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  • How to throttle your own internet connection?

    - by darkAsPitch
    I am writing a website and want to test it's speed on slower internet connections. I have the unfortunate first world problem of downloading at 100mbps, how can I throttle my own computer's internet connection to 56kbps or 5mbps to give myself an idea of how my users might be downloading my website? EDIT: I am using Windows primarily but also have an ubuntu laptop if the answer is linux oriented.

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  • Practically expected transfer rates for sdhc class 6

    - by bobobobo
    I went and bought an expensive SanDisk Extreme III SDHC 8GB class 6 chip. However when I dump data from the card to the machine via USB 2.0 cable, its only getting 5.0 MB/second maximum according to Windows 7 disk explorer. It still can take up to 20 minutes to dump the card when its near full. This is so far below the rated 20MB/s transfer speed I can't believe it. Is this normal or might I have a defective chip?

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  • How to improve IntelliJ code editor speed?

    - by Hoàng Long
    I am using IntelliJ (Community Edition) for several months, and at first I'm pleased about its speed & simplicity. But now, after upgrading to version 10, it's extremely slow. Sometimes I click a file then it takes 5 - 15 seconds to open that file (it freeze for that time). I don't know if I have done anything which cause that: I have installed 2 plugins(regex, sql), and have 2 versions of IntelliJ on my machine (now the version 9 removed, only version 10 remains). Is there any tips to improve speed of code editor, in general, or specifically IntelliJ? I have some experience when using IntelliJ: 1. Should open IntelliJ a while before working, cause it needs time for indexing. Don't open too many code tabs Open as less other program as possible. I'm using 2 GB RAM WinXP, and it just seems fairly enough for Java, IntelliJ & Chrome at the same time.

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  • Measuring device drivers CPU/IO utilization caused by my program

    - by Lior Kogan
    Sometimes code can utilize device drivers up to the point where the system is unresponsive. Lately I've optimized a WIN32/VC++ code which made the system almost unresponsive. The CPU usage, however, was very low. The reason was 1000's of creations and destruction of GDI objects (pens, brushes, etc.). Once I refactored the code to create all objects only once - the system became responsive again. This leads me to the question: Is there a way to measure CPU/IO usage of device drivers (GPU/disk/etc) for a given program / function / line of code?

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  • SQL Server Multiple Joins Are Taxing The CPU

    - by durilai
    I have a stored procedure on SQL Server 2005. It is pulling from a Table function, and has two joins. When the query is run using a load test it kills the CPU 100% across all 16 cores! I have determined that removing one of the joins makes the query run fine, but both taxes the CPU. Select SKey From dbo.tfnGetLatest(@ID) a left join [STAGING].dbo.RefSrvc b on a.LID = b.ESIID left join [STAGING].dbo.RefSrvc c on a.EID = c.ESIID Any help is appreciated, note the join is happening on the same table in a different database on the same server.

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  • Increasing speed of webservice - howto

    - by Koran
    Hi, Our client-server product has the protocol between them as XML over HTTP. Here, the client asks a GET/POST query to the web server and the server responds with XML. The server is written using django. The server has to be on the web because there are many clients across the world using this. The server code uses extensive memoization and also there is very less db queries - most queries dont have any db queries, some of them has max 1. The biggest problem is the speed. Every query takes close to 5 seconds for the reply. The data replied is also very less - in the range of 4-6 Kb. What are the mechanisms to improve speed of the web service? Is this the usual way of writing a client-server? Are there other technologies and are we missing out on it? Thank you K

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  • Mouse and touchpad move at different speeds

    - by Juan Manuel
    I have a compaq 610 running windows 7, and I use a USB mouse on it. The pointer speed is different for the mouse and the touchpad, so when I go to a meeting and take the notebook but not the mouse, the pointer moves too slow using the touchpad and I have to manually adjust it (of course when I return, I have to slow it down because the mouse would move the pointer too fast). Is there any way to fix this, or to have this setting separate for both devices?

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  • what is slowing my application?

