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  • Are there any nasty side affects if i lock the HttpContext.Current.Cache.Insert method

    - by Ekk
    Apart from blocking other threads reading from the cache what other problems should I be thinking about when locking the cache insert method for a public facing website. The actual data retrieval and insert into the cache should take no more than 1 second, which we can live with. More importantly i don't want multiple thread potentially all hitting the Insert method at the same time. The sample code looks something like: public static readonly object _syncRoot = new object(); if (HttpContext.Current.Cache["key"] == null) { lock (_syncRoot) { HttpContext.Current.Cache.Insert("key", "DATA", null, DateTime.Now.AddMinutes(5), Cache.NoSlidingExpiration, CacheItemPriority.Normal, null); } } Response.Write(HttpContext.Current.Cache["key"]);

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  • Do large folder sizes slow down IO performance?

    - by Aaron
    We have a Linux server process that writes a few thousand files to a directory, deletes the files, and then writes a few thousand more files to the same directory without deleting the directory. What I'm starting to see is that the process doing the writing is getting slower and slower. My question is this: The directory size of the folder has grown from 4096 to over 200000 as see by this output of ls -l. root@ad57rs0b# ls -l 15000PN5AIA3I6_B total 232 drwxr-xr-x 2 chef chef 233472 May 30 21:35 barcodes On ext3, can these large directory sizes slow down performance? Thanks. Aaron

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  • Tracking down Data Execution

    - by Agnel Kurian
    I have some malware infecting one of our machines at home. It first showed up as winulty.exe. After investigating, I am of the opinion that winulty.exe itself is an uninfected file but is being modified after it has loaded into memory. Turning on Data Execution Prevention for all processes and services has confirmed this to be true. How do I track down the process responsible for this? I've used File Monitor from sysinternals.com to monitor winulty.exe and see this being accessed by the svchost.exe instance hosting most of the system services and also by dfrgntfs.exe. How do I know which service or which DLL has been infected?

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  • How to step down voltage from 208V to 110V

    - by Eric Dennis
    I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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  • iPhone UIView element similar to the lock screen

    - by Travis
    Does anyone know if there is an open source project for an UIView element that acts in a similar way to the lock screen for the iPhone. I am working on an app that has some sensitive data, and I want to add another layer of comfort for users, to be able to setup a 4 digit pin number on the app. I've seen apps like LoseIt and Weightbot that have similar functionality. There isn't any element for this in the UI Library from what I've been able to find, and was hoping some kind soul might have open sourced something similar to this. Thanks in advance!!!

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  • rdiff-backup failed due to target machine being down, but is unkillable

    - by Markus
    My backup script was invoked by cron, using rdiff-backup to backup the user files onto a target system in the network. That target computer went down at some point, yet still appeared as mounted on the server. rdiff-backup didn't do anything, but still appears as a process. kill-ing doesn't stop it. Similarly, running rdiff-backup for other directories works but doesn't exit properly and remains in the process list. Is there anything short of rebooting the server that I can try?

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  • SSH connection falling down

    - by kappa
    I've set up a connection with autossh that creates some tunnels at system startup, but if I try to connect, after successful login (with RSA key) connection fall down, here a trace: debug1: Authentication succeeded (publickey). debug1: Remote connections from LOCALHOST:5006 forwarded to local address localhost:22 debug1: Remote connections from LOCALHOST:6006 forwarded to local address localhost:80 debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: remote forward success for: listen 5006, connect localhost:22 debug1: remote forward success for: listen 6006, connect localhost:80 debug1: All remote forwarding requests processed debug1: Sending environment. debug1: Sending env LANG = it_IT.UTF-8 debug1: Sending env LC_CTYPE = en_US.UTF-8 debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0 debug1: channel 0: free: client-session, nchannels 1 Transferred: sent 2400, received 2312 bytes, in 1.3 seconds Bytes per second: sent 1904.2, received 1834.4 debug1: Exit status 1 What can be the problem? All this stuff is managed by a script already running on another machine (creating reverse tunnels on the same machine but with different ports)

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  • Network on linux server is periodically down

    - by Fabian
    I have an old server running Fedora 4 that occasionally just stops responding via network for about an hour. This happens 1-2 times a week. Also no connection from the server itself to any other computer on the network is possible when it happens. The network settings and routes look fine. There are no unusual log messages and no unusual processes running at that time. If I restart the network or just do an ifconfig eth0 down & ifconfig eth0 up it works fine afterwards. I know that the server should be updated to a currently supported OS, but that is not really an easy option right now. Any ideas on how I could diagnose and fix that problem?

