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  • extreme slowness with a remote database in Drupal

    - by ceejayoz
    We're attempting to scale our Drupal installations up and have decided on some dedicated MySQL boxes. Unfortunately, we're running into extreme slowness when we attempt to use the remote DB - page load times go from ~200 milliseconds to 5-10 seconds. Latency between the servers is minimal - a tenth or two of a millisecond. PING 10.37.66.175 (10.37.66.175) 56(84) bytes of data. 64 bytes from 10.37.66.175: icmp_seq=1 ttl=64 time=0.145 ms 64 bytes from 10.37.66.175: icmp_seq=2 ttl=64 time=0.157 ms 64 bytes from 10.37.66.175: icmp_seq=3 ttl=64 time=0.157 ms 64 bytes from 10.37.66.175: icmp_seq=4 ttl=64 time=0.144 ms 64 bytes from 10.37.66.175: icmp_seq=5 ttl=64 time=0.121 ms 64 bytes from 10.37.66.175: icmp_seq=6 ttl=64 time=0.122 ms 64 bytes from 10.37.66.175: icmp_seq=7 ttl=64 time=0.163 ms 64 bytes from 10.37.66.175: icmp_seq=8 ttl=64 time=0.115 ms 64 bytes from 10.37.66.175: icmp_seq=9 ttl=64 time=0.484 ms 64 bytes from 10.37.66.175: icmp_seq=10 ttl=64 time=0.156 ms --- 10.37.66.175 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 8998ms rtt min/avg/max/mdev = 0.115/0.176/0.484/0.104 ms Drupal's devel.module timers show the database queries aren't running any slower on the remote DB - about 150 microseconds whether it's the local or the remote server. Profiling with XHProf shows PHP execution times that aren't out of whack, either. Number of queries doesn't seem to make a difference - we seem the same 5-10 second delay whether a page has 12 queries or 250. Any suggestions about where I should start troubleshooting here? I'm quite confused.

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  • Web Services for Info Explorer Zones

    - by Anthony Shorten
    One of the most interesting uses for XAI and Configurable objects is the exposure of a query portal as a Web Service. Let me illustrate this with an example. Say you have an interface that requires a list of data from a number of product tables. In the past you would have to build a java program to do this with SQL then use an application service but it is now possible with just configuration. The first step in the process is to create the SQL you want to use for the interface. It can be any valid static SQL or use host variables for the WHERE clause (we call that filtered). Once you are happy with the SQL (and it performs acceptably) you can incorporate that SQL into a Info-Explorer Zone. You can use any of the explorer zone types but I typically recommend F1-DE-SINGLE as it supports a single SQL statement with multiple filters (up to 15) as well as hidden filters (up to 5). Hidden filters are typically not displayed in the UI for criteria (remember explorer zones can be used on the user Interface as well) but for web services they can be used as normal filters (this means you can use up to 20 filters all up). Once you are happy with the zone, you now need to define it as a Business Service. We have a generic service called FWLZDEXP which allows a explorer zone to be defined as a Business Service. If you open any Business Service based upon FWLZDEXP you will see some examples. The schema is standard and pretty self explanatory in terms of the structure. The schema pattern looks like this: Zone element - maps to the ZONE_CD element and the default value is the zone name you just created. This links the business service to the zone. Filter elements - You name the filters as you like but the mapField is set to Fx_VALUE where x is the filter number corresponding to the filter element in the zone definition. Hidden filter elements - You name the filters as you like but the mapField is set to Hx_VALUE where x is the filter number corresponding to the hidden filter element in the zone definition. results group - this holds the elements of the result set. Each element in your result set has a tagname and is linked to the COL_VALUE mapField and the row element is lists the SEQNO of the column. This corresponds to the column number in the results set in the zone. An example schema is shown below for the F1-USGRACML zone, which returns the access modes for a user group and application service filters. In the example, the userGroup and applicationService elements are the filters and the rows would contain a list of accessModeDescr. This is just a simple example to illustrate the point. There are lots of examples in the product that you can investigate. One recommendation, to save time, is that you copy the schema from one of the examples to save you typing it from scratch. You can simply modify the tags and other elements to suit your needs. Once the Business Service is defined it can simply be defined as a Web Service by registering an XAI Inbound Service using the Business Service definition as a basis. You now have a Web Service based upon a Info Explorer Zone. This is one of my favorite components as it allows interfaces to be simplified. This will be my last blog entry for this year. I hope you all have a great and safe Christmas and an even greater new year. Next year promises to be an exciting year and I look forward to communicating exciting developments we are working on at the moment as they are released.

