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  • Parallelism on two duo-core processor system

    - by Qin
    I wrote a Java program that draw the Mandelbrot image. To make it interesting, I divided the for loop that calculates the color of each pixel into 2 halves; each half will be executed as a thread thus parallelizing the task. On a two core one cpu system, the performance of using two thread approach vs just one main thread is nearly two fold. My question is on a two dual-core processor system, will the parallelized task be split among different processor instead of just utilize the two core on one processor? I suppose the former scenario will be slower than the latter one simply because the latency of communicating between 2 CPU over the motherboard wires. Any ideas? Thanks

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  • Configure IIS Web Site for alternate Port and receive Access Permission error

    - by Andrew J. Brehm
    When I configure IIS to run a Web site on Port 1414, I get the following error: --------------------------- Internet Information Services (IIS) Manager --------------------------- The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) However, as according to netstat the port is not in use. Completely aside from IIS, I wrote a test program (just to open the port and test it): TcpListener tcpListener; tcpListener = new TcpListener(IPAddress.Any, port); try { tcpListener.Start(); Console.WriteLine("Press \"q\" key to quit."); ConsoleKeyInfo key; do { key = Console.ReadKey(); } while (key.KeyChar != 'q'); } catch (Exception ex) { Console.WriteLine(ex.Message); } tcpListener.Stop(); The result was an exception and the following ex.Message: An attempt was made to access a socket in a way forbidden by its access permissions The port was available but its "access permissions" are not allowing me access. This remains after several restarts. The port is not reserved or in use as far as I know and while IIS says it is in use, netstat and my test program say it is not and my test program receives the error that I am not allowed to access the port. The test program ran elevated. The IIS Site is running MQSeries, but the MQ listener also cannot start on port 1414 because of this issue. A quick search of my registry found nothing interesting for port 1414. What are socket access permissions and how can I correct mine to allow access?

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  • Setting up port forwarding for 7000 appliance VM in VirtualBox

    - by uejio
    I've been using the 7000 appliance VM for a lot of testing lately and relied on others to set up the networking for the VM for me, but finally, I decided to take the dive and do it myself.  After some experimenting, I came up with a very brief number of steps to do this all using the VirtualBox CLI instead of the GUI. First download the VM image and unpack it somewhere.  I put it in /var/tmp. Then, set your VBOX_USER_HOME to some place with lots of disk space and import the VM: export VBOX_USER_HOME=/var/tmp/MyVirtualBoxVBoxManage import /var/tmp/simulator/vbox-2011.1.0.0.1.1.8/Sun\ ZFS\ Storage\ 7000.ovf (go get a cup of tea...) Then, set up port forwarding of the VM appliance BUI and shell:First set up port as NAT:VBoxManage modifyvm Sun_ZFS_Storage_7000 --nic1 nat Then set up rules for port forwarding (pick some unused port numbers):VBoxManage modifyvm Sun_ZFS_Storage_7000 --natpf1 "guestssh,tcp,,4622,,22"VBoxManage modifyvm Sun_ZFS_Storage_7000 --natpf1 "guestbui,tcp,,46215,,215" Verify the settings using:VBoxManage showvminfo Sun_ZFS_Storage_7000 | grep -i nic Start the appliance:$ VBoxHeadless --startvm Sun_ZFS_Storage_7000 & Connect to it using your favorite RDP client.  I use a Sun Ray, so I use the Sun Ray Windows Connector client: $ /opt/SUNWuttsc/bin/uttsc -g 800x600 -P <portnumber> <your-hostname> & The portnumber is displayed in the output of the --startvm command.(This did not work after I updated to VirtualBox 4.1.12, so maybe at this point, you need to use the VirtualBox GUI.) It takes a while to first bring up the VM, so please be patient. The longest time is in loading the smf service descriptions, but fortunately, that only needs to be done the first time the VM boots.  There is also a delay in just booting the appliance, so give it some time. Be sure to set the NIC rule on only one port and not all ports otherwise there will be a conflict in ports and it won't work. After going through the initial configuration screen, you can connect to it using ssh or your browser: ssh -p 45022 root@<your-host-name> https://<your-host-name>:45215 BTW, for the initial configuration, I only had to set the hostname and password.  The rest of the defaults were set by VirtualBox and seemed to work fine.

