Posted by jpluimers on 2019/01/08
[WayBack] Delphi sorcery: Loop wars – measuring performance – already showing some nice optimisations that should have been in the RTL into the first place, – sprouted into a nice discussion at [WayBack] Since there was this offtopic argument going on about performance of for-in versus for-to. – Stefan Glienke – Google+ with some relatively straightforward forand for ... in loop compiler optimizations that could be done, but we have dreamt of for like the last decade or two.
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2019/01/08
I run most of my Raspberry Pi systems headless, so I was a bit surprised that OpenSuSE tumbleweed on a Raspberry Pi 3B didn’t show anything on my HDMI monitor after I installed KDE after it switches away from text-mode boot output.
[WayBack] HCL:Raspberry Pi3 – openSUSE suggests to
I see HDMI output in U-Boot, but not in Linux
The upstream Linux graphics driver for the Raspberry Pi has problems with a few monitors. The same applies to the 7″ LCD displays. In those cases, please fall back to the efi frame buffer console by passing the following into the kernel command line:
modprobe.blacklist=vc4
However, it does not explain how to modify that “the kernel command line”.
Searching for obvious ways via “Raspberry Tumbleweed Kernel Command Line” got me to for instance
which all suggest editing /boot/cmdline.txt, however that file does not exist:
# ls -al /boot total 34624 drwxr-xr-x 6 root root 4096 Jul 23 21:05 . drwxr-xr-x 24 root root 4096 Jul 16 02:02 .. -rw-r--r-- 1 root root 65 Jul 16 12:42 .Image-4.4.76-7-default.hmac -rw-r--r-- 1 root root 0 Jul 16 16:56 0x75b762d5 lrwxrwxrwx 1 root root 22 Jul 16 16:34 Image -> Image-4.4.76-7-default -rw-r--r-- 1 root root 14878208 Jul 16 12:20 Image-4.4.76-7-default -rw-r--r-- 1 root root 3217519 Jul 16 12:20 System.map-4.4.76-7-default lrwxrwxrwx 1 root root 1 Jul 16 02:00 boot -> . -rw-r--r-- 1 root root 1725 May 24 20:11 boot.readme -rw-r--r-- 1 root root 2405 Jul 16 16:56 boot.scr -rw-r--r-- 1 root root 2333 Jul 16 16:56 boot.script -rw-r--r-- 1 root root 152522 Jul 16 08:39 config-4.4.76-7-default lrwxrwxrwx 1 root root 12 Jul 23 16:13 dtb -> dtb-4.11.6-1 drwxr-xr-x 3 root root 4096 Jul 23 16:13 dtb-4.11.6-1 drwxr-xr-x 5 root root 16384 Jan 1 1970 efi drwxr-xr-x 7 root root 4096 Jul 24 18:27 grub2 lrwxrwxrwx 1 root root 23 Jul 16 16:34 initrd -> initrd-4.4.76-7-default -rw------- 1 root root 8080932 Jul 23 21:05 initrd-4.4.76-7-default -rw-r--r-- 1 root root 288571 Jul 16 12:42 symvers-4.4.76-7-default.gz -rw-r--r-- 1 root root 377 Jul 16 12:42 sysctl.conf-4.4.76-7-default -rw-r--r-- 1 root root 1484762 Jul 16 16:56 unicode.pf2 drwxr-xr-x 2 root root 4096 Jul 24 09:05 vc -rw-r--r-- 1 root root 7282031 Jul 15 07:00 vmlinux-4.4.76-7-default.gz
There are other config.txt files:
# find / | grep config.txt
/boot/efi/config.txt
/boot/vc/config.txt
However, these seems to be unclear which of the two is actually used and what options can be set at all: [WayBack] Raspberry Pi • View topic – aarch64 on Pi3.
So the quest continues, as a lot of settings can be applied in these files:
I’ve temporarily given up on the /boot/config.txt editing, but continued searching for “modprobe.blacklist=vc4”, which lead to a few interesting results:
All of those suggest adding modprobe.blacklist=vc4 to the grub configuration. The second post actually has the most elaborate steps for this, which I’ve paraphrased into:
root, edit /etc/default/grub (make a backup first)GRUB_CMDLINE_LINUXmodprobe.blacklist=vc4to the end of the variable initialisation (ensure there is a space before it and you keep the terminating double-quote)grub2-mkconfig > /boot/grub2/grub.cfgThis solved my problem: no text output on HDMI.
Note that in order to get graphical output, you need to install any of the non-JeOS images. Installing just kde+kdm and dependencies isn’t enough to get the X server going.
–jeroen
Posted in Development, Hardware Development, Raspberry Pi | Leave a Comment »
Posted by jpluimers on 2019/01/08
There was a nice discussion on [WayBack] What RDBMS do you use when doing location-aware things?More specifically, I am looking into a simple app with use of GPS… – Andrea Raimondi – Google+
TL;DR: use PostGIS on top of PostgresSQL.
