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• Better performance to Query the DB or Cache small result sets?

  - by user169867

  Say I need to populate 4 or 5 dropdowns w/ items from a database. Each drop down will have < 15 items in it. These items almost never change. Now I could query the DB each time the page is accessed or I could grab the values from a custom class that would check to see if they already exist in ASP.Net's cache and only if they don't query the DB to update the cache. It's trivial for me to write but I'm unsure if the performace would be better or not. I think it would be (although not likely anything huge). What do you think?

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• What is the usage of Local Database Cache project type in Visual Studio?

  - by masoud ramezani

  What is the usage of Local Database Cache project type in Visual Studio?

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• Observer not clearing cache in Rails 2.3.2 - please help.

  - by Jason

  Hi, We are using Rails 2.3.2, Ruby 1.8 & memcache. In my Posts controller I have: cache_sweeper Company::Caching::Sweepers::PostSweeper, :only => [:save_post] I have created the following module: module Company module Caching module Sweepers class PostSweeper < ActionController::Caching::Sweeper observe Post def after_save(post) Rails.cache.delete("post_" + post.permalink) end end end end end but when the save_post method is invoked, the cache is never deleted. Just hoping someone can see what I am doing wrong here. Thanks.

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• Coherence Query Performance in Large Clusters

  - by jpurdy

  Large clusters (measured in terms of the number of storage-enabled members participating in the largest cache services) may introduce challenges when issuing queries. There is no particular cluster size threshold for this, rather a gradually increasing tendency for issues to arise. The most obvious challenges are that a client's perceived query latency will be determined by the slowest responder (more likely to be a factor in larger clusters) as well as the fact that adding additional cache servers will not increase query throughput if the query processing is not compute-bound (which would generally be the case for most indexed queries). If the data set can take advantage of the partition affinity features of Coherence, then the application can use a PartitionedFilter to target a query to a single server (using partition affinity to ensure that all data is in a single partition). If this can not be done, then avoiding an excessive number of cache server JVMs will help, as will ensuring that each cache server has sufficient CPU resources available and is also properly configured to minimize GC pauses (the most common cause of a slow-responding cache server).

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• Can a proxy server cache SSL GETs? If not, would response body encryption suffice?

  - by Damian Hickey

  Can a (||any) proxy server cache content that is requested by a client over https? As the proxy server can't see the querystring, or the http headers, I reckon they can't. I'm considering a desktop application, run by a number of people behind their companies proxy. This application may access services across the internet and I'd like to take advantage of the in-built internet caching infrastructure for 'reads'. If the caching proxy servers can't cache SSL delivered content, would simply encrypting the content of a response be a viable option? I am considering all GET requests that we wish to be cachable be requested over http with the body encrypted using asymmetric encryption, where each client has the decryption key. Anytime we wish to perform a GET that is not cachable, or a POST operation, it will be performed over SSL.

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• Does that make sense for a proxy server to cache the replies that were sent for a specific client?

  - by ertan

  Does that make sense for a proxy server to cache the replies that were sent for a specific client?

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• Basic memcached question

  - by Aadith

  I have been reading up on distributed hashing. I learnt that consistent hashing is used for distributing the keys among cache machines. I also learnt that, a key is duplicated on mutiple caches to handle failure of cache hosts. But what I have come across on memcached doesn't seem to be in alignment with all this. I read that all cache nodes are independent of each other and that if a cache goes down, requests go to DB. Theres no mention of cache miss on a host resulting in the host directing the request to another host which could either be holding the key or is nearer to the key. Can you please tell me how these two fit together? Is memcached a very preliminary form of distributed hashing which doesnt have much sophistication?

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• How Do I Rollout WP-Cache To 1000 WordPress Blogs?

  - by Volomike

  My client has 1000 WordPress blogs hosted on a server for customers. Each one is in its own domain through cpanel and SuPHP, running in CGI mode on Apache2.2. Now he wants me (I'm the PHP programmer) to get WP-Cache loaded out on each of these blogs and not just activated, but enabled. He also wants the timeout value set to 2 days instead of the default setting. I have root on LAMP. What is the preferred way to roll out an update to each blog such that on a page view, it sees if WP-Cache is enabled or not. If not, it needs to copy it out from a central source, activate it, and then enable it along with the different timeout value being used.

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• J2EE/EJB + service locator: is it safe to cache EJB Home lookup result ?

  - by Guillaume

  In a J2EE application, we are using EJB2 in weblogic. To avoid losing time building the initial context and looking up EJB Home interface, I'm considering the Service Locator Pattern. But after a few search on the web I found that event if this pattern is often recommended for the InitialContext caching, there are some negative opinion about the EJB Home caching. Questions: Is it safe to cache EJB Home lookup result ? What will happen if one my cluster node is no more working ? What will happen if I install a new version of the EJB without refreshing the service locator's cache ?

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• In Linux, how can I completely disregard the contents of /etc/ld.so.cache?