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  • Are there references discussing the use parallel programming as a development methodology? [closed]

    - by ahsteele
    I work on a team which employs many of the extreme programming practices. We've gone to great lengths to utilize paired programming as much as possible. Unfortunately the practice sometimes breaks down and becomes ineffective. In looking for ways to tweak our process I came across two articles describing parallel pair programming: Parallel Pair Programming Death of paired programming. Its 2008 move on to parallel pairing While these are good resources I wanted to read a bit more on the topic. As you can imagine Googling for variations on parallel pair programming nets mostly results which relate to parallel programming. What I'm after is additional discussion on the topic of parallel pair programming. Do additional references exist that my Google-fu is unable to discern? Has anyone used the practice and care to share here (thus creating a reference)?

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  • How to you solve the problem of implicit locking and parallel execution?

    - by Eonil
    Where the code is: function A() { lock() doSomething() unlock() } We can call A safely from multiple threads, but it never be executed in parallel . For parallel execution, we have to evade all of this code. But the problem is we never know the A is getting lock or not. If we have source code (maybe lucky case), we have to decode all code to know locking is happening or not. This sucks. But even worse is we normally have no source code. It's obvious this kind of hidden locks will become bottleneck of parallel execution even all the other parts are designed for parallel. And also, (1) With locks, execution cannot be parallel. (2) And I can't know whether the locks are used or not in any code. (3) Defensively, I can't make parallel anything! This facts drives me crazy. How do you solve this problem?

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  • How to break out of a nested parallel (OpenMP) Fortran loop idiomatically?

    - by J.F. Sebastian
    Here's sequential code: do i = 1, n do j = i+1, n if ("some_condition") then result = "here's result" return end if end do end do Is there a cleaner way to execute iterations of the outer loop concurrently other than: !$OMP PARALLEL private(i,j) !$OMP DO do i = 1, n if (found) goto 10 do j = i+1, n if (found) goto 10 if ("some_condition") then !$OMP CRITICAL !$OMP FLUSH if (.not.found) then found = .true. result = "here's result" end if !$OMP FLUSH !$OMP END CRITICAL goto 10 end if end do 10 continue end do !$OMP END DO NOWAIT !$OMP END PARALLEL

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  • What Parallel computing APIs take good use of sockets?

    - by Ole Jak
    What Parallel computing APIs take good use of sockets? So my programm uses soskets, what Parallel computing APIs I can use that would help me but will not obligate me to go from sockets to anything else... I mean when we are on claster with some special, not socket infrastructure sistem that API emulates something like socket but uses that infrustructure (so programm peforms much faster then on sockets, but keeps having nice soskets API)

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  • Use Dynamic DNS to access Java servlet, still need port forward ?

    - by Frank
    If I use Dynamic DNS such as the free service at https://www.dyndns.com, do I still need to set up static IP and do port forward ? I have a DSL, most likely with dynamic IP address, and I run a Java servlet to get Paypal IPN messages on my notebook, in order for the messages to reach my notebook, I : [1] set up static IP and [2] did port forwarding. But I found each time the PC re-starts, it has a different external IP, so I was suggested to [3] get Dynamic DNS service like the free one mentioned above, but now I'm a bit confused, if I have step [3], do I still need to do [1] and [2], isn't step [3] supposed to do [1] and [2] for me ? But since I've already done [1],[2], now I wonder if they would cause trouble for step [3], do I need to undo them ? Or do I need all of them together ?

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  • Website running on Tomcat port 8443 will only resolve with IP address, not dns

    - by littleK
    I recently set up a web server running tomcat 7 on Ubuntu 12.04. It is currently running on port 8080, however I just enabled SSL on port 8443. Here's my problem: For port 8080, the website is resolved with DNS: (http://www.mywebpage.com:8080) For port 8443, I can only access the website with the IP Address (http://0.0.0.0:8443). It will not work if I use the DNS name. I ultimately want to disable port 80 and use port 8443 only. Does anyone know why I cannot resolve the website on port 8443 using DNS, and how I might fix it? Thanks!

