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  • Wireshark TCP Window Size Value

    - by T Vernon
    I am debugging an application with Wireshark and watching the TCP Window Size value shrink on one side of the communication. If the packet's TCP section shows a "Window size value: 1", does that mean the source's window size is 1 or the destination's window size is 1? I know one side is communicating faster than the other can handle, I just want be sure I know which one it is. 1 192.168.0.1 - 192.168.0.100, Modbus/TCP, Length: 66, Window Size Value: 1 2 192.168.0.100 - 192.168.0.1, TCP, Length: 60, Window Size Value: 92 3 192.168.0.100 - 192.168.0.1 TCP, Length: 310, Window Size Value: 92 4 192.168.0.1 - 192.168.0.100 TCP, Length: 54, Window Size Value: 0 So is 192.168.0.1's window size 0 or is it reporting that 192.168.0.100's window is 0? Thanks.

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  • LINQ to SQL : Too much CPU Usage: What happens when there are multiple users.

    - by soldieraman
    I am using LINQ to SQL and seeing my CPU Usage sky rocketting. See below screenshot. I have three questions What can I do to reduce this CPU Usage. I have done profiling and basically removed everything. Will making every LINQ to SQL statement into a compiled query help? I also find that even with compiled queries simple statements like ByID() can take 3 milliseconds on a server with 3.25GB RAM 3.17GHz - this will just become slower on a less powerful computer. Or will the compiled query get faster the more it is used? The CPU Usage (on the local server goes to 12-15%) for a single user will this multiply with the number of users accessing the server - when the application is put on a live server. i.e. 2 users at a time will mean 15*2 = 30% CPU Usage. If this is the case is my application limited to maximum 4-5 users at a time then. Or doesnt LINQ to SQL .net share some CPU usage.

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  • Hey, Google: It’s Time to Add Multi-Window Multitasking To Android

    - by Chris Hoffman
    In 2012, Google’s Dianne Hackborn threatened to revoke CyanogenMod’s access to the Android Market if they moved forward with adding “Cornerstone” multitasking to their custom ROM. Samsung has since created their own multi-window multitasking feature. Dianne Hackborn said this “is something that needs to be done at the mainline platform level” so apps wouldn’t break. She was right — Android needs this as a standard feature and it’s time for Google to provide it. Doesn’t Android Have Multitasking? Android originally stood out from Apple’s iOS with its powerful multitasking. Applications can continue running in the background while you’re using another application. This makes Android powerful — you can even have BitTorrent clients downloading files in the background while using another app. Android still kept the design of a single app on screen at a time. This made a lot of sense when Android only ran on smartphones with small screens. Today, Android runs on everything from smaller smartphones all the way up to huge “phablets” like the Galaxy Note. Android has gone beyond phones and runs on 12-inch tablets, convertibles with keyboard docks, laptops, and even Android desktops. Android isn’t just a phone operating system. Samsung’s Multi-Window Isn’t Good Enough Samsung has tried to add value to Android by adding a multi-window feature. When you’re using a high-end phone like the Galaxy Note or Galaxy S, or a Galaxy tablet, you have the ability to run certain apps side-by-side with each other. There are big problems here. This only works on Samsung devices, and only on specific Samsung devices. To add support for this feature in a way that doesn’t break other apps, Samsung’s multi-window feature also only works with specific apps. You can’t just run any app in multi-window view, only the apps on the Multi Window bar Samsung provides. This prevents third-party apps from breaking, which is what Google was worried about with CyanogenMod’s Cornerstone feature. A feature that only works with a handful of apps on specific devices from a single manufacturer isn’t good enough. This feature needs to work on every Android device — or at least ones with suitably large screens and powerful enough internals. It needs to be an Android platform feature so application developers can ensure their apps will work properly with it on every device. Android developers shouldn’t have to add support for each manufacturer’s own multi-window feature if other manufacturers decide to copy Samsung. Floating Apps Are a Dirty Hack Floating apps also enable real multitasking. Remember that Android allows apps to run in the background while you’re using an app in the foreground. These apps can present interfaces that appear floating above the current app — think of it like using “always on top” to make a window always appear over every other app on a desktop operating system. You can install floating apps to browse the web, take notes, chat, and watch videos while using any app. Only apps specifically designed to run as floating apps will work, so you have to seek them out. Floating apps are also awkward to use because they float over the app you’re using, blocking parts of its interface. Microsoft added floating-window support to Skype for Android. You can have a video conversation and the other person’s face will always appear on your screen, even when you leave the Skype app. Microsoft is using more of Android’s multi-window multitasking power than Google is. Custom ROMs and Root-Only Tweaks Aren’t Acceptable Some custom ROMs are adding this feature to Android. Google threatened to revoke CyanogenMod’s access to the Android Market (now known as Google Play) if they added this feature because it could potentially break third-party apps. Today, other custom ROMs are working on split-screen multitasking. Samsung added their own version to their own devices. You can also get this feature by using a root-only Xposed Framework tweak known as XMultiWindow. If you have root access, you can get multi-window multitasking or any app on your device. This shouldn’t require rooting your device or installing a custom ROM. These third-party solutions often have awkward interfaces and bugs. We need an integrated, supported solution that works the same on every device. Why Multi-Window is Important Microsoft’s Windows 8.1 stands out among tablet operating systems for its powerful multitasking support, allowing you to view several apps side-by-side at the same time. Apple is also reported to be working on adding side-by-side apps to the iPad with iOS 8. On every competitor’s operating system, you’ll be able to view a web page while you write an email, watch a video while you browse the web, or chat with someone while you do anything else. But Android’s still remained frozen in time. Despite all Android’s underlying power — and despite the way Android allows apps to adapt to different screen sizes — Google is resisting adding this feature. Large-screen Android tablets like the Nexus 10 (remember that tablet Google hasn’t updated in over 18 months?) need this feature. So do huge phones, convertibles, laptops, and Android desktops. If tablets are the future of personal computing, we should be able to do more than one thing at a time on our tablets’ big screens. Microsoft, Samsung, and even Apple are realizing this — now it’s Google’s turn. Image Credit: Sergey Galyonkin on Flickr, Karlis Dambrans on Flickr