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  • Better way to design a database

    - by cMinor
    I have a conceptual problem and I would like to get your ideas on how I'll be able to do what I am aiming. My goal is to create a database with information of persons who work at a place depending on their profession and skills,and keep control of salary and projects (how much would cost summing all the hours of work) I have 3 categories which can have subcategories: Outsourcing Technician welder turner assistant Administrative supervisor manager So each person has its information and the projects they are working on, also one person may do several jobs... I was thinking about having 5 tables (EMPLOYEE, SKILLS, PROYECTS, SALARY, PROFESSION) but I guess there is a better way of doing this. create table Employee ( PRIMARY KEY [Person_ID] int(10), [Name] varchar(30), [sex] varchar(10), [address] varchar(10), [profession] varchar(10), [Skills_ID] int(10), [Proyect_ID] int(10), [Salary_ID] int(10), [Salary] float ) create table Skills ( PRIMARY KEY [Skills_ID] int(10), FOREIGN KEY [Skills_name] varchar(10) REFERENCES Employee(Person_ID), [Skills_pay] float(10), [Comments] varchar(50) ) create table Proyects ( PRIMARY KEY [Proyect_ID] int(10), FOREIGN KEY [Skills_name] varchar(10) REFERENCES Employee(Person_ID) [Proyect_name] varchar(10), [working_Hours] float(10), [Comments] varchar(50) ) create table Salary ( PRIMARY KEY [Salary_ID] int(10), FOREIGN KEY [Skills_name] varchar(10) REFERENCES Employee(Person_ID) [Proyect_name] varchar(10), [working_Hours] float(10), [Comments] varchar(50) ) So to get the total amount of the cost of a project I would just sum the working hours of each employee envolved and sum some extra costs in an aggregate query. Is there a way to do this in a more efficient way? What to add or delete of this small model? I guess I am missing something in the salary - maybe I need another table for that?

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  • OpenVPN: ifup tap0 drops all connections

    - by raspi
    I'm trying to create star shaped "virtual" LAN with OpenVPN which is not connected to physical network. ie. tap0 packets should not go to eth0. Packet should only go through OpenVPN to connected clients. This setup works with my OpenVPN testing machine which runs Virtual Box but not on my actual server which is running on top of Xen. Both servers are running Ubuntu Intrepid. /etc/network/interfaces: iface tap0 inet manual address 10.10.10.1 netmask 255.255.255.0 gateway 10.10.10.1 /etc/openvpn/server.conf mode server tls-server port 1194 proto udp dev tap client-to-client ca /etc/openvpn/easy-rsa/keys/ca.crt cert /etc/openvpn/easy-rsa/keys/servername.crt key /etc/openvpn/easy-rsa/keys/servername.key dh /etc/openvpn/easy-rsa/keys/dh384.pem ifconfig-pool-persist ipp.txt server-bridge 10.10.10.1 255.255.255.0 10.10.10.128 10.10.10.250 push .route 10.10.10.1 255.255.255.0 keepalive 5 60 comp-lzo persist-key persist-tun status /var/log/openvpn-status.log log-append /var/log/openvpn.log verb 3 user nobody group nogroup ifup tap0 on Virtual Box: everything ok, SSH keeps running. But on Xen SSH connection drops and I have to reboot whole machine. What I'm missing?

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  • illegitimate traffic from user agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)

    - by user114293
    Since the beginning of the year, I'm getting a lot of traffic with the user agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729). My access logs show 40% - 60% from that user agent. That's strange because the user agent states a Firefox 3.0.10 browser (is anybody using that browser in 2012? Definitely not 40%-60% of visitors on a normal website). Also, the logs show that this user agent only requested the HTML document and no referenced assets like images, css, js files. I checked the IPs of those requests (with that UA). It's coming from all over the world. I recognized that those IPs sometimes have a mobile user agent. So my suspicion is a mobile app that is doing a lot of "spider requests" - but if that would be the case than other web sites should have the same problem. That's actually my question: Does anybody experience same/similar problems?