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  • Forward one RDP port on one machine to multiple external users at the same time

    - by matnagel
    We have a windows server 2003 machine with rdp service listening on the standard port 3389. For security reasons this port is not opened on the router, but we have freesshd service running and a remote admin can login via ssh and this port is forwarded to external port 33001 for the first external user. This works great. Now we have another admin who wants to work remote (he uses a different windows account, but needs to work on the same machine.) So this is basically a ssh port forwarding question. Will the other user be able to login at the same time using the same port 33001 ? Please keep in mind that there will be a second tunnel, and this second tunnel will also use the local port 3389 on the windows server.

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  • How long will the serial port be around for?

    - by Andy
    It seems that the serial port has a remarkable ability to stick around. You might call it the hardware equivalent of Windows XP. Despite pretty much physically disappearing from laptops and the like, the need to use a serial port still exists, even if it means using a converter of some sort. It is very much a legacy piece of hardware, and yet so many devices and instruments still use it. I use it myself daily in my work with PLC's, HMI's, barcode readers, etc. In my opinion, I don't think it is going anywhere soon, but how long do you think it has got before joining the museum? Do you think it ever will?

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  • What port should I use for my reverse proxy to Apache 2 from nginx?

    - by meder
    I have nginx setup as the defacto port 80. I want to setup django+mod_wsgi on Apache2. I'm worried if I leave Apache2 as 80 it will cause a conflict. Is it better to avoid the headache and change Apache to a different port? server { listen 80; server_name work.domain.org; access_log /www/work.domain.org/log/access.log; error_log /www/work.domain.org/log/error.log; location / { proxy_pass http://127.0.0.1:8080/; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Magic-Header "secret"; client_max_body_size 10m; } }

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  • Access port on machine by connecting to other machine via SSH?

    - by piquadrat
    I have to access my home router's web interface on port 80. Unfortunately, the only way into the network I have at the moment is SSH to another machine on the same network. me ---|---SSH Box----Home Router My Google foo seems to have abandoned me, I couldn't didn't find anything helpful. Any ideas? Thanks! To clarify: I'm not at home right now. I do however have access to one machine on the network (a QNAP NAS) over SSH. I need to access the home router web interface on port 80 from my notebook which is outside of the home network.

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  • Vlan Tagging at Access Port in Switch

    - by singh
    I'm Confused from the fact that Vlan tagging is done at access port and trunk port always gets tagged packets (until its case of native vlan).But I still believe in other fact which says tagging happen only when a frame hit the trunk port which means trunk port gets untagged frame and tagging is not possible at access port. Would like to know where actually this tagging happens ? and also which command we can use to encapsulate 802.1q protocol to access port ? The way we do at trunk port is switchport trunk encapsulation dot1q Is the above command applicable for access mode also?

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  • Open ports broken from internal network

    - by ksvi
    Quick summary: Forwarded port works from the outside world, but from the internal network using the external IP the connection is refused. This is a simplified situation to make the explanation easier: I have a computer that is running a service on port 12345. This computer has an internal IP 192.168.1.100 and is connected directly to a modem/router which has internal IP 192.168.1.1 and external (public, static) IP 1.2.3.4. (The router is TP-LINK TD-w8960N) I have set up port forwarding (virtual server) at port 12345 to go to port 12345 at 192.168.1.100. If I run telnet 192.168.1.100 12345 from the same computer everything works. But running telnet 1.2.3.4 12345 says connection refused. If I do this on another computer (on the same internal network, connected to the router) the same thing happens. This would seem like the port forwarding is not working. However... If I run a online port checking service on my external IP and the service port it says the port is open and I can see the remote server connecting and immediately closing connection. And using another computer that is connected to the internet using a mobile connection I can also use telnet 1.2.3.4 12345 and I get a working connection. So the port forwarding seems to be working, however using external IP from the internal network doesn't. I have no idea what can be causing this, since another setup very much like this (different router) works for me. I can access a service running on a server from inside the network both through the internal and external IP.

