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• Best use of new express card on Windows

  - by jckdnk111

  I just bought a 48GB SSD express card for my laptop and I am trying to decide how best to use it. I will be running some sort of virtualization (prob VirtualBox) to test / learn Windows Server administration. I am running Windows 7 Ultimate 64 bit. I have 4GB of RAM and a 7200 RPM SATA hard disk. The express card will read at 115MB/s and write at 65MB/s. So how best to use this new disk? Readyboost, relocate pagefile, store VM disks, mix / match?

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• Ngingx max worker_connections and access log

  - by MotoTribe

  I'm troubleshoot an issue with my site. I'm seeing in the ngingx-error.log that the max worker_connection limit has been reached when the site went down. I'm not seeing an increase of requests during that time in the ngingx-access.log. Does that mean the mysql database had a bottleneck at that time that caused the requests to queue up? Or would it not log any requests that where made after the max worker_connection limit has been reached?

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• How do you format arrays within parameters?

  - by joslinm

  I'm talking about something like this: echo $form->input('general_addresss', array( 'label' => 'Where will you go today?' 'format' => array('before', 'input', 'after', 'label', 'after', 'error') )); Do you start with one array parameter, then break a line? If it can't fit on a line, do you immediately break a line? After of which, do you do a set number of tabs over? What happens if an array within an array has lots of properties? Is there any particular guide you follow?

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• What is bottleneck of my Apache server ?

  - by rrh

  $netstat -anp | grep :80 | grep TIME_WAIT | wc -l 840 $netstat -anp |grep :80 | grep ESTABLISHED | wc -l 50 memory usage : 850MB / 1000MB apache2.conf contains.. <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> Are there any configuration changes that can help me or its just my RAM the bottleneck here? Urgent help needed..!!

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• What are your tricks for optimizing your Subversion configuration?

  - by Scott Markwell

  For a Linux or Windows system, what tricks do you do to optimize your Subversion server? The following are my current tricks for a Linux system serving over Apache with HTTPS and backed by Active Directory using LDAP authentication. Enabling KeepAlive on Apache Disable SVNPathAuthz Increase LDAP Cache Using the FSFS storage method instead of BDB Feel free to call this into question. I don't have hard proof that FSFS out performs BDB, only lots of tribal knowledge and hearsay.

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• WD Caviar Green Extremely Slow

  - by Steven

  I am encountering a really weird problem on my WD Caviar Green HDD. Well first of all I have 2 HDDs on my Desktop, one 160GB Seagate holding my Win7 Ultimate x64 and the problematic one, WD 1.5 Caviar Green for storage purpose. My problem is kinda weird, when I transfer files from my Seagate(C:) to my WD (D:) the speed is good (50-60MB/s). Then the problem arises when I transfer too "many" large files, the transfer speed would go straight down to kilobytes/s. Well after I cancelled the transfer and access my D:, even entering a folder requires loading for like 10 seconds. Such problem not only arises when I am transferring files to my D:, it seems like my WD can't handle much activities. For instance, last time I installed my game on D: and I would face much lag after playing for some time. When the same game is installed on C: no problem arises. Does anyone knows what is the problem? P/S: There was one temporary solution that I used to tried. After the "situation" occurs, I tried to access as many folders on D: as I can and let it load, repeating such actions and giving it some time bring the D: back to speedy transfer. However, large transfers would causes the situation to happen again. Does it have something to do with cache whatsoever?

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• How many megabytes per second may I expect from a gigabit USB 2.0 network card under linux?

  - by Nakedible

  I'm interested in the actual real-word throughput attainable with an external 1000BaseT USB 2.0 network card under Linux. I have been able to attain 90 megabytes per second on a PCI-E interface, but the USB 2.0 bus has a theoretical limit of 480Mbit/s, and in practice less than 40 megabytes per second. Is the actual throughput attainable with such a card under linux 40, 30, 20, or even as low as 10 megabytes per second, eg. no better than a normal 100BaseT network card?

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• Per process I/O accounting on AIX

  - by ipozgaj

  Is there a way of getting per process I/O statistics on AIX, i.e. to get current disk I/O rate of a process? Commands like iostat, nmon, topas etc. can't display such data. Filemon also doesn't help. Actually, what I would need is something much like iotop(1) command on Linux. Update: it seems there is no builtin command(s) to do this. I will most probably make my own by using the SPMI API.

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• DD-WRT - Where's the best place to get a LinkSys WRT54G V1.0?

  - by Giffyguy

  Looking for the initial release of the LinkSys WRT54G, not V1.1 or V2.0 or anything like that. If it comes with DD-WRT pre-installed, even better. That being said, I suppose a side question would be whether SU recommends different hardware. After all, DD-WRT may have been originally built for the WRT54G and the WRT54Gv1.0 may have better hardware than any of the successive models, but it's still fairly dated. Are there newer routers that are more stable or performant with DD-WRT?

