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  • Viability of Mac OS X 10.9 Time Machine Server in office environment

    - by user197609
    Currently we have about 20 Mac OS 10.9 MacBook Pros (almost all with SSDs) backing up to individual USB drives. I'd like to consolidate these to one drobo thunderbolt drive array attached to a Mac Mini server (running 10.9 server) using time machine server. My question is, will this scale to 20 users? Examples I have seen seem to be 5 or 6 users tops, and this isn't easy for me to test (I'd rather not ask everyone to backup to the array and then switch back to USB drives if it brings our network to its knees). My primary concern is saturating our gigabit network, as time machine backs up every hour for every machine, so there would usually be a couple people backing up at any given time. We also have some people occasionally on our 802.11ac network and not on ethernet (usually connected via 802.11n until people upgrade to newer machines), but most of the time people are connected to our thunderbolt displays which have a gigabit ethernet connection on them. Our network topology is one 32 port gigabit switch with 5 smaller gigabit switches at each desk cluster. The mac mini server is connected directly to the top level switch. Update: Failing information from someone who has done this in practice, I suppose my question is really around how switches work. If three or four people are backing up simultaneously, and then other two (different) users transfer a file between each other, will they be able to transfer the file at gigabit speeds?

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  • Methods and practices for managing a network that has no internet connection

    - by FaultyJuggler
    Originally asked in Super User but realized this belongs here. Long story short, I am setting up a network with 32 servers of varying specs that will be used for testing and development. We will be using RedHat Linux, we also do not have a router as of yet and were looking into making one of the servers act as our router/DHCP etc. The small cluster will be on an isolated network with no internet. I can use external harddrives and discs to transfer anything from external sources into machines on the network, so this isn't a locked down secure network, it just won't have a direct connection to the outside world. I've worked on such setups before, but always long after they were setup. So I'm reaching out to see what everyone knows as far as how groups have handled initial setup and maintenance of such a situation. What is the best way to get them all configured and up to date? What are the best ways to automate updates, network wide installs, etc. With the only given that I have large multi-terabyte external hard drives that would be used to drop whatever files are needed onto a central server, how do i then distribute those files and install their contents? I've done perl scripting, some teammates have played with puppet, so we aren't completely in the dark, I just wanted to avoid reinventing the wheel since this is a common challenge.

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  • Global Email Forwarding with EXIM?

    - by Dexirian
    Been trying to find a solution to this for a while without success so here i go : I was given the task to build a High-Availability Load-Balanced Network Cluster for our 2 linux servers. I did some workaround and managed to get a DNS + SQL + Web Folders + Mails synchronisation going between both. Now i would like my server 2 to only do mailing and server 1 to only do web hosting. I transfered all the accounts for 1 to 2 using the WHM built-in account transfert feature. I created 2 different rsync jobs that sync, update, and delete the files for mail and websites. Now i was able to successfully transfer 1 mail accounts from 1 to 2, and the server 2 works flawlessly. All i had to do was change the MX entries to point to the new server and bingo. Now my problem is, some clients have their mail softwares configured so that they point to oldserver.domain.com. I cant make the (A) entry of oldserver.domain.com point to the new server for obvious reasons. I thought of using .foward files and add them to the home directories of the concerned users but that would be very difficult. So my question is : Is there a way to configure exim so that it will only foward mails to the new server? I need to change all the users so they use their mail on server 2 without them doing anything. Thanks! EDIT : TO CLARIFY MY PROBLEM Some clients have their mail point to oldserver.xyz instead of mail.olderserver.xyz I want to know if i can do something to prevent modifying the clients configuration I would also like to know is there is a way to find out what clients aren't properly configured

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  • Tungsten for MySQL: Online Schema Upgrade

    - by Jason
    In a recent presentation the Continuent folks claim that they support "daylight maintenance" or online schema upgrades. See Clustering for the Masses: A Gentle Introduction to Tungsten for MySQL, especially pages 22-28. Is anyone using Tungsten for MySQL in this way? It sounds too good to be true. I also wonder if the Community Edition supports all of the features discussed in the presentation. They say elsewhere that it is not crippleware but in their own productization table "Zero downtime upgrade" appears to only be available in the more advanced versions. So I'm skeptical. Community support seems rather non-existent so a commercial license with support is probably warranted (they do not disclose pricing). I have not contacted them directly yet as I prefer community vetting but this solution, despite its value proposition and power to make an admin's life easier just doesn't seem to get the kind of attention it might warrant. If not Tungsten for MySQL, how do you handle online schema upgrades? MySQL Cluster (NDBENGINE) is not well-suited to web applications. Cheers