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  • Router behind Router--second router (and its clients) cannot be "seen" even after both routers are D

    - by Trioke
    Couple of terminology I guess I should get out of the way for consistency's sake throughout the post: External Router/Modem - SMC 8014WG - External IP 173.32.144.134 - Internal IP 192.168.0.1 Internal Router - LinkSys WRT120N - "External" IP of 192.168.0.175 - Internal IP 192.168.1.1 - Connected via Ethernet Cable (a really long one, from the basement to the second floor) PC - IP 192.168.200 - Connected Wirelessly via WAP2 Personal. Laptop - Used to try and diagnose the problem, a 4th machine to the setup which won't be part of the final setup once everything works. The actual problem: I've tried setting the LinkySys router as a DMZ'd client on the SMC router, and then DMZ'd the actual PC on the LinkSys. So the DMZ looks like this: On the SMZ, client with IP 192.168.0.175 is DMZ'd. On the LinkSys, client with IP 192.168.1.200 is DMZ'd. No dice. I then tried port forwarding the necessary port on the SMC to the LinkSys (lets just say, port 80). Then port forwarded Port 80 on the LinkSys to the PC. Same as the DMZ scenario above, but change DMZ with port forwarding. No dice, still :(. Now here's where I went stupid--and tell me if one should never do this--I enabled both DMZ and port forwarding at the same time. I fired up Opera--my browser of choice ;)--typed in 173.32.144.134:6333 and... ... Third time is the charm they say? Well, clearly not. Otherwise I wouldn't be here ;). To diagnose the problem, I enabled "Allow remote access to the Admin panel" on the LinkSys router, and specified port 6333 as the port to use. I port forwarded port 6333 on the SMC to 192.168.0.175, and access my external IP of 173.32.144.134:6333 in hopes of seeing the Admin panel... No dice (I think I've ran out of dice by now ;)). So to see where the problem was, I connected a laptop to the SMC via LAN cable, and typed in 192.168.0.175:6333, and viola, Admin Panel access! So the problem looks like it lies with the SMC--But that's as far as I've got, I've done the port forwarding, the DMZ'ing, and I've even disabled the built-in firewall for safe measures, but nothing worked. So, here I am. Unable to connect to the PC behind the Internal router externally, and without anything to go on other than to come here and ask for the wisdom of the the superuser folks :). If any more detail is required, just ask. (Apologies in advance, if questions should never be this long winded!)

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  • Hosting website when port 80 is taken?

    - by cinqoTimo
    A few months ago, we purchased an R-HUB unit to replace WebEx for remote support. The device operates through port 80, ehich doesn't appear to be configurable. I know in IIS, you can specify a port besides port 80, but the problem is in the port forwarding. On our router, we have to map an incoming port to the forward port which then directs traffic to the node (webserver). However, the incoming port for both the webserver and the R-HUB is 80 - and the server seems to be getting confused as I can only get to the R-HUB, not the website. How can I expose both devices? Host header headers? DNS config?

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  • Server IP must be a LAN IP (Port Forwarding Netgear Router)? [closed]

    - by rphello101
    I'm trying to set up a server (Apache) on my computer (fairly new to it). As I understand it, for it to be accessible to other computers, I need to forward port 80. When I try to forward the port though, I get the error: Server IP must be a LAN IP. I noticed in ipconfig that my default gateway is different than my wireless router. My computer is not hardwired, not on WiFi. Furthermore, I do not, at this point, have a static IP. I read that it should still work with a dynamic IP until it changes. Any ideas on what I can do? I'm using Windows 7 in case it matters.

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  • Port listening on localhost:8000 but not on ip:8000

    - by Marionette
    Hello I'm running a web application on port 8000. When I access it from the host server localhost:8000 it responds ok, 127.0.0.1:8000 also works, but 192.168.1.7:8000 does not work. 192.168.1.7 is the ip of my server. Also if i try to go to another web application running on port 80 it works 192.168.1.7 I enabled ufw firewall and set ufw default allow. I am using ubuntu server 12.04 Any suggestions on why I can't get to my app on port 8000 using the ip-address:8000? Thanks in advance!