    - by sam
    Hi, I am generating a report as a web page 3MB, I am a newbie, I am not sure why it is slow: the size is big the upload internet is slow the server is slow the browser is taking long time to process the cleint code (Jquery, javascript) please ask me questions, so I can explain more,??? I have a quad CPU, 4G Ram with two web application running, the (Down/up) is 8Mb/3Mb as ISP says, speedtest.net shows only: Ping 41ms, Download 4Mb, up: 0.16Mb thanks

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  • Should I get integrated graphics if I already have a dedicated GPU?

    - by Ivo Flipse
    I want to upgrade my computer to the new Sandy Bridge CPU's, which features integrated graphics. However, you have to choose between two types of chipsets: H67 or P67. Now since I already own a GTX 460, so is there any added value to using the integrated graphics? Would there be a way of 'disabling' my GPU when I don't need it's additional power or would the integrated graphics simply allow me to add another screen?

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  • While Loop Taking Alot of CPU Usage

    - by CuriousUser
    I am creating a keystroke logger for my personal interest, as well wanting to know how to capture and use them as functions (like key shortcuts). I got the code to learn how keylogger and GetAsyncKeyState() work: http://www.rohitab.com/discuss/index.php?showtopic=9931 I got it to run under Code::Blocks, but the weirdest things is that when I check my task manager, my CPU Usage rises to 100%. When I close the program, it goes back down, and goes back up to 100 when I turn it back on. I presume it's because of the infinite while loop, constantly checking for inputs, but I wanna know if there's anyway to decrease the CPU usage, without losing function. P.S How would I make a key shortcut? Like press (Ctrl + E) to make the program exit?

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  • C/C++ usage of special CPU features

    - by b-gen-jack-o-neill
    Hi, I am curious, do new compilers use some extra features built into new CPUs such as MMX SSE,3DNow! and so? I mean, in original 8086 there was even no FPU, so compiler that old cannot even use it, but new compilers can, since FPU is part of every new CPU. So, does new compilers use new features of CPU? Or, it should be more right to ask, does new C/C++ standart library functions use new features? Thanks for answer.

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  • Why does C++ linking use virtually no CPU?

    - by John
    On a native C++ project, linking right now can take a minute or two, yet during this time CPU drops from 100% during compilation to virtually zero. Does this mean linking is primarily a disk activity? If so, is this the main area an SSD would make big changes? But, why aren't all my OBJ files (or as many as possible) kept in RAM after compilation to avoid this? With 4Gb of RAM I should be able to save a lot of disk access and make it CPU-bound again, no?

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  • C/C++ usage of special CPU fetures

    - by b-gen-jack-o-neill
    Hi, I am curious, do new compilers use some extra features built into new CPUs such as MMX SSE,3DNow! and so? I mean, in original 8086 there was even no FPU, so compiler that old cannot even use it, but new compilers can, since FPU is part of every new CPU. So, does new compilers use new features of CPU? Or, it should be more right to ask, does new C/C++ standart library functions use new features? Thanks for answer.

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  • Periodic Slowdowns During Games

    - by Daniel
    Hi, I am having trouble with my laptop. A problem that happens is a slowdown that occurs every 5 minutes or so (problem can be seen during games). The fan will start to speed up and the laptop will slow down to about 50% of its original fps. This will persist for about 30 seconds and then continue back. Here are my specs: Intel T3400 (2.16GHz, 2 cores, 1M cache) 3 GB RAM (PC2-5300 333MHz) Mobile Intel 4 Series Express (1.26 GB VRAM)

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  • why is nautilus slow?

    - by Coding District
    I'm wondering why Nautilus is very slow when opening a directory containing lots of files. My /usr/lib dir for example has 1900 files and it takes approximately 5+ seconds to show everything. It has been like this since I installed Ubuntu few months ago and it's really quite annoying sometimes. I don't have powerful hardware but I know that Windows Explorer is so much faster than this. Is there anything that can be done to speed it up? Ubuntu 10.04

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  • Find the period of over speed ?

