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by jahboater
Mon Nov 16, 2020 12:17 pm
Forum: General discussion
Topic: How necessary is extra cooling for the RPi4 now?
Replies: 51
Views: 3246

Re: How necessary is extra cooling for the RPi4 now?

I wouldn't say far lower but yes, I know. under 100% CPU usage I was still getting a over-heating warning and throttling. :) That's interesting. I have a Pi4 here with no cooling at all, not even a stick on heat sink, and its ventilation is mostly blocked by a HAT. I tried running this for about 1/...
by jahboater
Mon Nov 16, 2020 11:31 am
Forum: General discussion
Topic: How necessary is extra cooling for the RPi4 now?
Replies: 51
Views: 3246

Re: How necessary is extra cooling for the RPi4 now?

thatchunkylad198966 wrote:
Mon Nov 16, 2020 11:28 am
When I first got my RPI4, (day of release) the heat was scary, I managed to get a fanshim and haven't looked back!
40c idle and 65c under full load.
Did you know that some time ago the engineers sorted the firmware and running temps are far lower than on the day of release?
by jahboater
Mon Nov 16, 2020 11:13 am
Forum: C/C++
Topic: Which programming language to learn first
Replies: 34
Views: 1327

Re: Which programming language to learn first

So I recommend it to everybody who wants to become proficient in C, but maybe not as the very first thing you read about it or you might get overwhelmed. Definitely worth picking it up, though. K&R is a truly great book written by the creators of the language - but its quite expensive: https://www....
by jahboater
Mon Nov 16, 2020 11:01 am
Forum: C/C++
Topic: Which programming language to learn first
Replies: 34
Views: 1327

Re: Which programming language to learn first

OMG, do you honestly advice a newbie to learn C by reading the K&R monster...??? I did! But then I already knew B (and BCPL and Algol68). Its quite a small book actually. I agree this is as good a book as any to get started with: https://magpi.raspberrypi.org/books/essentials-c-v1 The main thing is...
by jahboater
Mon Nov 16, 2020 10:34 am
Forum: General discussion
Topic: How necessary is extra cooling for the RPi4 now?
Replies: 51
Views: 3246

Re: How necessary is extra cooling for the RPi4 now?

A PC in the office started running very slowly for no obvious reason. It wasn't a Windows problem. Turned out to be the fan had died and the CPU was overheating and throttling. A common problem with fans is the accumulation of dust which in time can block the cooling fins and cause overheating. I li...
by jahboater
Sun Nov 15, 2020 10:04 pm
Forum: Advanced users
Topic: Update Python 3?
Replies: 13
Views: 600

Re: Update Python 3?

GlowInTheDark wrote:
Sun Nov 15, 2020 9:12 pm
Given how much people on this forum like to go on and on about "security", this should be pretty obvious.
No. It's all in plain text, all visible, nothing hidden.
Take a look!

If its too difficult to understand then perhaps "Advanced users" is the wrong forum.
by jahboater
Sun Nov 15, 2020 7:57 pm
Forum: Beginners
Topic: Is it possible to do DD of the raspbian disk when the PI is running?
Replies: 17
Views: 651

Re: Is it possible to do DD of the raspbian disk when the PI is running?

2) The right way to do it is to ditch dd and image mode copying entirely, and use file-level copying. That way, you get the best of all worlds, including, most importantly, staying in the good graces of the FUDders on this forum. Don't want to p*** them off, do we? DD is fine. Unmount the disk firs...
by jahboater
Sun Nov 15, 2020 7:35 pm
Forum: General discussion
Topic: New Pi 4 8G won't power up
Replies: 2
Views: 160

Re: New Pi 4 8G won't power up

I read that the Pi 4 has a design flaw in the type C power supply that not comply with type C standard, That was fixed long before the 8GB model was released. Your 8GB model cannot have the problem. It may be that there is a problem with the monitor? That is, it could actually be booting fine. Howe...
by jahboater
Sun Nov 15, 2020 6:42 pm
Forum: Advanced users
Topic: Update Python 3?
Replies: 13
Views: 600

Re: Update Python 3?

This is the "Advanced users" part of the forum :) 1) If you are confident in your abilities, you can try building from source. This is, of course, easy and trivial to do - if you are the sort of person for whom things like this are easy and trivial to do. It should be simple enough to cut and paste ...
by jahboater
Sun Nov 15, 2020 3:17 pm
Forum: Raspberry Pi OS
Topic: 64bit binaries support
Replies: 2
Views: 190

Re: 64bit binaries support

Try the 64-bit version of Raspberry Pi OS (to get 64-bit user land).
http://downloads.raspberrypi.org/raspios_arm64/images/
Its in beta but works well.
by jahboater
Sun Nov 15, 2020 2:18 pm
Forum: Beginners
Topic: Is it possible to do DD of the raspbian disk when the PI is running?
Replies: 17
Views: 651

Re: Is it possible to do DD of the raspbian disk when the PI is running?

