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by jahboater
Sun Jul 26, 2020 6:04 pm
Forum: General discussion
Topic: Does Raspberry PI 4 have problems in 2020?
Replies: 45
Views: 2878

Re: Does Raspberry PI 4 have problems in 2020?

W. H. Heydt wrote:
Sun Jul 26, 2020 5:42 pm
GlowInTheDark wrote:
Sun Jul 26, 2020 5:16 pm
To use 8 GB of RAM, you need to use a 64 bit operating system.
False.
Incomplete. RPiOS32 can use the whole 8GB, but no one process can use more than 3GB.
Inefficient. RPiOS32 uses LPAE and has to page stuff in and out all the time.
by jahboater
Sun Jul 26, 2020 10:07 am
Forum: General discussion
Topic: Sysbench testing with different OSes - values I dind't expect
Replies: 4
Views: 312

Re: Sysbench testing with different OSes - values I dind't expect

Why has raspberry OS 32bit so low values compared to 64bit Versions? I've checked multiple times. That question is easy. Sysbench is a simplistic prime number benchmark using 64-bit integer arithmetic (because its for databases) and is heavily dependent on 64-bit division. 64-bit division on the 32...
by jahboater
Sun Jul 26, 2020 7:19 am
Forum: Troubleshooting
Topic: Rpi4 - Extremely unstable ethernet connection
Replies: 14
Views: 511

Re: Rpi4 - Extremely unstable ethernet connection

but I would really enjoy another ethernet port :lol: You could try a USB adapter. I used these for earlier Pi's to get faster than 100MBs. https://www.amazon.co.uk/Anker-AK-A7611011-USB-Ethernet-Network-Card-Adaptor/dp/B00PC0P2DI/ref=asc_df_B00PC0P2DI/?tag=googshopuk-21&linkCode=df0&hvadid=31058497...
by jahboater
Fri Jul 24, 2020 8:57 pm
Forum: Beginners
Topic: Questions about getting a Pi - best vendor, price, 2 or 4GB?
Replies: 7
Views: 252

Re: Questions about getting a Pi - best vendor, price, 2 or 4GB?

HvdW wrote:
Fri Jul 24, 2020 8:07 pm
get the most recent revision of RPI 4
The 8GB model is guaranteed to be the latest version to date.
That is, version 1.4

Forget the Pi3, it is inferior to the Pi4 in every respect.
by jahboater
Fri Jul 24, 2020 7:06 pm
Forum: General discussion
Topic: Windows on ARM
Replies: 36
Views: 1260

Re: Windows on ARM

There are Intel SBC's around.
The Odroid H2+ is one case.
https://www.hardkernel.com/shop/odroid-h2plus/

Much more expensive than the Pi of course, and probably more power hungry.
by jahboater
Fri Jul 24, 2020 5:01 pm
Forum: Beginners
Topic: Questions about getting a Pi - best vendor, price, 2 or 4GB?
Replies: 7
Views: 252

Re: Questions about getting a Pi - best vendor, price, 2 or 4GB?

I am in the US. See https://www.raspberrypi.org/products/raspberry-pi-4-model-b/?variant=raspberry-pi-4-model-b-8gb Any recommendations for where to get it for best price / quality (the pi is centrally made / all vendors get from the same source The Pi organization? but power supply and case are th...
by jahboater
Fri Jul 24, 2020 9:15 am
Forum: Troubleshooting
Topic: What are all of Raspberry Pi 4 Problems? [locked spambot post]
Replies: 10
Views: 641

Re: What are all of Raspberry Pi 4 Problems?

The majority of users do not need any cooling whatsoever, just choose a good case or leave it without :shock: Yes. The cooling is not a "problem" as such. With poor ventilation and an extreme workload, it might possibly throttle - giving reduced performance but that is all. The average smartphone d...
by jahboater
Fri Jul 24, 2020 1:10 am
Forum: Beginners
Topic: How to access to the raspberry pi 4 with the TeraTerm(SSH)
Replies: 3
Views: 163

Re: How to access to the raspberry pi 4 with the TeraTerm(SSH)

Have you enabled ssh on the Pi ?
by jahboater
Thu Jul 23, 2020 10:05 pm
Forum: Beginners
Topic: Questions about programming on the Raspberry Pi [spam]
Replies: 10
Views: 545

Re: Questions about programming on the Raspberry Pi

I believe that Thonny is the "official" RPT supported Python IDE.
(Included in Raspberry Pi OS)
by jahboater
Thu Jul 23, 2020 7:12 pm
Forum: Beginners
Topic: Questions about programming on the Raspberry Pi [spam]
Replies: 10
Views: 545

Re: Questions about programming on the Raspberry Pi

It's just a computer. A physically small, low power requirement, cheap to buy, computer. It also runs Linux (the "official" OS called Raspberry Pi OS is based on Debian Linux). Which means a wide range of high quality, and free, compilers and interpreters are either pre-installed or are mostly a si...
by jahboater
Thu Jul 23, 2020 6:55 pm
Forum: Beginners
Topic: Questions about programming on the Raspberry Pi [spam]
Replies: 10
Views: 545

Re: Questions about programming on the Raspberry Pi

Historically, "Python" is the "root" of Pi in "Raspberry Pi" and, AIUI, the "main" language used "educationally". Yes. Look at the number of posts in the "programming" part of this forum and you will see that Python is by far the most popular (or at least the most discussed) followed by C/C++. The ...
by jahboater
Thu Jul 23, 2020 8:40 am
Forum: C/C++
Topic: Raspberry Pi, Linux, GPIO, I2C, SPI, UART with C
Replies: 2
Views: 453

Re: Raspberry Pi, Linux, GPIO, I2C, SPI, UART with C

Take a look at the pigpio library: http://abyz.me.uk/rpi/pigpio/ C example code: http://abyz.me.uk/rpi/pigpio/examples.html#C%20code See also "Minimal GPIO access" here for some example code directly using the GPIO in C: http://abyz.me.uk/rpi/pigpio/examples.html#Miscellaneous%20related%20code
by jahboater
Wed Jul 22, 2020 6:14 pm
Forum: General discussion
Topic: How many "5.4 broke..." threads before it is reverted?
Replies: 73
Views: 3325

Re: How many "5.4 broke..." threads before it is reverted?