    - by Vimvq1987
    Just something interesting come in my mind. Assume that we have a table (in SQL Server) like this: Location Velocity Time What is the best way to determine over speed periods (speed barrier is defined) ? My first idea was loading the table into an array, and then iterate over array to find these periods: (Pseudo C# code) bool isOverSpeed = false; for (int i =0;i<arr.Length;i++) { if (!isOverSpeed) if (arr[i].Velocity > speedBarrier) { #insert the first record into another array. isOverSpeed = true; } if(isOverSpeed) if (arr[i].Velocity < speedBarrier) { #insert the record into that array isOverSpeed = false; } } It works, but somewhat "not very effectively". Is there a "smarter" way, such as a T-SQL query or another algorithm to do this?

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  • VB.Net 2008 IDE hanging - MSVB7.dll eating 100% CPU when editing code

    - by Andrew Backer
    I am having a problem with msvb7.dll eating 50%+ cpu on my dual core system. This usually lasts 10-30 seconds or so, during which time the IDE is non-responsive. This occurs when I do pretty much anything in the text editor, and can be replicated by simply adding blank lines to a function, and then deleting them. Or pasting some code. Or... lotsa stuff. SP1 installed I had DevExpress' refactor/coderush, components, and codeit.right installed, but have removed all 3 of them. (I had installed the latest version of Refactor Pro! (9.3.4), perhaps the day before) I have tried a VS.NET Repair. There is a kb that referenced some cpu destroying with vb, but it was included in SP1 Also: The solution consists of ~30 VB projects and 2 C# projects 8 other developers aren't having any issues with this (or at least not the SAME issues, we all have em) Clean get from TFS was done Project builds properly, can can even debug. This doesn't seem to happen on really small solutions, but perhaps it does and it just goes away super quick. Any clues at all as to what might be causing this, or how to fix it? I REALLY don't want to lose another day uninstalling and reinstalling and patching and so on =) If that even fixes it. Here is the stack trace (process explorer) that I get from the threads window when the msvb7.dll is churning. --- title in process explorer [threads] tab for process -------- cpu:49.28% cswitch delta: 300 to 3500 startaddress: [msvb7.dll+0x4218c] msvb7.dll version: 9.0.30729.1 --- actual stack trace ------- ntkrnlpa.exe!KiUnexpectedInterrupt+0x121 ntkrnlpa.exe!ZwYieldExecution+0x1c56 ntkrnlpa.exe!KiDispatchInterrupt+0x72e NDIS.sys!NdisFreeToBlockPool+0x15e1 // shortened stack trace. all of these are from msvb7, msvb7.dll+0x46ce7 <- 0x2676a <- 0x2698e <- 0x38031 <- 0x2659f <- 0x26644 msvb7.dll+0x25f29 <- 0x2ac7a <- 0x27522 <- 0x274a0 <- 0x2b5ce <- 0x2b6e4 msvb7.dll+0x67d0a <- 0x68551 <- 0x6817b <- 0x681f0 <- 0x67c38 <- 0x65fa8 msvb7.dll+0x666c6 <- 0x6672c <- 0x6673d <- 0x6677c <- 0x667b4 <- 0x63c77 msvb7.dll+0x63e97 <- 0x42c3a <- 0x42bc1 <- 0x41bd7 kernel32.dll!GetModuleFileNameA+0x1b4 This is the list of stuff from "copy info" in help-about, shortened to a resonable length. Microsoft Visual Studio 2008 | Version 9.0.30729.1 SP Microsoft Visual Studio 2008 Professional Edition - ENU Service Pack 1 (KB945140) KB945140 Microsoft .NET Framework | Version 3.5 SP1 Microsoft Visual Basic 2008 Microsoft Visual C# 2008 Microsoft Visual F# for Visual Studio 2008 Microsoft Visual Studio 2008 Team Explorer | Version 9.0.30729.1 Microsoft Visual Studio 2008 Tools for Office Microsoft Visual Web Developer 2008 Hotfix for Microsoft Visual Studio 2008 Professional Edition - ENU KB944899, KB945282, KB946040, KB946308, KB946344, KB946581, KB947171 KB947173, KB947180, KB947540, KB947789, KB948127, KB946260, KB946458, KB948816 Microsoft Recipe Framework Package 8.0 Process Editor WIT Designer 1.4.0.0 Process Editor for Microsoft Visual Studio Team Foundation Server, Version 1.4.0.0 tangible T4 Editor 9.0 tangible T4 Text Template Editor - T4 Editor tangibleprojectsystem 1.0 Team Foundation Server Power Tools October 2008 SQL Prompt 4.0 (disabled)

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  • How can a Perfmon "% Processor Time" counter be over 100%?

