Curl Get Download !!TOP!! Speed
Remona Lostetter
curl has a -w, --write-out option that should be able to provide you with the average download speed. See man curl for details (it says: speed_download The average download speed that curl measured for the complete download. Bytes per second.)
but it seems to be sent to error output, even though the transfer has been successful and the return code from curl is zero. Why does it do this? Is there a way to suppress this without suppressing actual error messages? Adding -s or -sS to the curl command doesn't seem to alter this behaviour.
The best speed up I've ever had was reusing the same curl handle. Replace $ch = curl_init( $json_url ); with curl_setopt($ch, CURLOPT_URL, $url);. Then outside the functions have one $ch = curl_init();. You'll need to make $ch global in the functions to access it.
I needed to process about 1 million entities every day from one API-server that limits us to use only one concurrent connection. I created that class. I hope it will help others in optimising their curl requests.
With respect to environment, I've observed in PHP that cURL typically runs very fast in most environments except in places where there is low CPU and there is slower network performance. For example, on localhost on my MAMP installation, curl is fast, on a larger amazon instance, curl is fast. But on a small crappy hosting, i've seen it have performance issues where it is noticeably slower to connect. Though, i'm not sure exactly why that is slower. Also, it sure wasn't 5 seconds slower.
to help determine if its PHP or your environment, you should try interacting with curl via the command line. At least that you'll be able to rule out PHP code being the problem if its still 5 seconds.
This will force curl to use only ipv-4 and ignore ipv-6 which is still not very compatible with some devices and slows down the process. Adding --ipv4 to my curl command reduced the cost from 8 seconds to 4 seconds. Which is %50 faster.
As you can see, the overhang on the side behind the nozzle curves up, while the front overhang (which is identical) doesn't.
If you print the long (snake coil) version, you will see the curling happening more on the right side of the printer, and less on the left, and more on the back side of the print, than at the front.
I can get the snake to print, If I reduce the printing speed to 50% (during print, reduce speed with the dial on the printer)
I tied various other things, like higher and lower filament and bed temperatures. 100% fan speed, reducing extrusion modifier, etc.
Could someone try to print the Snake_coil.stl from above link in PLA, and tell me if they can get it to print with default settings? Its no a very long print, and the curling shows up at about 30% into the print, maybe 30-40 minutes at default 0.2mm.
Now, I can confirm that minimum layer time / slow down helps when you run into inefficient cooling problems - which seems at least in part responsible for curling as well. But in the end, what worked consistently for me personally with PLA curling was layer height and 100% fan speed. Sometimes thicker layers, sometimes (with steep overhangs) smaller layers. And some PLA tends to curl more than others.
So I recently ran into this same problem, and Peter has it right, though a typo makes it a bit unclear :). (Cool vs curl).
Moderator edit: the post containing this error has now been corrected. Thanks metacollin! Peter
I've been trying to address this same issue since I first built my MK3. I can get relatively good results with 0.15mm layer heights. Below that, the corners start to curl up if they are at an overhang or when they are a sharp turn like the OP mentioned. I have literally tried everything beneath the sun with settings in slicer, but to no avail. I have been trying to print the 'Treefrog' with layer height 0.1mm, 0.09mm, 0.08mm, 0.07mm , 0.06mm or 0.05mm, but with every PLA or ABS or PETG or whatever fancy co-polymer, the corners and overhangs always curled up. I have a whole army of frog legs and bellies, the front legs are always curled and rippled badly and the belly is always scuffed, no matter what heat or speed or cooling or tricks. I tried the E3D silicone nozzle sleeve, also not much difference.
I hope this information might help a lonesome PLA curling warrior out there on his endless battle. For me, the airbrush nozzle has now allowed me to print at any layer height, with any PLA with any temperature, without any curling on sharp corners or overhangs!
