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  • using arrays to get best memory alignment and cache use, is it necessary?

    - by Alberto Toglia
    I'm all about performance these days cause I'm developing my first game engine. I'm no c++ expert but after some research I discovered the importance of the cache and the memory alignment. Basically what I found is that it is recommended to have memory well aligned specially if you need to access them together, for example in a loop. Now, In my project I'm doing my Game Object Manager, and I was thinking to have an array of GameObjects references. meaning I would have the actual memory of my objects one after the other. static const size_t MaxNumberGameObjects = 20; GameObject mGameObjects[MaxNumberGameObjects]; But, as I will be having a list of components per object -Component based design- (Mesh, RigidBody, Transformation, etc), will I be gaining something with the array at all? Anyway, I have seen some people just using a simple std::map for storing game objects. So what do you guys think? Am I better off using a pure component model?

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  • Under Windows CE, how can I check which RAM based DLLs are loaded in virtual memory space?

    - by Michal Drozdowicz
    I have a problem with loading a DLL under Windows Mobile 5.0. I'm pretty confident that this is caused by running out of the application virtual memory (the 32 MB slot of the process, as explained in Windows CE .NET Advanced Memory Management). I'm looking for a way to actually make sure that this is the issue and investigate whether my efforts bring expected results. Do you know of a way to check the contents of the virtual memory application slot? Any applications that can help me with this task?

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  • Why and How to avoid Event Handler memory leaks ?

    - by gillyb
    Hey There, I just came to realize, by reading some questions and answers on StackOverflow, that adding event handlers using += in C# (or i guess, other .net languages) can cause common memory leaks... I have used event handlers like this in the past many times, and never realized that they can cause, or have caused, memory leaks in my applications. How does this work (meaning, why does this actually cause a memory leak) ? How can I fix this problem ? Is using -= to the same event handler enough ? Are there common design patterns or best practices for handling situations like this ? Example : How am I supposed to handle an application that has many different threads, using many different event handlers to raise several events on the UI ? Are there any good and simple ways to monitor this efficiently in an already built big application ? Thanks in advance!

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  • Shared memory of same DLL in different 32 bit processes is sometimes different in a terminal session

    - by KBrusing
    We have an 32 bit application consisting of some processes. They communicate with shared memory of a DLL used by every process. Shared memory is build with global variables in C++ by "#pragma data_seg ("Shared")". When running this application sometime during starting a new process in addition to an existing (first) process we observe that the shared memory of both processes is not the same. All new started processes cannot communicate with the first process. After stopping all of our processes and restarting the application (with some processes) everything works fine. But sometime or other after successfully starting and finishing new processes the problem occurs again. Running on all other Windows versions or terminal sessions on Windows server 2003 our application never got this problem. Is there any new "feature" on Windows server 2008 that might disturb the hamony of our application?

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  • How to manage memory for ios with large csv files?

    - by Pell000
    I'm new to ios development, and I'm running into issues relating to memory management and my approaches to dealing with large datasets. Right now, I am loading the csv files and storing the relevant data as objects in memory at app initialization. Some of the csv files are larger than 1MB, and in total, my app uses about 180MB of memory. This is obviously way too high of a number (unless the info I found is wrong and this is an acceptable number, then please let me know). I feel as though there is a fundamental flaw in my approach: is there a way I can avoid storing the csv files in the project itself? Or, is there a kind of "lazy" loading I can do so that I can simply look up info in the csv file, as opposed to loading all of the data from it at once? Any help would do. I think that I need a new perspective in how to manage this more efficiently.

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  • How to interpret output from Linux 'top' command?

    - by Ali
    Following a discussion made HERE about how PHP-FPM consuming memory, I just found a problem in reading the memory in top command. Here is a screenshot of my top just after restarting PHP-FPM. Everything is normal: about 20 PHP-FPM processes, each consuming 5.5MB memory (0.3% of total). Here is the aged server right before restart of PHP-FPM (one day after the previous restart). Here, we still have about 25 PHP-FPM with double memory usage (10MB indicating 0.5% of total). Thus, the total memory used should be 600-700 MB. Then, why 1.6GB memory has been used?

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  • 'Memory read error',Sever hardware error?

    - by wss8848
    hello I got a error about my server which is running CentOS5.5. MCE 20 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 1 BANK 8 TSC 6ab9ff9745f62 [at 2394 Mhz 9 days 1:50:52 uptime (unreliable)] MISC cf36ad0100081186 ADDR 203376500 MCG status: MCi status: MCi_MISC register valid MCi_ADDR register valid MCA: MEMORY CONTROLLER RD_CHANNELunspecified_ERR Transaction: Memory read error STATUS 8c0000400001009f MCGSTATUS 0 what is the matter? is memory card error or memory controller error?

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  • Weird connectivity issue wtih USB Wifi stick.

