Join devRant
Do all the things like
++ or -- rants, post your own rants, comment on others' rants and build your customized dev avatar
Sign Up
Pipeless API
From the creators of devRant, Pipeless lets you power real-time personalized recommendations and activity feeds using a simple API
Learn More
Search - "no synchronization"
-
ALWAYS read warnings guys.
Story time !
A client of ours has a synchronization app (we wrote it) between his inhouse DB and our app. (No, no APIs on their end. It’s a schelduled task).
Because we didn’t want to ask them for logs every single time, the app writes logs to disk (normal) and in Applications Insights in Azure.
When needed, I can go in portal, get all logs for last execution in a nice CSV file.
Well, recently we added more logs (Some problems were impossible to track).
So client calls us : “problem with XXX”
Me : Goes to Azure, does the same manipulation as always. Dismiss a smaaaaaalish warning without reading. Study logs. Conclusion: “The XXX is not even in the logs, check your DB”.
Little I knew, the warning was telling me “Results are truncated at 10.000 lines”.
So client was right, I was wrong and I needed to develop a small app to get logs with more than 10.000 lines. (It’s per execution. Every 3 hours) -
Most successful? Well, this one kinda is...
So I just started working at the company and my manager has a project for me. There are almost no requirements except:
- I want a wireless device that I can put in a box
- I want to be able to know where that device is with enough accuracy to be able to determine in which box the device was put in if multiple boxes were standing together
So, I had to make a real time localization system. RTLS.
A solo project.
Ok, first a lot of experiments. What will the localization technique be? Which radio are we going to use?
How will the communication be structured?
After about two months I had tested a lot, but hadn't found THE solution. So I convinced my manager to try out UWB radio with Time Difference Of Arrival as localization technique. This couldn't be thrown together quickly because it needed more setup.
Two months later I had a working proof of concept. It had a lot of problems because we needed to distribute a clock signal because the radio listeners needed to be sub-nanosecond synchronous to achieve the accuracy my manager wanted. That clock signal wasn't great we later found out.
The results were good enough to continue to work on a prototype.
This time all wired communication would be over ethernet and we'd use PTP to synchronize the time.
Lockdown started.
There was a lot of trouble with getting the radio chip to work on the prototype, ethernet was tricky and the PTP turned out to be not accurate enough. A lot of dev work went into getting everything right.
A year and 5 hardware revisions later I had something that worked pretty well!
All time synchronization was done hybridly on the anchors and server where the best path to the time master was dynamically found.
Everything was synchronized to the subnanosecond. In my bedroom where I had my test setup I achieved an accuracy of about 30cm in 3d. This was awesome!
It was time to order the actual prototype and start testing it for real in one of the factory halls.
The order was made for 40 anchors and an appointment was made for the installation in the hall.
Suddenly my manager is fired.
Oh...
Ehh... That sucks. Well, let's just continue.
The hardware arrives and I prepare everything. Everything is ready and I'm pretty nervous. I've put all my expertise in this project. This is gonna make my career at this company.
Two weeks before the installation was to take place, not even a month after my manager was fired, I hear that my project was shelved.
...
...
Fuck
"We're not prioritizing this project right now" they said.
...
It would've been so great! And they took it away.
Including my salary and hardware dev cost, this project so far has cost them over €120k and they just shelved it.
I was put on other projects and they did try to find me something that suited me.
But I felt so betrayed and the projects we're not to my liking, so after another 2-3 months I quit and went to my current job.
It would've so nice and they ruined it.
Everything was made with Rust. Tags, anchors, RTLS server, web server & web frontend.
So yeah, sorry for the rambling.5 -
/** Null until this web socket is connected. Used for writes, pings, and close timeouts. */
private ScheduledExecutorService executor;
Dear boys and girls.
If you ever do this again and release this as a public library (even better - an official client of your solution, e.g. kuber-fucking-netes), I will get my way into dR's gateway servers, trace down your IP in nginx's logs, find your location, probably use some means to get your first and last name (you prolly have a domain registered under your IP anyways...), buy a ticket to your town, get to your home and wait for night to fall. Once it's dark and you're asleep, I'll make sure to leave a real nice, warm and extraordinarily smelly turd on your doorstep (I'll also make sure the process of manufacturing that gem is as noisy as it gets - you just have to bend the right way, and....).
Gents. If you really, REALLY want to make writes asynchronous, at least provide a way to either get a notification once the write is synchronized, or allow the user to handle the threads/executors himself!
https://youtube.com/watch/...5 -
Cause there's no really safe solution for that right now, finally release my favorite and verifiable secure linux password management tool for the web and as apps for iOS, Android and Windows Phone - including online synchronization, so you can access your passwords anywhere. (Web and Android first, the other platforms later).