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  • MySQL service was shut down - why?

    - by Tony
    I have installed MySQL Server 5.5 on the WIndows Server 2008 R2. In the services.msc I see that it has the Startup Type option set to Automatic. Everything was fine until today when that service was somehow turned off, but I did not do this. So, 1) what can makes that service to be shutted down ? 2) Maybe is there any error log ? 3) Is it possible to set that service to be automatically turned on if that situation will come again ?

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  • 'Slow down' A DHCP server on purpose.

    - by Ced
    As the title implies, May look like a silly question, But what i'm trying to do, Is to have 2 DHCP servers in one network. One only leases IPs to Bootp clients (And if the client re-requests immediately after leases again) And one DHCP server, which is builtin with my PFsense router, that leases the non-bootp clients so they can access the internet and other network resources. I know by chance that PFsense uses ISC-DHCPd. Maybe they have a delay option? All i need to do to make sure the bootp/PXE boot clients get the proper address, is slow down the DHCP server in the PFsense box. Question is how. Anyone ideas? Thanks in advance

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  • MEMORY(HEAP) vs. InnoDB in a Read and Write Environment

    - by Johannes
    I want to program a real-time application using MySQL. It needs a small table (less than 10000 rows) that will be under heavy read (scan) and write (update and some insert/delete) load. I am really speaking of 10000 updates or selects per second. These statements will be executed on only a few (less than 10) open mysql connections. The table is small and does not contain any data that needs to be stored on disk. So I ask which is faster: InnoDB or MEMORY (HEAP)? My thoughts are: Both engines will probably serve SELECTs directly from memory, as even InnoDB will cache the whole table. What about the UPDATEs? (innodb_flush_log_at_trx_commit?) My main concern is the locking behavior: InnoDB row lock vs. MEMORY table lock. Will this present the bottleneck in the MEMORY implementation? Thanks for your thoughts!

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  • "lock request time out period exceeded" Error When Trying to See DB Hierarchies

    - by Lloyd Banks
    I have a DB that I can run basic queries (albeit much slower than normal) off of. When I try to see the hierarchy trees for tables, views, or procedures in SSMS Object Explorer, I get the "lock request time out period exceeded". My Report Server reports that run off of objects in this DB are no longer completing. Jobs associated with procedures stored on this DB also do not run. I tried using sp_who2 to find and kill all connections on the DB. This has not solved the problem. What is going on here? How can I resolve this?

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  • SQL Server deadlock issue

    - by George2
    Hello everyone, I am using SQL Server 2008 Enterprise. I am wondering whether dead lock issue is only caused by cross dependencies (e.g. task A has lock on L1 but waits on lock on L2, and at the same time, task B has lock on L2 but waits on lock on L1)? Are there any other reasons and scenarios which will cause deadlock? Are there any other way which will causes dead lock -- e.g. timeout (a S/I/D/U statement do not return for a very long time, and deadlock error will be returned) or can not acquire lock for a long time but not caused by cross-dependencies (e.g. task C needs to get lock on table T, but another task D acquire the lock on table T without releasing the lock, which causes task C not be able to get lock on table T for a long time)? thanks in advance, George

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  • Lock web app only work for intranet

    - by justjoe
    some week in the future i will have job to create php web app that will work as billing process. As the client and my team agree upon, the web app will only deploy in their internal server. This need arose some fundamental questions for myself. how do we lock the web app really really will work only in internal server and not in internet as it asked ? cause this need, the cost for the job have been cut into some degree. so it will be best if it only work as client describe it : it will be deploy in intranet an intranet only What is the pro and cons deploy php application only (with all of its apache server )in intranet ? What is the fundamental different between deploying php app in intranet environment and in internet ? is there anything to be consider ? I know we can put windows in to a flash-disk or pen-disk. i there any autorun apache/php server that work in the same fashion ?