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  • CPU DB like IMDB for Microprocessors

    - by Jason Fitzpatrick
    If you’re interested in the history of microprocessors, the CPU DB at Stanford is a massive database of microprocessors that covers everything from code names to speed to processor families. Play with their visuals or download the entire database and make your own. CPU DB [Stanford.edu] The Best Free Portable Apps for Your Flash Drive Toolkit How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC

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  • Why is iOS "jailbreaking" CPU specific? [closed]

    - by Ted Wong
    Recently, iOS 6 was "jailbroken" but only on the Apple A4 CPU. Why is the "jailbreaking" process specific to a CPU? From Wikipedia: ... "iOS jailbreaking is the process of removing the limitations imposed by Apple on devices running the iOS operating system through the use of hardware/software exploits – such devices include the iPhone, iPod touch, iPad, and second generation Apple TV. Jailbreaking allows iOS users to gain root access to the operating system""" ...

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  • SQL SERVER MAXDOP Settings to Limit Query to Run on Specific CPU

    This is very simple and known tip. Query Hint MAXDOP – Maximum Degree Of Parallelism can be set to restrict query to run on a certain CPU. Please note that this query cannot restrict or dictate which CPU to be used, but for sure, it restricts the usage of number of CPUs in a single [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • nvidia 331.89 super + W causes black window

    - by Heihachi
    When i am hitting Super + W and choosing one of active window it opens. But when i am mazimizing another minimized window i am getting blank black window, if i minimize then maximize it again it works. Tried 340.24 drivers - but they are totally unusable because of interface corruption in firefox, thunderbird, libreoffice. 331.89 seems stable except this annoying black window. I am using GTX 750 ti

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  • How to Identify CPU Bottlenecks in SQL Server

    We experience regular slowdowns on our MS SQL database. After analyzing the memory usage we would like to continue the root cause investigation by examining CPU bottlenecks. What is your recommendation to recognize CPU related bottlenecks in SQL Server? Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • Battery doesn't charge on high cpu load

    - by bhappy
    When my cpu load rises the battery stop working I don't know why i.e If I start playing a game such as counter strike source the battery won't change unless i minimize the window which brings the load down Can someone please help me with this issue Note: sometimes when flash lags for a sec it shows discharging and charging again also due to high cpu load My laptop is a sony vaio F series 127FD model Thanks

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  • High Apache CPU usage, but low nginx - Configured correctly?

