perl and Math::Random::ISAAC::XS to generate a repeatable stream of cryptographically secure pseudo-random numbers: 2024-02-10 14:09:12 dpchrist@laalaa ~ $ perl -v | head -n 2 | grep . This is perl 5, version 32, subversion 1 (v5.32.1) built for x86_64-linux-gnu-thread-multi 2024-02-10 14:09:53 dpchrist@laalaa ~ $ perl -MMath::Random::ISAAC::XS -e 'print $Math::Random::ISAAC::XS::VERSION, $/' 1.004 2024-02-10 14:10:32 dpchrist@laalaa ~ $ time perl -MMath::Random::ISAAC::XS -e '$i=Math::Random::ISAAC::XS->new(12345678); print pack 'L',$i->irand while 1' | dd bs=8K count=128K | wc -c 1073741824 131072+0 records in 131072+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 82.6523 s, 13.0 MB/s real 1m22.657s user 1m22.892s sys 0m5.810s The 'perl ... | dd ...' pipeline appears to be limited to a block size of 8,192 bytes. I do not know if this is due to bash(1), perl(1), or dd(1) (?). The repeatability of the ISAAC stream would substitute for the known good storage device, but the throughput is ~19x slower than /dev/urandom. A drive capacity validation tool would want to feature concurrent threads and I/O on SMP machines. David
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Unidentified subject! gene heskett <gheskett@shentel.net> - 2024-02-07 21:40 +0100
Re: Unidentified subject! Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-08 05:30 +0100
Re: Unidentified subject! gene heskett <gheskett@shentel.net> - 2024-02-10 11:00 +0100
Re: Unidentified subject! "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-10 11:40 +0100
shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-10 13:50 +0100
Re: shred bug? [was: Unidentified subject!] tomas@tuxteam.de - 2024-02-10 14:00 +0100
Re: shred bug? "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-10 15:00 +0100
Re: shred bug? <tomas@tuxteam.de> - 2024-02-10 15:40 +0100
Re: shred bug? Gremlin <scott-andrews@columbus.rr.com> - 2024-02-10 14:40 +0100
Re: shred bug? "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-10 14:40 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 01:10 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-11 01:20 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 01:30 +0100
Re: shred bug? [was: Unidentified subject!] debian-user@howorth.org.uk - 2024-02-11 14:00 +0100
Re: shred bug? "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 14:30 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-11 08:10 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-11 15:40 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-11 15:50 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-11 16:00 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-11 16:00 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-12 18:00 +0100
Re: shred bug? [was: Unidentified subject!] Curt <curty@free.fr> - 2024-02-12 18:00 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-12 22:00 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-12 22:10 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-13 06:50 +0100
Re: shred bug? [was: Unidentified subject!] David Wright <deblis@lionunicorn.co.uk> - 2024-02-11 16:30 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-13 13:20 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-13 13:40 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-13 13:50 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-13 14:00 +0100
Re: shred bug? [was: Unidentified subject!] David Wright <deblis@lionunicorn.co.uk> - 2024-02-13 16:40 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-13 17:30 +0100
Re: shred bug? [was: Unidentified subject!] debian-user@howorth.org.uk - 2024-02-13 18:50 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-13 22:10 +0100
Re: shred bug? [was: Unidentified subject!] <tomas@tuxteam.de> - 2024-02-14 06:50 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-13 19:00 +0100
Re: shred bug? [was: Unidentified subject!] Greg Wooledge <greg@wooledge.org> - 2024-02-13 20:00 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-13 20:40 +0100
Re: shred bug? [was: Unidentified subject!] gene heskett <gheskett@shentel.net> - 2024-02-13 20:40 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-13 20:50 +0100
Re: shred bug? [was: Unidentified subject!] gene heskett <gheskett@shentel.net> - 2024-02-13 21:30 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-13 22:10 +0100
Re: shred bug? [was: Unidentified subject!] gene heskett <gheskett@shentel.net> - 2024-02-13 22:50 +0100
Re: shred bug? [was: Unidentified subject!] David Wright <deblis@lionunicorn.co.uk> - 2024-02-15 06:40 +0100
Re: shred bug? [was: Unidentified subject!] David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 23:50 +0100
Re: shred bug? [was: Unidentified subject!] Max Nikulin <manikulin@gmail.com> - 2024-02-13 03:40 +0100
Re: shred bug? [was: Unidentified subject!] "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 16:30 +0100
