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Search found 448 results on 18 pages for 'memcached'.

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• What would cause Memcached to Hang for 2+ seconds?

  - by Brad Dwyer

  I'm going nuts trying to scale memcached. From their site: Memcached operations are almost all O(1). Connecting to it and issuing a get or stat command should never lag. If connecting lags, you may be hitting the max connections limit. See ServerMaint for details on stats to monitor. If issuing commands lags, you can have a number of tuning problems. Most common are hardware problems, not enough RAM (swapping), network problems (bandwidth, dropped packets, half-duplex connections). On rare occasion OS bugs or memcached bugs can contribute. Well.. it is most certainly not performing like an O(1) operation for me. Under low to normal load on our site memcached response times for get and set ops are about 0.001 seconds. Not bad. But if we triple the load we get outliers that take 100x (or in rare cases 1000x!) that long. I even had one instance where it took 2.2442 seconds for memcached to store a value. Obviously this is killing our site. Here's the output of Memcached-getStats during one of the slow periods: [pid] => 18079 [uptime] => 8903 [threads] => 4 [time] => 1332795759 [pointer_size] => 32 [rusage_user_seconds] => 26 [rusage_user_microseconds] => 503872 [rusage_system_seconds] => 125 [rusage_system_microseconds] => 477008 [curr_items] => 42099 [total_items] => 422500 [limit_maxbytes] => 943718400 [curr_connections] => 84 [total_connections] => 4946 [connection_structures] => 178 [bytes] => 7259957 [cmd_get] => 1679091 [cmd_set] => 351809 [get_hits] => 1662048 [get_misses] => 17043 [evictions] => 0 [bytes_read] => 109388476 [bytes_written] => 3187646458 [version] => 1.4.13 So things that I have ruled out so far are: Hitting the max connections limit (curr_connections of 84 is well below the default of max of 1024) Swapping - the machine has 900M out of 1024M of memory dedicated to memcached on a dedicated machine. It only appears to be using about 7MB of data as per the bytes stat. How would I diagnose the other hardware problems? prstat doesn't really show a whole lot going on in terms of CPU or memory usage. Not sure how to figure out the network problems but as this is a dedicated server on the same private network as the web box I don't think it's a connectivity issue (ping is less than a millisecond between the boxes). Is there something else I'm missing here? It's driving me nuts. Edit: Also forgot to mention that I've tried both persistent and non-persistent connections with minimal-to-no impact.

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• What type of websites does memcached speed up

  - by Saif Bechan

  I have read this article about 400% boost of your website. This is done by a combination of nginx and memcached. The how-to part of this website is quite good, but i mis the part where it says to what types of websites this applies. I know nginx is a http engine, I need no explanation for that. I thought memcached had something to do with caching database result. However i don't understand what this has to do with the http request, can someone please explain that to me. Another question I have is for what types of websites is this used. I have a website where the important part of the website consist of data that changes often. Often being minutes. Will this method still apply to me, or should I just stick with the basic boring setup of apache and nothing else.

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• Avoiding dog-piling or thundering herd in a memcached expiration scenario

  - by Quintin Par

  I have the result of a query that is very expensive. It is the join of several tables and a map reduce job. This is cached in memcached for 15 minutes. Once the cache expires the queries are obviously run and the cache warmed again. But at the point of expiration the thundering herd problem issue can happen. One way to fix this problem, that I do right now is to run a scheduled task that kicks in the 14th minute. But somehow this looks very sub optimal to me. Another approach I like is nginx’s proxy_cache_use_stale updating; mechanism. The webserver/machine continues to deliver stale cache while a thread kicks in the moment expiration happens and updates the cache. Has someone applied this to memcached scenario though I understand this is a client side strategy? If it benefits, I use Django.

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• memcached cluster maintenance

  - by Yang

  Scaling up memcached to a cluster of shards/partitions requires either distributed routing/partition table maintenance or centralized proxying (and other stuff like detecting failures). What are the popular/typical approaches/systems here? There's software like libketama, which provides consistent hashing, but this is just a client-side library that reacts to messages about node arrivals/departures---do most users just run something like this, plus separate monitoring nodes that, on detecting failures, notify all the libketamas of the departure? I imagine something like this might be sufficient since typical use of memcached as a soft-state cache doesn't require careful attention to consistency, but I'm curious what people do.

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• Force memcached to write to all servers in pool

  - by Industrial

  Hi everyone, I have thought a bit on how to make sure that a particular key is distributed to ALL memcached servers in a pool. My current, untested solution is to make another instance of memcached, something like this: $cluster['local'] = array('host' => '192.168.1.1', 'port' => '11211', 'weight' => 50); foreach ($this->cluster() as $cluster) { @$this->tempMemcache = new Memcache; @$this->tempMemcache->connect($cluster['host'], $cluster['port']); @$this->tempMemcache->set($key, $value, $this->compress, $expireTime); @$this->tempMemcache->close(); } What is common sense to do in this case, when certain keys need to be stored on ALL servers for reliability?