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• Maximise network transfer speed of various applications

  - by Alex

  When using nc, scp, wget to transfer files between 2 machines on a dedicated 2Mbps link, I get speeds between 0.5 and 1 Mbps. However, when I use iperf -c 10.0.1.4 -t 20 -P 12 (for example) I can maximise the speed of the link (getting stable 2Mbps). Is there a way to make single stream transfers (such as those done by scp) to utilise all/most of the link? Some kind of tcp settings, or iptables...?

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• Why does Oracle SQL Developer take so long to open?

  - by oscilatingcretin

  I think anyone who's used Oracle SQL Developer will agree that it's painfully slow on the load. My research has lead me to a solution that seems to have helped a little, and that's telling OSQLD not to check for updates on startup. However, it still takes several minutes to open. What could OSQLD possibly be doing during load time? Is there any way get it to open right away? Edit: Adding potentially relevant system specs: CPU: Intel i5-2520M 2.5 ghz Windows 7 32-bit RAM: 4 gb

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• What ever happened to the Defense Software Reuse System (DSRS)?

  - by emddudley

  I've been reading some papers from the early 90s about a US Department of Defense software reuse initiative called the Defense Software Reuse System (DSRS). The most recent mention of it I could find was in a paper from 2000 - A Survey of Software Reuse Repositories Defense Software Repository System (DSRS) The DSRS is an automated repository for storing and retrieving Reusable Software Assets (RSAs) [14]. The DSRS software now manages inventories of reusable assets at seven software reuse support centers (SRSCs). The DSRS serves as a central collection point for quality RSAs, and facilitates software reuse by offering developers the opportunity to match their requirements with existing software products. DSRS accounts are available for Government employees and contractor personnel currently supporting Government projects... ...The DoD software community is trying to change its software engineering model from its current software cycle to a process-driven, domain-specific, architecture-based, repository-assisted way of constructing software [15]. In this changing environment, the DSRS has the highest potential to become the DoD standard reuse repository because it is the only existing deployed, operational repository with multiple interoperable locations across DoD. Seven DSRS locations support nearly 1,000 users and list nearly 9,000 reusable assets. The DISA DSRS alone lists 3,880 reusable assets and has 400 user accounts... The far-term strategy of the DSRS is to support a virtual repository. These interconnected repositories will provide the ability to locate and share reusable components across domains and among the services. An effective and evolving DSRS is a central requirement to the success of the DoD software reuse initiative. Evolving DoD repository requirements demand that DISA continue to have an operational DSRS site to support testing in an actual repository operation and to support DoD users. The classification process for the DSRS is a basic technology for providing customer support [16]. This process is the first step in making reusable assets available for implementing the functional and technical migration strategies. ... [14] DSRS - Defense Technology for Adaptable, Reliable Systems URL: http://ssed1.ims.disa.mil/srp/dsrspage.html [15] STARS - Software Technology for Adaptable, Reliable Systems URL: http://www.stars.ballston.paramax.com/index.html [16] D. E. Perry and S. S. Popovitch, “Inquire: Predicate-based use and reuse,'' in Proceedings of the 8th Knowledge-Based Software Engineering Conference, pp. 144-151, September 1993. ... Is DSRS dead, and were there any post-mortem reports on it? Are there other more-recent US government initiatives or reports on software reuse?

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• SQL Server 2005 running at 97% CPU usage

  - by Shiraz Bhaiji

  How can I findout which statements are using the CPU?

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• mpstat on slackware 13.0 shows no utilization

  - by conartist6

  As the title says, the mpstat command, executed on Slack 13.0 continuously shows almost no processor utilization of any sort. In fact none of the output ever seems to change at all. The system is dual processor board with two hyperthreaded P4 Xeons. Any ideas? 08:50:06 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 08:50:06 PM all 0.38 0.00 0.03 0.03 0.00 0.00 0.00 99.56 1510.46 08:50:06 PM 0 0.50 0.00 0.05 0.10 0.00 0.01 0.00 99.33 11.90 08:50:06 PM 1 0.32 0.00 0.03 0.01 0.00 0.00 0.00 99.64 0.00 08:50:06 PM 2 0.38 0.00 0.03 0.01 0.00 0.00 0.00 99.58 0.00 08:50:06 PM 3 0.29 0.00 0.02 0.00 0.00 0.00 0.00 99.68 0.00 This is, literally, the only output I can get from the program. No values change ever.

