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• ASP.NET MVC framework port for Java EE?

  - by Adam Asham

  So I've played some with the new, not yet final release of ASP.NET MVC framework and I find it to be very nice and elegant. However at work we are tied to Java for the time being, so I'm wondering this: is there a port of the framework out there for Java people like myself? I realize that webforms isn't going to be available unfortunately but what about the routing framework? /Adam

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• Online java training

  - by sezhian

  I am looking for online webbased/CBT training/self study training videos for Java EE related technologies like Struts, JSF, JPA, Websphere, Spring and Hibernate. I'm using learndevnow for Microsoft related technologies. It's really good, I am looking for similar thing for Java EE. Any suggestions please?

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• Processing image data in java me

  - by Trimack

  Hi, I want to process raw data from a picture taken in java me with byte[] snap = videoControl.getSnapshot(encoding); My question is, whether I should try working already with snap or should I first create the image from this array Image im = Image.createImage(snap, 0, snap.length); and then work with that? Or is there some better documentation of both methods, i.e. getSnapshot and createImage than the Java API reference?

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• Netbeans: Using JavaMail in normal Java projects

  - by Yohan

  I am creating an desktop application which is capable of sending emails. I downloaded mail.jar and javaee.jar and added it to my project libraries. However, when I am trying to use it, it gives me the error java.lang.ExceptionInInitializerError Caused by: java.lang.RuntimeException: Uncompilable source code - package javax.mail does not exist I imported those packages as, import javax.mail.* It added correctly, as shown in the following image. Please help!! How can I make this work?

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• Is Java really fit for mobile phone programes?

  - by httpinterpret

  Java needs JVM to function, but JVM requires about 200MB of memory. So I doubt there is any mobile phone fit for Java, is there?

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• Apache memory leak with Subversion server

  - by bruce grissom

  Does anyone know of a way to fix the Apache memory leak in relation to Subversion Server? We have a windows server 2003 machine running Apache to host Subversion. From day one, we have had memory leak issues and have not found a solution yet. All we do is monitor our server when when the memory use reaches near the max it can handle we have to restart Apache.

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• Ubuntu 12.04 LTS vs Ubuntu 14.04 LTS memory usage

  - by geoffroy

  My droplet has 512 MB memory and is running Ubuntu 12.04 LTS 64 bits and a Rails 4 application + several workers. It's running well. I tried to deploy the same thing on a Ubuntu 14.04 LTS 64 bits droplet and I've got plenty of memory related problem (can't fork). Is Ubuntu 14.04 LTS using way more RAM than Ubuntu 12.04 LTS? Is there something I should know to lower memory usage ? Should I stick with Ubuntu 12.04 LTS?

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• Memory usage on debian webserver keeps going up

  - by Steven De Groote

  my webserver is running apache 1.3.x for a PHP application, along with mysql on the same machine. Most of the time it runs fine, CPU usage still with nice margin, but somehow memory usage keeps growing throughout uptime. While it looks like it is chunked from time to time, I've had moments my server going down because it's out of memory. Restarting apache or mysql only reduced memusage by 100M. Attached is an overview of monthly memory usage. The 2 massive drops are server restarts after out-of-memory situations. http://imageshack.us/photo/my-images/51/memorymonth.png/ Any explanations for his behaviour or how I could solve this? Thanks! Steven

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• Simple tool to graph memory usage?

  - by dbr

  Is there a script that will show memory usage as a graph, for example as a pie-chart, with each process being being a separate slice? I'm not looking for something like Munin to graph memory usage over time, but rather show the memory usage per-process at a single point in time. To make my request even more obscure, it is for a headless server (so no X applications). The simplest way would be to write a PNG file, or possibly an HTML file (which could use Javascript to allow the filtering of processes, changing between graph-types and so on)

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• Memory consumption of each accept() call on server running on Windows 2008 [migrated]

  - by Atul

  I've written a simple and small server application on Windows 2008 that just accepts connections and does nothing else. I am doing memory footprint assessment of socket calls, What I found that each connection (after accept()) consumes at least 2.5 KB of memory. Interestingly, the memory is not consumed by the process that has accept() call but it consumed by a OS process. I believe it might be because of data structures being created inside OS for each connection. Now, I have two key questions: Is it possible by any means to reduce this memory footprint (by changing any parameters, configuration etc) ? If yes how ? (Because 2K for each connection would be too much if we planning server to accept millions of connections) If my server is intended to accept million connections, is it good idea to use Windows 2008 ? or shall I switch to some other OS? Please advice me.