Re: shred bug? [was: Unidentified subject!] Michael Stone <mstone@debian.org> - 2024-02-16 16:00 +0100
Re: Unidentified subject! gene heskett <gheskett@shentel.net> - 2024-02-10 18:50 +0100
Re: Unidentified subject! "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-10 19:40 +0100
Re: Unidentified subject! gene heskett <gheskett@shentel.net> - 2024-02-10 20:30 +0100
Re: Unidentified subject! David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 00:50 +0100
Re: Unidentified subject! "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 09:10 +0100
Re: Unidentified subject! David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 21:50 +0100
Re: Unidentified subject! David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 00:40 +0100
Re: Unidentified subject! "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 09:20 +0100
Re: Unidentified subject! David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 11:10 +0100
Fast Random Data Generation (Was: Re: Unidentified subject!) Linux-Fan <Ma_Sys.ma@web.de> - 2024-02-11 11:30 +0100
Re: Fast Random Data Generation "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 12:30 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-11 13:20 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) David Christensen <dpchrist@holgerdanske.com> - 2024-02-12 07:20 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) Linux-Fan <Ma_Sys.ma@web.de> - 2024-02-12 17:40 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) David Christensen <dpchrist@holgerdanske.com> - 2024-02-12 22:30 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) Linux-Fan <Ma_Sys.ma@web.de> - 2024-02-13 18:40 +0100
Re: Fast Random Data Generation (Was: Re: Unidentified subject!) Jeffrey Walton <noloader@gmail.com> - 2024-02-12 22:30 +0100
Re: Unidentified subject! "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-11 12:20 +0100
Re: Unidentified subject! Jeffrey Walton <noloader@gmail.com> - 2024-02-11 16:20 +0100
Re: Unidentified subject! David Christensen <dpchrist@holgerdanske.com> - 2024-02-11 23:00 +0100
Re: Unidentified subject! Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-10 15:40 +0100
Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 16:40 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-08 17:20 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 17:30 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (WasRe: Unidentified subject!) gene heskett <gheskett@shentel.net> - 2024-02-09 09:50 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Ralph Aichinger <ra@h5.or.at> - 2024-02-08 18:00 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Jeffrey Walton <noloader@gmail.com> - 2024-02-08 20:30 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 21:50 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 21:50 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-08 22:00 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 22:20 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 22:30 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-08 23:10 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-08 22:30 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (WasRe: Unidentified subject!) gene heskett <gheskett@shentel.net> - 2024-02-09 14:00 +0100
Re: Things I don't touch with a 3.048m barge pole "Thomas Schmitt" <scdbackup@gmx.net> - 2024-02-09 14:50 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (WasRe: Unidentified subject!) David Christensen <dpchrist@holgerdanske.com> - 2024-02-10 07:00 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage(WasRe: Unidentified subject!) gene heskett <gheskett@shentel.net> - 2024-02-10 18:40 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 21:40 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Arno Lehmann <al@its-lehmann.de> - 2024-02-09 09:50 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Max Nikulin <manikulin@gmail.com> - 2024-02-08 18:30 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 21:40 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Gremlin <scott-andrews@columbus.rr.com> - 2024-02-08 22:10 +0100
Re: Things I don't touch with a 3.048m barge pole: USB storage (Was Re: Unidentified subject!) Andy Smith <andy@strugglers.net> - 2024-02-08 22:20 +0100
Re: Unidentified subject! Richmond <dnomhcir@gmx.com> - 2024-02-08 23:50 +0100
Re: Unidentified subject! Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-09 00:10 +0100
Re: Unidentified subject! Charles Curley <charlescurley@charlescurley.com> - 2024-02-09 00:50 +0100
Re: Unidentified subject! Richmond <dnomhcir@gmx.com> - 2024-02-09 05:50 +0100
Re: Unidentified flying subject! Charles Curley <charlescurley@charlescurley.com> - 2024-02-09 07:50 +0100
Re: Unidentified flying subject! Richmond <dnomhcir@gmx.com> - 2024-02-09 14:20 +0100
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