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• Invalidating Memcached Keys on save() in Django

  - by Zack

  I've got a view in Django that uses memcached to cache data for the more highly trafficked views that rely on a relatively static set of data. The key word is relatively: I need invalidate the memcached key for that particular URL's data when it's changed in the database. To be as clear as possible, here's the meat an' potatoes of the view (Person is a model, cache is django.core.cache.cache): def person_detail(request, slug): if request.is_ajax(): cache_key = "%s_ABOUT_%s" % settings.SITE_PREFIX, slug # Check the cache to see if we've already got this result made. json_dict = cache.get(cache_key) # Was it a cache hit? if json_dict is None: # That's a negative Ghost Rider person = get_object_or_404(Person, display = True, slug = slug) json_dict = { 'name' : person.name, 'bio' : person.bio_html, 'image' : person.image.extra_thumbnails['large'].absolute_url, } cache.set(cache_key) # json_dict will now exist, whether it's from the cache or not response = HttpResponse() response['Content-Type'] = 'text/javascript' response.write(simpljson.dumps(json_dict)) # Make sure it's all properly formatted for JS by using simplejson return response else: # This is where the fully templated response is generated What I want to do is get at that cache_key variable in it's "unformatted" form, but I'm not sure how to do this--if it can be done at all. Just in case there's already something to do this, here's what I want to do with it (this is from the Person model's hypothetical save method) def save(self): # If this is an update, the key will be cached, otherwise it won't, let's see if we can't find me try: old_self = Person.objects.get(pk=self.id) cache_key = # Voodoo magic to get that variable old_key = cache_key.format(settings.SITE_PREFIX, old_self.slug) # Generate the key currently cached cache.delete(old_key) # Hit it with both barrels of rock salt # Turns out this doesn't already exist, let's make that first request even faster by making this cache right now except DoesNotExist: # I haven't gotten to this yet. super(Person, self).save() I'm thinking about making a view class for this sorta stuff, and having functions in it like remove_cache or generate_cache since I do this sorta stuff a lot. Would that be a better idea? If so, how would I call the views in the URLconf if they're in a class?

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• Regex on memcached key?

  - by Mickey Cheong

  Hi, Is it possible to grab a list of memcached key based on some regex? I understand that one solution is to store the key in the database and grab the list when I need to delete those keys. This means that, it is going to incur additional cost to the db. I was wondering if there is another way to do it without DB overhead. Cheers, Mickey

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• Which Python module to use for Memcached?

  - by bodacydo

  Hello folks, I am implementing caching for my Python application and I want to use memcached. Which module do you suggest me to use? There are so many that I don't know which one to choose. Thanks, Boda Cydo.

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• Using .NET, how and why to use the memcached (http://sourceforge.net/projects/memcacheddotnet/) may

  - by fredzvt

  I hear much talk about memcached, but when briefly studied on it, I couldn't understand what advantages I can take instead of using the good old Dictionary to cache my data in my applications. Can someone explain me?

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• memcached never expired in rails?

  - by pickerel

  It's very strange that the session will never expire if i use memcached store even i set config.action_controller.session :session_expires = 1.seconds.from_now And I use extended_fragment_cache to cache fragment, I meet the same problem <% Cache "my_page", {:expires = 1.minutes} do ... % never expired! Anyone know where's the problem?

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• Using memcached as a session storage with CodeIgniter

  - by Alex N.

  I am researching possibilities of using memcached as a session storage for a system built on CodeIgniter. Has anybody done this before(that's probably a stupid question :) and if so what's your experience folks? Have you used any existing libraries/extensions? As far as performance improvement what have you seen? Any caveats?

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• simpledb, sql azure, mysql + memcached

  - by sirmak

  For a new scalable high traffic global ecommerce website (asp.net) project which technology fits best (max. scalability & performance, min. price & maintenance)? amazon simpledb, microsoft sql azure, mysql + memcached combo, or your solution...

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• Rails: Using memcached on a horizontally partitioned DB

  - by ming yeow

  I am using a sharded db - horizontally partitioned. I am using the DataFabric gem from FiveRuns. What would be the implications of using memcached on this? Would it work the same as if I was using ActiveRecord?

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• Can memcached make full use of multi-core?

  - by Mickey Shine

  Is memcached capable of making full use of multi-core? Or is there any way tuning this?

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• Are there any memcached browser utilities?

  - by Fragsworth

  I'd like to be able to see what is stored on a memcached server, with the ability to add/remove values at will for development purposes. Are there any tools to help with this? I'd really like a GUI, I just can't find one.