–jeroen
Posted in Database Development, Development, PostGIS | Leave a Comment »
Posted by jpluimers on 2019/01/07
Für mein Archiv: Zur Amazon chat geht via AmazonSmile – Kontaktieren Sie uns.
–jeroen
https://smile.amazon.de/gp/help/contact-us/general-questions.html/
Posted in LifeHacker, Power User | Leave a Comment »
Posted by jpluimers on 2019/01/07
A while ago, I write about Locally Administered Addresses: a few series of MAC addresses you can use on your local network: MAC address ranges safe for testing purposes (Locally Administered Address).
A while ago, I found ones in my network and ones in my WiFi SSID survey starting with FA:8F:CA. They did not show up in the Wireshark · OUI Lookup Tool nor their manufacturer database.
But with bit 7 turned off they start with F8:8F:CA which does show up as “F8:8F:CA Google, Inc.”
They appear to be Google devices, in my case Google ChromeCast ones, though they can also be Google Home ones.
Google does “magic” with networks, just look at a few of the links here:
–jeroen
Posted in Ethernet, Google, Internet, Network-and-equipment, Power User, Ubiquiti, WiFi | Leave a Comment »
Posted by jpluimers on 2019/01/07
A few notes on Zabbix triggers and web scenarios:
For now I’ve set these kinds of triggers on response times:
Warning: 2 minute of response time > averageAverage: 5 minutes of response time > 2*averageHigh: 10 minutes of response time > 4*avarageDisaster: 30 minutes of response time > 10*averageThese are the colours by default used for the trigger levels: at http://example.org/zabbix/adm.triggerseverities.php
Default Zabbix trigger severities and their colours.
–jeroen
Posted in *nix, Monitoring, Power User, Zabbix | Leave a Comment »
Posted by jpluimers on 2019/01/07
After an outrage about AdWare mid last year on the Windows side of things, a new outrage on the Mac side of things at the end of last year caused FileZilla to be removed from the homebrew cask repository.
They do not care that there is a non-bundle version that (right now) does not have adware, as FileZilla could put AdWare in that version at any moment in time.
After trying to update, it will disappear, and you might get an error like this (a full log is below the fold):
"Error: Cask 'filezilla' is unavailable: No Cask with this name exists."
Too bad, as FileZilla was fun while it lasted.
For the dare devils, you might want to try the non-bundled version at fosshub, but please run it through at least VirusTotal before installing, and remember: you have to trust yet another man-in-the-middle!
Uninstalling now that the cask has been removed is described in:
Delete
Filezilla.appin/Applications, as well as the"$(brew --prefix)/Caskroom/filezilladirectory. If you also want to delete its config files, see them on the deleted cask [Wayback].
cask 'filezilla' do version '3.38.1' sha256 '250dfd5e8f4c97bf0baf762251cc328f60b2da4a0dd1c316d67a45c1f1349cf7' url "https://download.filezilla-project.org/client/FileZilla_#{version}_macosx-x86.app.tar.bz2" appcast 'https://filezilla-project.org/versions.php?type=client' name 'FileZilla' homepage 'https://filezilla-project.org/' depends_on macos: '>= :mavericks' app 'FileZilla.app' zap trash: [ '~/Library/Application Support/com.apple.sharedfilelist/com.apple.LSSharedFileList.ApplicationRecentDocuments/de.filezilla.sfl*', '~/Library/Saved Application State/de.filezilla.savedState', '~/Library/Preferences/de.filezilla.plist', '~/.config/filezilla', ] end
Related:
–jeroen
Posted in Apple, Power User, Windows | Leave a Comment »
Posted by jpluimers on 2019/01/04
Just in case I ever run into this again: [WayBack] Lock conflict on no wait transaction
–jeroen
Posted in Database Development, Development, Firebird, Power User | Leave a Comment »
Posted by jpluimers on 2019/01/04
When you look at the “Response time” graph for a Zabbix web scenario step that fetches a URL, you’d think the unit would be milliseconds (as last/min/avg/max are all listed in milliseconds).
However an expression like this puts the trigger off the scale:
{owa.example.org:web.test.time[https OWA,https OWA returns http code 200,resp].last()}>100
This trigger however works:
{owa.example.org:web.test.time[https OWA,https OWA returns http code 200,resp].last()}>0.1
The [WayBack] web scenario step items topic indeed lists the web.test.time unit as seconds
–jeroen
Web scenario:
https OWA returns http code 200 15 sec https://example.org/owa
Trigger:
0.1″ class=”size-medium” /> {owa.example.org:web.test.time[https OWA,https OWA returns http code 200,resp].last()}>0.1
Posted in *nix, Monitoring, Power User, Zabbix | Leave a Comment »
Posted by jpluimers on 2019/01/04
Interesting: [WayBack] DBA Blog 2.0: Installing Zabbix into Azure using a MySQL PaaS
–jeroen
Posted in *nix, Azure Cloud, Cloud, Cloud Development, Development, Infrastructure, Monitoring, Power User, Software Development, Windows Azure, Zabbix | Leave a Comment »
The Wiert Corner - irregular stream of stuff 