On 10/28/23 11:03 AM, Joerg Walther wrote:
> 56d.1152 wrote:
>
>> But, should I spend $$$ on a 4 when the 5s are
>> soon to hit the market ??? They're claiming
>> at least TWICE the performance (I guess at the
>> same power-consumption).
>
> Unfortunately, power consumption is much higher and you need a much
> stronger PSU. I'm not getting one since I do not need this kind of
> performance on a Pi.

They MAY be destroying their own 'niche'.

If 'PC' performance/power-consumption is
required I'll just buy a PC board.

I'll consider the 4 the pinnacle of Pi.
When they stop making them, I won't buy
any of their other stuff.

56d.1152 wrote:

> Joerg Walther wrote:
>
>> 56d.1152 wrote:
>>
>>> But, should I spend $$$ on a 4 when the 5s are soon to hit the
>>> market ??? They're claiming at least TWICE the performance (I
>>> guess at the same power-consumption).
>>
>> Unfortunately, power consumption is much higher and you need a
>> much stronger PSU. I'm not getting one since I do not need this
>> kind of performance on a Pi.
>
> They MAY be destroying their own 'niche'.

I think rPi4 jumped the shark in terms of cost and power ... moving from
the mindset of a handy SBC, to a small PC.

On 30/10/2023 05:51, 56d.1152 wrote:
> On 10/25/23 1:29 PM, The Natural Philosopher wrote:
>> On 25/10/2023 17:13, Theo wrote:
>>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>>> https://thepihut.com/products/raspberry-pi-4-model-b
>>>>
>>>> Coincidentally only a few miles away
>>>
>>> For the record, I understand that Pi5s can be bought over the counter
>>> at the
>>> Raspberry Pi store in Cambridge.  Limited to one per customer, but
>>> that rate
>>> limit may mean they can maintain stock.
>>>
>>> (yes I know you might be allergic to Cambridge :-)
>>>
>> By the time I have driven in or paid the park and ride fare, and
>> wasted a whole day, the cost of ordering online even if I have to wait
>> a few days is far far less in time, money, and sheer waste of life
>> that Cambridge represents these days.
>
>   Might do better with *walking* ......
>
All 25 miles?

>   Or just giving Cambridge the shaft entirely ...
>

Mostly, I do.

>   Sorry. but 'Woke' really should = BROKE.

Cambridge now lives in a bubble of progressive liberal ideologies that
are strangling it commercially: Everyone I know who doesn't tolerate
that shit, leaves.

--
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
time as the State can shield the people from the political, economic
and/or military consequences of the lie. It thus becomes vitally
important for the State to use all of its powers to repress dissent, for
the truth is the mortal enemy of the lie, and thus by extension, the
truth is the greatest enemy of the State.

Joseph Goebbels

On 30/10/2023 06:06, 56d.1152 wrote:
> On 10/28/23 11:03 AM, Joerg Walther wrote:
>> 56d.1152 wrote:
>>
>>> But, should I spend $$$ on a 4 when the 5s are
>>>    soon to hit the market ??? They're claiming
>>>    at least TWICE the performance (I guess at the
>>>    same power-consumption).
>>
>> Unfortunately, power consumption is much higher and you need a much
>> stronger PSU. I'm not getting one since I do not need this kind of
>> performance on a Pi.
>
>   They MAY be destroying their own 'niche'.
>
>   If 'PC' performance/power-consumption is
>   required I'll just buy a PC board.

That shortly may feature an ARM processor, anyway.

>
>   I'll consider the 4 the pinnacle of Pi.
>   When they stop making them, I won't buy
>   any of their other stuff.
>

*shrug*, Too much ideology. If I can buy a PC equivalent mobo for under
$150 I dont care what processor it uses.
As long as it runs Linux

--
The theory of Communism may be summed up in one sentence: Abolish all
private property.

Karl Marx

On 30/10/2023 08:32, The Natural Philosopher wrote:
> Cambridge now lives in a bubble of progressive liberal ideologies that
> are strangling it commercially: Everyone I know who doesn't tolerate
> that shit, leaves.