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• BackupExec 12 + RALUS - VERY slow backups

  - by LVDave

  We use Backup Exec 12 and the Remote Agent for Linux/Unix Servers (RALUS) to backup a large RHEL5 system. For various reasons we need to do a daily working set job. These working-set jobs run abysmally slow. The link between the target machine and the BE server is gigabit, and any other type of job runs 1-3GB/min. These working-set jobs start out at perhaps 40MB/min and over the course of the backup job slowly drops down so low that the BE job rate display in the "current jobs" goes blank.. Since we usually are only doing changed-files for one day, the job is usually small and finishes overnight and we don't worry abotu the slowness, but we had some issues with the backup server, and missed about 6 days of fairly heavy work on the Linux box, so this working-set job will be a doozy.. We have support with Symantec, and I've pestered them a lot about this, they've had me run RALUS in debug mode, sent them that log and a VXgather from the BE host and they had no fix/workaround.. To give an idea, I have the mentioned working-set job running for the last 3 1/2 hours and it's backed up just under 10MEGAbytes.... I'm posting this here to see if anybody in the "real world" has seen this/and/or has any ideas what might be causing these abysmally slow jobs, since Symantec seems to be clueless...

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• Sample Code for the SSIS Book

  - by KnightReign

  Yes, I know I’ve been gone for a long time. I haven’t professionally blogged for years. But, the good folks here, Adam and Peter have out of the goodness of their hearts, left my blog around and well, I though I’d check in. Since then, I’ve changed jobs, gotten divorced, bought a few more laptops, bunches of guitars, a snowboard or two, iPads, iPhones, a few cars, travel to India, Europe, Middle East, backpacked Scotland (and still damp), Nepal and all over the US. I’m three roles away from the SSIS...(read more)

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• cset shield --kthread on: should I use this?

  - by lori

  I'm reading up on cpu shielding using Alex Tsariounov's cset utility here: https://rt.wiki.kernel.org/index.php/Cpuset_Management_Utility/tutorial In the tutorial I'm finding the wording around migrating kernel threads from having access to all cpus to running only in a certain cpuset a bit ambiguous The tutorial says the following: Some kernel threads can be moved into the unshielded system cpuset as well. These are the threads that are not bound to specific CPUs. If a kernel thread is bound to a specific CPU, then it is generally not a good idea to move that thread to the system set because at worst it may hang the system and at best it will slow the system down significantly. These threads are usually the IRQ threads on a real time Linux kernel, for example, and you may want to not move these kernel threads into system. If you leave them in the root cpuset, then they will have access to all CPUs. The tutorial then goes on to say: However, if your application demands an even "quieter" shield, then you can move all movable kernel threads into the unshielded system set with the following command. [zuul:cpuset-trunk]# cset shield -k on cset: --> activating kthread shielding cset: kthread shield activated, moving 70 tasks into system cpuset... [==================================================]% cset: done I am confused by this final sentence. By using the word however, it seems to suggest that you typically should not move the movable kernel threads into the unshielded system set. Is this the case, or is it safe to move kernel threads which can be moved into a cpuset, thereby preventing them from running on some cpus?

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• SQL Server - VMWare install - Utilize more RAM

  - by alex

  We have a SQL server machine - It’s a VMWare image (running on ESXi hardware etc..) It has windows 2008 x64 standard The SQL install is SQL 2008 standard The virtual machine has 12gb of RAM, and 4 virtual CPU The box is suffering from near 100% CPU a lot of the time I enabled the AWE- but SQL server only seems to use 3-4gb of RAM Is there a way of making it use more available ram more effectively? cache results for example..?

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• High Steal Time utilization on Apache Linux Server

  - by JMC

  I have a CentOS "development / testing" server that runs extremely slowly. It's running Apache and Mysql using PHP. Top reports that 98% of the CPU utilization is frequently spent on "st" - Steal Time. What could cause a server to spend so much CPU on steal time, and how can I diagnose the problem? I didn't notice the problem until after I granted a third party developer root access (for all I know it has a root kit running, though unlikely).

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• High frequency, kernel bypass vs tuning kernels?

  - by Keith

  I often hear tales about High Frequency shops using network cards which do kernel bypass. However, I also often hear about them using operating systems where they "tune" the kernel. If they are bypassing the kernel, do they need to tune the kernel? Is it a case of they do both because whilst the network packets will bypass the kernel due to the card, there is still all the other stuff going on which tuning the kernel would help? So in other words, they use both approaches, one is just to speed up network activity and the other makes the OS generally more responsive/faster? I ask because a friend of mine who works within this industry once said they don't really bother with kernel tuning anymore-because they use kernel bypass network cards? This didn't make too much sense as I thought you would always want a faster kernel for all the CPU-offloaded calculations.