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  • Building a small server farm

    - by RayQuang
    Hi, I am planning to set up a Tech startup company that will provide web application solutions. Eventually we hope to diversify into different areas such as possibly social media or other services. For now we plan on running a high demand (from 1000 to 10,000 users in the first year) website running the application. This includes a MySQL database backend, email, and development servers. My question is then, what type of server arrangement will work best, that is ti say should i have a small cluster of ultra high power machines (E.G. Top of the range Xeons, with 12GB RAM) or will it be better to have more less powerful servers load balanced? Should I go for 1 - 2 u servers rack mounted ot would it be beter for it just to be tower servers for maintainability? Finally I would also like to know what kind of Internet and router i would need, I currently have 10mbit down and barely 1 mbit up, but soon our area will have a fiber optic connection with international speeds of up to 25 mbit / sec. Thanks in advance, RayQuang UPDATE: sorry I forgot to mention it, the platform that I will be using is PHP with the APC code cache, Probably running Debian.

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  • Nginx as reverse proxy: how to properly configure gateway timeout?

    - by user1281376
    We have configured Nginx as a reverse proxy to an Apache server farm, but I'm running into trouble with the gateway timeouts. Our Goal in human readable form is: "Deliver a request within one second, but if it really takes longer, deliver anyway", which for me translates into "Try the first Apache server in upstream for max 500ms. If we get a timeout / an error, try the next one and so on until we finally succeed." Now our relevant configuration is this: location @proxy { proxy_pass http://apache$request_uri; proxy_connect_timeout 1s; proxy_read_timeout 2s; } [...] upstream apache { server 127.0.0.1:8001 max_fails=1 fail_timeout=10s; server 10.1.x.x:8001 max_fails=1 fail_timeout=10s backup; server 10.1.x.x:8001 max_fails=1 fail_timeout=10s backup; server 10.1.x.x:8001 max_fails=1 fail_timeout=10s backup; } The problem here is that nginx seems to misunderstand this as "Try to get a response from the whole upstream cluster within one second and deliver a 50X error if we don't - without any limit on how long to try any upstream server", which is obviously not what we had in mind. Is there any way to get nginx to do what we want?

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  • Deploying Memcached as 32bit or 64bit?

    - by rlotun
    I'm curious about how people deploy memcached on 64 bit machines. Do you compile a 64bit (standard) memcached binary and run that, or do people compile it in 32bit mode and run N instances (where N = machine_RAM / 4GB)? Consider a recommended deployment of Redis (from the Redis FAQ): Redis uses a lot more memory when compiled for 64 bit target, especially if the dataset is composed of many small keys and values. Such a database will, for instance, consume 50 MB of RAM when compiled for the 32 bit target, and 80 MB for 64 bit! That's a big difference. You can run 32 bit Redis binaries in a 64 bit Linux and Mac OS X system without problems. For OS X just use make 32bit. For Linux instead, make sure you have libc6-dev-i386 installed, then use make 32bit if you are using the latest Git version. Instead for Redis <= 1.2.2 you have to edit the Makefile and replace "-arch i386" with "-m32". If your application is already able to perform application-level sharding, it is very advisable to run N instances of Redis 32bit against a big 64 bit Redis box (with more than 4GB of RAM) instead than a single 64 bit instance, as this is much more memory efficient. Would not the same recommendation also apply to a memcached cluster?

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  • ????????????????