Yes I loved Cambridge, but in the end had to leave, and I certainly
don't miss my commute from St Neots 20 miles away.

The easiest way was by car during the school holidays, 30 minutes in 40
minutes back, add another 15 minutes in term time. But that was before
the company moved offices to one without car parking, and the new
traffic restrictions in the centre. Using the park and Ride at
Maddeningly Road would add two bus journeys and over half an hour more
each way.

The best way was actually by train, as the office was on Station Road,
but I would have to drive to 20 miles south to the nearest train station
to get a reasonable fair, as the prices on the east coast mainline from
St Neots stations were ridiculous. Luckily Baldock station was on the
way to my wife's work so she was able to drop me off, until we had kids
and then that meant leaving too early to get them to nursery.

So I ended up for the last few nightmare years dropping the kids off at
nursery at 8am and getting the 8:06 bus from 50 yards down the road,
which should get in at 8:46 and a short walk to work. Only it never did,
9:30 if I was lucky, 10:30 a lot of the time, and another hour and a
quarter to get home in the evening. The main problem being cyclists in
the bus lane - no point in having a bus lane if the bus is continuously
having to have to pull out in to general traffic to go around cyclists.

---druck

On 28/10/2023 16:03, Joerg Walther wrote:
> 56d.1152 wrote:
>
>> But, should I spend $$$ on a 4 when the 5s are
>> soon to hit the market ??? They're claiming
>> at least TWICE the performance (I guess at the
>> same power-consumption).
>
> Unfortunately, power consumption is much higher and you need a much
> stronger PSU. I'm not getting one since I do not need this kind of
> performance on a Pi.

Don't confuse the power supply with power usage. The large supply is to
be able to deliver more power to the USB ports and the new PCIe port. If
you don't need that, you can use the Pi 4 supply.

---druck

On 02/11/2023 10:05, druck wrote:
> On 30/10/2023 08:32, The Natural Philosopher wrote:
> > Cambridge now lives in a bubble of progressive liberal ideologies that
> > are strangling it commercially: Everyone I  know who doesn't tolerate
> > that shit, leaves.
>
> Yes I loved Cambridge, but in the end had to leave, and I certainly
> don't miss my commute from St Neots 20 miles away.
>
> The easiest way was by car during the school holidays, 30 minutes in 40
> minutes back, add another 15 minutes in term time. But that was before
> the company moved offices to one without car parking, and the new
> traffic restrictions in the centre. Using the park and Ride at
> Maddeningly Road would add two bus journeys and over half an hour more
> each way.
>
> The best way was actually by train, as the office was on Station Road,
> but I would have to drive to 20 miles south to the nearest train station
> to get a reasonable fair, as the prices on the east coast mainline from
> St Neots stations were ridiculous. Luckily Baldock station was on the
> way to my wife's work so she was able to drop me off, until we had kids
> and then that meant leaving too early to get them to nursery.
>
> So I ended up for the last few nightmare years dropping the kids off at
> nursery at 8am and getting the 8:06 bus from 50 yards down the road,
> which should get in at 8:46 and a short walk to work. Only it never did,
> 9:30 if I was lucky, 10:30 a lot of the time, and another hour and a
> quarter to get home in the evening. The main problem being cyclists in
> the bus lane - no point in having a bus lane if the bus is continuously
> having to have to pull out in to general traffic to go around cyclists.
>
> ---druck
>
>
Yup. Unless you live in Cambridge getting to work there is murder.
When I had a business in the business park. it was quicker to drive 22
miles to my house in Suffolk than to the train station.

They (the council) wanted a carless cyclist's paradise with no industry
and that is exactly what they are getting.

--
New Socialism consists essentially in being seen to have your heart in
the right place whilst your head is in the clouds and your hand is in
someone else's pocket.