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  • How to recover from locked down XP Home computer

    - by Chris
    We've got a Kiosk machine provided to us by a manufacturer. The video card is flaky, so I want to replace it with another card we have on hand, rather than shipping across the country. The problem is that they have policies in place that locks the system down to a point where only the manufacturers demo works on the computer so I can't install drivers for the newer card. I know pretty much nothing about windows policies or the policy editor. Am I fighting a losing battle trying to replace thi scard?

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  • MEMORY(HEAP) vs. InnoDB in a Read and Write Envirnment

    - by Johannes
    I want to programm a real-time application using MySQL. It needs a small table (less than 10000 rows) that will be under heavy read (scan) and write (update and some insert/delete) load. I am really speaking of 10000 updates or selects per second. These statements will be executed on only a few (less than 10) open mysql connections. The table is small and does not contain any data that needs to be stored on disk. So I ask which is faster: InnoDB or MEMORY (HEAP)? My thoughts are: Both enginges will probably serve SELECTs directly from memory, as even InnoDB will cache the whole table. What about the UPDATAEs? (innodb_flush_log_at_trx_commit?) My main concern is the locking behavior: InnoDB row lock vs. MEMORY table lock. Will this present the bottleneck in the MEMORY implementation? Thanks for your thoughts!

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  • how to "lock" live site when doing (phing) deployment

    - by Jorre
    On http://www.slideshare.net/eljefe/automated-deployment-with-phing in slide 15 they are talking about "locking the live site" when doing deployment. We are running multiple webshops in a SAAS application where it is possible that users are adding products, buying products and paying for products online, and so on... When deploying we want to do this as clean as possible, so that not payments or orders or other critical data will be lost. We have a deployment scenario set up using phing (amazing tool!) but we are missing one crucial step being the "locking of the live site" while deploying. What is a possible way to lock a live site and bring it back online after deploying?

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  • Clicking the mouse down to drag objects on Mac

    - by Uri
    I've been using the following code to issue clicks programmatically on a Mac void PostMouseEvent(CGMouseButton button, CGEventType type, const CGPoint point) { CGEventRef theEvent = CGEventCreateMouseEvent(NULL, type, point, button); CGEventSetType(theEvent, type); CGEventPost(kCGHIDEventTap, theEvent); CFRelease(theEvent); } void Click(const CGPoint point) { PostMouseEvent(kCGMouseButtonLeft, kCGEventMouseMoved, point); NSLog(@"Click!"); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseDown, point); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseUp, point); } Now, I'm trying to click down to be able to drag objects, like a scroll bar or an application's window. I'm using the following: PostMouseEvent(kCGMouseButtonLeft, kCGEventMouseMoved, point); NSLog(@"Click Down!"); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseDown, point); When i ran the code above something interesting will happen, when the left mouse down is issue nothing seem to happen, I move my mouse and the window doesn't move, however when I added a mouse up event then the window jumped to the location where I supposedly dragged it. this is sort of OK, however, how do I can make the mouse click down and drag an object? Note: I do have a whole method to see when the mouse stopped moving so I can click up. please post code. Thanks

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  • How to step down voltage from 208V to 110V

    - by Eric Dennis
    I have some racks that will be fed by 208V/20A circuits. These circuits will be conditioned and battery-backed by the facility in which these racks will live. 99% of the devices in the rack will be able to support 208V input, so I plan to use these PDUs. However, there may be one or two odd devices that will need 110V input. I know that I can use a step-down transformer to provide 110V for these devices, but that seems like overkill for such a small number of devices, plus I don't want to pay extra for the UPS functionality since my power will already be battery-backed. Any suggestions for something I can use for these one-off 110V devices?