At the moment it is still a pure gpg based Linux terminal application.2 -
Holy shit.
This was an effort to combine Gitlab, Github and Bitbucket with VSCode and git SSH authentication. SSH agent doesn't work, configured, added some code in .bashrc, seems fine. Then there was still ssh-askpass missing.
"ssh_askpass: exec(/usr/bin/ssh-askpass): No such file or directory"
WTF VSCode? Why do I need this crap?
However, installed it. Nevertheless, I'm still asked for my password every time when I synchronize using the GUI. Thank God everything was in docker containers/images. So at least there is no garbage left after every failed attempt.
I don't know how, but I finally made it that at least synchronization using the terminal works without a password.
Took me five hours to do this shit.
Now I just report the bug to Microsoft and then straight to McDonalds. I'm starving.1 -
Does anyone know a good todo app? I' searching someting _simple_, so no kanban board whatsoever.
I only want a way to do simple lists.
I'm looking for a mobile app, if it has cloud synchronization or even a desktop app, that's an absolute bonus. Also, while we're on that topic, self hosted would be reeeeaaaally cool (but again no must)6 -
I'm in a big fat fucking stinking rut, as in progress on this project has absolutely stagnanted.
Gonna rubber face your duck now **UNZIPS** excepts I don't have zippers, as joggers are the one true way; fake Adidas til I fucking drop.
Brain damage aside, I understand both how I've layed out the data and what I'm supposed to do with it. We have a virtual machine, an array of instructions and arguments for a given process within it, and we need to walk this array and map values to registers.
We also need to spill values inside registers to stack, IF they are required at a further point within that block. This also isn't terribly complex. We simply look forward in the array and see if the value is an argument to any instruction that *needs* this value to be loaded (ie, within a register).
So this implies multiple iterations; we need to better understand how one particular value is used throughout an F before we can make a final decision on how many registers and stack space are actually needed for the whole block.
Here's where it gets tricky. If there's a call, we need to be certain that the symbol being invoked has already been fully processed. Besides the obvious fact that recursion fucks me up, there's another matter: say a private method gets invoked by another private method. We can take advantage of this, by which I mean, sacrilege incoming so put on this toga.
Looking at the output for C compilers, it would seem this is not done in practice, I would assume because it's a pain in the ass. But when you have the guarantee that F will only be called internally, as that's what "private" means, there's two ways it can go:
0. It's well below the 13-20 cycle threshold, so you inline the fucker. No suprises there.
1. It's a more involved affaire, and invoked in more than one place, so you don't inline it. Codesize matters.
Recursion and [1] are the big deal things holding me back. Not because it's too hard, like I said this is kindergarten level abstraction. I'm just slow and fanatical, which is how I prefer to spell "constant obsessive paranoid delusions". I can see the potential optimization I can pull here, so I'm stuck trying to figure it out.
Idea would be, handling the register allocation and stack spill for an internal-internal (or deep internal; what we like to call a "guts" method) in synchronization with the *calling* processes. This is, fundamentally, violating all conventions -- but so under the hood no one will notice.
Let me give you an example. If we were to pass some value to a function, expecting to mutate it and get a different value back, in a lot of cases it'd be stupid to make an implicit copy by using two registers, one for input and another for the output. Dude, it's one cycle. Multiply it by a million, say sixty times per second, for every time you __needlessly__ make a copy of a value that we've already stated is mutable.
Clearly unacceptable. This is, in the strictest sense, everywhere in every single codebase. Premature micro optimization is the root of all goodness, God is great and praiseworthy. So how do we go about it?
Answer is I know and I don't know. By which I mean to say, this very thing I've done by hand. Assembly is fun. Now the issue is teaching a calculator how to do it. Not so fun.
There is a dependency chain between processes, as I believe I've kind of alluded to. I'm trying to make decisions on the side of the caller depending on the details of the callee, which is why recursion is rawdogging my soul. This is the same situation, it's inverting the direction of one or more links in the dependency chain, which makes no fucking sense.
And yet it does.
Brain, explain yourself.
How do *you* handle this without crashing?
Brain?
<<ME STEWPED; BEEP-BOOP>>
Alright then, that was a useless attempt at fuckery. Let's have a nap then, maybe it'll come to me in the morning. That's what I've been saying to myself for almost a month now.
Perhaps it is a hardcoded fuk.1