That is the generalized reason I'm holding off upgrading my USB MSD test system for the time being. Though the only breakage I've seen that causes me to hesitate is the "fail to start CPU1" problem, and--for my uses--that is not a critical issue. The 64-bit beta OS also uses 5.4, and I have seen no...
by jahboater
Wed Jul 22, 2020 12:03 am
Forum: General discussion
Topic: Pi 4 - a total failure
Replies: 56
Views: 3109

Re: Pi 4 - a total failure

Another thing to narrow down the possibilities would be to try PINN -- which is developed from NOOBS but has more refinements to its usability. If PINN works where NOOBS fails, that might persuade RPT to withdraw NOOBS in favour of PINN. (I think PINN works with either HDMI, but I may be mistaken a...
by jahboater
Tue Jul 21, 2020 9:32 pm
Forum: General discussion
Topic: Strange CC error
Replies: 3
Views: 121

Re: Strange CC error

Yes, and
C compiler cannot create executables
may indicate the SD card is not writeable, or at least the file system.
by jahboater
Tue Jul 21, 2020 2:02 pm
Forum: General discussion
Topic: gpio time resolution upto nano second
Replies: 6
Views: 241

Re: gpio time resolution upto nano second

Probably the best clock is clock_gettime(CLOCK_MONOTONIC_RAW), but see the result of clock_getres() for the actual precision. I see on the Pi4 running Raspberry Pi OS 64-bit, that clock_getres() is reporting one nano-second. Surprising - I was expecting one micro-second. Anyone know if getres() is c...
by jahboater
Tue Jul 21, 2020 8:09 am
Forum: Advanced users
Topic: Why do SD cards slow down with too much writing?
Replies: 3
Views: 194

Re: Why do SD cards slow down with too much writing?

If you are using images, then you do not need to format the card first.
That should save a few writes.
by jahboater
Tue Jul 21, 2020 6:33 am
Forum: General discussion
Topic: Pi 4 - a total failure
Replies: 56
Views: 3109

Re: Pi 4 - a total failure

- any new purchaser should be able to follow the rules and load a NOOBS card, yet it does not work. You have yet to post any details of your problem and hardware setup, so that people on the forum can help. Have you read carefully the link posted in the first reply? https://www.raspberrypi.org/help...
by jahboater
Tue Jul 21, 2020 2:29 am
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 151
Views: 21232

Re: A Pi Pie Chart

ejolson wrote:
Tue Jul 21, 2020 12:50 am
The Zero gcc 10.1 has Raspberry Pi ratio=1.4089
Which matches the clock speed ratio 1000/700 near enough.

Perhaps for interest, run the Pi4 at 2000Mhz (say) and check you get 2000/1500 extra performance?
You need over_voltage=5 by the way.
by jahboater
Sun Jul 19, 2020 3:18 pm
Forum: Troubleshooting
Topic: Raspberry Pi 4 4GB Ram Not Working
Replies: 26
Views: 827

Re: Raspberry Pi 4 4GB Ram Not Working

Why is there only one Raspberry on the top left of the screen?
The Pi4 has 4 cores.
by jahboater
Sun Jul 19, 2020 9:17 am
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 151
Views: 21232

Re: A Pi Pie Chart

Note this is a Pi Zero compiling the C, C++ and Fortran language options with a non-encrypted iSCSI root mounted over the USB Ethernet gadget. That's a lot faster than NFS root, but still as slow as a slow thing on a slow day in Slowville. On PC's with lots of memory I do the entire download, build...
by jahboater
Sun Jul 19, 2020 9:03 am
Forum: General discussion
Topic: Which OS will be fast and efficient for raspberry pi 4 8GB model for a industrial product application
Replies: 9
Views: 558

Re: Which OS will be fast and efficient for raspberry pi 4 8GB model for a industrial product application

Now my question is that, when we are running our application program on boot using systemd services then entire processor will only runs my single program or is ubuntu os also runs on background ? I am asking this question because, i assume like ubuntu OS applications can be used for developing a p...
by jahboater
Sun Jul 19, 2020 3:40 am
Forum: General discussion
Topic: A Pi Pie Chart
Replies: 151
Views: 21232

Re: A Pi Pie Chart

I would just leave the Zero for the weekend!
50 hours plus is the norm :(

I always find it amazing that such a tiny and cheap computer can complete such a huge task at all.
by jahboater
Sat Jul 18, 2020 10:14 pm
Forum: General programming discussion
Topic: Changing bash working directory within a program
Replies: 14
Views: 662

Re: Changing bash working directory within a program

Temporarily changing directory for a program is normally done with brackets: (cd newdir; program) For example: pi@raspberrypi:~ $ pwd /home/pi pi@raspberrypi:~ $ (cd /etc/ssh; ls -l) total 596 -rw-r--r-- 1 root root 565189 Jan 31 20:55 moduli -rw-r--r-- 1 root root 1580 Jan 31 20:55 ssh_config -rw--...

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