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• Tool for viewing used and free memory on windows system

  - by patrick

  I'm looking for a tool that will allow me to see all of the memory used by by Windows XP/2003 machine. I know that Process Explorer and others will show you what memory is being used by each process, but I need a full graphical view of all used and unused memory on my machine. I have seen an app that does this but cannot remember the name. Anyone know of a tool like this?

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• Mac has become insanely slow : Processes SystemUIServer, UserEventAgent and loginwindow using a lot of memory

  - by SatheeshJM

  I have been using my Mac for for many months without any problem. But recently all of a sudden the Mac became insanely slow. I opened Activity Manager to see what was happening. For three processes SystemUIServer, UserEventAgent and loginwindow, the memory gradually increases and reaches upto 2 GB for each process. This completely hangs up my Mac. I tried the following : 1. Restart Mac 2. Restart Mac in safe mode 3. Manually kill the processes 4. Remove Date and Time from Menu bar(this was supposed to be the problem for the SysteUIServer process's memory according to many users) 5. Removed the externally connected keyboard and mouse(some had suggested this for UserEventAgent's memory) No luck with any of those. The moment I log in, the memory spikes up. Any idea what the hell is happening? Please help.

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• Slow transfer with memory stick (819 kb/s)

  - by Nrew

  What do I do to optimize the file transfer rate of a Memory Stick Duo? The file transfer was not like this when it was still new. Can reformatting give new life to a memory stick? It takes about 20 minutes just to transfer 1Gb of file from computer to memory stick. The computer is decent enough. 2.50Ghz processor, 2Gb ram.

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• windows xp blue screen dumping physical memory

  - by dotnet-practitioner

  I get following blue screen after running my laptop for an hour... A problem has been detected and windows has been shut down to prevent damange to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps: Check to be sure you have adequate disk space. If a driver is identified in the stop message, disable the driver or check with the manufacturer for driver updates. Try changing video adapters. Check with your hardware vendor for any BIOS updates. Disable BIOS memory options such as cashing or shadowing. If you need to use safe mode to remove or disable components, restart your computer, press F8 to select advanced startup options, and the select safe mode. Technical Information: * STOP 0x0000008E (0xc0000005, 0x805B03F5, 0xF703DC7C, 0x00000000) Beginning dump of physical memory Physical memory dump complete. Contact you system administrator or technical support group for further assistance. so.... if this is a faulty memory.... from where I could buy RAM for following laptop.... TOSHIBA SATELLITE A45-S250 My local Frys store does not carry memory for this laptop.

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• Macbook memory upgrade question

  - by James Evans

  I've read some conflicting articles on Macbooks and memory upgrades. Some say you have to buy the "special" Mac memory (bulls$%t), others say manufacturers like Partriot and Ocz will work fine. My Macbook (non-pro) is about 6 mos old with it's 2 GB of memory (SO-DIMM 1066MHz DDR3). Does anyone have any definitive information of what will work? Thanks!

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• Macbook memory upgrade question

  - by James Evans

  I've read some conflicting articles on Macbooks and memory upgrades. Some say you have to buy the "special" Mac memory (bulls$%t), others say manufacturers like Partriot and Ocz will work fine. My Macbook (non-pro) is about 6 mos old with it's 2 GB of memory (SO-DIMM 1066MHz DDR3). Does anyone have any definitive information of what will work? Thanks!