    - by Yusuke.Yamamoto
    ????????? ????????? ????????? ????·???? ?????:Oracle???????·??????(????)??:?????????????? Pickup!:IT???????????!|????????:100???????!|???????????? ????????:?Oracle DB?????????????????????Windows?VMware?? ?????:Oracle OpenWorld Tokyo 2012|JavaOne Tokyo 2012|??????:151 ?OTN ???? ?????? ????????:???????100???????! ?????????????????Amazon????Get! ???? Oracle Technology Network, ????/????, ??IT???????·?????????????? ???????/???MySQL?????? ?????? ???????/???MySQL????? ?????????Oracle VM VirtualBox????Oracle Real Application Clusters (RAC) 11g Release 2????? ???????/??????????????????????????????? ???????/?????????????/????·????????Flashback Database with SSD? ????? ????? Oracle?????????????????????????!???????????? Oracle Enterprise Manager 12c(EM12c):????????? ~????????~ ???????????!??????·??????? Oracle Linux 5.8?????????? ???DB?????Oracle SQL Developer 3.1???????????? Oracle??????(OUI:Oracle Universal Installer)???? ????? ???? ????????? ????????????·???????? ????????????? ???????? 11gR2 ?????????? Oracle Database 11g R2 Oracle WebLogic Server 11g R1 Oracle Enterprise Manager 11g R1 ????? ????????? Oracle Database ????????????????·?? ???????/???????????????? ?????????(????????, ???, etc) ????????(???, ?????, REDO, ???·????, etc) ????·?????????????????(?????, ???, ??, ??, ??? etc) ????·?????????(??, etc) ????????????? ???????????????????·?????? ??????? ???? ????????·??|SQL Server Windows Server ??????????PL/SQL|Java|.NET|PHP ??/??? ORACLE MASTER ???? DWH(?????????)??·?? ????? ?????(SAN, NAS, SSD, etc) Oracle Database ??????? Amazon EC2 Microsoft Excel Microsoft Visual Studio MSFC/MSCS(Microsoft Cluster Service) SAP ??·??????? Oracle Database Oracle Database 11g Release 2(11gR2) Oracle Database Standard Edition ????????: Advanced Compression ?????????: Advanced Security Application Express(APEX) Automatic Storage Management(ASM) SSD???Oracle???: Database Smart Flash Cache ??????????: Data Guard/Active Data Guard Data Pump Oracle Data Provider for .NET(ODP.NET) ????: Oracle Text Partitioning(???????/?????????) DB????: Real Application Clusters(RAC) Real Application Testing Recovery Manager(RMAN) SQL*Loader|SQL*Plus|Statspack ??????|????????|???????? Database Appliance Database Firewall Exadata Database Machine SQL Developer ?????DB: TimesTen In-Memory Database Oracle Fusion Middleware Java Oracle Coherence Oracle Data Integrator(ODI) Oracle GoldenGate Oracle JRockit JVM Oracle WebLogic Server Oracle Enterprise Manager for Database|for Middleware ????????????: Oracle Application Testing Suite Oracle Linux Oracle Solaris DTrace|ZFS|???/???? Oracle VM Server for x86 ?????? ???????? ?????????Oracle???????????????·????????????????? ?????????(??·??????) OTN??????(??????) ???????(????????) Oracle University(??) ??????! ?????... ????? ?????? ????? ?????? ?????|?Sun?? ???????? OTN???????? OTN(????) ?????? ???? OTN???|???? OTN?????? ??????? ?????? ???????? ???? ???????

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  • Parsing with BeautifulSoup, error message TypeError: coercing to Unicode: need string or buffer, NoneType found