On 02/11/2023 13:22, druck wrote:
> On 28/10/2023 16:03, Joerg Walther wrote:
>> 56d.1152 wrote:
>>
>>> But, should I spend $$$ on a 4 when the 5s are
>>>    soon to hit the market ??? They're claiming
>>>    at least TWICE the performance (I guess at the
>>>    same power-consumption).
>>
>> Unfortunately, power consumption is much higher and you need a much
>> stronger PSU. I'm not getting one since I do not need this kind of
>> performance on a Pi.
>
> Don't confuse the power supply with power usage. The large supply is to
> be able to deliver more power to the USB ports and the new PCIe port. If
> you don't need that, you can use the Pi 4 supply.
>
> ---druck
>
I figured that out - the USB ports are much beefier, and a Pi5 is my
fallback if I cant run all my USB drives on a pi 4...

--
Labour - a bunch of rich people convincing poor people to vote for rich
people by telling poor people that "other" rich people are the reason
they are poor.

Peter Thompson

On Thu, 2 Nov 2023 16:11:51 +0000
The Natural Philosopher <tnp@invalid.invalid> wrote:

> They (the council) wanted a carless cyclist's paradise with no industry
> and that is exactly what they are getting.

That's not the council that's the university - bear in mind that
the Guildhall is built on university land.

--
Steve O'Hara-Smith
Odds and Ends at http://www.sohara.org/
Host: Beautiful Theory meet Inconvenient Fact
Obit: Beautiful Theory died today of factual inconsistency

The Natural Philosopher <tnp@invalid.invalid> wrote:
> They (the council) wanted a carless cyclist's paradise with no industry
> and that is exactly what they are getting.

To put a counter example, albeit not going to work, I today went into
Cambridge. I left home (Comberton) 13:15, drove 5 miles to Madingley P&R,
parked easily (170 spaces), and caught the 13:30 PR1 bus. Arrived Round
Church at 13:40. Did half a dozen bits of shopping (Cotswold, M&S, WH
Smith, Raspberry Pi, John Lewis) in next 30 mins. Caught the return P&R
waiting on St Andrews St. 15 minutes to P&R. 10 minutes home.

All fast, easy. Total in/out travel time less than 50 mins.

--
Paul at the paulhardy.net domain

On 02/11/2023 17:13, Ahem A Rivet's Shot wrote:
> On Thu, 2 Nov 2023 16:11:51 +0000
> The Natural Philosopher <tnp@invalid.invalid> wrote:
>
>> They (the council) wanted a carless cyclist's paradise with no industry
>> and that is exactly what they are getting.
>
> That's not the council that's the university - bear in mind that
> the Guildhall is built on university land.
>
I am afraid the University's purlieu does not extend to every
residential street in the town...

--
If I had all the money I've spent on drink...
...I'd spend it on drink.

Sir Henry (at Rawlinson's End)

On 02/11/2023 20:52, Paul Hardy wrote:
> The Natural Philosopher <tnp@invalid.invalid> wrote:
>> They (the council) wanted a carless cyclist's paradise with no industry
>> and that is exactly what they are getting.
>
> To put a counter example, albeit not going to work, I today went into
> Cambridge. I left home (Comberton) 13:15, drove 5 miles to Madingley P&R,
> parked easily (170 spaces), and caught the 13:30 PR1 bus. Arrived Round
> Church at 13:40. Did half a dozen bits of shopping (Cotswold, M&S, WH
> Smith, Raspberry Pi, John Lewis) in next 30 mins. Caught the return P&R
> waiting on St Andrews St. 15 minutes to P&R. 10 minutes home.
>
> All fast, easy. Total in/out travel time less than 50 mins.

That's during the day! Try coming in at 0800 and leaving at 1700.

