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  • bottle.py on EC2 micro instance causes 2 order of magnitude slowdown

    - by user61633
    Cross-posted from StackOverflow: I wrote a little toy script to solve this type of game, and put it on my new micro EC2 instance. It works perfectly, but while it takes around 0.5 seconds to run a local version, and takes under 0.5 seconds to run both the local and the bottle.py version on my home computer, running the bottle.py version on the EC2 instance takes over 2 minutes. Python has the cpu pegged at 99% the entire time. Only 7.4% memory usage, consistently, and no swapping. The only guess I have is initialization time for bottle.py on EC2, but if it were that, why would it be ~200x faster on my own computer with bottle.py?

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  • debugging JBoss 100% CPU usage

    - by Nate
    We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • How do I capture and playback http web requests against multiple web servers?

    - by KevM
    My overall goal is to not interrupt a production system while capturing HTTP Posts to a web application so that I can reverse engineer the telemetry coming from a closed application. I have control over the transmitter of the HTTP Posts but not the receiving web application. It seems like I need a request "forking" proxy. Sort of a reverse proxy that pushes the request to 2 endpoints, a master and slave, only relaying the response from the master endpoint back to the requester. I am not a server geek so something like this may exist but I don't know the term of art for what I am looking for. Another possibility could be a simple logging proxy. Capture a log of the web requests. Rewrite the log to target my "slave" web application. Playback the log with curl or something. Thank you for your assistance.

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  • Can I select which folders the Photos live tile chooses from?

    - by nhinkle
    The built-in Photos app in Windows 8 has a live tile on the start screen that shows photos from your pictures library. It's a cool little visual, even if it's not particularly useful. The problem is that a lot of image files on my computer are not really photos per se -- I have a lot of screenshots, PNGs of technical drawings, graph images, etc. Those all look pretty awkward on the start screen. I look pretty awkward on the start screen too... sometimes photos like resume profile shots show up that I don't want to delete, but they're not really what I want to be staring at when I start my computer up. I'm looking for some way to configure which folders the Photos app should look in for images to display on the live tile. That way, I could point it to some directories of pretty scenic pictures I've taken, and not have to see graphs and my own mug. For the time being, I've just disabled the live tile (right click - disable live tile), but I would ultimately like to have this functionality, just with more control over it.

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  • How can I optimize my ajax calls to deliver at 60ms.

    - by Quintin Par
    I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance? Edit: People, you seemed to be angry that I did a comparison to Google and the question is very generic. Sorry about that. To rephrase: How can I bring down response time from 500 ms to 60 ms provided my server response time is just a fraction of ms. Assume the results are served from Nginx - Varnish with a cache hit. Here are some answers I would like to answer myself assume the response sizes remained more or less the same. Ensure results are http compressed Ensure SPDY if you are on https Ensure you have initcwnd set to 10 and disable slow start on linux machines. Etc. I don’t think I’ll end up with 60 ms at Google level but your collective expertise can help easily shave off a 100 ms and that’s a big win.

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  • SSL Certificate only works when session active in Server 2008

    - by CodeMonkey1
    I have a web app that uses an installed certificate to send a web request to a 3rd party web service. This has worked for a long time on Windows Server 2003, but just recently we found a problem with it on 2008 installations. When logged into the server as the same user the App Pool uses, either locally or via remote desktop, the web app and it's secure 3rd party request works fine. However, when there are no user sessions open, the 3rd party request fails, as if the certificate were not attached to the web request. Any ideas?

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  • How does Google manage to serve results so fast?

    - by Quintin Par
    I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance?

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  • Authentication and Login on 2 website

    - by xRobot
    Hi at all, I have 2 site: example.com and exampletwo.com I want that when a user login on example.com then he is automatically authenticated also on exampletwo.com How can I do that ? I use Django + Nginx on first website and Tornado framework + Tornado server on second website. Thanks ;) . P.S. If you don't know this platforms ( Django or Tornado or Nginx ), I accept also a solution for a generic PHP+Apache platform and then I will do some research :)

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  • Equivalent to Bash Alias in Powershell

