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• Coldfusion 8 Application Crashes Under Heavy Load

  - by KM01

  Hello, We have a CF8 app that runs for 20-25 minutes before crashing under heavy load ~ 1200 users. This load is generated by our load testing tool: 1200 users ramped up in 5 mins (approx behavior of our users), running for an hour. We have this app on Solaris 10, Apache 2, JRun 4 and Oracle 10g. Java version is 1.6. During the initial load tests, the thread dumps pointed to monitor deadlocks that pointed to sessions. "jrpp-173": waiting to lock monitor 0x019fdc60 (object 0x6b893530, a java.util.Hashtable), which is held by "scheduler-1" "scheduler-1": waiting to lock monitor 0x026c3ce0 (object 0x6abe2f20, a coldfusion.monitor.memory.SessionMemoryMonitor$TopMemoryUsedSessions), which is held by "jrpp-167" "jrpp-167": waiting to lock monitor 0x019fdc60 (object 0x6b893530, a java.util.Hashtable), which is held by "scheduler-1" We increased the number of sessions relative to the number of CPUs (48 simultaneous threads against 32 CPUs), and the deadlock went away. While varying the simultaneous threads helped a little bit in terms of response time, the CF server still tanked in 20-25 minutes during all of these tests. We ran more thread dumps, and saw a thread locking a monitor, for e.g.: "jrpp-475" prio=3 tid=0x02230800 nid=0x2c5 runnable [0x4397d000] java.lang.Thread.State: RUNNABLE at java.util.HashMap.getEntry(HashMap.java:347) at java.util.HashMap.containsKey(HashMap.java:335) at java.util.HashSet.contains(HashSet.java:184) at coldfusion.monitor.memory.MemoryTracker.onAddObject(MemoryTracker.java:124) at coldfusion.monitor.memory.MemoryTrackerProxy.onReplaceValue(MemoryTrackerProxy.java:598) at coldfusion.monitor.memory.MemoryTrackerProxy.onPut(MemoryTrackerProxy.java:510) at coldfusion.util.CaseInsensitiveMap.put(CaseInsensitiveMap.java:250) at coldfusion.util.FastHashtable.put(FastHashtable.java:43) - locked <0x6f7e1a78> (a coldfusion.runtime.Struct) at coldfusion.runtime.CfJspPage._arrayset(CfJspPage.java:1027) at coldfusion.runtime.CfJspPage._arraySetAt(CfJspPage.java:2117) at cfvalidation2ecfc1052964961$funcSETUSERAUDITDATA.runFunction(/app/docs/apply/cfcs/validation.cfc:377) As you see in the last line above there were several references CFMs and CFCs, and the lines have "cflock" tags, which were scoped to the "application." We (the dev team) then changed them to be scoped to a "name". After more load tests, there is no locking going on and there no deadlocks, but now the application tanks in 7-10 minutes. We've gotten system, network and DB reports from the respective admins, and they are not being taxed; even watched the server stats with server monitor, top, prstat, ran sar reports, etc. So we believe it is an issue with the CF server or maybe the JVM. I am running out of ideas as to what else we can try. Disclaimer: I am not a CF developer or Admin. I am just running the load test, analyzing the reports, threads etc, and sharing the results with the dev and admin teams, and trying the next change, and so on. So far no dice. Has anyone run into something similar? How did you go about diagnosing and troubleshooting? All thoughts and pointers welcome. Thank you for your time! KM

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• SSH tuneling and machine selection

  - by Christophe Debove

  With putty on windows I added some tunnel for terminal service through ssh 6664 192.168.20.44:3389 6665 192.168.20.45:3389 6666 192.168.20.46:3389 So when I connect with client to 127.0.0.1:6664 it work... Now I want to use localtest.me to select the machine directly without port number. I want when I type foo.localtest.me in TS client to connect automaticaly on the 127.0.0.1:3389 is it possible or do I need a proxy to translate port regarding domain name.

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• putty output screen too small?

  - by iie

  I'm having strange problem with my putty console. I'm establishing connection over ssh to my home computer [ windows 7 + freesshd server ]. Everything works just fine, but I'm getting this tiny screen with output, I can resize it of course, but the content is still in small box [ content doesn't resize ] I've tried to change the number of columns and rows in properties, but it didn't change anything. The same thing is with cygwin client.

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• assign numbers to windows and use those to switch between them (gnome)

  - by rodrigo

  Hi, My workspace is very simple, just 4 windows (I have a dual display desktop), so I always have all my windows visible. What I would like to do is switch between them just using something like Windows+N where N is a number, so using Windows+1 would take me to the first window starting from the left and so on. Is this possible using gnome? thanks!