---druck

In comp.os.linux.misc The Natural Philosopher <tnp@invalid.invalid> wrote:
> On 11/08/2023 13:20, Ahem A Rivet's Shot wrote:
>> On Fri, 11 Aug 2023 12:21:01 +0100
>> The Natural Philosopher <tnp@invalid.invalid> wrote:
>>
>>> Yes, that is what I found, also. Essentially a read is between ten
>>> and a thousand times less destructive than a write.
>>>
>>> But in the context of a PI running Raspios or other Linux, with
>>> adequate RAM, 99.99% of reads will be from cache, not the card,
>>> anyway. So you can safely ignore this theoretical issue
>>
>> You pretty much have to ignore it anyway it's all internal to
>> the device where you have no access to change anything.
>>
> Well not exactly, the argument was about minimising reads as well as
> writes to minimise wear.
>
> My point was to get back from armchair theorising to practicalities.
> In practice the disk cache reduces regular reads issues to the card,
> to zero.

For what you've described as your use cases for the PI's, yes, the
Linux disk cache should minimize the number of reads that hit the SD
card. That is once it has booted and reached its normal operational
steady state.

You should end up seeing very close to zero reads and writes to the PI
sd cards given what you've described to us. Certianly a low enough
rate that even a less than stellar card should last for quite a long
time.
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On Wed, 6 Sep 2023 20:49:30 -0000 (UTC), in
<udaokq$2dslj$3@dont-email.me>, Martin Gregorie
<martin@mydomain.invalid> wrote:

>On Wed, 06 Sep 2023 18:45:43 +0000, Jim H wrote:
>
>> Really? I had a drive thru ATM reboot on me once, The boot screen said
>> it was running Windows.
>>
>There are several ATM manufacturers, and anyway the models I worked on in
>the late '80s and '90s are quite unlikely to be around now. I forget who
>made the ATM varieties I was familiar with or what, if any OS, their FSMs
>or equivalent ran on: its quite likely that some ATM makes and models ran
>under Windows.

The one that rebooted on me and displayed a Windows screen did so
maybe a year ago. If it mentioned what version of Windows, I don't
recall.
--
Jim H
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From: Tauno Voipio <tauno.voipio@notused.fi.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Limiting the capacity of SD cards for the pi
Date: Wed, 20 Sep 2023 16:15:44 +0300
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On 19.9.2023 13.16, Chris Elvidge wrote:
> On 19/09/2023 08:02, The Natural Philosopher wrote:
>> On 18/09/2023 20:54, druck wrote:
>>> On 18/09/2023 09:29, Ian wrote:
>>>> If you log in as "root", or get a root shell by calling "sudo bash",
>>>> things work as expected:
>>>
>>> sudo -i
>>>
>>> is quicker to type.
>>>
>>> ---druck
>>>
>> su - is even quicker
>>
>
> 'su -' needs a password entered (on my system(s))

So should all other methods to aquire superuser privileges.

There seems to be around RaspiOS setups with one user
permitted in the /etc/sudoers without password.

--

-TV

.
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From: Theo <theom+news@chiark.greenend.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: PCBs available
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Pancho <Pancho.Jones@proton.me> wrote:
> I assumed it was a standard board. A 5v/240v relay is a common
> requirement. I used a very similar board, before I switched to using
> Shelly/Sonoff type devices. It even had 4 relays, when I only wanted one.

Chinese relay boards aren't uncommon, eg:
https://www.ebay.co.uk/itm/262499095094

- on that one there are optocouplers between the inputs and the relay coils,
for some reason (maybe they were cheaper than transistors, or they really
don't trust the relays' isolation?)

The nice thing about TNP's board is there's a mains to 5V converter on
board, which means you can power the board from the mains that you're
switching. Otherwise you need to arrange for a separate DC power supply,
and that gets annoying in a tight space - with this board you don't need a
separate power supply for the Pi.