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  • populate drop-down values dynamically using Ajax

    - by abhishek
    Hi, I have 3 drop-downs. 1st drop-down contains some values when the page loads. I need to populate 2 nd drop-down based on the value selected in 1st dropdown. Similarly, I need to populate 3 nd drop-down based on the value selected in 1st and 2nd dropdown. Initially I tried like this. <h:selectOneMenu value="#{stu.country}" > <f:selectItems value="#{bean.allCountries}" /> <a4j:support event="onchange" action="#{bean.retrieveStates(stu.country)}" reRender="states_dropDown"></a4j:support> </h:selectOneMenu> //ly, for 2nd drop-down <h:selectOneMenu id="states_dropDown" value="#{stu.state}" > <f:selectItems value="#{bean.allStates}" /> <a4j:support event="onchange" action="#{bean.retrieveCities(stu.country,stu.state)}" reRender="City_dropDown"></a4j:support> </h:selectOneMenu> Some times this code works fine. But some times it doesn't invoke managed bean method. Can you please help??

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  • Tracking down laptops Google has never heard of

    - by John
    Using MS tools to get information on PCs using our software, our customers have sent several Lenovo systems which have names we simply cannot find using Google... no search results at all. Considering these names/ids are returned by querying the system directly, not asking the customer to write it down by looking at the box, this seems odd. The ones we have so far (more than one of each) are: Lenovo 2241BL9 Lenovo 6463Y4H My guess is these are Thinkpads after Lenovo took over the brand, but can anyone help me out with this detective work? edit: the 2nd one does turn up some driver downloads and this page, but it's unclear what any of that means. Is the 6463y4h just a T61? http://smolts.org/reports/view_profile/%20ThinkPad%20T61

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  • HP EX485 Media Server Keeps Powering Down & Restarting Automatically

    - by AWoo
    HP Home Media Server EX485 approx 3 years old. Unit suddenly powers itself off and restarts automatically as if the power button was pressed. Server restarts up OK for a few minutes and the cycle repeats itself again & again. Reseated all drives, check fans in chassis and they are OK (turning). Can login to server to see logs before it powers itself down again. Suggestions any help is appreciated on resolving this problem. Thanks.

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  • Putting a thread to sleep until event X occurs

    - by tipu
    I'm writing to many files in a threaded app and I'm creating one handler per file. I have HandlerFactory class that manages the distribution of these handlers. What I'd like to do is that thread A requests and gets foo.txt's file handle from the HandlerFactory class thread B requests foo.txt's file handler handler class recognizes that this file handle has been checked out handler class puts thread A to sleep thread B closes file handle using a wrapper method from HandlerFactory HandlerFactory notifies sleeping threads thread B wakes and successfully gets foo.txt's file handle This is what I have so far, def get_handler(self, file_path, type): self.lock.acquire() if file_path not in self.handlers: self.handlers[file_path] = open(file_path, type) elif not self.handlers[file_path].closed: time.sleep(1) self.lock.release() return self.handlers[file_path][type] I believe this covers the sleeping and handler retrieval successfully, but I am unsure how to wake up all threads, or even better wake up a specific thread.

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  • server down "without reason"

    - by Nick
    I have a Lenny dedicated server at Hivelocity. My server went down today. They doesn't know why. I don't know why. MTRG shows 7Mbps before went the server goes offline, ddos not probably. Hardware failure? maybe. but now is running ok. hacked? maybe. lastlog, md5sum, rkhunter, syslog and auth.log seems ok. my load is always between 0.02 and 0.3, the server runs a small website but with 2million pageviews/day and never failed before. Where can I find more information in my logs? where I start looking?

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  • My wireless network slows down every 7.5 minutes when my desktop is switched on

    - by Dog Ears
    My network has lag spikes lasting for a few seconds every 7.5 mins. The spikes also effect any other computer connected connected to my wirless router at the time. My wife has to connect her laptop via a cable to prevent the lag causing problems when she's VPNing into her work. If I switch my PC off the problem goes away! I've got an Edimax 7728ln 802.11n wireless card and Speedtouch 585v7 (I'm with Be) I've Tried... Updated the drivers from Edimax website: 2.0.3.0 (it does say 3.0.2.0 in devices properties though) WLAN Optimizer doesn't seem to be helping What can I do?

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