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• Article Sharing &ndash; Windows Azure Memcached Plugin

  - by Shaun

  I just found that David Aiken, a windows azure developer and evangelist, wrote a cool article about how to use Memcached in Windows Azure through the new feature Azure Plugin. http://www.davidaiken.com/2011/01/11/windows-azure-memcached-plugin/ I think the best solution for distributed cache in Azure would be the Windows Azure AppFabric Caching but since it’s only in CTP and avaiable in the US data center David’s solution would be the best. Only one thing I’m concerning about, is the stability of windows verion Memcached.

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• Failed to save data at the server from memcached program

  - by zahir hussain

  hi i want to know why i cant store multi dimensional(array size is more than 1000) $memcache = new Memcache; $memcache->connect('localhost', 11211) or die ("Could not connect"); the above s working correctly... the below one have error... $memcache->set('key', $sear, false, 60) or die ("Failed to save data at the server"); if the $sear is string or object array then no problem for store data at the server.. but i store multi dimensional array in memcached,,i will get the error is Failed to save data at the server thanks and advance

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• NoMethodError using Memcached Sinatra-style

  - by sevennineteen

  I've just installed Memcached on my Mac and updated my Sinatra app configuration as described in Heroku's documentation, but I'm getting a NoMethodError when trying to use the hash-based syntax they specify: >> CACHE['color'] = 'blue' >> CACHE['color'] Using explicit get and set methods as below seems to work fine. >> CACHE.set('color', 'blue') >> CACHE.get('color') If necessary I can use the latter syntax, but the former seems more elegant. I haven't tested this on Heroku's environment since I'd like whatever implementation I use to work on my local environment as well. Thanks!

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• cache_money only writing to memcached on creates and updates, and seemingly never looking in the cac

  - by Shane Liebling

  I seem to be having some extremely odd cache_money interactions. When I am on the console, and I create a new instance of a class and save it I see the cache misses and cache stores on my memcached console output. Then when the create finishes I see a bunch of cache deletions. If I then try to do any kind of find for the newly created object (or any other objects for that matter) I never see any cache access. This is highly confusing. I could kind of understand if all finds never hit the cache (though that in and of itself would be an issue requiring investigation), but finds do seem to hit the cache when the object is being created (checking for associations and such). Anyone have this experience in the past at all? Any thoughts? AFAIK there isn't really much in the way of configuration options for cache_money, and it certainly doesn't seem like there are any that would be on by default and be creating these kinds of symptoms. My cache_money config is basically straight out of the docs. Any help would be greatly appreciated.

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• PHP Extension (memcache|memcached) not showing in phpinfo() but showing in php -m and php -i?

  - by Auston

  I am getting both modules listed as installed / configured when I use: php -m or if I use: php -i but when I use: $m = new Memcache; // or $m = new Memcache(); // or $m = new Memcached(); //or $m = new Memcached; I get the following error: Fatal error: Class 'Memcached' not found I am running on a Mac - OS X (10.5.7) with default install of apache & php. Additionally, I have memcached running as a daemon on 127.0.0.1:11211 and libmemcache as required by the php-memcached library. I have restarted apache tons of times and even done a machine restart. Does anyone know why the modules/extensions show up in the command line but not in my phpinfo()? I am literally stumped, after 3 hours of googling, I am just about ready to give up.

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• Memcached and Rails Fragment Caching Issue

  - by Michael Waxman

  When I have 2 views that fragment cache the same query BUT display them differently, there is only one fragment and they both display it the same way. Is there any way around this? For example... #views/posts/list - cache(@posts) do - for p in @posts = p.title #views/posts/list_with_images - cache(@posts) do - for p in @posts = p.title = p.content = image_tag(p.image_url) #controllers/posts_controller def list ... @posts = Post.all end def list_with_images ... @posts = Post.all end

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• Memcached Latency in Amazon EC2

  - by user365941

  Hi, I am planning to use Amazon EC2 host only for MemCache.My web application ll be residing on shared hosted server and will be communicating to Ec2 for querying Memcache. How would be the performance of this setup. Regards, Mugil.

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• how to delete memcached data with "filter" keys ?

  - by panchicore

  Hi, I just want to delete cached data, but I have many keys, for example: user_54_books user_54_movies user_54_comments user_54_foobar I can write $cache-delete('user_54_books'); but I have to do it with all "user_ID_objects", can I say to memcache, something like delete-('user_54_*'); ? how? thanks :)

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• Memcached extension for PHP on Windows Server

  Hello, my configuration: Windows 2008 IIS 7 PHP 5.2.10 / FastCGI Memcache as a Windows Service I tried to use the php_memcache extension for PHP but it doesn't load. This extension comes with PECL 5.2.6 Any idea? Do you know if exist a php_memcache"d" extension for PHP on Windows? BR Santiago

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• Memcached: providing TTL setting while connection creation.

  - by KandadaBoggu

  I want to set the TTL for the keys while creating the connection. Right now I am setting it while writing to the cache. Is there a configuration parameter for this?

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