    - by Samsun Knight
    so I'm trying to scrape an Amazon page for data, and I'm getting an error when I try to parse for where the seller is located. Here's my code: #getting the html request = urllib2.Request('http://www.amazon.com/gp/offer-listing/0393934241/') opener = urllib2.build_opener() #hiding that I'm a webscraper request.add_header('User-Agent', 'Mozilla/5 (Solaris 10) Gecko') #opening it up, putting into soup form html = opener.open(request).read() soup = BeautifulSoup(html, "html5lib") #parsing for the seller info sellers = soup.findAll('div', {'class' : 'a-row a-spacing-medium olpOffer'}) for eachseller in sellers: #parsing for price price = eachseller.find('span', {'class' : 'a-size-large a-color-price olpOfferPrice a-text-bold'}) #parsing for shipping costs shippingprice = eachseller.find('span' , {'class' : 'olpShippingPrice'}) #parsing for condition condition = eachseller.find('span', {'class' : 'a-size-medium'}) #parsing for seller name sellername = eachseller.find('b') #parsing for seller location location = eachseller.find('div', {'class' : 'olpAvailability'}) #printing it all out print "price, " + price.string + ", shipping price, " + shippingprice.string + ", condition," + condition.string + ", seller name, " + sellername.string + ", location, " + location.string I get the error message, pertaining to the 'print' command at the end, "TypeError: coercing to Unicode: need string or buffer, NoneType found" I know that it's coming from this line - location = eachseller.find('div', {'class' : 'olpAvailability'}) - because the code works fine without that line, and I know that I'm getting NoneType because the line isn't finding anything. Here's the html from the section I'm looking to parse: <*div class="olpAvailability"> In Stock. Ships from WI, United States. <*br/><*a href="/gp/aag/details/ref=olp_merch_ship_9/175-0430757-3801038?ie=UTF8&amp;asin=0393934241&amp;seller=A1W2IX7T37FAMZ&amp;sshmPath=shipping-rates#aag_shipping">Domestic shipping rates</a> and <*a href="/gp/aag/details/ref=olp_merch_return_9/175-0430757-3801038?ie=UTF8&amp;asin=0393934241&amp;seller=A1W2IX7T37FAMZ&amp;sshmPath=returns#aag_returns">return policy</a>. <*/div> (but without the stars - just making sure the HTML doesn't compile out of code form) I don't see what's the problem with the 'location' line of code, or why it's not pulling the data I want. Help?

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  • Using Zend_HTTP_Client instead of CURL

    - by Vincent
    All, I want to use Zend_HTTP_CLient instead of CURL as there are issues with using curl on Solaris. I have the following curl code.. How will this code be written if I want to use Zend_HTTP_Client? $ch = curl_init(); $devnull = fopen('/tmp/cookie.txt', 'w'); curl_setopt($ch, CURLOPT_STDERR, $devnull); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_URL, $desturl); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,800); curl_setopt($ch, CURLOPT_AUTOREFERER, true); curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate'); curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata); $retVal = curl_exec($ch); print_r(curl_error($ch)); curl_close($ch); if ($devnull) { fclose($devnull); } Thanks

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  • Evaluation of environment variables in command run by Java's Runtime.exec()

    - by Tom Duckering
    Hi, I have a scenarios where I have a Java "agent" that runs on a couple of platforms (specifically Windows, Solaris & AIX). I'd like to factor out the differences in filesystem structure by using environment variables in the command line I execute. As far as I can tell there is no way to get the Runtime.exec() method to resolve/evaluate any environment variables referenced in the command String (or array of Strings). I know that if push comes to shove I can write some code to pre-process the command String(s) and resolve enviroment variables by hand (using getEnv() etc). However I'm wondering if there is a smarter way to do this since I'm sure I'm not the only person wanting to do this and I'm sure there are pitfalls in "knocking up" my own implementation. Your guidance and suggestions are most welcome. edit: I would like to refer to environment variables in the command string using some consistent notation such as $VAR and/or %VAR%. Not fussed which. edit: To be clear I'd like to be able to execute a command such as: perl $SCRIPT_ROOT/somePerlScript.pl args on Windows and Unix hosts using Runtime.exec(). I specify the command in config file that describes a list of jobs to run and it has to be able to work cross platform, hence my thought that an environment variable would be useful to factor out the filesystem differences (/home/username/scripts vs C:\foo\scripts). Hope that helps clarify it. Thanks. Tom

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  • Working around MySQL error "Deadlock found when trying to get lock; try restarting transaction"

    - by Anon Guy
    Hi all: I have a MySQL table with about 5,000,000 rows that are being constantly updated in small ways by parallel Perl processes connecting via DBI. The table has about 10 columns and several indexes. One fairly common operation gives rise to the following error sometimes: DBD::mysql::st execute failed: Deadlock found when trying to get lock; try restarting transaction at Db.pm line 276. The SQL statement that triggers the error is something like this: UPDATE file_table SET a_lock = 'process-1234' WHERE param1 = 'X' AND param2 = 'Y' AND param3 = 'Z' LIMIT 47 The error is triggered only sometimes. I'd estimate in 1% of calls or less. However, it never happened with a small table and has become more common as the database has grown. Note that I am using the a_lock field in file_table to ensure that the four near-identical processes I am running do not try and work on the same row. The limit is designed to break their work into small chunks. I haven't done much tuning on MySQL or DBD::mysql. MySQL is a standard Solaris deployment, and the database connection is set up as follows: my $dsn = "DBI:mysql:database=" . $DbConfig::database . ";host=${DbConfig::hostname};port=${DbConfig::port}"; my $dbh = DBI->connect($dsn, $DbConfig::username, $DbConfig::password, { RaiseError => 1, AutoCommit => 1 }) or die $DBI::errstr; I have seen online that several other people have reported similar errors and that this may be a genuine deadlock situation. I have two questions: What exactly about my situation is causing the error above? Is there a simple way to work around it or lessen its frequency? For example, how exactly do I go about "restarting transaction at Db.pm line 276"? Thanks in advance.

