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  • Apple a commencé à stocker des données d'utilisateurs en Chine pour améliorer la performance des services iCloud

    Apple a commencé à stocker des données d'utilisateurs sur des serveurs chinois pour améliorer la performance des services iCloudLa Chine avait exprimé son inquiétude pour les produits d'Apple. Tout récemment, elle aurait interdit les appareils d'Apple dans les achats du gouvernement, les ministères , les administrations locales et les services centraux du parti communiste, pour « des problèmes de sécurité ». Apple semble avoir trouver comment regagner la confiance du gouvernement chinois.Dans un...

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  • Is there a performance difference between Cat5 and Cat6 keystone blocks?

    - by Scott Anderson
    I'm going to be wiring my home for ethernet soon, and I've already decided that I want to use Cat6 cable to do it (faster speeds, better performance, etc). During the installation, I'd like to add wall-plates to certain rooms in my house, and the keystone blocks look like the best option for me. My question is: I've seen different keystone blocks on many cabling websites, some say Cat5e and some say Cat6. The Cat6 ones are slightly more expensive. Is there any noticeable performance gain from using a Cat6 keystone? To me, it just seems like the keystone really wouldn't matter, since it's basically like putting an RJ-45 end on a cable. Can I buy the cheaper Cat5e keystone blocks and still have the performance that Cat6 cable will give me? Thanks!

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  • Mac OS X 10.6.2 vs. Ubuntu 10.04 Performance

    <b>Phoronix:</b> "...for those impatient ones today we have published an extensive set of tests comparing the performance of Mac OS X 10.6.2 against a development build of Ubuntu 10.04. This is our first time exploring how Canonical's Lucid Lynx can compete with Apple's Snow Leopard."

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  • Does one's choice of 3d modeling software used during asset creation affect performance at runtime?

    - by user134143
    Does software used to create 3d assets (for game development specifically) have an impact on the efficiency of the program? In other words, is it possible to reduce the operating footprint of an application merely by utilizing alternative development software during production of 3d assets? If you use two different applications to create a 3-dimensional image of a box, can one of them result in better performance if aspects of the image are identical? I am attempting to get the information I need without causing unnecessary debate over specific software choice.

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  • La version 2.2 de NeoAxis 3D est disponible le moteur de jeux vidéo en C# se voit doter d'un outil d'analyse de performance

    La version 2.2 de NeoAxis 3D est disponible Le moteur de jeux vidéo, multi-plateforme, en C# atteint la version 2.2. Même si c'est une mise à jour mineure, celle-ci apporte : Physique des personnages : refonte complète du code de la physique des personnages ;Physique des personnages : ajout du support de la position accroupie ;Ajout d'un outil d'analyse de performance dans l'éditeur de carte. L'outil fournit des informations détaillées sur les composants du moteur, l'utilisation des ressources...

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  • Will low level programms become obsolete once the "post-performance" world arives? [closed]

    - by nbv4
    With the new iPhone 5 being as powerful as the supercomputers of the 1980s, its only a matter of time when the latest phones will be powerful enough to run a twitter-scale web application from within my pocket. When that time comes, performance will no longer be something programmers need to care about. Will low level languages still have a place? Or will everyone move to dynamic languages like Python?

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  • What is the best managed VPS Hosting as far as Performance, Cost, and Customer service? [closed]

    - by Scotty
    Possible Duplicate: How to find web hosting that meets my requirements? I'm currently using inmotionhosting which is great in all of the category's listed in this questions title except for the cost. I'm on a tight budget and am looking for something a little more affordable while still have great performance and Customer service. I prefer linux and an affiliate program would also be a huge plus. Any recommendations?

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  • What are some good ways to store performance statistics in a database for querying later?

    - by Nathan
    Goal: Store arbitrary performance statistics of stuff that you care about (how many customers are currently logged on, how many widgets are being processed, etc.) in a database so that you can understand what how your servers are doing over time. Assumptions: A database is already available, and you already know how to gather the information you want and are capable of putting it in the database however you like. Some Ideal Attributes of a Solution Causes no noticeable performance hit on the server being monitored Has a very high precision of measurement Does not store useless or redundant information Is easy to query (lends itself to gathering/displaying useful information) Lends itself to being graphed easily Is accurate Is elegant Primary Questions 1) What is a good design/method/scheme for triggering the storing of statistics? 2) What is a good database design for how to actually store the data? Example answers...that are sort of vague and lame... 1) I could, once per [fixed time interval], store a row of data with all the performance measurements I care about in each column of one big flat table indexed by timestamp and/or server. 2) I could have a daemon monitoring performance stuff I care about, and add a row whenever something changes (instead of at fixed time intervals) to a flat table as in #1. 3) I could trigger either as in #2, but I could store information about each aspect of performance that I'm measuring in separate tables, opening up the possibility of adding tons of rows for often-changing items, and few rows for seldom-changing items. Etc. In the end, I will implement something, even if it's some super-braindead approach I make up myself, but I'm betting there are some really smart people out there willing to share their experiences and bright ideas!