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  • I want to access internet on ubuntu 12.04.1 guest system from windows 7 64bit host in virtualbox 4.1.18 How to do so?

    - by Rohit
    I am using Windows 7 64bit as host system and i have installed ubuntu 12.04.1 in virtual box as stated above. I have a dsl connection which works well on my host system and now I need to access the same connection on my guest ubuntu. I cant see any such settings in ubuntu. I am total biginner and dont know anything about linux. Win 7 is showing unknown network. Please guide me from the scratch. Thank you.

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  • What would you do if there was no Internet? [closed]

    - by Jinjavajin
    If the International Network no longer functioned how would programmers cope? Would software development become an intractable problem? So much development has been achieved because of our interconnectivity that we might not be able to go forward as a community, without it. Is this the case, or might we become more productive due to the removal of a major distraction? How would we cope if the the network went down?

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  • When and why would Windows Explorer lock an external hard disk?

    - by Ngu Soon Hui
    I am quite surprised to see that Windows Explorer is locking my external hard disk. Is there any reason why explorer.exe is holding on to my external hard disk? Before I was trying to detach the external hard disk, I was opening a csproj file using Visual Studio 2008. I made sure that I closed down Visual Studio before trying to detach the external hard disk. There was no other active program except Google Chrome, from what I could see, that was running.

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  • Why does my Windows Explorer no longer refresh itself?

    - by Markus
    Normally when you do a file operation in Windows Explorer then Explorer refreshes itself. So I delete a file, and it's gone. But since yesterday when I for example delete a file, the file entry doesn't disappear. It only disappears when closing and reopening the folder, or when pressing F5. What could that be?

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  • Context menu opens slowly in Explorer in Windows 7, why?

    - by xxzoid
    I'm running a Windows 7 on my reasonably modern laptop, when I open the context menu in Windows Explorer it really takes it time to show up (~10 seconds). There are some programs that have their commands added to it (an archive manipulation utility, an antivirus, a version control system and such). I think one of them freezes the operation. Is there a benchmark tool to measure it somehow or a tool to turn them off by one in Explorer without uninstalling them (which would be a penultimate measure, because use them)?

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  • OpenVPN on Tomato and Vista - can't see my network

    - by Ian
    I followed the instructions here (http://todayguesswhat.blogspot.ca/2011/03/quick-simple-vpn-setup-guide-using.html) to set up a TCP connection to OpenVPN on my Tomato router. Used TCP because the place I usually surf at seems to have the other ports blocked. My Vista laptop is able to connect to the router but I don't appear to be getting an IP address. I'm able to access my router's admin page, but I can't see the network at home. When I browse to Whatsmyip I see my home IP. Here are the results of route print -4 when I'm just connect to the library and when I've fired up the VP connection as well: Library only: =========================================================================== Interface List 22 ...00 ff c4 a0 e7 5c ...... TAP-Win32 Adapter V9 15 ...00 23 4e 20 b3 64 ...... Atheros AR9281 Wireless Network Adapter 10 ...00 23 8b 39 ec 71 ...... Marvell Yukon 88E8040T PCI-E Fast Ethernet Controller 1 ........................... Software Loopback Interface 1 11 ...00 00 00 00 00 00 00 e0 isatap.{834A8A0A-5E2C-47D0-9673-7965DE8B5470} 14 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface 17 ...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3 20 ...00 00 00 00 00 00 00 e0 6TO4 Adapter 18 ...00 00 00 00 00 00 00 e0 6TO4 Adapter 19 ...00 00 00 00 00 00 00 e0 6TO4 Adapter 23 ...00 00 00 00 00 00 00 e0 isatap.{C4A0E75C-765E-4F7D-A55C-77945779816A} 34 ...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #5 =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.1.29.1 10.1.29.117 25 10.1.29.0 255.255.255.0 On-link 10.1.29.117 281 10.1.29.117 255.255.255.255 On-link 10.1.29.117 281 10.1.29.255 255.255.255.255 On-link 10.1.29.117 281 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 10.1.29.117 281 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 10.1.29.117 281 =========================================================================== Library and TCP OpenVPN: IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.1.29.1 10.1.29.117 25 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.116 30 0.0.0.0 128.0.0.0 192.168.1.1 192.168.1.116 30 10.1.29.0 255.255.255.0 On-link 10.1.29.117 281 10.1.29.117 255.255.255.255 On-link 10.1.29.117 281 10.1.29.255 255.255.255.255 On-link 10.1.29.117 281 24.212.205.68 255.255.255.255 10.1.29.1 10.1.29.117 25 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 128.0.0.0 128.0.0.0 192.168.1.1 192.168.1.116 30 192.168.1.0 255.255.255.0 On-link 192.168.1.116 286 192.168.1.116 255.255.255.255 On-link 192.168.1.116 286 192.168.1.255 255.255.255.255 On-link 192.168.1.116 286 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.1.116 286 224.0.0.0 240.0.0.0 On-link 10.1.29.117 281 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.1.116 286 255.255.255.255 255.255.255.255 On-link 10.1.29.117 281 =========================================================================== Thanks for any advice. I looked at one of the answers but I'm not sure if it applied to me as it said that 10...* was the vpn connection, but I appear to have 10...* when I connect just to the library.