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  • Perl Lingua giving weird error on install

    - by user299306
    I am trying to install perl Lingua onto a unix system (ubuntu, latest version). Of course I am root. when I go into the package to install using 'perl Makefile.pl' I get this dumb error: [root@csisl27 Lingua-Lid-0.01]# perl Makefile.PL /opt/ls//lib does not exist at Makefile.PL line 48. I have tried playing with the path on line 48, nothing changes, here is what line 48-50 looks like: Line 48: die "$BASE/lib does not exist" unless -d "$BASE/lib"; Line 49: die "$BASE/include does not exist" unless -d "$BASE/include"; Line 50: die "lid.h is missing in $BASE/include" unless -e "$BASE/includ/lid.h"; The variable $BASE is declared as this: $BASE = "/opt/ls/" if ($^O eq "linux" or $^O eq "solaris"); $BASE = "/usr/local/" if ($^O eq "freebsd"); $BASE = $ENV{LID_BASE_DIR} if (defined $ENV{LID_BASE_DIR}); Now the perl program I am trying to write simply look like this (just my base): #!/usr/bin/perl use Lingua::LinkParser; use strict; print "Hello world!\n"; When I run this trying to use Lingua, here is my error: [root@csisl27 assign4]# ./perl_parser_1.pl Can't locate Lingua/LinkParser.pm in @INC (@INC contains: /usr/lib/perl5/site_perl/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.10.0 /usr/lib/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.10.0 /usr/lib/perl5/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/5.10.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl .) at ./perl_parser_1.pl line 3. BEGIN failed--compilation aborted at ./perl_parser_1.pl line 3. Tried insalling this from cpan, still doesn't properly work.

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  • Perl, module export symbol

    - by Mike
    I'm having trouble understanding how to export a package symbol to a namespace. I've followed the documentation almost identically, but it seems to not know about any of the exporting symbols. mod.pm #!/usr/bin/perl package mod; use strict; use warnings; require Exporter; @ISA = qw(Exporter); @EXPORT=qw($a); our $a=(1); 1; test.pl $ cat test.pl #!/usr/bin/perl use mod; print($a); This is the result of running it $ ./test.pl Global symbol "@ISA" requires explicit package name at mod.pm line 10. Global symbol "@EXPORT" requires explicit package name at mod.pm line 11. Compilation failed in require at ./test.pl line 3. BEGIN failed--compilation aborted at ./test.pl line 3. $ perl -version This is perl, v5.8.4 built for sun4-solaris-64int

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  • Memory leak of java.lang.ref.WeakReference objects inside JDK classes

    - by mandye
    The following simple code reproduces the growth of java.lang.ref.WeakReference objects in the heap: public static void main(String[] args) throws Exception { while (true) { java.util.logging.Logger.getAnonymousLogger(); Thread.sleep(1); } } Here is the output of jmap command within a few seconds interval: user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 22493 1079664 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 106: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23191 1113168 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23804 1142592 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference Note that jmap command forces FullGC. JVM settings: export JVM_OPT="\ -d64 \ -Xms200m -Xmx200m \ -XX:MaxNewSize=64m \ -XX:NewSize=64m \ -XX:+UseParNewGC \ -XX:+UseConcMarkSweepGC \ -XX:MaxTenuringThreshold=10 \ -XX:SurvivorRatio=2 \ -XX:CMSInitiatingOccupancyFraction=60 \ -XX:+UseCMSInitiatingOccupancyOnly \ -XX:+CMSParallelRemarkEnabled \ -XX:+DisableExplicitGC \ -XX:+CMSClassUnloadingEnabled \ -XX:+PrintGCTimeStamps \ -XX:+PrintGCDetails \ -XX:+PrintTenuringDistribution \ -XX:+PrintGCApplicationConcurrentTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintClassHistogram \ -XX:+ParallelRefProcEnabled \ -XX:SoftRefLRUPolicyMSPerMB=1 \ -verbose:gc \ -Xloggc:$GCLOGFILE" java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode) Solaris 10/Sun Fire(TM) T1000