    - by Buckers
    We've just moved a website of ours over to a brand new high-spec Linux server (1x Intel Xeon E3-1230 v2 @ 3.30GHz, 8GB DDR3 ECC, 2x 128GB SATA SSD RAID1). The server has been configured to use nginx but we're not sure if its working correctly. The site always loads very fast to us (http://www.onedirection.net), but Plesk often sends us reports that the Apache CPU usage percentage reaches high leves, yet when we look at the nginx percentage it's always very low. We've come from a Windows background so are very new to Linux, but shouldn't nginx run INSTEAD of apache? Here's a screenshot from Plesk showing the CPU usage: http://www.pixelkicks.co.uk/_download/plesk.JPG The website gets around 20,000 visitors per day, and we use W3 Total Cache to get it running as fast as possible. MySQL has been optimised well. Memory usage is only running at 2GB of the 8GB. Does this look right? How can we tell that nginx is doing most of the work? Thanks, Chris.

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  • How could Load average numbers from 'htop' exceed 100% CPU utlization?

    - by Joe Huang
    I use 'htop' to monitor my web server. It's recently quite loaded and the Load average is showing something like this: Load average: 3.10 2.56 1.63 I searched the web about these numbers and I found an article about it: http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages In the article, it says if I have 2 CPUs, 2.0 means 100% CPU utilization. And my VPS has two CPUs, so what does 3.1 mean? How could it exceed 100% CPU utilization? And from these numbers, does it mean I should be wary about the loading now? But the performance seems totally fine, and this is a managed VPS, the hosting company has not notified me any warning about it. During day time, Load average always show these high numbers... here is another snapshot while writing. Load average: 3.03 2.77 1.97 Load average: 0.41 1.29 1.60 <---- 5 more minutes later So I am wondering how much room left for this site to grow in current configurations? What kind of proactive actions I should take in advance? I don't want to wait until the server bursts. Thanks.

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  • My client's solution of a Windows SBS 2011 VM on an Ubuntu host and VirtualBox is pinning the host CPU

    - by Scott Stamp
    Here's my situation, I've got a client hosting two servers (one VM), with the host providing VMware Zimbra, the other Windows Small Business Server 2011. Unfortunately, the person before me had configured this setup as follows. Host: Ubuntu Desktop Edition 10.04 (I know, again, not my choice) running VMware Zimbra 8GB of RAM On-board RAID1 of two 320GB Seagate Barracuda drives for the OS Software RAID5 of four 500GB WD Caviar Black drives on MDADM for bulk storage (sorry, I don't know the model #) A relatively competent quad-core Intel Core i7 CPU from the Nehalem architecture (not suspicious of this as the bottleneck) Guest: Windows Small Business Server 2011 4GB of RAM Host-equivalent CPU allocation VDI file for OS hosted on the on-board RAID, VDI file for storage hosted on the on-board RAID For some reason when running, the VM locks up when sitting nearly idle, and the VirtualBox process reports values of 240%+ in top (how is that even possible?!). Anyone have any ideas or suggestions? I'm totally stumped on this one. Happy to provide whatever logs you'd like to take a look at. Ideally I'd drop VirtualBox and provision this with VMware Workstation, but the client has objected to the (very nominal) costs involved. If hardware needs to be purchased to help, it will be, but we're considering upgrades a last-resort at this time. Thanks in advance! *fingers crossed*

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  • Windows 7 notebook turn off by itself, how to check if it is due to CPU being too hot?

    - by Jian Lin
    I have a Dell Studio 15 notebook, and it just started turning off by itself yesterday. Could it be that the CPU is too hot? I have had several notebooks before and every one of them I can put them on the bed without any problem. This Dell Studio Notebook, however, seems like have the air / fan outlet pointed outward from the bottom back of the notebook, so I suspect that the air is partially blocked when it is on the bed. Are there Win 7 tools that can monitor the CPU temperature, or will some 3rd party tool be needed? (I try to stick to official tools nowadays). Also, it is running Win 7 Ulitmate, there is actually no utility or background service from Win 7 or from Dell that detects when the temperature is too hot (or 95% near the max), pop out a message box giving a warning and say that the computer will go into sleep mode in 1 minute, but instead just turn off the computer by brute force (cutting out the power) right then and there? Update: it turned off right in front of my eyes -- it is not doing any windows update or anything. just normal use and jooooop, it turned off.