Theo
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On 2023-08-11 17:48, Jörg Lorenz wrote:
> Am 11.08.23 um 17:21 schrieb The Natural Philosopher:
>> On 11/08/2023 13:24, Jörg Lorenz wrote:
>>> Am 11.08.23 um 11:54 schrieb The Natural Philosopher:
>>>> Doing the research reveals the true case about wear on flash memory
>>>> style devices and that is that substantially reads do *not* damage the
>>>> cells at all, at least no more than reading, say, DRAM. It is block
>>>> erases and writes that do and so, paradoxically, when used as a PROM,
>>>> probably wear levelling is entirely unnecessary. And if done
>>>> gratuitously may actually reduce lifetime. By 'gratuitously;, I mean
>>>> that it is done when there is no write operation in progress.
>>>> I cannot see any reason why one would shuffle blocks around *except* as
>>>> a result of a write operation, however.
>>>>
>>>> There appears to be one aspect of read operations that *does* disturb
>>>> the data (read distrurbance), and that is that read operations can
>>>> minutely affect the state of physically adjacent but unread cells.
>>>> However this is generally at least an order of magnitude below write
>>>> damage, and is normally dealt with by error correction.
>>>>
>>>> So smart SSDS with good wear levelling will *occasionally* rewrite read
>>>> only blocks, but this is in terms of hundreds of thousands of reads.
>>>>
>>>> In my particular application the reads to reasonably static
>>>> configuration files will exceed 32 million per annum, or rather they
>>>> would *without disk caching*...
>>>>
>>>> Now I am unaware as to how long Linux will regard a read only file that
>>>> is fully cached (my files are less than 1kBytes) as valid. I cannot
>>>> see *any* reason why re-reading file data that the operating systems
>>>> *knows* has not changed, would result in any actual 'physical' reads to
>>>> the SD card *at all*.
>>>>
>>>> And in fact in my particular application one code and data is loaded,
>>>> even changing the configurations files should not result in a physical
>>>> read, as the disk cache itself used to do the writing will retain the
>>>> information.
>>>>
>>>> I think the summary of all of this research is significant for PI users
>>>> running Linux in what may be generally classed as 'read often, write
>>>> seldom' accesses to an SD card, and that is that by far and away the
>>>> greatest protection the card has is the Linux disk buffering algorithm
>>>> itself, provided that constant reads do not exceed its capacity. In a
>>>> typical 24x7 applications there is no reason why, post boot, any SD
>>>> reads should happen *at all*, once the disk cache is full. It also shows
>>>> the absolutely vital role that '-noatime' plays in protecting read only
>>>> files that are read continuously from producing unwanted writes.
>>>>
>>>> As far as writes go there will (nearly) always be a 1:1 correlation
>>>> eventually between writes to the linux file system and writes to the SD
>>>> card: The exception being data that us rewritten to the same disk file
>>>> cache before it gets flushed to physical storage.
>>>>
>>>> So the general rule in utilising the SD card in the most effective
>>>> manner, is to reduce writes to a minimum by firstly mounting the card
>>>> -noatime, and secondly using RAM disks to do any logging that you can't
>>>> turn off, and for all operations where ephemeral data are being recorded
>>>> and read, but which do not need to survive a reboot. Then, having a
>>>> superfluity of RAM available for disk caching will reduce SD *reads* to
>>>> essentially zero. No matter how often the file system is accessed by the
>>>> application.
>>>>
>>>> And in fact using iostat on my running application shows no (physical)
>>>> reads or writes *AT ALL*. As evinced by the rock steady light on the Pi
>>>> Zero.
>>>
>>> What exactly is your question?
>>>
>> My question is "Why did you think that a post has to be a question?"
>
> Because the posting otherwise is unsoliceted spam?

Not correct.

As we are in a Linux group, you might remember that Linus posted his
first kernel here (on comp.os.minix) and it was not a question.

>
>> This is information for Pi people using SD cards. Condensing a mornings
>> research into some general practical conclusions.
>>
>> If you are not interested in it, just skip it.
>
> I'll ask when I am interested.
>

--
Cheers, Carlos.

.
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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.os.linux.misc,comp.sys.raspberry-pi
Subject: Weird code crash
Date: Thu, 14 Sep 2023 06:23:15 +0100
Organization: A little, after lunch
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I don't expect people to know the answer, but I could use some help in
puzzling out where to look.

I had a power cut that did leave my network a bit sketchy and it took
two reboots on this desktop to get back to normal. This may or may not
be relevant.

But my question refers to my Pi Zero W server I am developing.

