platter | A simple utility to serve you files on a platter | Runtime Evironment library
kandi X-RAY | platter Summary
kandi X-RAY | platter Summary
A simple utility to serve you files on a platter. platter works on both desktop and web, and returns a byte buffer of the file's contents. On desktop, load_file is backed by native file system APIs. On web, it is backed by an HTTP 'GET' request.
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QUESTION
I'm trying to improve performance of a git repository that is being used almost exclusively by me to version a scientific computing project. The project's simulation software blasts teeny (less than 100KB) plaintext files into fairly deep directories, representing separate, relatively economical simulation results. I point out that these are economical to indicate that I can create many thousands of them over the course of a short amount of time, which means this is just going to keep getting worse. These simulations are run as batches, which can mean that individual commits can include several hundred MB of data, all in the form of these deep sub-trees populated with teeny text files. The institutional computing cluster I am running this on uses a 33TB RAID6 array of platter drives to store all my group's data (if it matters, this drive doesn't have a ton of headroom by percentage at the moment--about 1.6 TB).
I'm reasonably sure this is bad performance on the RAID6 array's part, because when I run a top-level git add . it can take tens of minutes, even if only a few files have changed. Committing is just as bad. Pushing, once things are committed usually still takes minutes, but is a bit faster (and the slow part of the push is not the part where it sends the data over the network). Doing all of this in an interactive session where I've requested extra cores also speeds things up, but it can still take minutes to finish adding new simulation results. When I do the same on my laptop, which has a modern NVME-PCIE SSD in it, these operations take seconds.
So, any advice? I looked at git lfs, but am not convinced this would help me a ton because the pointers it would create are not a million times smaller than the files they'd be pointing to, which is the normal use case. If people still think it'd help I guess I can give that a try. Also, if it matters, the cluster's linux is old (of course) so: git version 1.8.3.1...
Happy to add more context if needed. EDIT git count-objects -vH returns:
ANSWER
Answered 2021-Apr-02 at 02:41As @CodeCaster pointed out, the git on my cluster was indeed ancient and this was in part the source of the problem. I'm not totally convinced that the raid array on my school's cluster isn't just slow somehow, but after updating to a more recent git my pulls, pushes, adds and commits have all become far less painful. They've gone from taking tens of minutes to a handful of seconds (which is more the speed I'm used to).
For what it's worth, this SO answer is what convinced me to try to upgrade git (again, thanks @CodeCaster). As @torek has pointed out, the repos are backwards compatible, so there have been no issues handling my repo that was being handled by a git from 2015 with a git from this year.
If anyone reading this concludes that it would be annoying for them to pursue this solution because they don't have root on their shared infrastructure, my approach was to use conda to install a different git in the conda environment I was working with anyway. As of this post conda install -c conda-forge git in a clean miniconda3 env will get you git 2.30.2, which is plenty current. The most recent performance update mentioned in the other SO post is in version 2.24. I suppose there are other avenues to a local git installation, but in a scientific computing environment where there's usually a local conda available for a user without too much trouble this seemed like the easiest path to a newer version.
QUESTION
I am running a SQL query and need to pull a machine name out of the field. The results have multiple entries separated by semicolons. I only care about the value for Server=PCName\SQL_Instance. The values I'm working with look like...
...ANSWER
Answered 2021-Jan-24 at 01:29You can use StartsWith("Server") to filter out the required object, then throw in another split on "=" and "/", probably easier with RegEx, but I like splits e.g.:
QUESTION
I have data stored in a VARIANT datatype SnowFlake table.
A row looks like
...ANSWER
Answered 2020-Nov-24 at 01:13To iterate through the nodes to find one with the '@key'='instructions', you will need to lateral flatten:
QUESTION
I'm building an application which takes in inputs as strings and passes them to another class where my methods are stored to return as int/numbers. In my main GUI window I am able to display this to a textArea. I create another class that opens a new window when a button is clicked. I can get the method to display it, but am unable to have anything the user entered passed unless the new window is open first then I press another button for the result.
Ideally, what I want to happen is that when I press my 'Submit Pop' button, the new window opens and displays the result.
GUI class
...ANSWER
Answered 2020-Aug-15 at 06:07You passed all kinds of data into the newScreen method of the pw class. But you didn't do anything with any of it. Worse yet, with your current design, there's really nothing useful you can do with it, because the declarations of all your GUI components are hidden inside the initialize method, where newScreen cannot get at them.
