Raspberry Pi Forums

ejolson

long i[3]; //If inderected. I searched on "inderected" and couldn't find a meaning. Is this a misspelling? Also, how would the union be affected by endianness? Is it being written as one type and read as the other? Sadly it did not answer my question as you don't present the source of bot the optim...

ejolson

This is not the 90's or early 2000's. Intel x86 series CPU's and AMD64 series CPU's are quickly loosing ground to ARM today. Except for the Raspberry Pi, I don't see much change taking place. ARM doesn't enter the desktop market because Windows doesn't run and there are still no good video drivers ...

ejolson

I'd recommend a Pi3B with the latest Raspbian which has chromium and flash built in. That should work for you without problems. Given these threads https://www.raspberrypi.org/forums/viewtopic.php?p=950484#p950484 https://www.raspberrypi.org/forums/viewtopic.php?p=287882#p287882 I didn't know flash...

ejolson

It could be argued that hardware optimisation makes software optimisation very much harder and ultimately futile. The usual observation is that optimizing software for cache, pipelines and other hardware features makes significant differences in performance. The Intel Math Kernel Library is an exam...

ejolson

I will not remove the content of the above post, as it is likely to many have already read it. Though please feel free to ignore the content of that post, it was a little out of hand. I read it, even though everything was marked out , and just wanted to say keep up the good work. While this forum i...

ejolson

The default clock for the Pi2B2 (the version of Pi2B using the '2837 SoC) is 900MHz, the same as the '2836 based Pi2B. This should pretty much eliminate the overheating issue *and* provide a nice performance boost over the '2836 version. Clocked at 900MHz my Pi 3 was quite stable and didn't need ov...

ejolson

As I don't seem to have provided the link in the previous post, for reference, the source code files uuencode.c and uudecode.c can be compiled on R7 to provide the uuencode and uudecode commands sufficient for transmitting binary files over the emulated 7-bit serial lines. Since vi was not included ...

ejolson

The main point of optimization is being able to do more with the HW we have, if we do not do this then we are wasting time, money, and resources by purchasing faster systems. As computers get faster, the problems they are used to solve get bigger (otherwise, what would be the point of using faster ...

ejolson

I have been hunting for some way to use my Raspberry PI 3 as a "USB device", rather than the normal "host." ( actually, as well as, rather than instead of ) I know that the "fan-out" chip makes that impossible for the on-board USB ports, but is there some add-on device that I can use that would giv...

ejolson

Hi, I have not been able to reproduce on a Raspbian Pi the vulnerability where a root initramfs shell can be achieved on a locked Linux host with a 70 second keypress. Can anyone confirm whether Raspbian is affected? By default Raspbian doesn't use an initramfs to boot. If you have set up an encryp...

ejolson

I'm planned to make an arcade, connecting 2 Pi Zero to the RPi 3 to have enough power to run the various emulators flawlessly using Lakka as an operating system. Nope, that won't work. While trying to run video-game emulators on a cluster of the Raspberry Pi's is not likely to work, programming a n...

ejolson

Hello all, I'm trying to bulletproof my install from SD card corruption due to frequent logfile writing. I'd like not to mount /var/log to a temporary file system because I'd like to be able to read them after a reboot. I was thinking about trying a custom partition layout. Say, two extra partition...

ejolson

Hi all, I am currently using raspberry pi 3 and i would like to ask which wifi adapter works fine with raspberry pi 3. The internal wifi on my raspberry is having wifi freeze problem. Thank you. If your current power supply is not strong enough to reliably power the built-in WiFi, I doubt reliabili...

ejolson

"Native" standard memcpy : 1027.1 MB/s (0.5%) armv7/armhf-ubuntu standard memcpy : 611.3 MB/s (0.4%) This seems like a huge penalty, since none of the other benchmarks showed similar performance differences. Memory bandwidth measurements can be sensitive to the order in which pages of virtual memor...

ejolson

In the modern world the issue of portability is solved by: a) Do the hard part on servers in the "cloud". b) Do the GUI part in the web browser. Clouds solve copy protection and licensing issues without needing to run any kind of DRM or trusted compute platform. Since all clouds are different as ar...

ejolson

Thank you for that write up! I never got back to the emulated pdp 11 - this might spur me on. Something to do on one of these cold Minnesota days... You're welcome! There is a lot of low-hanging fruit in historic Unix R7 that can be reached with minor coding efforts. While some would claim these ef...

ejolson

So, I just recently upgraded to Raspbian with PIXEL on my Pi 2, and The menu bar wasn't working so I entered the debug code given on the blog. And the menu bar still isn't here. What do I do? :? :? :? Since you mention upgrading, it seems likely that there is an old configuration file in your home ...

ejolson

In the last year I have seen the following played out a number of times: 1. A new forum member makes his or her first post. 2. The post says something like "if the wonderful Pi also had wonderful feature X, then I could do Y with it" or asks the similar question "will feature X ever be available, b...

ejolson

As others have said the WM draws the window boarders, controls, etc. In another sense the window manager is a user level application that communicates with the X server in the same way as Firefox, LibreOffice, Geany and other X-client applications. By default the xinit program will start the X serv...

ejolson

Let me guess: 1. Mostly copy from another language and then give your "new" language a different name. 2. Mix bits from several languages together taking this way of doing this thing and that way of doing that thing, call it a new language. 3. Use left hand whitespace to define structure, call it "...

ejolson

I first developed this system in the 1980's and I used dynamic keys that were 64k long that were layered so you never knew how many keys had been used, wow you have no idea of the files I lost forever because one char was in the wrong place or I got one layer wrong, I lost whole disks of stuff test...

ejolson

Although this is an old thread, it is what came up when searching for read only root filesystems on Raspbian. There is another way which uses overlayfs that allows a read only root to appear writable to the applications running. Thus, there is no need to consider the details which programs write to ...

ejolson

I'v made visual system on raspberry that i want sell for small companies, but im afraid that somebody would copy sd card and run it on every raspberry bought via internet. Quoting from Wikipedia that in turn quotes Bruce Schneier Against the average user, anything works; there's no need for complex...

ejolson

hostingnuggets wrote:Fantastic, I got ZFS 0.7.0 running on Raspbian

How many drives are in the storage pool and what sizes? How well does it work?

ejolson

Thanks guys I've done some more research and a cluster is just a bit :lol: out of my price range. All though I have never heard of Ray tracing and that sounds fun to attempt :( Clustering Raspberry Pi computers seldom results in something interesting from a performance point of view. However, clust...

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Re: Solution to X-Toolkit and portability.

Re: Solution to X-Toolkit and portability.

Re: Which web broswer

Re: Solution to X-Toolkit and portability.

Re: Solution to X-Toolkit and portability.

Re: Old BCM2836 RPi 2?

Re: Historic Unix R7 using SIMH

Re: Solution to X-Toolkit and portability.

Re: USB "gadget" or "device" mode in PI 3, not Zero

Re: root initramfs shell vuln

Re: It's possible connect a Raspberry Pi Zero to Raspberry P

Re: Trying to avoid OS corruption with custom partitioning

Re: Wifi Adapter for Raspberry Pi 3.

Re: Low memcpy performance inside docker containers

Re: Solution to X-Toolkit and portability.

Re: Historic Unix R7 using SIMH

Re: Menu bar missing

Re: Welcoming to new members

Re: Window manager vs desktop?

Re: How to succeed in language design without really trying

Re: Bond RPi with Linux on SD card e.g. via MAC

Re: How to make Raspbian read only?

Re: Bond RPi with Linux on SD card e.g. via MAC

Re: ZFS package on Raspbian

Re: Raspberry pi cluster