    - by Bill Paetzke
    The counter, Process: % Processor Time (sqlservr), is hovering around 300% on one of my database servers. This counter reflects the percent of total time SQL Server spent running on CPU (user mode + privilege mode). The book, Sql Server 2008 Internals and Troubleshooting, says that anything greater than 80% is a problem. How is it possible for that counter to be over 100%?

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  • Can this loop take out 100% CPU?

    - by Nitesh Panchal
    Hello, I created a chat application and seems to work just fine except that it takes up 100% cpu. Can this loop take out 100% Cpu? If yes, then what do i do to overcome it? @Override public void run(){ try { _objServerSocket = new ServerSocket(17001, 500); while (true) { try { initializeConnection(); addNewChatClient(); Thread.sleep(1000); } catch (Exception ex) { } } } catch (IOException ex) { System.out.println(ex.getCause() + "\n"+ ex.getMessage() + "\n" + ex.getStackTrace()); } } Thanks in advance :)

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  • Too many apache processes, killing the CPU

    - by RULE101
    I am noticed that too many apache processes killing the CPU in my dedicated server. 14193 (Trace) (Kill) nobody 0 66.1 0.0 /usr/local/apache/bin/httpd -k start -DSSL 14128 (Trace) (Kill) nobody 0 65.9 0.0 /usr/local/apache/bin/httpd -k start -DSSL 14136 (Trace) (Kill) nobody 0 65.9 0.0 /usr/local/apache/bin/httpd -k start -DSSL 14129 (Trace) (Kill) nobody 0 65.8 0.0 /usr/local/apache/bin/httpd -k start -DSSL 13419 (Trace) (Kill) nobody 0 65.7 0.0 /usr/local/apache/bin/httpd -k start -DSSL 13421 (Trace) (Kill) nobody 0 65.7 0.0 /usr/local/apache/bin/httpd -k start -DSSL 13426 (Trace) (Kill) nobody 0 65.7 0.0 /usr/local/apache/bin/httpd -k start -DSSL 13428 (Trace) (Kill) nobody 0 65.7 0.0 /usr/local/apache/bin/httpd -k start -DSSL 13429 (Trace) (Kill) nobody 0 65.7 0.0 /usr/local/apache/bin/httpd -k start -DSSL 12173 (Trace) (Kill) nobody 0 65.5 0.0 /usr/local/apache/bin/httpd -k start -DSSL 14073 (Trace) (Kill) nobody 0 65.5 0.0 /usr/local/apache/bin/httpd -k start -DSSL I am getting high load email notification from cpanel during the day. FROM httpd.conf Include "/usr/local/apache/conf/includes/pre_main_global.conf" Include "/usr/local/apache/conf/includes/pre_main_2.conf" LoadModule bwlimited_module modules/mod_bwlimited.so LoadModule h264_streaming_module /usr/local/apache/modules/mod_h264_streaming.so AddHandler h264-streaming.extensions .mp4 Include "/usr/local/apache/conf/php.conf" Include "/usr/local/apache/conf/includes/errordocument.conf" ErrorLog "logs/error_log" ScriptAliasMatch ^/?controlpanel/?$ /usr/local/cpanel/cgi-sys/redirect.cgi ScriptAliasMatch ^/?cpanel/?$ /usr/local/cpanel/cgi-sys/redirect.cgi ScriptAliasMatch ^/?kpanel/?$ /usr/local/cpanel/cgi-sys/redirect.cgi ScriptAliasMatch ^/?securecontrolpanel/?$ /usr/local/cpanel/cgi-sys/sredirect.cgi ScriptAliasMatch ^/?securecpanel/?$ /usr/local/cpanel/cgi-sys/sredirect.cgi ScriptAliasMatch ^/?securewhm/?$ /usr/local/cpanel/cgi-sys/swhmredirect.cgi ScriptAliasMatch ^/?webmail/?$ /usr/local/cpanel/cgi-sys/wredirect.cgi ScriptAliasMatch ^/?whm/?