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  • How to tweak the performance of Bit blit on Barco monitors?

    - by krishna
    Hi, The performance of bit blit on Small monitor(16 bpp,60Hz,1280X1024 resolution) it gives 0.9909ms. The performance of big monitors(8bpp,60hz,2048X5260) it gives 52.315ms . I use SRCCOPY to do the bit blit operation.how we can optimize the performance of bit blit on big monitor? Please share your thoughts. Thanks kk

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  • DB2 increase bufferpool size and compressed tables not equal better performance. Why?

    - by Mestika
    Hi, I’m working on tuning and increasing the performance of my IBM DB2 version 9.7 database. I’ve been searching around the net for the last couple of days and learned that if I created my tables in COMPRESS mode and created one more bufferpool and set both of them to access 1024mb, then the performance in my queries should increase because of the less I/Os to the disks. However, when I run my time analysis, the performance Decrease. I added the new additions to my regular database with the indexes I’ve used all the time. Each time I search google I come up with the statement that: Increased bufferpool size and several bufferpools AND a table compression SHOULD prove to get better performance. I’m very puzzled about the total unexpected result. Are there some tuning mechanisms I’ve forgot or does anyone have a explanation for this odd behavior? Sincerely Mestika

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  • Zero-channel RAID for High Performance MySQL Server (IBM ServeRAID 8k) : Any Experience/Recommendation?

    - by prs563
    We are getting this IBM rack mount server and it has this IBM ServeRAID8k storage controller with Zero-Channel RAID and 256MB battery backed cache. It can support RAID 10 which we need for our high performance MySQL server which will have 4 x 15000K RPM 300GB SAS HDD. This is mission-critical and we want as much bandwidth and performance. Is this a good card or should we replace with another IBM RAID card? IBM ServeRAID 8k SAS Controller option provides 256 MB of battery backed 533 MHz DDR2 standard power memory in a fixed mounting arrangement. The device attaches directly to IBM planar which can provide full RAID capability. Manufacturer IBM Manufacturer Part # 25R8064 Cost Central Item # 10025907 Product Description IBM ServeRAID 8k SAS - Storage controller (zero-channel RAID) - RAID 0, 1, 5, 6, 10, 1E Device Type Storage controller (zero-channel RAID) - plug-in module Buffer Size 256 MB Supported Devices Disk array (RAID) Max Storage Devices Qty 8 RAID Level RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 1E Manufacturer Warranty 1 year warranty

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  • Impact of the L3 cache on performance - worth a dual-processor system?

    - by Dan Nissenbaum
    I will be purchasing a new high-end system, and I would like to have a better sense of whether a dual-processor Xeon system (I am looking at the new, high-end Xeon E5-2687W) might, realistically, provide a noticeable performance improvement due to the doubling of the L3 cache (20 MB per CPU). (This is in addition to the occasional added advantage due to the doubling of cores and RAM.) My usage scenario is, roughly, that I have many background applications running at any time - 3 or 4 data compression/backup applications, a low-impact web server, one or two virtual machines at any given time (usually fairly idle), and perhaps 20 utility programs that utilize a noticeable (but small) portion of the CPU cores. In total, when I am not actively using the computer, about 25% of the total CPU power is utilized in my current i7-970 6-core (12 thread) system. When I am doing routine work, the CPU utilization often exceeds 50%, and occasionally hits 75%-80%. The Xeon E5-2687W is not only a second-generation i7 (so should improve performance for that reason), but also has 8 cores (16 threads), rather than 6 cores. For this reason, I expect to run into the 75% CPU range even less frequently. Nonetheless, the ability to double the cores and the RAM is a consideration. However, in the end, I believe this decision comes down to whether the doubling of the L3 cache will provide a noticeable improvement. There are many benchmarks, and a lot of discussion, regarding CPU power. However, I find very little discussion of L3 cache utilization, and how increases in the L3 cache (such as doubling it with dual processors) affect performance. For example: If there are only two processes running, but each benefits from a large L3 cache (such as might be the case for background processes that frequently scan the file system), perhaps the overall system performance might noticeably improve with dual CPU's - even if only a single core is active on each CPU - due to each process having double the effective L3 cache. I am hoping that someone has a sense of the benefits of increasing (or doubling) the L3 cache size. Note: the CPU I am considering (the Xeon E5-2687W) has 20 MB L3 cache, so a system with dual CPU's would have 40 MB L3 cache.