    - by Carlos Nunez
    Hi, all! I'm not sure if this is the appropriate place to throw this question out there, but I'll give it a shot. I'm setting up two PCs, and I've been having massive troubles getting a USB wireless dongle working. I have two Sony VAIOs (Windows XP, SP2) that I found second-hand, and since they will be in a location too far to connect by Ethernet (no, can't do patch panels here :p), I need to connect them by wireless. Easiest and cheapest way to do that at the moment is by using two USB wireless sticks that I've had for a while, but never used. One of the computers is using a SMC-manufactured card, whereas the other is using a Belkin F5D7050. The box with the SMC card can see and authenticate with my router just fine, and has no problem obtaining a DHCP lease. The box with the Belkin, on the other hand, isn't so lucky. While it can see my router and associate with it, it will not obtain a DHCP-issued address. Worse, when I assign a static IP address to the NIC, it can ping the entire network and access the internet (meaning it can authenticate with the router), but no computer can ping to it UNLESS that computer pinged the computer that's pinging it first. Confused? Well, so am I. Has anyone had this issue before? Is this just a sign of a bad card? (For the moment, I have it connected by Ethernet, as I haven't moved it yet. However, this will be a problem when I set it up in its new home later.) Thanks! -Carlos Nunez

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  • CIFS mounted drive setting "stick-bit" on all files, cannot change permissions or modify files

    - by mattmcmanus
    I have a folder mounted on an Ubuntu 8.10 sever through cifs that I simply cannot change the permissions on once mounted. Here is a breakdown of what's going on: All files within the mounted folder automatically have their permissions set to -rwxrwSrwx regardless of whether the file is create on the windows server or on the linux machine. I have the same directory mounted on two other linux servers (both running 9.10 instead of 8.10) with no problems at all. They all are using the same fstab options and the same credentials. //server/folder /media/backups cifs credentials=/etc/samba/.arcadia_cred,noexec,noserverino 0 0 I've I run a chmod command a million different ways, all of which report successfully changing the permissions. However it doesn't. The issue began after I updated from 8.04 to 8.10 Any idea why this may be happening on one machine? Since it started after an upgrade I'm not sure what is the bes thing to do. Any help you could give would great! None of my automated backup scripts are working because of this!

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  • Stick floating eclipse windows on second screen with Mac OS 10.9 Mavericks

    - by James
    When working with eclipse, I'm used to have a floating window with the console and other views on my secondary monitor. Since the update to OSX 10.9 (Mavericks), I still can drag the floating window to the secondary screen, but it keeps popping back to the main monitor when e.g. changing the perspective - which is really annoying. This did not happen with Mac OS 10.8. Is there a way that the floating windows of eclipse stay on the secondary monitor?

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  • Apache consuming large memory with Apache Mobile Filter

    - by VarunGupta
    I installed and configured Apache Mobile Filter module for Apache to redirect users to mobile version of our website, depending on their user agents. I configured the module to use WURFL. But as soon as I start Apache it hogs a large amount of memory (without any in-coming web requests): Resident Memory: 300 to 400 MB Virtual Memory: 300 to 650 MB Without this module, Apache was consuming much lesser memory (4 to 10 MB). What could be the reason here?

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  • How to make cygwin shortcut stick to Windows 7 dock

    - by Frank Krueger
    I have recently installed cygwin on a Windows 7 beta machine. Everything works great, except one little annoyance: The cygwin shortcut (Start-All Programs-cygwin-cygwin Bash Shell) cannot be pinned to the Start menu. My guess as to why is that I already have a "Console" window pinned to the start menu. My guess is that Windows sees that the two EXEs are the same and won't let me pin it. This would be fine except I cannot pin the window to the Dock either. While cygwin is running, WIndows interprets it as just a Command Window and won't let me pin it either. How do you pin the cygwin shortcut to the dock?

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  • problem in exporting a partition on a usb stick as nfs volume

    - by Bond
    I have a USB disk which has 2 partitions.I exported one of them (on NFS) and now I am trying to mount it at client machine. Each time it gets error mount -t nfs 192.168.1.19:/media/vol2 /mnt/nfs/ mount.nfs: access denied by server while mounting 192.168.1.19:/media/vol2 Here is the /etc/exports file entry showmount -e on nfs server gives Export list for bond: /media/vol2 */24 On the client machine nfs-client package is installed. What more I need to check? Is it logged some where?

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  • How do I create an MBR on a USB stick using DD command line tool

    - by Lana Miller
    Okay I'm trying to create a BOOTABLE Windows7 image on a USB key from a Mac running Lion. My image is .iso format. I tried: sudo dd if=/Users/myusername/Win7.iso of=/dev/disk1 bs=1m And this succeeded in writing the files, except in DISK UTILITY on the mac, it shows the partition type as GUID Partition Table and not 'Master Boor Record'. Booting the key on my Vista computer yields the error "No boot sector on USB Device' From what I can tell, bs=1m in the DD command should have left 1 Megabyte for the boot sector, but for some reason this area of the USB Key is not set up correctly so that it will boot How can I fix this, or correctly use dd to write a bootable cd image such that it is now a bootable usb drive? Note: in the instructions I read about, they recommended renaming my Win7.iso to Win7.dmg before using DD, which made absolutely no sense to me, so I didn't do it. I could try with that step now, but it takes 1.99 hours to write the image to the USB drive so there is a huge penalty to trial and error here. Thank you.