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• Reducing apache VIRT and RES memory usage

  - by lisa

  On a quad-core server with 8GB of ram I have apache processes that use up to 2.3GB RES memory and 2.6GB VIRT memory. Here is a copy of the top -c command http://imgur.com/x8Lq9.png Is there a way to reduct the memory usage for these apache processes? These are my httpd.conf settings Timeout 160 TraceEnable Off ServerSignature Off ServerTokens ProductOnly FileETag None StartServers 6 <IfModule prefork.c> MinSpareServers 4 MaxSpareServers 16 </IfModule> ServerLimit 400 MaxClients 320 MaxRequestsPerChild 10000 KeepAlive On KeepAliveTimeout 4 MaxKeepAliveRequests 80

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• SQL server peformance, virtual memory usage

  - by user45641

  Hello, I have a very large DB used mostly for analytics. The performance overall is very sluggish. I just noticed that when running the query below, the amount of virtual memory used greatly exceeds the amount of physical memory available. Currently, physical memory is 10GB (10238 MB) whereas the virtual memory returns significantly more - 8388607 MB. That seems really wrong, but I'm at a bit of a loss on how to proceed. USE [master]; GO select cpu_count , hyperthread_ratio , physical_memory_in_bytes / 1048576 as 'mem_MB' , virtual_memory_in_bytes / 1048576 as 'virtual_mem_MB' , max_workers_count , os_error_mode , os_priority_class from sys.dm_os_sys_info

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• How to get the installed Memory Type

  - by balexandre

  Windows 7 could be better at this, it tells everything about the computer CPU but only the Memory amount Microsoft should add information about DDR type, speed and maybe CL as well. While this never happens, What's the best and easy way to check the installed memory so we can buy and upgrade it? I was thinking a simple software so I don't need to install the full SiSoft Sandra for example, just looking for something small, only for the memory part.

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• Reporting memory usage per process/program

  - by Nick Retallack

  How can I get the current memory usage (preferably in bytes so they can be added up accurately) for all running processes individually? Can I roll up the summaries for child processes into the process that spawned them? (e.g all apache threads together). Sometimes, my server runs out of memory and becomes unresponsive. I want to discover what is using up all the memory. Unfortunately, it's likely to not be a single process. Some programs spawn hundreds of processes, each using very little memory, but it adds up. On a side note, is it normal for apache to spawn 200+ processes?

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• Fresh install CentOS 6.4 64b with directadmin slowly consumes all memory and crashes

  - by Coen Ponsen

  Dear server fault community, This is my first question on server fault, i'm new to server (mis)configuration so please forgive me for asking something stupid :) I'm running Directadmin on a CentOS 6.4 64b with 4GB memory and over 10000Gh virtual machine. I migrated my websites because my former vps couldn't keep up anymore. Only half of the websites from this 1GB machine were migrated jet. So the migration is still in progress and already my server crashes every day. The server performance up until that moment is perfect. The directadmin log files show nothing out of the ordinary. Yesterday only the mysql server crashed but it also crashed the entire machine before. The memory usage in DA seems to be normal: directadmin directadmin (pid 3923 22158 22159 22160 22161 22162 )8.75 MB dovecot dovecot (pid 3851 ) 47.8 MB exim exim (pid 1350 ) 1.29 MB httpd (pid 21525 21528 21529 21530 21531 21532 21546 21571 21742 21743 21744 )490.4 MB mysqld mysqld (pid 1299 ) 287.8 MB named named (pid 3807 ) 16.3 MB proftpd proftpd (pid 1481 ) 1.91 MB sshd sshd (pid 1173 21494 ) 5.16 MB Restarting services immediately frees up memory, but slowly over time the memory usage increases(about 24 hours to crash). The commands: # sync # echo 3 > /proc/sys/vm/drop_caches Will free al memory correct. I could just create a cronjob but it seems the wrong way around to me. I can't seem to pinpoint the cause. Any advices, references or tips are highly appreciated! Greetings, Coen edit: free -m : after drop_caches: total used free shared buffers cached Mem: 3830 735 3095 0 0 21 -/+ buffers/cache: 712 3117 Swap: 991 0 991 I'll post another one this evening.

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• Google Chrome is running my system out of memory

  - by jasondavis

  I am running Windows 7 x64 with 12GB of RAM I often have multiple windows and a ton of tabs open. I use the extension Session Buddy to restore all my windows and tabs once the memory gets too high. So my 12gb of ram will get up to around 93% used because of Chrome, now I can close chrome down and restore the same amount of windows and tabs and it will only use about 25% of memory, it then over time increases back up to the 90% zone after several hours. It seems that when I close tabs, instead of freeing that memory up, it doesn't so that is why the huge increase of memory usage as new tabs are opened and closed it just adds up, this sounds like a huge bug in chrome. Just for an example I just re-booted my system, I only have 1 window with 4 tabs open and in the task manager, it shows 29 chrome.exe processes I then killed all chrome processes and opened a chrome window with just 1 tab, it made 27 chrome.exe processes. Is this an issue that others have? More importantly, is there a fix? UPDATE I just read that each plugin and extension creates a chrome.exe process, I then couunted 24 extensions so that helps explain a portion of the large processes. Still not sure about memory not being freed up though!