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• How to change shortcut keys in Thunderbird 3 for Linux?

  - by Josh

  I use Thunderbird on Ubuntu Linux and have just upgraded to Ubuntu 10 / Thunderbird 3. One of my gripes however is that Thunderbird uses a number of shortcut keys that have no secondary key requirements, for example, "Mark as Read" is M. Not ControlM. Just M. Worse, "Mark as Junk" is J. Which means I sometimes inadvertently mark messages as Junk. How can I customize Thunderbird's shortcuts so, for example, "Mark as Junk" is ControlJ?

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• SMB returns the entire file instead of header info

  - by billdlawson

  Starting a section of code checks for access to many data files (flat files so each table is a file) and when I do a packet capture, in our capture only the header info is sent by the server to the client. However I have one Customer who is using a SAN that gets the whole file instead of just the header info,and besides just being slower, this is causing file access issues. They have already turned off OPLOCKS at the server and at the workstations. This is not client server. The data files and the application reside on the server but the users run the application locally via a shortcut with a mapped drive or UNC. So when I simply select an option that prompts for a vehicle number, not tryng to select a record but rather simply verify the datafiles are accessible, that window opens in 1-2 seconds for me. When they do the same thing it takes 6-15 seconds after there several users are running the program. Maximum number of users is 15. The program has a lot of small modules, 800 .cob modules. So it is very chatty but these are datafiles. We have Wireshark captures that show he's pulling the whole file and we're just getting the header. Thier capture vs ours. We suspect the SAN. Has anyone ever heard of a SAN improperly interpreting runtime requests? So an SMB request. This is Acucobol-GT (now Microfocus). The application is written in COBOL. This is not a new program just a new problem. This is one customer of over a thousand who are otherwise running smoothly and we are totally stumped. All XP users, the server is Windows 2003 (with Virtual server) and I don't yet know the SAN info. Also we have many installations running virtual servers but only few on SANs or we just don't know it. This is not a network throught put issue, the load is less than 5% on the server and theer are no timeout or retransmits. PS If it wasn't for Wireshark I'd still be chasing my tail. An application trace file on thier installation just looks like they run slower. If you want the Wireshark trace file I can make it available. Thanks in advance - Please excuse my verbosity (word?) but I'm not sure what's relavent.

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• Stop currently running Windows screensaver from command line

  - by Peter Bridger

  I have a number of Scheduled Tasks running on a Windows machine, which is design to run stand alone and show useful information to the office. Part of it's use is to run a screensaver that itself shows useful information. There are some scheduled tasks which need to display information to the screen, however as the screensaver is running these messages can't be seen until the screensaver it manually deactivated. How can the currently running screensaver in Windows be deactivated from command script?

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• Live Screen Capture Broadcast FREE Software and Multiple Users

  - by azamsharp

  I am interested in teaching some students about the basic of technology and wanted to see if there are any free applications that can capture my screen activity and broadcast it live over the web. It should be able to support at least 50 students. The number might grow later.

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• No Connectivity to ESX guests on one server

  - by Sam Cogan

  I have a number of ESX servers hosting VM's, all but one of these works ok, however one server has a problem where any guests on not contactable over the network. The ESX hosts is contactable, is integrated int VCenter, and you can even live migrate VM's to and from this server, but any VM's on that server are unable to talk to the rest of the network. The VM's NIC is shown as Up and has the right IP configuration, and as soon as you move it back to another host it works fine.

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• I want to execute the commands in a loop at the same time, not one after another

  - by Felipe Alvarez

  I'd like to write a loop ('for') that will do some action 'X' number of times. But instead of performing the actions sequentially, one after another, I'd like them to execute simultaneously (in parellel at the same time). How can this be achieved? Script or a one liner are fine. example ONLY: for i in 1 2 3 4 5; do dd if=/dev/zero of=/tmp/disk$i bs=10M count=10; done

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• HDD,CD,DVD - how is sector id distinguishable from data?

  - by b-gen-jack-o-neill

  Hi, as titles says, how is sector id on HDD,CD-ROM and so distinguishable from data? I mean, when I want lets say sector #52, first, head goes to track where this sector should be, than it must wait some time to spin the desired sector above the reading head. But it must somehow recognize that its sector number, and not only data that say 52. So, how is this done? Thanks.

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• How many copies of files are needed by video server?