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• Issue with aborted MySQL connections (error code: 4)

  - by arikfr

  Some of the connections between my application server (Ubuntu, Apache, PHP) and my DB server (Ubuntu, MySQL) are failing with error code 4. According to the documentation error code 4 is: OS error code 4: Interrupted system call At first I thought that maybe the issue is that the DB server has too many connections and fails because there are too much open files. But it seems not to be the case because: Too many open files has different error code (24). I've checked and during peak time the server had 497 files open (checked using lsof command) while the maximum is 1024. The TCP settings were already checked (see prior question). Any ideas what this can be or what should I check?

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• Linux: find out what process is using all the RAM?

  - by Timur

  Before actually asking, just to be clear: yes, I know about disk cache, and no, it is not my case :) Sorry, for this preamble :) I'm using CentOS 5. Every application in the system is swapping heavily, and the system is very slow. When I do free -m, here is what I got: total used free shared buffers cached Mem: 3952 3929 22 0 1 18 -/+ buffers/cache: 3909 42 Swap: 16383 46 16337 So, I actually have only 42 Mb to use! As far as I understand, -/+ buffers/cache actually doesn't count the disk cache, so I indeed only have 42 Mb, right? I thought, I might be wrong, so I tried to switch off the disk caching and it had no effect - the picture remained the same. So, I decided to find out who is using all my RAM, and I used top for that. But, apparently, it reports that no process is using my RAM. The only process in my top is MySQL, but it is using 0.1% of RAM and 400Mb of swap. Same picture when I try to run other services or applications - all go in swap, top shows that MEM is not used (0.1% maximum for any process). top - 15:09:00 up 2:09, 2 users, load average: 0.02, 0.16, 0.11 Tasks: 112 total, 1 running, 111 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 4046868k total, 4001368k used, 45500k free, 748k buffers Swap: 16777208k total, 68840k used, 16708368k free, 16632k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ SWAP COMMAND 3214 ntp 15 0 23412 5044 3916 S 0.0 0.1 0:00.00 17m ntpd 2319 root 5 -10 12648 4460 3184 S 0.0 0.1 0:00.00 8188 iscsid 2168 root RT 0 22120 3692 2848 S 0.0 0.1 0:00.00 17m multipathd 5113 mysql 18 0 474m 2356 856 S 0.0 0.1 0:00.11 472m mysqld 4106 root 34 19 251m 1944 1360 S 0.0 0.0 0:00.11 249m yum-updatesd 4109 root 15 0 90152 1904 1772 S 0.0 0.0 0:00.18 86m sshd 5175 root 15 0 90156 1896 1772 S 0.0 0.0 0:00.02 86m sshd Restart doesn't help, and, by they way is very slow, which I wouldn't normally expect on this machine (4 cores, 4Gb RAM, RAID1). So, with that - I'm pretty sure that this is not a disk cache, who is using the RAM, because normally it should have been reduced and let other processes to use RAM, rather then go to swap. So, finally, the question is - if someone has any ideas how to find out what process is actually using the memory so heavily?

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• How do you disable the magnifier in Windows Vista?

  - by PhantomDrummer

  Every so often while I'm working, if I accidentally jolt the mouse, the magnifier starts. I'm fairly sure the cause is that some comination of mouse keys is supposed to start the magnifier, and I occasionally hit the right keys accidentally. However, I've never been able to reproduce the behaviour deliberately so I don't know which combination. This is very annoying since switching the magnifier off is non-trivial (control panel, or run dialog, which are hard to use when the magnifier keeps - ummm - windowing and magnifying the bit of screen you're about to click on :-) ). So I'm wondering if there's any way to disable the magnifier completely, so that it doesn't start when you do whatever it is you'd normally do to the mouse to start it? Anyone know?

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• html5 video source code [closed]

  - by Jeeva Nandhan

  !DOCTYPE html This is my vid.html file and my video1.js file is given below the .java file is public class MyWebAppActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); WebView myWeb=(WebView) findViewById(R.id.webView1); myWeb.getSettings().setJavaScriptEnabled(true); myWeb.setWebChromeClient(new WebChromeClient()); myWeb.loadUrl("file:///android_assets/www/vid.html");}} Am receiving an error in emulator that Web page not available in the file:///android_assets/www/vid.html

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• Code better with JustCode Q1 SP1

  We've just uploaded the Service Pack 1 for JustCode so feel free to log in to your Telerik accounts and download JustCode. Earlier this week Visual Studio 2010 RTM was released and we are happy to announce that this version of JustCode fully supports it. Other areas of interest in this release are the typing assistance behavior and JavaScript formatting. We also further optimized JustCodes memory usage and speed. Youll find the full release notes for the Service Pack here.  Visual Studio 2010 changes As Visual Studio is now officially out we now fully support its final version as well as the new .NET 4.0 framework features. Typing Assistance improvements As JustCodes first official release approached we started getting an increasing number of requests for a typing assistance feature. In spite of being at a fairly advanced stage of our development cycle we managed to squeeze in a basic ...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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