Prove it, or stop spreading more FUD. I think you might have to prove otherwise Dougie! Its always been considered bad practice and/or risky to access the raw disk below a mounted filesystem. I guess if you do "sync; dd ...", and the system is quiescent, and there is a decent filesystem with a jour...
by jahboater
Sun Nov 15, 2020 3:18 am
Forum: Beginners
Topic: Source Code question (noob)
Replies: 7
Views: 411

Re: Source Code question (noob)

Has anyone got any examples of programs to compile from source I can’t find anything basic and useful at all eg a simple text editor See the GNU software web page: https://www.gnu.org/software/software.html There are at least six editors in the list (moe, nano, ed, emacs, sed, zile). Here is the so...
by jahboater
Sat Nov 14, 2020 8:20 pm
Forum: Troubleshooting
Topic: Overclock doesn't work on RPi4
Replies: 12
Views: 425

Re: Overclock doesn't work on RPi4

I have commented #arm_freq_min=1700 because it was what i used for testing. If I uncomment it goes to 1700 locked. Never reachs 1900 for example. The 1900MHz overclock works fine in my Pi. Are you using HDMI or composite ? your settings seem contradictory. I don't know what your problem is. Perhaps...
by jahboater
Sat Nov 14, 2020 6:52 pm
Forum: Beginners
Topic: cd is not supported use full path. And access denied
Replies: 6
Views: 257

Re: cd is not supported use full path. And access denied

GlowInTheDark wrote:
Sat Nov 14, 2020 5:21 pm
I 've been had by computers since 1980
FTFY
Perhaps the OP meant the Intel 8080 ....
by jahboater
Sat Nov 14, 2020 6:33 pm
Forum: Troubleshooting
Topic: Overclock doesn't work on RPi4
Replies: 12
Views: 425

Re: Overclock doesn't work on RPi4

Could you post your config.txt ?
by jahboater
Sat Nov 14, 2020 6:29 pm
Forum: Raspberry Pi 400
Topic: The Raspberry Pi 400 thread!
Replies: 896
Views: 38986

Re: 23 fun Raspberry Pi 400 facts

andrum99 wrote:
Sat Nov 14, 2020 5:54 pm
The Pi 4B 8GB uses the C0 stepping of the BCM2711 as well.
How do I verify that please ?

"lscpu" shows the same stepping for my Pi4 8GB as it does for my Pi4 2GB
by jahboater
Sat Nov 14, 2020 4:49 pm
Forum: Troubleshooting
Topic: Overclock doesn't work on RPi4
Replies: 12
Views: 425

Re: Overclock doesn't work on RPi4

Are you aware that the OS adjusts the speed of the processor to suit the load ? At idle it will run at a low frequency to save power, and you will not see the overclock. This is one of my Pi4's. As you can see, for about 30 seconds or so, a heavy CPU load caused the clock frequency to increase up to...
by jahboater
Sat Nov 14, 2020 11:25 am
Forum: Python
Topic: Whats the best way to install 3.8?
Replies: 19
Views: 975

Re: Whats the best way to install 3.8?

fruitoftheloom wrote:
Sat Nov 14, 2020 10:58 am
https://manjaro.org/downloads/arm/raspb ... pi-4-xfce/

Manjaro being based on ARCH always have latest packages:

https://archlinuxarm.org/packages/aarch64/python
That's true of course, but installing an entire new OS to get a later version of Python seems a little extreme :)
by jahboater
Sat Nov 14, 2020 11:16 am
Forum: Beginners
Topic: Source Code question (noob)
Replies: 7
Views: 411

Re: Source Code question (noob)

Is there any limitations with using source code builds on a rpi other than it not running well due to the low powered hardware If anything, a program built from source should run faster. For example, programs distributed with the 32-bit Raspberry Pi OS are compiled for the ARMv6 - to support the ol...
by jahboater
Sat Nov 14, 2020 10:50 am
Forum: Off topic discussion
Topic: Access Raspbian disk from WIndows
Replies: 31
Views: 1490

Re: Access Raspbian disk from WIndows

Once I have pulled all that together, I'll set it up and check if it works, and then store it in a safe place. When I run into a disk problem with my main R-Pi 4, I can simply slip it's sd card into the reader and repair the error... and stay away from Windows! :D You do not need a second Pi! But y...
by jahboater
Sat Nov 14, 2020 10:06 am
Forum: Beginners
Topic: Source Code question (noob)
Replies: 7
Views: 411

Re: Source Code question (noob)

There is the standard mantra:

./configure && make && sudo make install

The && means "only start the next step if the previous step succeeded".
by jahboater
Sat Nov 14, 2020 9:00 am
Forum: Python
Topic: Whats the best way to install 3.8?
Replies: 19
Views: 975

Re: Whats the best way to install 3.8?

The latest stable release is 3.9 at the time of writing. Download the source from here: https://www.python.org/downloads/source/ To install a source release is easy: tar xf Python-3.9.0.tar.xz cd Python-3.9.0 ./configure --enable-optimizations make sudo make install Run "python3" to check you have t...
by jahboater
Sat Nov 14, 2020 5:57 am
Forum: Advanced users
Topic: Different stress tests producing different results?
Replies: 3
Views: 243

Re: Different stress tests producing different results?

The Sysbench had my CPU max at about 60C for my overclock (2GHz) while stress-ng had it doing above 80C and throttling. Why are the two tests giving such different results, and which one should I use to decide if I have a good overclock? Different instruction mixes will heat up the CPU by differing...
by jahboater
Fri Nov 13, 2020 8:53 pm
Forum: Other projects
Topic: A Birthday Present for Fido
Replies: 378
Views: 14981

Re: A Birthday Present for Fido

Heater wrote:
Fri Nov 13, 2020 8:44 pm
My new code will likely use stdbool.h. But my new code may well be calling out to old code with it's own idea of "bool".
Perhaps I should have said "code in a new project".
by jahboater
Fri Nov 13, 2020 8:29 pm
Forum: Other projects
Topic: A Birthday Present for Fido
Replies: 378
Views: 14981

Re: A Birthday Present for Fido

Until you are writing modern C and use "bool" because you cannot stand the aesthetics of "_Bool" but find yourself calling old code with it's own idea of what "bool" might mean. No. That's the whole point of the optional header file. Don't add the #include if you have an existing definition of bool...

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