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  • Threads, Sockets, and Designing Low-Latency, High Concurrency Servers

    - by lazyconfabulator
    I've been thinking a lot lately about low-latency, high concurrency servers. Specifically, http servers. http servers (fast ones, anyway) can serve thousands of users simultaneously, with very little latency. So how do they do it? As near as I can tell, they all use events. Cherokee and Lighttpd use libevent. Nginx uses it's own event library performing much the same function of libevent, that is, picking a platform optimal strategy for polling events (like kqueue on *bsd, epoll on linux, /dev/poll on Solaris, etc). They all also seem to employ a strategy of multiprocess or multithread once the connection is made - using worker threads to handle the more cpu intensive tasks while another thread continues to listen and handle connections (via events). This is the extent of my understanding and ability to grok the thousand line sources of these applications. What I really want are finer details about how this all works. In examples of using events I've seen (and written) the events are handling both input and output. To this end, do the workers employ some sort of input/output queue to the event handling thread? Or are these worker threads handling their own input and output? I imagine a fixed amount of worker threads are spawned, and connections are lined up and served on demand, but how does the event thread feed these connections to the workers? I've read about FIFO queues and circular buffers, but I've yet to see any implementations to work from. Are there any? Do any use compare-and-swap instructions to avoid locking or is locking less detrimental to event polling than I think? Or have I misread the design entirely? Ultimately, I'd like to take enough away to improve some of my own event-driven network services. Bonus points to anyone providing solid implementation details (especially for stuff like low-latency queues) in C, as that's the language my network services are written in.

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  • Setting up ehcache replication - what multicast settings do I need?

    - by Darren Greaves
    I am trying to set up ehcache replication as documented here: http://ehcache.sourceforge.net/EhcacheUserGuide.html#id.s22.2 This is on a Windows machine but will ultimately run on Solaris in production. The instructions say to set up a provider as follows: <cacheManagerPeerProviderFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory" properties="peerDiscovery=automatic, multicastGroupAddress=230.0.0.1, multicastGroupPort=4446, timeToLive=32"/> And a listener like this: <cacheManagerPeerListenerFactory class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory" properties="hostName=localhost, port=40001, socketTimeoutMillis=2000"/> My questions are: Are the multicast IP address and port arbitrary (I know the address has to live within a specific range but do they have to be specific numbers)? Do they need to be set up in some way by our system administrator (I am on an office network)? I want to test it locally so am running two separate tomcat instances with the above config. What do I need to change in each one? I know both the listeners can't listen on the same port - but what about the provider? Also, are the listener ports arbitrary too? I've tried setting it up as above but in my testing the caches don't appear to be replicated - the value added in one tomcat's cache is not present in the other cache. Is there anything I can do to debug this situation (other than packet sniffing)? Thanks in advance for any help, been tearing my hair out over this one!

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  • Best support now on windows: Mercurial or Git?

    - by mamcx
    I want to change my current subversion setup to Mercurial or Git. I read about the two and I have a conflicted view about how well they work on windows. Alot of pages say Git is sub-par on windows, slow and badly integrated. And almost everyone say Mercurial is better. But some say Git now is better and Mercurial is behind. I check the screenshots of TortoiseHG and TortoiseGIT and the mercurial one look "worse"... but maybe is just crappy screenshots? I read about the two, prefer the command-line interface of Mercurial, but seriously, I don't pretend to touch the command line. And if one of the two is a real improvenment to SVN, I don't have to do that (In SVN is necesary go to the metal because something need fix). In SVN I have issues when commit or get code made on OSX (I code on Windows, OSX, Solaris. Mainly windows). So I hope don't get that issues again (I mean, failure to commit to the repo). I have a small repository, doing solo.