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  • Database Snapshots of Mirrored databases affect performance of Principal database?

    - by yrushka
    I have 2 servers set in Mirroring High-safety. One is Principal and another in Mirror. Currently I have 2 snapshots of a Production database (100 GB size) created on Principal server (for no_lock purpose of massive select processes) and 2 snapshots on the mirror server for the same database for reporting purposes. I know snapshots reduce performance of source databases but I am not sure if snapshots from mirror server have any impact on principal server's performance. thanks,

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  • Apache conf for high trafic CMS with backend users?

    - by Annan
    I'm in the situation where a website is going to have a high number of web users and a few backend webmasters. Webmasters will upload images (+other high mem tasks) and this bumps up the memory allocation of the httpd child processes to 100-150mb. In order to stop swapping I'm currently setting MaxClients in httpd.conf to 20. However this lowers maximum simultaneous requests. Will this be a problem when the website goes live? What is the best configuration? Info: Drupal 6, PHP 5, Apache 2.2 (Prefork atm) I'm thinking about Worker MPM, two apache instances or low MaxRequestsPerChild.

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  • Is it bad to have a very full hard drive on a high traffic database server?

    - by MikeN
    Running an Ubuntu server with MySQL for a high traffic production database server. Nothing else is running on the machine except the MySQL instance. We store daily database backups on the DB server, is there any performance hit or reason why we should keep the hard disk relatively empty? If the disk is filled up to 86%+ with the database and all of the backups, does it hurt performance at all? So would the DB server running with 86-90%+ full capacity perform less well in any way than the server running with only a 10% full disk? The total disk size on the server is over 1 TB so even 10% of the disk should be enough for basic O/S swapping and such.

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  • mysql 5.0.23 vs 5.5 performance benefits and upgrade issues?

    - by WarDoGG
    I have been told that mysql 5.5 has a significant performance boost compared to 5.0 Our server handles a lot of data (around 30 million records processed per 5-10 seconds) and requires every drop of performance boost we can give. Will it be beneficial if we upgrade from 5.0.23 to mysql 5.5? Also, we have lots of database indexes setup on the tables and I've been told that sometimes the indexes become corrupt after a version upgrade and they have to be rebuilt. Is this true?

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  • Does QEMU's performance (still) lag VirtualBox's and is there a way to improve it without kvm?

    - by Catskul
    I've noticed several articles that have claimed that QEMU is slower than VirtualBox (without hardware assistance) but several are years old, and the newest seemed to be from last year. Is it true that QEMU is slower than VirtualBox? If so why? Are there any tricks to close the performance gap? Some of my host systems do not have virtualization support so I'm especially interested in performance tips that work without the kernel module.

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  • VM Virtual guest machine disk defrag improves performance, myth or reality?

    - by jafin
    In operation of a virtual Vmware or Hyper-V guest typically advice is given to defrag the host and virtual disk images so to result in improved performance. Something like a cmd: vmware-vdiskmanager -d <file.vmdk> works great. Yet I can't find any qualitive evidence that suggest defraging inside the guest VM improves performance. Does anyone have advice or evidence that doesn't come from a commercial defragger's whitepaper that suggests inside guest defragging helps?

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  • Why is RAM usage so high on an idle server? [duplicate]

    - by DeeDee
    This question already has an answer here: Why is Linux reporting “free” memory strangely? 2 answers I'm investigating a server used for scientific data analysis. It's running RHEL 6.4 It has almost 200GB of RAM. It's been running very slowly for users via SSH, and after some poking around I quickly noticed that the RAM usage was sky-high. What's odd is that even in an idle state it's still using a ton of RAM: I also looked via htop and I can't see that any running process is using more than 0.1% of the RAM. So I wonder what's going on? Right now the only user-initiated process running is an rsync between two NFS-mounted shares. I tried rebooting the server and it was much more responsive for a few minutes, but then memory usage shot up again. Is there any way I can pinpoint why memory usage is so high?