  - by BillyBBone

  Hi, For the purposes of prototyping a new set of shared libraries in a development sandbox (to which I don't have root access), I'd like to know how to execute a binary while completely overriding the contents of /etc/ld.so.cache, so that none of the system libraries get loaded. How can this be done? I have looked at mechanisms like setting the LD_LIBRARY_PATH environment variable or launching the program wrapped inside /lib/ld-linux.so, but these methods all seem to supplement the loading of libraries from /etc/ld.so.cache, but not override it completely. Help?

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• (When) Does hardware, especially the CPU(s), deliver wrong results?

  - by sub

  What I'm talking about is: Is it possible that under certain circumstances the CPU "buggs" and suddenly responses 1+1=2? In which parts of the computer can that happen (HDD, RAM, Mainboard)? What could be the causes? Bad quality? Overheating? Does that even happen? When yes, how frequently? If everything is okay with the CPU (not a single fault in production, good temperature), can that still happen sometimes? What would be the results of, let's say one to three wrong computations? This is programming related as it would be nice to know if you can even rely on the hardware to return the right results.

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• Why does C++ linking use virtually no CPU? (updated)

  - by John

  On a native C++ project, linking right now can take a minute or two, yet during this time CPU drops from 100% during compilation to virtually zero. Does this mean linking is primarily a disk activity? If so, is this the main area an SSD would make big changes? But, why aren't all my OBJ files (or as many as possible) kept in RAM after compilation to avoid this? With 4Gb of RAM I should be able to save a lot of disk access and make it CPU-bound again, no? update: so the obvious follow-up is, can VC++ compiler and linker talk together better to streamline things and keep OBJ files in memory, similar to how Delphi does?

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• Hold most of the object in cache/memory insted of database?

  - by feiroox

  Hi All, It just occurred to me why not to have most of the objects in a cache(memory) when an application start. if it's not that large web application. Or to have a settings for how much I want to put in the cache/memory. I just guess it could require to have something like below 1 GB RAM or a lot less. Everything in order to speed up the application even more by not querying database. Is it good idea?

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• how to force drupal function to not use DB cache?

  - by Alaa

  Hi All, i have a module and i am using node_load(array('nid' = arg(1))); now the problem is that this function keep getting its data for node_load from DB cache. how can i force this function to not use DB cache? Example my link is http://mydomain.com/node/344983 now: $node=node_load(array('nid'=arg(1)),null,true); echo $node-nid; output 435632 which is a randomly node id (available on the system) and everytime i ctrl+F5 my browser i get new nid!! Thanks for your help

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• How to check CPU temperature on a HP P2000?

  - by Pavel

  I have a HP StorageWorks MSA Storage P2000 G3 SAS. show sensor-status gives something like # show sensor-status Sensor Name Value Status ---------------------------------------------------- On-Board Temperature 1-Ctlr A 53 C OK On-Board Temperature 1-Ctlr B 52 C OK On-Board Temperature 2-Ctlr A 61 C OK On-Board Temperature 2-Ctlr B 63 C OK On-Board Temperature 3-Ctlr A 53 C OK On-Board Temperature 3-Ctlr B 53 C OK Disk Controller Temp-Ctlr A 34 C OK Disk Controller Temp-Ctlr B 32 C OK Memory Controller Temp-Ctlr A 66 C OK Memory Controller Temp-Ctlr B 67 C OK [...] Overall Unit Status OK OK Temperature Loc: upper-IOM A 40 C OK Temperature Loc: lower-IOM B 38 C OK Temperature Loc: left-PSU 36 C OK Temperature Loc: right-PSU 40 C OK [...] is one of the values the CPU/FPGA temperature? Or, if not, how do I get it? Thanks!

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• explorer.exe eating all CPU, how to to detect culprit?

  - by JohnDoe

  Windows 7 64bit. I am using ProcessExplorer from Sysinternals, and it says, that the offending call is ntdll.dll!RtlValidateHeap+0x170 however, the call stack towards the entry is always different, so it's hard for me to track the problem. Maybe it's a mal-programed trojan, causing exceptions in Explorer.exe, but that is only a wild speculation. Explorer.exe is then consuming 25% (a core on a dual core). Killing the process makes the task bar go away, respawning from task manager, and half a minute later it's again eating all CPU cycles.

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• Can I provision half a core as a virtual CPU?

  - by ramdaz

  I am virtualization newbie. Please advise on these questions. Please note using a commercial VM software like Citrix or VMware is not a choice for me. I have at my disposal a couple of 2x 4 core servers with 32 GB RAM. I need to create 16 VMs on each server to test some web applications. Can I provision half a core as a virtual CPU for each VM? To my best knowledge I can't do so on Xen. Is it possible on KVM or some other free open source VM solution? If it's not possible to assign half a core, how do I ensure that uniform processing power is available for all VMs? Since the job is to create separate instances for hosting 16 web apps in a physical server, do you recommend setting up a private cloud using Ubuntu Enterprise Cloud as a better option? Is there HA solution under KVM, like Remus for Xen?