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  • Asynchronous event loop design and issues.

    - by Artyom
    Hello, I'm designing event loop for asynchronous socket IO using epoll/devpoll/kqueue/poll/select (including windows-select). I have two options of performing, IO operation: Non-blocking mode, poll on EAGAIN Set socket to non-blocking mode. Read/Write to socket. If operation succeeds, post completion notification to event loop. If I get EAGAIN, add socket to "select list" and poll socket. Polling mode: poll and then execute Add socket to select list and poll it. Wait for notification that it is readable writable read/write Post completion notification to event loop of sucseeds To me it looks like first would require less system calls when using in normal mode, especially for writing to socket (buffers are quite big). Also it looks like that it would be possible to reduce the overhead over number of "select" executions, especially it is nice when you do not have something that scales well as epoll/devpoll/kqueue. Questions: Are there any advantages of the second approach? Are there any portability issues with non-blocking operations on sockets/file descriptors over numerous operating systems: Linux, FreeBSD, Solaris, MacOSX, Windows. Notes: Please do not suggest using existing event-loop/socket-api implementations

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  • Wait on multiple condition variables on Linux without unnecessary sleeps?

    - by Joseph Garvin
    I'm writing a latency sensitive app that in effect wants to wait on multiple condition variables at once. I've read before of several ways to get this functionality on Linux (apparently this is builtin on Windows), but none of them seem suitable for my app. The methods I know of are: Have one thread wait on each of the condition variables you want to wait on, which when woken will signal a single condition variable which you wait on instead. Cycling through multiple condition variables with a timed wait. Writing dummy bytes to files or pipes instead, and polling on those. #1 & #2 are unsuitable because they cause unnecessary sleeping. With #1, you have to wait for the dummy thread to wake up, then signal the real thread, then for the real thread to wake up, instead of the real thread just waking up to begin with -- the extra scheduler quantum spent on this actually matters for my app, and I'd prefer not to have to use a full fledged RTOS. #2 is even worse, you potentially spend N * timeout time asleep, or your timeout will be 0 in which case you never sleep (endlessly burning CPU and starving other threads is also bad). For #3, pipes are problematic because if the thread being 'signaled' is busy or even crashes (I'm in fact dealing with separate process rather than threads -- the mutexes and conditions would be stored in shared memory), then the writing thread will be stuck because the pipe's buffer will be full, as will any other clients. Files are problematic because you'd be growing it endlessly the longer the app ran. Is there a better way to do this? Curious for answers appropriate for Solaris as well.

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  • A monkey could do this better - Access to and availability of private member functions in C++

    - by David
    I am wandering the desert of my brain. I'm trying to write something like the following: class MyClass { // Peripherally Related Stuff public: void TakeAnAction(int oneThing, int anotherThing) { switch(oneThing){ case THING_A: TakeThisActionWith(anotherThing); break; //cases THINGS_NOT_A: }; private: void TakeThisActionWith(int thing) { string outcome = new string; outcome = LookUpOutcome(thing); // Do some stuff based on outcome return; } string LookUpOutcome(int key) { string oc = new string; oc = MyPrivateMap[key]; return oc; } map<int, string> MyPrivateMap; Then in the .cc file where I am actually using these things, while compiling the TakeAnAction section, it [CC, the solaris compiler] throws an an error: 'The function LookUpOutcome must have a prototype' and bombs out. In my header file, I have declared 'string LookUpOutcome(int key);' in the private section of the class. I have tried all sorts of variations. I tried to use 'this' for a little while, and it gave me 'Can only use this in non-static member function.' Sadly, I haven't declared anything static and these are all, putatively, member functions. I tried it [on TakeAnAction and LookUp] when I got the error, but I got something like, 'Can't access MyPrivateMap from LookUp'. MyPrivateMap could be made public and I could refer to it directly, I guess, but my sensibility says that is not the right way to go about this [that means that namespace scoped helper functions are out, I think]. I also guess I could just inline the lookup and subsequent other stuff, but my line-o-meter goes on tilt. I'm trying desperately not to kludge it.