    - by RightFullRudder
    Hi there, a newbie powershell question: I'd like to make an alias in powershell exactly equivalent to this Bash alias: alias django-admin-jy="jython /path/to/jython-dev/dist/bin/django-admin.py" In tinkering with it so far, I've found this to be very difficult. -Powershell Aliases only work with Powershell commands + function calls -No clear way to allow for an unlimited number of args on a powershell function call -Powershell seems to block stdout

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  • Passing local variables to Erlydtl block

    - by Justin
    Hi, I've got a block of erlydtl code which I use repeatedly and would like to abstract to some kind of block / partial template. The issue is that I need to pass the block a local variable. This is possible with Rails partial templates; it looks like it's possible with Django's blocks [albeit with some kind of Python hackery]; I'm wondering if it's possible with Erlydtl [Erlang implementation of Django templates] Ideas ? Thanks you.

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  • agility of asp.net MVC

    - by Hellnar
    Hello I am wondering how agile (fast to develop yet stable) asp.net MVC compared to frameworks using dynamic languages such as Django or Ruby on Rails. I will be happy if you share you experiance in the name of development speed (assuming each language/framework is known at a similar level) Things I love about Django Fast model design thanks to ORM Good template system Not too hard to deploy Easy to extend Lots of free apps to plugin and great documentation Thanks

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  • How can I conditionally only log something if it's a certain Class?

    - by BryanWheelock
    Something like this: if self.class == "User": logging.debug("%s non_pks were found" % (str(len(non_pks))) ) In [2]: user = User.objects.get(pk=1) In [3]: user.class Out[3]: In [4]: if user.class == 'django.contrib.auth.models.User': print "yes" ...: In [5]: user.class == 'django.contrib.auth.models.User' Out[5]: False In [6]: user.class == 'User' Out[6]: False In [7]: user.class == "" Out[7]: False

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  • mod_wsgi daemon mode vs threaded fastcgi

    - by t0ster
    Can someone explain the difference between apache mod_wsgi in daemon mode and django fastcgi in threaded mode. They both use threads for concurrency I think. Supposing that I'm using nginx as front end to apache mod_wsgi. UPDATE: I'm comparing django built in fastcgi(./manage.py method=threaded maxchildren=15) and mod_wsgi in 'daemon' mode(WSGIDaemonProcess example threads=15). They both use threads and acquire GIL, am I right?

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  • Creating form object for variable kind of form.

    - by Bunny Rabbit
    i want to create a form for users to submit questions in django ..so far the models i have created are class Question(models.Model): statement=models.CharField(max_length=100) class Choice(models.Model): statement=models.CharField(max_length=100) value=models.IntegerField() question=models.ForeignKey(Question) Now i want to write a Form class for creating a above form but the problem is the number of choices are variable,a user can decide how many choices a question must have .How do i do that in django?

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  • How can I make list or set translatable using gettext?

    - by Thomas
    I have some structure in Python: gender=( ('0','woman'), ('1','man') ) I want translate it before I will display it in Django template. Unfortunatelly below sollution don't work: from django.utils.translation import ugettext_lazy as _ gender=( ('0',('woman')), ('1',('man')) ) What I must do to translate this. I readed something in: link text but I can't understand what I should do.

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  • Default tablespace for indexes in postgres

    - by tom
    Just wondering if its possible to set a default tablespace in postgres to keep indexes. Would like the databases to live on the default tablespace for postgres, however, would like to get the indexes on a different set of disks just to keep the i/o traffic separated. It does not appear to me that it can be done without going in and doing an ALTER index TABLESPACE command, and then the index is moved and will stay there, but the databases and indexes are part of a django app, so non-django intervention can cause some problems.

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  • Non blocking IO call from Django controller from a Windows service

    - by Anders
    Hi all, I have a CherryPy server with a Django application running as a Windows service, inside a controller I need to make a call to wmic, the problem is, so far I have only been able to implement a blocking operation. Does anyone have any recommendation for a non blocking operation so, at least more then one person at a time can access this controller and extract information from wmic? Thanks in advance, Anders

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  • Python directory list returned to Django template

    - by Shu
    Total Python newb here. I have a images directory and I need to return the names and urls of those files to a django template that I can loop through for links. I know it will be the server path, but I can modify it via JS. I've tried os.walk, but I keep getting empty results.

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