  - by Trilok

  A quick question. How many copies of the same movie are kept in a video server (a video streaming server)? Suppose a particular video is at max requested by 1000 users at the same instant of time, how many copies would be sufficient so that parallel streams can be provided to each user? Ideally 1 copy would solve the purpose, but what is the optimum number keeping the bandwidth and simultaneous access in mind?

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• HP StorageWorks P4500 G2 Manager Management

  - by MDMarra

  According to the documentation, a management group should have an odd number of managers greater than 1. I have a four node SAN consisting of P4500 G2s. I plan on having two clusters with two nodes each in this management group, i.e.: -Managent_Group1 -Cluster1 -Node1 -Node2 -Cluster2 -Node3 -Node4 Are there any issues running standard managers on Node1, Node2, and Node3? After reading the documentation, I'm still unclear about whether or not cluster membership matters in quorum consistency, or if they don't matter at all.

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• How to ignore error messages in bash on Ubuntu?

  - by pedro

  I'm trying to show the number of lines, words and characters of all configuration files in /etc/*conf (with command wc). How can I modify the command (or commandline) to not view the error messages?

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• what do the numbers in VERSIONs mean?

  - by Ehsan Mamakani

  I mean for example if a software has this number in its version 13.0.5 and another version has 13.0.5.1 or something like that what is that zero for?what does this zero show? Is there a rule for these numbers?

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• Is it possible to increase the size of mstsc's connection cache

  - by mollmerx

  On my windows box mstsc.exe caches the last ten hosts I connected to. However, I connect to about 15 on a regular basis, so increasing the number that the combobox remembers would be really welcome.

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• How does Visio 2013 justify the high price tag?

  - by AME

  I am starting a process documentation project at work and am searching for a tool to diagram workflows. I have come across a number of options, some of which are free/open source products, and then there's Microsoft's Visio 2013. How is the steeper price point of Visio justified when compared to free alternatives? Which "power" features make Visio the favorite choice of business analysts and other professionals?

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• grep - what arguments do you usually specify?

  - by meder

  My most common grep line is just.. grep -IRl "text" * However I'm kinda getting tired of retyping this over and over - is there some way I can make an alias command so that those arguments are always enabled? And, I was wondering what arguments you usually specify for text searching - my two arguments 'R' for recursion, 'I' for not including binary types like jpg/gif, and 'l' for line number seem a bit too minimal. Which arguments do you use?

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• Preparing laptops for theft

  - by ccook

  With a number of laptops out there the likelihood of one being stolen is high. What methods, preferably free, can be used to secure the data on the computers? The laptops do not have any special hardware on them, and generally keep their user data in a dropbox folder. One small step taken is to have the the dropbox folder encrypted by Windows 7. Any additional suggestions are greatly appreciated. The data in the dropbox folder is sensitive.

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• How to find who deleted a line from a file in a SVN repository?

  - by Ivan Petrushev

  Hello, I work on a very large project (10000+ versions) and sometimes it happened that I need to know who of the other users deleted some line in a file. Is there a way to do that that? I can do svn blame with revision number to check if a line exists in that revision, then see in which revision the line is gone and see who commited that revision, but that procedure is lame with that large project. Is there a smarter way to do that?

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• Error on table import

  - by Moazam Ali

  I am importing tables from my backup server to main server through import; all the tables import successfully but one table could not import and gives the error below. What should i do with it? error at destination for row number 2334233 errors encountered so far in this task : 1 could not allocate space for object 'operator_audit_trail' in database sens_ms because the 'sens_index' file group is full

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• SiliconMechanics - Good or Bad?

  - by AbLincon

  Has anyone purchased and managed servers from SiliconMechanics. I absolutely love the huge number of system configuration they offer and they unbelievable low cost. Are the servers designed well? Anyone have any experience using SiliconMechanics?

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• Programmatically assigning an existing ssl cert to a website in iis6 via powershell or vbscript

  - by dagda1

  Hi, I have the following powershell script that creates a new website in IIS6: https://github.com/dagda1/iis6/blob/master/create-site.ps1 Does anyone know how I can assign an existing ssl cert to the website? I know I can set the port number using adsutil.vbs like this: cscript adsutil.vbs set w3svc/xxx/securebindings ":443:somewhere.com" But I am drawing a big blank when it comes to assigning an existing ssl certificate. Thanks Paul

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• Linux per-process resource limits - a deep Red Hat Mystery

  - by BobBanana

  I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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• Determine Apche version on Windows?

  - by Nathan Long

  I've got Apache installed on Windows. The folder name indicates that it's Apache 2.2, but I want to see the full version number. How can I do that?

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