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• How much thermal paste should apply to the CPU?

  - by iconiK

  There a million different pages around the Internet with conflicting information on how much thermal paste to apply and how to spread it. Some say a half-bean-sized drop in the middle, others say a circle or rectangle on the CPU. Some tell you to let the heatsink's base spread it, while others say to spread it with a knife or your finger with a plastic bag on it. Some coolers even come it with applied fully on the base, like Corsair H50 and all Arctic Cooling products. What is the best way to apply and spread thermal paste, and how much of it?

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• Why should krfb use so much cpu when I never use it?

  - by Newton Falls

  I was playing around with KSysGuard and I noticed the process using the most cpu was krfb, which is the server process for desktop sharing. I never use desktop sharing so I suppose it is a default loaded process. Why would this process use so much juice (around 15%) when I never use it and it really shouldn't be doing much of anything? I don't see any network activity so I don't think I am being hacked. I have suspended the process and nothing bad seems to have happened. Can I assume this is a safe thing to do?

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• Dual Core or Quad Core CPU for NetBeans/Eclipse development?

  - by cdb

  I am going to buy a new desktop CPU. I am a programmer who mainly uses NetBeans IDE for Java web application development, with GlassFish application server. I went through the discussion regarding Dual Core or Quad Core. My doubt is that software like IDEs (NetBeans, Eclipse, etc., with a server running) may not be written with multiple cores in mind? I am not a game addict... So what is best for me, and which company should I choose, AMD/Intel?

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• Why might apache2 use 100% of CPU at startup?

  - by QuantumMechanic

  This is apache 2.2.14 on SLES9. Out of nowhere (i.e. it had been working fine for ages) I am seeing apache2 suddenly start using 100% of the CPU at startup, and never completing startup. Nothing is getting written to /var/log/error_log (when it did back when things were OK). ps only shows the main httpd process and not any of the spawned threads. When things were OK, it would show the spawned threads. So it appears httpd is going into some sort of infinite loop right at startup and isn't even completing startup. It's not an issue of being overloaded by connections -- this happens even when nothing is trying to contact it. The config files haven't changed (or at least they haven't changed in a way that changed their last-modified time). I've tried added -e debug -E /var/log/apache2/startup_info to the command line, but nothing is put in the file. Any ideas what could be happening?

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• Why does WMI Provider Host ( WmiPrvSE.exe ) keep spiking my CPU ?

  - by Sathya

  I generally keep my laptop on 24x7, and at the end of the day it's really annoying to have my thighs burnt because over overheating. The overheating seems to be a result of WMI Provider Host ( WmiPrvSE.exe ) spiking the CPU utilization to 25% every few minutes. Any ideas why this is happening ? I have an HP Envy 14 (w/ the HP bundled crap) running on Windows 7 Home Premium. (Note: Based on @nhinkle's past observations, it seems that HP Wireless Manager might be the culprit, is there any way to confirm this ?)

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• Tell browsers to cache until last modified date changes?

  - by Chad Johnson

  My web site consists of static HTML files which are usually republished once per day, and sometimes more. I'm using Apache. In the vhost settings for my site, I'd like to tell browsers to cache HTML files indefinitely, until Apache sees that they are modified. So as soon as an HTML file is changed, Apache should immediately begin telling browsers it's changed and send the updated file. As soon as a new file is published, browsers should immediately begin receiving that...they should never receive old versions of files. Maybe ExpiresByType text/html modification and no "plus x days." Is something like this possible?

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• Hide Drive / Avoid Low Diskspace Warning on ReadyBoost Cache?

  - by Simon Richter

  I've just added an SSD as a ReadyBoost cache drive, and have two minor cosmetic issues with it: the drive still shows up in the drive list I get a warning balloon every five minutes that the drive is full and that I should empty the Recycle Bin. The former is ignorable (and I guess I can solve it with a group policy); the latter is somewhat going on my nerves. Are there official buttons "hide ReadyBoost drives" and "do not warn on low diskspace for ReadyBoost drives" somewhere that I may have missed? If not, I guess I can use the group policy to hide the drive; I'd still need a way for the system to not warn about the drive being full. Also, am I right that I need to assign a drive letter and format the drive with NTFS to use it for ReadyBoost, or is there a way to just use the raw device?

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• How can I reduce the CPU usage of Offline Files?

  - by Diego

  Whenever I have the Offline Files service running, there is a constant 25% CPU usage on svchost.exe (this is a quad core, so that means it's using up one core). This, in turn, triples the power consumption and keeps the machine hot... I do have several GB synchronized (music collection), but they are not changing at all, in either side. Am I misusing this feature? Is there anything I can configure to keep it down when there's nothing to do? Or should I forget about it and synchronize big folders manually?

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