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  • (Win7) Gets stuck with ~1% CPU. Especially with multithreading

    - by meow
    Windows 7 32 bit, up to date, Intel i7 860. (For some reason the company runs 32bit Windows everywhere.) I tried to update all motherboard drivers etc. as far as possible. I have a performance issue with a machine which appears in connection with multithreading (or so I think). As an example (and where I most often see it, but it appears on other programs as well): ProteoWizard is a file conversion tool for mass spectrometry files. I can add a list of files and it will attempt to process up to 8 files in parallel (quadcore x 2 threads/core). If I choose 1 to 6 files, I start the process and it goes straight through. If I have =7 files in the queue, conversion goes to ~20%, then gets stuck for 15 seconds, then continues again, always in "chunks" of a few % before getting stuck again. During the time the process is stuck, CPU is at 1%. RAM is not limiting, it is maybe at 70% or so and not going up. I don't get the same problem on other, even slower machines. The computer gets also stuck at 1% CPU doing nothing on other occasions, but for multithreading it is most frequent. Where should I look for the problem?

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  • Linux 'top' utility widly inaccurate (more so for multi-CPU/core hardware)?

    - by amn
    Hi all. After using 'top' for long time, albeit basically, I have grown to distrust it's '% CPU' column reports. I have a 8-core (quad core Intel i7 920 with hyperthreading) hardware, and see some wild numbers when running a process that should not use more than 5% overall. top happily reports 50%, and I suspect it is not so. My question is, is it a known fact that it's inaccurate when several CPUs/cores are present? I used 'mpstat' from the 'sysstat' package, and it's showings are much more conservative, certainly within my expectations. I did press '1' for 'top' to switch it to show all the core and us/sy/io stats, but the numbers are substantially higher than with 'mpstat'... I know that my expectations can be unfound as well, but my gut feeling tells me 'top' is wrong! :-) The reason I need to know is because the process I am monitoring only guarantees quality of service with CPU usage "less than 80%" (however vague that sounds), and I need to know how much headroom I have left. It's a streaming server.

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  • Excluding clicks within a DIV from a window.onbeforeunload

    - by nobosh
    Given the following function: window.onbeforeunload= function() { if (CKEDITOR.instances.stuff.getData().length > 0 && oktoquit == false) { return "You have unsaved changes. Click Cancel now, then 'Save' to save them. Click OK now to discard them."; } }; I'd like a way to exclude this function from running if the user clicks a link in a div with an ID: <div id="ignore me"><a href="">blah</a><a href="">blah</a><a href="">blah</a></div> Any ideas?

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  • Javascript window.onunload fires off after Page_Load

    - by gnomixa
    I have noticed that window.onunload event fires off AFTER page_load event which makes no sense. This behaviour is creating an issue for me - in my unonload I clear the session, so if the Page_Load first BEFORE onunload, there are errors on the page displayed. I would expect the javascript onunload to fire BEFORE Page_Load....is that the correct assumption? TO CLARIFY: Let's assume I am on page test.aspx, then I click on the link that goes to the same page (say I click on a menu), what I observe is that Page_Load fires first, then onunload fires off. Makes no sense at all.

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  • What kinds of job scheduler framework or solution do you recomend on window server system

    - by Samuel.P
    Hi Guys My Company is running a lots of batch jobs to process data for partners. We used to use sql server agent to execute batch process. I found it's very difficult to get batch process information like log or status when i working on sql server's agent. So I'd like to change my company's job scheduling process to another stable solution But I dind't know which solutions to choose. I tried to find as same solution as CA Autosys. My Company use window server system. We shoud consider framework or solution should be configured using solution's api because i plan to make a asp.net web application to manage our job shceduler. What kinds of job scheduler Framework or inexpensive solution do you suggest? Regards, Park PS: I think Quartz Framework has a good reputation on J2EE system. But I am not sure Quartz.NET is as good as orginal java version.

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  • Javascript: window.onload problem

    - by Matrym
    This isn't working in IE (although it does work in FFX). Why? Using HTML in the header: <script type="application/javascript"> // And finally, let's call the code ourselves. window.onload = lbp.init; </script> And then the script: // lbp is the script's universal variable, which retains everything var lbp = {}; // The sequence of functions to trigger lbp.init = function() { alert('hi'); } Thanks in advance for your help =)

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  • window.location call popup up empty dialog on safari

    - by memical
    Hi, on a web page i am trying to redirect the browser to another page on the same site. the code is very simple for that: window.location = "/path1/path2" on safari - both windows as well as mac - a message box containing only the text "http://domain.com" comes up. I have tried different ways of specifying this: location.href, windows.assign(...) ... and the all have the same behavior. Did any of you see this? and do you have a solution for this? Thanks.

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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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