It came up, ok, but then after a while my relay daemon crashed...

Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Main
process exit
ed, code=killed, status=6/ABRT
Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Failed
with resul
t 'signal'.
Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Consumed
15.074s
CPU time.

I rebooted it, and after awhile - about ten minutes, it happened again -
that is the above trace.

I restarted it manually, and it hasn't crashed since.

The web is flooded with instances of this messaqe all on different
platforms and applications, and it would appear this is a very generic
message possibly to do with memory issues.

One person 'fixed' it by changing CPUs...
Now *as far as I know* there was nothing special about the data the
daemon would be operating on it this point to cause it to crash. I am
fairly sure I have no memory leaks in it - in normal operation it
strdups() and frees() and opens and closes files... and 'top' shows
memory usage is rock steady.

One possibility is that it is opening and reading a file at the precise
time another process is writing it...in both cases the read and write
operations are atomic and done with C code.

READ
====
fp=fopen(fullname, "r");
len=fread(filbuf,1,255,fp); // read entire file

WRITE
=====
fp=fopen(filename, "w");
if (fp)
{
fprintf(fp,"%s%s\n",filedata,timestamp);
fclose(fp);
}

Could this cause a problem?

I tend to suspect some sort of asynchronous timing issue because it is
such a rare occurrence. I have been utterly unable to make it happen on
demand...

--
A lie can travel halfway around the world while the truth is putting on
its shoes.
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From: Bob Latham <bob@sick-of-spam.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Limiting the capacity of SD cards for the pi
Date: Wed, 20 Sep 2023 14:21:47 +0100
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On 8/7/23 9:55 AM, The Natural Philosopher wrote:
> On 07/08/2023 12:55, Jan Panteltje wrote:
>> No Empire Has Lasted Yet in history, US is way over the hill.
>> Likely Texas will soon leave that Union... the others will follow.
> Yes, these 19th century Empires are a bit passé..the end of Russian
> federation, the European Union, the United states - all are possible and
> more, or less likely as time moves on.
>
> In an unlikely turn of phrase, in rapidly changing world contexts, they
> are simply  too big to survive.
>
> What suits downtown New York does not suit wilderness Utah. And vice versa.
>
> federalisation at least and possible independence, whilst maintaining
> overall ties under some NATO and Interpol style pan national
> organisations would seem to be the way forward

First off, NO state will be leaving the USA - it's
actually illegal, they can and will send in the army.
Bet on it.

As for "differences" ... that was part of the whole
idea of a United STATES. Not every environment, every
local culture, every local need, is the same. Truly
"national" govts like to forget that - and it causes
BIG problems. Can even cause bloody revolutions where
everyone suffers horribly.

As for "empires" - there's a FALLACY to "empire" in
the usual meaning. They only survive by engulfing
more and more - and every bit they obtain soon
becomes a management EXPENSE. It's doomed. From
Sumer and Akkadia all the way to Rome and the
Mongols and Ottomans, this has been the horrible
horrible truth of "empires". They are about EGO,
not fiscal reality.

But then this was SUPPOSED to be about what to do
with /var/log :-)
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From: Richard Kettlewell <invalid@invalid.invalid>
Newsgroups: comp.os.linux.misc,comp.sys.raspberry-pi
Subject: Re: Weird code crash
Date: Thu, 14 Sep 2023 09:23:01 +0100
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Theo <theom+news@chiark.greenend.org.uk> writes:
> In comp.sys.raspberry-pi The Natural Philosopher <tnp@invalid.invalid> wrote:
>> Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Main
>> process exit
>> ed, code=killed, status=6/ABRT
>> Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Failed
>> with resul
>> t 'signal'.
>> Sep 13 11:26:36 heating-controller systemd[1]: relayd.service: Consumed
>> 15.074s
>> CPU time.
>>
>> I rebooted it, and after awhile - about ten minutes, it happened again -
>> that is the above trace.
>>
>> I restarted it manually, and it hasn't crashed since.
>>
>> The web is flooded with instances of this messaqe all on different
>> platforms and applications, and it would appear this is a very generic
>> message possibly to do with memory issues.
>
> You're getting SIGABRT which is typically something bailing due to memory
> corruption, eg corrupting metadata so that malloc can't work, or a
> double-free.
>
> I would compile it with debugging enabled: '-g' or '-ggdb' flag to your
> compiler. Then run it under gdb:
>
> $ gdb ./myprog
> (gdb) run
>
> and see if it dies. If it does you can get a backtrace to indicate where
> the fault occurred:
>
> (gdb) bt
>
> It may be that starting it under systemd is different in some way that it
> doesn't show up when running it by hand. You could try setting as your
> systemd command:
>
> gdb -ex run -ex bt --args /usr/local/bin/myprog arg1 arg2
>
> which will run it and then dump a backtrace when it's finished. You may get
> 'no stack' if it succeeded and didn't record one.