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  • Apache wont work after changing port

    - by user73595
    I am working with ubuntu 12.04 server 64-bit edition. I have intalled apache2 without any problems and i can see the "It works" message. And i can also access from other pc within the network. I want to host my website using home DSL, However i found out that my ISP is blocking the port 80, 25 ,110 so i changed the port to 8010 (/etc/apache2/port.conf) After this I am unable to get the "It Works" web page. All it shows that "NOT FOUND" i tried with ipaddress:8010 and it doesnot work with both internal and also external.

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  • HDMI port not recognized on Sony Vaio

    - by julio
    I am running Ubuntu 11.10 64bit with a Sony VAIO VPC F11. It has an NVIDIA GeForce 310M video card, with the latest Nvidia drivers for the 64 bit linux, and a Windows partition with Win7 64bit. NVIDIA driver version is NVIDIA-Linux-x86_64-280.13 External monitor is Samsung SyncMaster P2770 If I boot into the Windows partition, the HDMI works as expected, with sound and video-- under linux, the HDMI port is not recognized at all, apparently, and provides no signal to the attached monitor. The nividia-settings tool does not recognize any monitor connected to the HDMI port. Disper is installed and cannot recognize an attached external monitor. Can anyone help me diagnose this issue and fix it if possible? The laptop has only the one HDMI port to connect any external monitor, so it I can't get this working I'm stuck using either the laptop screen or Windows. Thanks

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  • How do I open port 51413 for Transmission?

    - by user94159
    Just moved to ubuntu on my macbook and spend whole day trying to open transmission port 51413. Already done: I have ufw but i opened ports there and tried without it - probably not the problem 51413/tcp ALLOW Anywhere 51413/tcp ALLOW Anywhere (v6) 21/tcp ALLOW OUT Anywhere 80 ALLOW OUT Anywhere 143 ALLOW OUT Anywhere 2049 ALLOW OUT Anywhere 110 ALLOW OUT Anywhere 135,139,445/tcp ALLOW OUT Anywhere 137,138/udp ALLOW OUT Anywhere 25/tcp ALLOW OUT Anywhere 631 ALLOW OUT Anywhere 443/tcp ALLOW OUT Anywhere 53/udp ALLOW OUT Anywhere 123/udp ALLOW OUT Anywhere 993/tcp ALLOW OUT Anywhere 465/tcp ALLOW OUT Anywhere 51413/tcp ALLOW OUT Anywhere router Pirelli DRG A125G; tried disabling firewall, forwarding ports according portforward.com but I have no experience with such thing so I dont know if i succeeded On transmission still shows port blocked and nothing is downloading... CanYouSeeMe.org tried tu use to see if ports are open but it shows that port is blocked Also tried qbitorrent it also doesnt work

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  • Connecting to VPN / proxy with different port number

    - by user779159
    I have an IP address, port, username, and password for one of those VPN / proxy services that allows you to use an IP address other than what your ISP gives you, but in the 'Edit Connections VPN' GUI I don't see where to enter a port. I enter the IP address under 'Gateway' and the username and password where it asks for it, but it doesn't work. I try to enter it with the IP address ending with a colon, followed by the port, but that doesn't work either (e.g. "1.1.1.1:9999"). Any idea how I could make it work? I'm using Ubuntu 12.04 LTS. Thanks.

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  • Re-Route Mail to a port other than 25

    - by Ken
    Is there a way to route mail to another port? I have an email account attached to my laptop that I'd like to be able to send and receive mail from. Due to mobility, I'll be passing through various networks that will probably block this port. My dynamic DNS provider allows me to utilize web-forwards for MX domains; is this possible? where I can web forward to a domain:port which is managed by my DNS provider when I traverse between networks. If not, is there a way? Of course i could use web-mail or relay-forwarding from my home server, but that's not geeky enough.

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