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  • sensors reporting weird temperatures

    - by Felix
    lm-sensors is reporting weird temps for me: $ sensors coretemp-isa-0000 Adapter: ISA adapter Core 0: +38.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0001 Adapter: ISA adapter Core 1: +35.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0002 Adapter: ISA adapter Core 2: +32.0°C (high = +72.0°C, crit = +100.0°C) coretemp-isa-0003 Adapter: ISA adapter Core 3: +42.0°C (high = +72.0°C, crit = +100.0°C) w83627dhg-isa-0290 Adapter: ISA adapter Vcore: +1.10 V (min = +0.00 V, max = +1.74 V) in1: +1.62 V (min = +0.06 V, max = +0.17 V) ALARM AVCC: +3.34 V (min = +2.98 V, max = +3.63 V) VCC: +3.34 V (min = +2.98 V, max = +3.63 V) in4: +1.83 V (min = +1.30 V, max = +1.15 V) ALARM in5: +1.26 V (min = +0.83 V, max = +1.03 V) ALARM in6: +0.11 V (min = +1.22 V, max = +0.56 V) ALARM 3VSB: +3.30 V (min = +2.98 V, max = +3.63 V) Vbat: +3.18 V (min = +2.70 V, max = +3.30 V) fan1: 0 RPM (min = 0 RPM, div = 128) ALARM fan2: 1117 RPM (min = 860 RPM, div = 8) fan3: 0 RPM (min = 10546 RPM, div = 128) ALARM fan4: 0 RPM (min = 10546 RPM, div = 128) ALARM fan5: 0 RPM (min = 10546 RPM, div = 128) ALARM temp1: +88.0°C (high = +20.0°C, hyst = +4.0°C) ALARM sensor = diode temp2: +25.0°C (high = +80.0°C, hyst = +75.0°C) sensor = diode temp3: +121.5°C (high = +80.0°C, hyst = +75.0°C) ALARM sensor = thermistor cpu0_vid: +2.050 V Please note temp3. How can I know what temp3 is, and why it is so high? The system is really stable (which I guess it wouldn't be at those temps). Also, note the really decent core temps, which suggest a healthy system as well. My guess is that the readout is wrong. On another computer it reported temperatures below 0 degrees centigrade, which was not possible, considering the environment temperature of ~22-24. Is this some known bug/issue? Should I try some Windows programs (like CPU-Z) and see they give similar results?

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  • Is Query Performance different for different versions of SQL Server?

    - by Ronak Mathia
    I have fired 3 update queries in my stored procedure for 3 different tables. Each table contains almost 2,00,000 records and all records have to be updated. I am using indexing to speed up the performance. It quite working well with SQL Server 2008. stored procedure takes only 12 to 15 minutes to execute. (updates almost 1000 rows in 1 second in all three tables) But when I run same scenario with SQL Server 2008 R2 then stored procedure takes more time to complete execution. its about 55 to 60 minutes. (updates almost 100 rows in 1 second in all three tables). I couldn't find any reason or solution for that. I have also tested same scenario with SQL Server 2012. but result is same as above. Please give suggestions.

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  • Drawing of a huge model - How to regain performance?

    - by marc wellman
    I have a huge model I want to draw in my XNA application but because of its size I am experiencing a tremendous loss of performance. The model has about ~50 000 000 edges and has a size on disk of 205 MB in DirectX Format. Please don't ask whether this model has to be that big - yes it has! Is there a way to transfer the model directly to my GPU in order to let the GPU do the drawing like when transferring a VertexBuffer like this: graphicsDevice.Vertices[1].SetSource(_instanceBuffers[i], 0, _sizeofMatrix); because when I try to fill a vertexBuffer with all the vertices I am getting a OutOfMemoryException.

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  • .NET Compiler Platform (Roslyn) , its relevance to developer community and its performance? [on hold]

    - by jerriclynsjohn
    I'm just starting out with a Code-Quality-plugin development for my organization based on the recently released .NET Compiler Platform APIs (Roslyn APIs). I would like to know what are the most relevant possible ways that it could be used by the developer community apart from the usual IDE experience as answered in other questions. I was wondering the implications of opening up a compiler to general public and never came across anything "breakthrough", that could possibly add up to the value of IDE experiences. Is there any performance bottleneck for its implementation since the compiler itself is managed code?

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