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  • C++ operator new, object versions, and the allocation sizes

    - by mizubasho
    Hi. I have a question about different versions of an object, their sizes, and allocation. The platform is Solaris 8 (and higher). Let's say we have programs A, B, and C that all link to a shared library D. Some class is defined in the library D, let's call it 'classD', and assume the size is 100 bytes. Now, we want to add a few members to classD for the next version of program A, without affecting existing binaries B or C. The new size will be, say, 120 bytes. We want program A to use the new definition of classD (120 bytes), while programs B and C continue to use the old definition of classD (100 bytes). A, B, and C all use the operator "new" to create instances of D. The question is, when does the operator "new" know the amount of memory to allocate? Compile time or run time? One thing I am afraid of is, programs B and C expect classD to be and alloate 100 bytes whereas the new shared library D requires 120 bytes for classD, and this inconsistency may cause memory corruption in programs B and C if I link them with the new library D. In other words, the area for extra 20 bytes that the new classD require may be allocated to some other variables by program B and C. Is this assumption correct? Thanks for your help.

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  • JDialog setResizable(false) is not working in Window Title Bar Menu

    - by jolonaleur
    JDialog setResizable(false) is not working in Window Title Bar Menu Windows XP SP2 Java JRE 1.6.0_11-b03 Behavior varies. Sometimes, the Maximize and Minimize item on the window menu is disabled and sometimes enabled. Steps to reproduce enabled Maximize and Minimize button: Show the JDialog with setResizable(false) Open another window, say for example Notepad. Right-click on the window title bar of Notepad and click Maximize. Go to your JDialog and right click on the window title bar. Maximize window is enabled. Likewise, to disable the Maximize item for the JDialog, go to the maximized Notepad window and right click on title bar. Maximize item is disabled in the Notepad window. Go the your JDialog and right click on the title bar, notice that the Maximize item is also disabled. Note that my application can not use the defaultLookAndFeel method of java dialogs. The bug report related to this was for Solaris OS but that was already ages ago. bug report Is there any workaround? Thanks.

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  • How do I export a package symbol to a namespace in Perl?

    - by Mike
    I'm having trouble understanding how to export a package symbol to a namespace. I've followed the documentation almost identically, but it seems to not know about any of the exporting symbols. mod.pm #!/usr/bin/perl package mod; use strict; use warnings; require Exporter; @ISA = qw(Exporter); @EXPORT=qw($a); our $a=(1); 1; test.pl $ cat test.pl #!/usr/bin/perl use mod; print($a); This is the result of running it $ ./test.pl Global symbol "@ISA" requires explicit package name at mod.pm line 10. Global symbol "@EXPORT" requires explicit package name at mod.pm line 11. Compilation failed in require at ./test.pl line 3. BEGIN failed--compilation aborted at ./test.pl line 3. $ perl -version This is perl, v5.8.4 built for sun4-solaris-64int

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  • ESXi with software iSCSI

    - by jharley
    Has anyone had any luck using the swiSCSI driver on ESXi? Following the instructions from VMWare.com I get to the point where I have the iSCSI HBA showing up but no LUNs/targets are showing up. The iSCSI target is running on Solaris 10 update 5 and works with other initiators fine. The ESXi initiator (from the logs) sees the targets but just logs in and out of them every 2 - 5 seconds. We're using unauthenticated discovery, and over and over in /var/log/messages I see: iSCSI: bus 0 target 0 trying to establish session 0xb203f90 to portal 0, address 10.1.100.9 port 3260 group 1 iSCSI: bus 0 target 0 establish session 0xb203f90 #4848 to port 0, address 10.1.100.9 port 3260 group 1, alias data/ESXi iSCSI: session 0xb203f90 dropping after receiving unexpected opcode 0x60 iSCSI: session 0xb203f90 to data/ESXi dropped iSCSI: session 0xb203f90 to data/ESXi waiting 2 seconds before next login attempt The only other thing that seems out of wack is that my 'Recent Tasks' pane keeps filling with 'Browse Diagnostic Manager' events and /var/log/vmware/hostd.log is filled with messages like this up to two times per second: [2008-09-19 16:05:57.901 'TaskManager' 196621 info] Task Created: haTask-ha-host-vim.DiagnosticManager.browser-776 [2008-09-19 16:05:57.094 'TaskManager' 196621 info] Task Completed: haTask-ha-host-vim.DiagnosticManager.browser-766 Any help would be appreciated.

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