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• MySQL Memory Limit Windows Server 2003

  - by Matt

  I am running MySQL 5.0.51a on Windows Server 2003 Standard Edition on an HP DL580 G4 with 3GB installed. One of my database tables has grown to 5.3 GB with an index file of 2.5 GB, which I believe is causing MySQL to be slow due to having to constantly load and unload the index file when updates are made to the table. The server itself seems to be performing OK because MySQL is only using about 500MB of memory (there are other apps running on the system, but MySQL uses the most memory). The table is fairly active with new records getting adding all during day but no deletes, ever. The MySQL server has up to 600 connections allowed, but only small number (10 or 20) would actually be writing to this table. I increased the memory limits in MySQL but since the max connections is so high I don't think I can give each connection 1GB without risking a problem. Is there some tuning that would let just certain connections get a lot of memory? So I have started to look for alternatives to avert the crisis I know is coming soon. Some of the options I have: Upgrade to Server 2003 Enterprise to install 64GB of memory. Question: would 32 bit MySQL be able to access more than 2GB? Would that be 2GB per thread? That would still be smaller than the index table size so it might not solve the problem completely, but it would be better than now. Upgrade to Server 200x 64 bit and MySQL 64 bit. Switch to a *nix 64 bit server. If anybody has suggestions for things to do in the meantime, opinions on which way to go, or other things that I have overlooked I would appreciate the help. Thanks

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• Why is my browser using so much memory?

  - by Steve

  Hi. I've recently had problems with Firefox running very slowly when I have many tabs open; say 20 tabs. My whole system would slow down. I decided to give Google Chrome a try, and it started out fine. But lately I am finding that it too, slows down my whole system. Looking at Task Manager, chrome.exe is using about 250MB of memory in about 6 different entries in task manager. However, when I shut Chrome down, memory usage is reduced by about 600MB. How can this be? (shows drop in memory usage after ending Chrome.) When my system locks up with Chrome having many tabs open, it takes 10 seconds to load the Start Menu, 10 seconds to expand All Programs, and each folder and subfolder, and 30 seconds for the program to be highlighted under my mouse. It also takes 10 seconds to switch to Notepad. Why is Chrome appearing to use so much more memory than Task Manager indicates? Why is my pagefile being used when I have around 1.1GB of memory? Can I set Chrome to run in RAM and not in the pagefile? How can 20 tabs use 600MB? That's 30MB per tab. Thanks for your help.

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• How to change memory for DomU runtime

  - by saffron

  I have a xen server with xen-4.1.3, linux-image-3.2.0-3-amd64, debian squeeze and 16Gb of RAM. The domain-0 has 1Gb of ram, the rest of memory belongs to the hypervisor. I want to start a guest domain with a minimal amount of memory and increase it runtime later. When I start a guest domain with 256Mb of ram and run xm mem-set domu 4Gb, I get ~3Gb only in domu and a guest domain free says: root@test:~# free total used free shared buffers cached Mem: 2830620 72868 2757752 0 2432 43504 -/+ buffers/cache: 26932 2803688 Swap: 1048572 0 1048572 And a guest domain dmesg says: [ 0.000000] Memory: 175912k/2883584k available (3527k kernel code, 448k absent, 2707224k reserved, 3210k data, 612k init) When I start a guest domain with 2Gb of ram I can run xm mem-set domu 7Gb and get ~7Gb of ram in a guest domain: root@test:~# free total used free shared buffers cached Mem: 6828228 74944 6753284 0 1328 12568 -/+ buffers/cache: 61048 6767180 Swap: 1048572 0 1048572 And a guest domain dmesg: [ 0.000000] Memory: 1674960k/16651264k available (3527k kernel code, 448k absent, 14975856k reserved, 3210k data, 612k init) How can I start a guest domain with a minimal amount of ram (256Mb) and increase it under 15Gb?

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