First thing you need to do is pull the declarations of your GUI components out of initialize and into member variables at the top level of the pw class, where other class members (such as the newScreen(...) method) can access them:
QUESTION
I'm trying to set a variable def, to have the value of definition inside of the Definition Class Here is the class I'm trying to reference.
...ANSWER
Answered 2020-Aug-11 at 12:55As far as I understand, you build a word guessing game. You get the definition of a word from an external API and want to get the first definition that needs to be assigned to def.
Since definitions is a List, use the indexer to get the first item.
QUESTION
I am learning Haskell, and as a task for myself I was trying to implement a Universal Machine from ICFP Contest 2006. I came up with a code, which, at a first glance, seems to be working. However, when I try to execute any application for that Universal Machine provided on the contest's website (e.g. sandmark.umz), my implementation is too slow to actually run anything. Self-check did not finish in a couple of hours, and I had to kill the process. So, I am clearly doing something wrong, I just don't know what.
I have tried to use Haskell's profiler, but I couldn't make any sense out of those numbers as well. Garbage collection doesn't seem to be taking a lot of time (3 seconds out of 173 seconds of a sample). However, total allocated memory during those 173 seconds was almost 6 GB, while the maximum heap size was 13 MB.
Could you help me understand, what is wrong with my code? I know that the amount of code is quite large, but I am not sure how to come up with a minimum reproducible example in my case, when I don't really know what is relevant, and what is not. Thank you.
...ANSWER
Answered 2020-Jul-23 at 21:04Total allocation of 3 gigabytes for a Haskell programming running for 176 seconds is miniscule. Most Haskell programs allocate 3-6 gigabytes per second for their entire runtime. In your case, much of the program is running in tight, allocation-free loops (generally a good thing when you're trying to write a fast program), which may explain the small amount of allocation. The small proportion of time spent garbage collecting is also a good sign.
I tested your program on sandmark.umz andcodex.umz, built with -O2 and no profiling.
I believe the main problem is that the hPutStrLn logging lines are generating tons of output, so your universal machine is spending all its time writing logs.
Comment out all the hPutStrLn lines, and SANDmark prints a line every few seconds. I have no idea how fast it's supposed to be, but it's certainly running.
For Codex, it completes the self-check succeeded in a few seconds and accepts a 32-character key. If you enter the wrong key, it prints "wrong key". If you enter the right key, it prints "decrypting..." At this point, it seems to freeze up, so I suspect your implementation is too slow, but not nearly as slow as you were reporting.
Note that you may find it helpful to turn off buffering on stdin and stdout at the start of main:
QUESTION
My goal is to create buttons the green box is shown. This green box is
...ANSWER
Answered 2020-Jul-09 at 23:00Couple things...
You have several mistakes in the way you are creating your buttons. Also, if you're adding them to a stack view, don't bother setting their frames (that will be overridden by the stack view anyway).
You might be better off using multiple sections for your table view.
The buttons will be too wide to fit, so you probably want to put the stack view into a scroll view.
Anyway, it's not clear how you're parsing and storing your data, so I just mocked up an example. This assumes you have your green @IBOutlet weak var categoryView: UIView! already setup:
QUESTION
I have been making changes to my models and adding new ones (many times). But now when I ran python3 manage.py makemigrations, I suddenly got this error:
django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet.
I deleted all migrations and the sqlite database file to start from scratch, but I get the same error again. All my models are registered in admin.py.
I'm using Django 2.0.3.
Can someone help me with this?
Here is the full traceback:
...ANSWER
Answered 2020-May-07 at 12:08Your issue is here in PizzaOrder:
QUESTION
I am working on a restaurant app (and new to Django/Python). I want to have a parent class Dish that will contain some counter or ID that increments for every instance of a child class of Dish. The instances are dishes like Pizza, Pasta, etc with different characteristics and relations. I'm trying to make Dish concrete, because in that case I reckon I just access Dish's PK and that will give each menu-item a Dish-ID.
However, I don't know how to correctly fix the errors I come across: You are trying to add a non-nullable field 'pasta_ptr'.
Here are the relevant code snippets:
...ANSWER
Answered 2020-Apr-01 at 06:54If you wanted to inherit from Dish() but not have it in the database, you could do this: Django abstract base class docs
QUESTION
ANSWER
Answered 2020-Mar-18 at 21:12We can do a group by n() and then reshape to 'wide' format
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