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  • Ubuntu won't boot from USB memory stick

    - by mackenir
    I used the instructions on this webpage to create a bootable USB drive for running Ubuntu 9.10. Unfortunately it doesn't work on my EeePC. Even with 'Removable Dev.' selected in the BIOS as the first boot device, the PC just boots into Windows 7. How do I troubleshoot this problem? The drive is readable and looks like this: Directory of E:\ 28/10/2009 21:14 <DIR> .disk 28/10/2009 21:14 222 README.diskdefines 28/10/2009 21:14 143 autorun.inf 28/10/2009 21:14 <DIR> casper 28/10/2009 21:14 <DIR> dists 28/10/2009 21:14 <DIR> install 28/10/2009 21:14 <DIR> syslinux 28/10/2009 21:14 4,098 md5sum.txt 28/10/2009 21:14 <DIR> pics 28/10/2009 21:14 <DIR> pool 28/10/2009 21:14 <DIR> preseed 28/10/2009 21:14 0 ubuntu 26/10/2009 16:16 1,468,640 wubi.exe 25/02/2010 00:28 2,147,483,648 casper-rw 8 Dir(s) 5,290,307,584 bytes free

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  • Problem booting hard drive after installing Centos from USB Stick

    - by Rick
    Here is the situation, I created a Centos Live 5.4 Bootable USB drive. I used this to install Centos on a HP Netbook. BTW: the Netbook doesn't have a CDRom so I used the usb key. When the system goes to write the Grub boot loader to disk, it wants to write the boot loader to the usb drive (/dev/sda), not the hard disk (/dev/hda). I do have the option of writing the boot loader to /dev/hda, (not to the mbr!) but when I reboot I get an load error and the Grub prompt. How can I get Centos booting from the hard disk instead of using the USB key. Thanks.

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  • Bootable ISO to USB stick xp wuickest method

    - by brux
    My dog took a leak on my PC when I went out (ye funny), now it reandomly restarts - im convinced the HDD is failing because the Windows seagate diagnostic program fails on a few tests. I want to run this prior to windows in an attempt to try and recover sectors, the program includes an iso which can be written to cd and booted, but i dont have any cd's. I tried using unetbootin to create the bootable usb from the iso file (SeaToolsDOS222ALL.576.ISO) but it doesnt work. When i boot from the usb hdd unetbootin loads with "default" in the menu. No joy booting though. I checked the usb hdd in windows and all the files are there, extracted from the iso file, wont boot though. Any ideas? Im using windows xp, or

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  • "System volume folder" always appearing in USB storage stick

    - by ?????? Oyewole
    Whenever I move or copy video files from the PC (Windows 8.1) to my USB storage device and plug it into my TV, I always see a system volume folder on the USB device. This folder can be seen on the PC also, if I choose "view protected system files". My flash drive is formatted with a FAT32 file system. The question is, why is this happening on Windows 8.1, since I never had this problem on Windows 8 before upgrading, and how can I disable this feature?    OK, that's two questions.

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  • How to stick my changes in httpd.conf on WHM/Cpanel/EasyApache

    - by Seiti
    I'm setting up a server and trying to configure the Apache. It only needs to work as a frontend to Tomcat. To do that I added some instructions to the VirtualHost directive, using mod_proxy: <VirtualHost *> ServerName myserver.domain.com ProxyRequests Off ProxyPass / http://myserver.domain.com:8080/ ProxyPassReverse / http://myserver.domain.com:8080/ </VirtualHost> It works fine, and if the need comes, I´ll use mod_jk. But, how do I do it the right way using easyapache, and stop it to always rewrite my changes.

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  • Booting from hard drive fails after installing Centos from USB Stick

    - by Rick
    I created a Centos Live 5.4 Bootable USB drive. I used this to install Centos on a HP Netbook. When the system goes to write the Grub boot loader to disk, it wants to write the boot loader to the usb drive (/dev/sda), not the hard disk (/dev/hda). I do have the option of writing the boot loader to /dev/hda, (not to the mbr!) but when I reboot I get an load error and the Grub prompt. How can I get Centos booting from the hard disk instead of using the USB key.

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  • Bootable ISO to USB stick xp quickest method

    - by brux
    My dog took a leak on my PC when I went out (ye funny), now it reandomly restarts - I'm convinced the HDD is failing because the Windows seagate diagnostic program fails on a few tests. I want to run this prior to windows in an attempt to try and recover sectors, the program includes an iso which can be written to cd and booted, but i dont have any cd's. I tried using unetbootin to create the bootable usb from the iso file (SeaToolsDOS222ALL.576.ISO) but it doesnt work. When i boot from the usb hdd unetbootin loads with "default" in the menu. No joy booting though. I checked the usb hdd in windows and all the files are there, extracted from the iso file, wont boot though. Any ideas? Im using windows xp. More info - when the computer restarts (like i just did now) it constantly reaches the end of POST and then restarts in infinite loop. If I pull the power cable out it will get back into windows, the longer i leave it between attempts, the longer I am able to stay in windows until it restarts. i.e if i leave the power cable out 5 minutes it will stay operable for longer than if i had left it out for only a few seconds.

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