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  • Too many Bind query (cache) denied, DNS attack?

    - by Jake
    Once Bind crashed and I did: tail -f /var/log/messages I see a massive number of logs every second. Is this a DNS attack? or is there something wrong? Sometimes I see a domain in logs like this: dOmAin.com (upper and lower). As you see there is only one single domain in the logs with different IPs Oct 10 02:21:26 mail named[20831]: client 74.125.189.18#38921: query (cache) 'ns1.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.144.171#38833: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.17#42428: query (cache) 'ns2.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.27#37899: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 193.203.82.66#39263: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.170#59723: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 80.169.197.66#32903: query (cache) 'dOmAin.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 134.58.60.1#47558: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.34#47387: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.8#59392: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.19#64395: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 217.72.163.3#42190: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 83.146.21.252#22020: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 192.221.146.116#57342: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 193.203.82.66#52020: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 8.0.16.72#64317: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 80.169.197.66#31989: query (cache) 'dOmAin.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.18#47436: query (cache) 'ns2.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 74.125.189.16#44005: query (cache) 'ns1.domain2.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 85.132.31.10#50379: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 94.241.128.3#60106: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 85.132.31.10#59118: query (cache) 'domain.com/A/IN' denied Oct 10 02:21:26 mail named[20831]: client 212.95.135.78#27811: query (cache) 'domain.com/A/IN' denied /etc/resolv.conf ; generated by /sbin/dhclient-script nameserver 4.2.2.4 nameserver 8.8.4.4 Bind config: // generated by named-bootconf.pl options { directory "/var/named"; /* * If there is a firewall between you and nameservers you want * to talk to, you might need to uncomment the query-source * directive below. Previous versions of BIND always asked * questions using port 53, but BIND 8.1 uses an unprivileged * port by default. */ // query-source address * port 53; allow-transfer { none; }; allow-recursion { localnets; }; //listen-on-v6 { any; }; notify no; }; // // a caching only nameserver config // controls { inet 127.0.0.1 allow { localhost; } keys { rndckey; }; }; zone "." IN { type hint; file "named.ca"; }; zone "localhost" IN { type master; file "localhost.zone"; allow-update { none; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "named.local"; allow-update { none; }; };

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  • Downloading an android layout from the internet.

    - by oscarello
    Hi, I would like ask if there's a way to download an android layout from the Internet into the "res/layout" folder. I was thinking in getting the file using an HttpUrlConnection and a FileOutputStream, like discussed in here http://stackoverflow.com/questions/576513/android-download-binary-file-problems but I can't fgure out how to put it into the "res/layout" folder. Thanks!

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  • Ubuntu hard disk problem