Also:

* I would also have a look at the kernel log; if it’s a kernel-generated
signal then there’s usually a log message about it.

* Run the application under valgrind; depending what the issue is, that
will provide a backtrace and perhaps more detailed information. If it
is a memory corruption issue then it may identify where the corruption
happens, rather than the later point where malloc failed a consistency
check (or whatever it is).

Using valgrind (and/or compiler sanitizer features) is a good idea even
before running into trouble, really.

--
https://www.greenend.org.uk/rjk/
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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Limiting the capacity of SD cards for the pi
Date: Wed, 20 Sep 2023 17:44:29 +0100
Organization: A little, after lunch
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On 20/09/2023 16:36, Bob Latham wrote:
> In article <ueespp$2v1m1$1@dont-email.me>,
> The Natural Philosopher <tnp@invalid.invalid> wrote:
>
>
>> That's right. If you are sitting on the mounted mount point, it
>> cant get off! It will say 'busy'
>
> Right but that's not the reason the whole thing did nothing *after* I
> corrected that ????
>
> Bob.
>
I thought you said you unmounted it after that

--
Socialism is the philosophy of failure, the creed of ignorance and the
gospel of envy.

Its inherent virtue is the equal sharing of misery.

Winston Churchill

.
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From: Theo <theom+news@chiark.greenend.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: PCBs available
Date: 13 Oct 2023 15:09:41 +0100 (BST)
Organization: University of Cambridge, England
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Andy Burns <usenet@andyburns.uk> wrote:
> Theo wrote:
>
> > It's a bit annoying... with no DC in the box and not wanting to risk
> > exporting mains to the Pi, or making another box with a relay, the
> > obvious option is an optocoupler, but you can't really ensure good
> > isolation unless you put it in a good enclosure, which is tricky here
> > because I'm shoving it in an existing mains box dangling on flying
> > leads. Aha, I thought, you can get optotriacs to switch AC, so what
> > about if I just get a phototriac and shine a light at it to trigger the
> > triac instead of having the LED in the optotriac. Trouble is,
> > phototriacs don't exist as a discrete component.
>
> Can't you "snap" one of these in half?
>
> <https://cpc.farnell.com/omron-electronic-components/ee-sx4070/opto-switch-slotted/dp/SC12350?>

On 11/2/23 6:05 AM, druck wrote:
> On 30/10/2023 08:32, The Natural Philosopher wrote:
> > Cambridge now lives in a bubble of progressive liberal ideologies that
> > are strangling it commercially: Everyone I  know who doesn't tolerate
> > that shit, leaves.
>
> Yes I loved Cambridge, but in the end had to leave, and I certainly
> don't miss my commute from St Neots 20 miles away.
>
> The easiest way was by car during the school holidays, 30 minutes in 40
> minutes back, add another 15 minutes in term time. But that was before
> the company moved offices to one without car parking, and the new
> traffic restrictions in the centre. Using the park and Ride at
> Maddeningly Road would add two bus journeys and over half an hour more
> each way.
>
> The best way was actually by train, as the office was on Station Road,
> but I would have to drive to 20 miles south to the nearest train station
> to get a reasonable fair, as the prices on the east coast mainline from
> St Neots stations were ridiculous. Luckily Baldock station was on the
> way to my wife's work so she was able to drop me off, until we had kids
> and then that meant leaving too early to get them to nursery.
>
> So I ended up for the last few nightmare years dropping the kids off at
> nursery at 8am and getting the 8:06 bus from 50 yards down the road,
> which should get in at 8:46 and a short walk to work. Only it never did,
> 9:30 if I was lucky, 10:30 a lot of the time, and another hour and a
> quarter to get home in the evening. The main problem being cyclists in
> the bus lane - no point in having a bus lane if the bus is continuously
> having to have to pull out in to general traffic to go around cyclists.