Well I'm using a Ender 3 so i don't know if this is going to help you. I have the same issue with the curling on overhang and if it does have to do with insufficient cooling maybe this will work, I don't know if something like this exist for a Prusa but this could be a solution
I should mention that minus this curling problem my prints are otherwise perfect. No first layer issues, no other quality issues, so I don't think the problem is something related to poor calibration.
This is a fairly simple trick to check download speeds using the official SpeedTest servers, making it a quick and effect means to check an active internet connection. There are two ways to use this, one utilizing curl, the other uses wget.
The first trick is to use curl, which is able to download remote files from just about anywhere, retrieve headers, and perform tons of other nifty actions. Curl is bundled with every version of Unix and OS X ever made which makes this a nearly universal command to test download speeds on just about any unix-based computer:
This uses the same SpeedTest servers that are available to mobile users through the Speed Test app, it can make for a decent way to directly compare connection speeds on a broadband connection vs cellular, without having to access the SpeedTest Flash-based web apps, and without having to compile any additional command line software.
DO- Use high heat and a LOW setting. A lower setting enables the air flow to be controlled and localized. The less your curls move during the diffusing process the fewer frizzes you will end up with. This is essentially the goal we are trying to attain when diffusing curls.
When making individual requests using a tool like curl or postman, it's not unusual for these to negotiate a new SSL connection for each request. The handshake process for SSL involves at least 3 network round trips (plus some processing time) meaning that the first request over SSL is often significantly slower than for subsequent request that reuse the connection.
Hold your horses. Changing the timeout speed is probably not the problem. The problem is that you can't connect to the site. It doesn't matter how long you set the timer before giving up if you can't connect, period.
curl (short for "Client URL") is a command line tool that enables data transfer over various network protocols. It communicates with a web or application server by specifying a relevant URL and the data that need to be sent or received.
curl is powered by libcurl, a portable client-side URL transfer library. You can use it directly on the command line or include it in a script. The most common use cases for curl are:
curl accepts a wide array of options, which makes it an extremely versatile command. Options start with one or two dashes. If they do not require additional values, the single-dash options can be written together. For example, the command that utilizes the -O, -L, and -v options can be written as:
I'm sure someone in the comments will tell me exactly which obscure setting I needed to turn on to make scp work at the same speed as wget. But this was a quick way to transfer a bunch of large files with the minimum of fuss.
In theory, uftp could help you reach the absolute maximum speed your LAN could handle (no TCP ACKs!), but that would probably need a bet careful hand-tuning of the speed of transfer. (uftp can afford to avoid the slow start part of the TCP algorithm.)
In practice, the could be due to rsync and scp being careful and calling fsync() every now and then, while plain wget/curl has no need to do that and relies on the OS to flush its buffers when it's comfortable. But I'm not sure at all that's the case here.
Clicking on the Validate button will generate the curl command used to identify the bug. This curl command will have the correct HTTP verb, headers and data fields to recreate the potential attack. By running this curl command in debug mode in your IDE, you can step through the requests to identify where the bug lives in code. With this, you can quickly fix the vulnerability and get back to building software.
At StackHawk, we aim to empower developers to own their application security through knowledge and tooling, like the ability to recreate a curl attack from within our platform. Using this knowledge, you can protect your input fields, write tests against malicious data requests and have the peace of mind knowing how your web application can be attacked.
So, is it better to do bicep curls fast or slow? Compared to faster repetitions, there is always a place in programming for slow bicep curls, as they can put the biceps under stress for a longer duration, which can ultimately lead to more effective bicep gains.
Fast bicep curls can place very limited stress on the bicep muscles, because we are achieving high velocity contractions, which are very limiting when it comes to time under tension. This can be beneficial however if we are trying to get either a lot of volume in or trying to improve bicep power output.
If you are limited on time, doing bicep curls at a fast rate can be an effective option for implementing a greater amount of repetitions with less time into your training. Volume can be a main driver for bicep size and strength gains.
Novices and intermediate gym goers can struggle with achieving technical proficiency with bicep curls. Slowing bicep curls down can be an effective teaching method which can result in long term results.
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