    - by Henadzy
    Hello! I have got the error with a hard disk on Ubuntu 9.10. It slows down my system, applications have not been responding for a long time. But when I mount and use filesystem which placed on this hard disk at other computer it works properly. disk: SAMSUNG HD161HJ (SATA) syslog: Apr 25 00:28:25 vare6gin kernel: [ 885.773839] ata3.00: exception Emask 0x1 SAct 0x1e SErr 0x0 action 0x6 frozen Apr 25 00:28:25 vare6gin kernel: [ 885.773845] ata3.00: Ata error. fis:0x21 Apr 25 00:28:25 vare6gin kernel: [ 885.773861] ata3.00: cmd 60/08:08:3f:00:ad/00:00:10:00:00/40 tag 1 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773864] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773871] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773877] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773890] ata3.00: cmd 60/18:10:9f:6b:ed/00:00:0e:00:00/40 tag 2 ncq 12288 in Apr 25 00:28:25 vare6gin kernel: [ 885.773893] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773900] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773904] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773918] ata3.00: cmd 60/08:18:3f:5f:ed/00:00:0e:00:00/40 tag 3 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773921] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773927] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773932] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773946] ata3.00: cmd 60/08:20:67:c8:91/00:00:05:00:00/40 tag 4 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773948] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773955] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773960] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773970] ata3: hard resetting link Apr 25 00:28:25 vare6gin kernel: [ 885.773974] ata3: nv: skipping hardreset on occupied port Apr 25 00:28:25 vare6gin kernel: [ 886.240073] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 25 00:28:25 vare6gin kernel: [ 886.256277] ata3.00: configured for UDMA/133 Apr 25 00:28:25 vare6gin kernel: [ 886.256305] ata3: EH complete Apr 25 00:28:27 vare6gin kernel: [ 888.176088] ata3: EH in SWNCQ mode,QC:qc_active 0xF sactive 0xF Apr 25 00:28:27 vare6gin kernel: [ 888.176099] ata3: SWNCQ:qc_active 0xF defer_bits 0x0 last_issue_tag 0x3 Apr 25 00:28:27 vare6gin kernel: [ 888.176102] dhfis 0xF dmafis 0x1 sdbfis 0x0 Apr 25 00:28:27 vare6gin kernel: [ 888.176109] ata3: ATA_REG 0x51 ERR_REG 0x40 Apr 25 00:28:27 vare6gin kernel: [ 888.176113] ata3: tag : dhfis dmafis sdbfis sacitve Apr 25 00:28:27 vare6gin kernel: [ 888.176120] ata3: tag 0x0: 1 1 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176126] ata3: tag 0x1: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176131] ata3: tag 0x2: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176136] ata3: tag 0x3: 1 0 0 1

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  • how to connect android emulator to the internet

    - by Hoff
    hi folks, basic question but i haven't been able to figure it out: how to I connect my android emulator to the internet, e.g. to use the browser? I've found lots of advice on what do to when your connected through a proxy, but that's not the case here, my machine (win7) is directly connected to the router... thanks for your help, martin

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  • How to stream semi-live audio over internet

    - by Thomas Tempelmann
    I want to write something like Skype, i.e. I have a constant audio stream on one computer and then recompress it in a format that's suitable for a latent internet connection, receive it on the other end and play it. Let's also assume that the internet connection is fairly modern and fast, i.e. DSL or alike, no slow connections over phone and such. The involved computers will also be rather modern (Dual Core Intel CPUs at 2GHz or more). I know how to handle the audio on the machines. What I don't know is how to transmit the audio in an efficient way. The challenges are: I'd like get good audio quality across the line. The stream should be received without drops. The stream may, however, be received with a little delay (a second delay is acceptable). I imagine that the transport software could first determine the average (and max) latency, then start the stream and tell the receiver to wait for that max latency before starting to play the audio. With that, if the latency doesn't get any higher, the entire stream will be playable on the other side without stutter or drops. If, due to unexpected IP latencies or blockages, the stream does get cut off, I want to be able to notice this so that I can take actions (e.g. abort the stream) and eventually start a new transmission. What are my options if I want do use ready-made software for the compression and tranmission? I have no intention to write my own audio compression engine, really. OTOH, I plan to sell the solution in a vertical market, meaning I can afford a few dollars of license fees per copy, but not $100s. I guess the simplest solution would be to just open a TCP stream, send a few packets back and forth to determine their running time (or even use UDP for that), then use the results as the guide for my max latency value, then simply fire the audio data in its raw form (uncompressed 16 bit stereo), along with a timing code over the TCP connection. The receiver reads the data and plays it with the pre-determined delay. That might just work with the type of fast connection I expect. I just wonder if there are better solutions to reach this goal, with better performance (lower latency) and less data (compressed). BTW, I first try to implement this on OS X, but might want to do it on Windows, too, if it proves successful.

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  • Internet basic concepts

    - by MB
    Hi, for school im writing an introduction to internet concepts, what should be the first thing to explain? Maybe client-server relation, TCP/IP protocol or something else?

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