TUHS August 2016

tuhs@tuhs.org

20 participants
14 discussions

by Warren Toomey

Hi all, I'm working on a Unix-related project, and I thought I'd ask if anybody here might help. There's a pared-down Unix-like system, xv6, which is inspired by 6th Edition Unix and the Lions Commentary. Its purpose is to teach OS principles. The website and book are here: https://pdos.csail.mit.edu/6.828/2014/xv6.html https://pdos.csail.mit.edu/6.828/2014/xv6/book-rev8.pdf Unfortunately, while the kernel is nice, they don't provide much of a run-time environment, so it feels too much of a toy to use. I had the idea of porting a small set of libraries and commands over to get it to the point where it feels a bit like 7th Edition. I've made a start by using the Minix 2.0 libraries and commands, see https://github.com/DoctorWkt/xv6-minix2 and the NOTES file. I now realise that bringing up a libc plus associated commands will involve a fair bit of work. So, if anybody is interested in helping, let me know. Thanks in advance, Warren

7 years, 8 months

Re: [TUHS] History repeating itself (was: Unix v6 problem with /tmp)

by Norman Wilson

Dave Horsfall: Not Henry Spencer, perchance? ===== Since the Canadian in question had been working in the US since 1964 or so, he must by now be pushing 70 years old. I haven't seen Henry for some years, but I don't think he has aged that much. Norman Wilson Toronto ON

7 years, 8 months

Re: [TUHS] History repeating itself (was: Unix v6 problem with /tmp)

by Rudi Blom

> Date: Sat, 30 Jul 2016 15:30:36 +0000 > From: Michael Kjörling <michael(a)kjorling.se> > To: tuhs(a)tuhs.org > Subject: Re: [TUHS] History repeating itself > Message-ID: <20160730153036.GI3375(a)yeono.kjorling.se> > Content-Type: text/plain; charset=utf-8 > > On 30 Jul 2016 10:15 -0400, from cowan(a)mercury.ccil.org (John Cowan): >>> Who needs FedEx? >> >> Well, latency counts for something too, as does radius: if I want to >> send bulk data from New York to London (a very normal thing to do), >> your station wagon isn't going to count for much. > > You could, however, get an economy class flight ticket and load up > your suitcase with either HDDs or SDXCs (I suspect SDXCs would be > better per amount of data from the perspective of both volume and > weight, and would take better to handling). Given FedEx's prices, > _once you have the infrastructure set up_ (which you'll need whether > you have someone travel with the media, by air or by stationwagon, or > FedEx it), that _might_ even compare favorably in terms of bytes > transferred per second per dollar. (Now that's a measurement of > throughput I don't think I've seen before; B/s/$.) Of course, you'd > need someone who can babysit the suitcase, which potentially adds to > the cost, but the stationwagon traditionally hasn't been self-driving > either, and most of a transatlantic flight isn't active time on part > of the person travelling with the suitcase so you could go with an > overnight flight and allow the person to sleep. > > If you want to reduce the risk of the bag getting handled roughly or > lost in handling, reduce the above to carry-on luggage; it will still > provide a quite respectable throughput. > > ... ... > > It might not be the absolute cheapest approach, but it seems rather > hard to beat in terms of throughput per dollar for bulk data transfer, > especially if you already have someone who would travel anyway and can > be convinced to take a company-approved suitcase in return for having > their ticket paid for. > > -- > Michael Kjörling • https://michael.kjorling.se • michael(a)kjorling.se > “People who think they know everything really annoy > those of us who know we don’t.” (Bjarne Stroustrup) > To setup the 'infrastructure might be the tricky part. Many years ago I flew from Montreal to Amsterdam and had two stacks of 5-1/4" diskettes with me. No papers, confiscated in Amsterdam. Cheers, Rudi

7 years, 8 months

Unix v6 problem with /tmp

by Mark Longridge

Hi folks, My root partition for Unix v6 is almost full and /dev/rk0 only has 83 blocks. The trouble is I wanted to compile bc.y and I think it needs around 300 blocks of temporary space. I was wondering if there was a way to set up Unix v6 so that it could use one of the other drives for tmp space. I tried to set up a link using ln but it seems I can't link across filesystems. The exact error is "26: Intermediate file error". I managed to rearrange things so that /dev/rk0 had over 300 blocks of free space and it fixed the problem, but I'm curious if there was another solution. Mark

7 years, 8 months

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TUHS August 2016