If you want sane CHANGES ... you HAVE to provide
ALTERNATIVE FACILITIES and suck-in a lot of the
top names from Cambridge/Oxford.

It'll also need FUNDING - from the old-school Old Money,
alumni and beyond.

Likely, if anybody looks closely enough, there's surely some
ed-expansion legislation buried in the books - where the
govt HAS to offer money/incentives/breaks (beware any COSTS
associated).

Oh, give the new schools decent Olde England city/place
names. It'll go a long way for psychological reasons.

In short, DRAIN the ultra-Wokie universities until they
either have to change, or vanish. A pity, yes, but ...

SAME issues now in the USA as well. Even many "liberals"
are advising the youth to NOT attend the "Ivy League"
universities because they just make kiddies into STUPID
hyper-lefty idiot-activists.

Again, ALTERNATIVES are the best answer. Not EASIEST,
but BEST. A new "Ivy League" ... dedicated to great
ed, not the latest political trends.

But we've kind of left the r-PI universe here ....

Found some more dox on the Pi5 today.

It CAN run on a regular Pi4/USB-C power supply.

UNLESS you need a lot more amperage.

THEN you need a "USB-C/PD" ... I suspect that
means "Power Detection" ... power supply. Seems
the Pi5 has special circuitry that can "talk"
to those kinds of supplies.

More complexity is usually NOT so good - and
usually COSTS you as well.

Anyway, if you HAVE to have three mag USB drives
and a coffee-warmer attached to yer Pi5 then you
will have to buy a 'PD' unit.

If Pi goes any further, well, may as well just
buy a NUC or related running Winders ..... saw
one today (some "Bee"-named things) with the
cheapest under $200 US and fair reviews.

Pi was successful because it fit into a *niche*
between microcontrollers and "real PCs" (and
was cheap/compact). If they slide out of that
niche though there's just no POINT to them.

In article (Dans l'article)
<_2qdnflafPktVdT4nZ2dnZfqn_ednZ2d@earthlink.com>, 56d.1152
<56d.1152@ztq9.net> wrote (écrivait) :

> you need a "USB-C/PD" ... I suspect that means "Power Detection" ...
> power supply

Power Delivery
<https://en.wikipedia.org/wiki/USB_hardware#USB_Power_Delivery>

--
Jean-Pierre Kuypers

On 11/7/23 5:41 AM, Jean-Pierre Kuypers wrote:
> In article (Dans l'article)
> <_2qdnflafPktVdT4nZ2dnZfqn_ednZ2d@earthlink.com>, 56d.1152
> <56d.1152@ztq9.net> wrote (écrivait) :
>
>> you need a "USB-C/PD" ... I suspect that means "Power Detection" ...
>> power supply
>
> Power Delivery
> <https://en.wikipedia.org/wiki/USB_hardware#USB_Power_Delivery>
>

Thanks.

In any event the Pi5 "talks" to it somehow when
it needs a big burst of amperage.

On 08/11/2023 04:08, 56d.1152 wrote:
> burst of amperage.

The word you want is current.

On 11/8/23 2:35 AM, mm0fmf wrote:
> On 08/11/2023 04:08, 56d.1152 wrote:
>> burst of amperage.
>
> The word you want is current.

Same thing. 'Amperage' is a volume of
electrons/charge-carriers per unit time
So is 'electrical current'.