$ /usr/local/cpanel/cgi-sys/whmredirect.cgi RewriteEngine on AddType text/html .shtml Alias /akopia /usr/local/cpanel/3rdparty/interchange/share/akopia/ Alias /bandwidth /usr/local/bandmin/htdocs/ Alias /img-sys /usr/local/cpanel/img-sys/ Alias /interchange /usr/local/cpanel/3rdparty/interchange/share/interchange/ Alias /interchange-5 /usr/local/cpanel/3rdparty/interchange/share/interchange-5/ Alias /java-sys /usr/local/cpanel/java-sys/ Alias /mailman/archives /usr/local/cpanel/3rdparty/mailman/archives/public/ Alias /pipermail /usr/local/cpanel/3rdparty/mailman/archives/public/ Alias /sys_cpanel /usr/local/cpanel/sys_cpanel/ ScriptAlias /cgi-sys /usr/local/cpanel/cgi-sys/ ScriptAlias /mailman /usr/local/cpanel/3rdparty/mailman/cgi-bin/ <Directory "/"> AllowOverride All Options All </Directory> <Directory "/usr/local/apache/htdocs"> Options All AllowOverride None Require all granted </Directory> <Files ~ "^error_log$"> Order allow,deny Deny from all Satisfy All </Files> <Files ".ht*"> Require all denied </Files> <IfModule log_config_module> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common CustomLog "logs/access_log" common <IfModule logio_module> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio </IfModule> </IfModule> <IfModule alias_module> ScriptAlias /cgi-bin/ "/usr/local/apache/cgi-bin/" </IfModule> <Directory "/usr/local/apache/cgi-bin"> AllowOverride None Options All Require all granted </Directory> <IfModule mime_module> TypesConfig conf/mime.types AddType application/x-compress .Z AddType application/x-gzip .gz .tgz </IfModule> <IfModule prefork.c> Mutex default mpm-accept </IfModule> <IfModule mod_log_config.c> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent CustomLog logs/access_log common </IfModule> <IfModule worker.c> Mutex default mpm-accept </IfModule> # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # Direct modifications to the Apache configuration file may be lost upon subsequent regeneration of the # # configuration file. To have modifications retained, all modifications must be checked into the # # configuration system by running: # # /usr/local/cpanel/bin/apache_conf_distiller --update # # To see if your changes will be conserved, regenerate the Apache configuration file by running: # # /usr/local/cpanel/bin/build_apache_conf # # and check the configuration file for your alterations. If your changes have been ignored, then they will # # need to be added directly to their respective template files. # # # # It is also possible to add custom directives to the various "Include" files loaded by this httpd.conf # # For detailed instructions on using Include files and the apache_conf_distiller with the new configuration # # system refer to the documentation at: http://www.cpanel.net/support/docs/ea/ea3/customdirectives.html # # # # This configuration file was built from the following templates: # # /var/cpanel/templates/apache2/main.default # # /var/cpanel/templates/apache2/main.local # # /var/cpanel/templates/apache2/vhost.default # # /var/cpanel/templates/apache2/vhost.local # # /var/cpanel/templates/apache2/ssl_vhost.default # # /var/cpanel/templates/apache2/ssl_vhost.local # # # # Templates with the '.local' extension will be preferred over templates with the '.default' extension. # # The only template updated by the apache_conf_distiller is main.default. # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # PidFile logs/httpd.pid # Defined in /var/cpanel/cpanel.config: apache_port Listen 0.0.0.0:80 User nobody Group nobody ExtendedStatus On ServerAdmin [email protected] ServerName server.powerlabel.net LogLevel warn # These can be set in WHM under 'Apache Global Configuration' Timeout 300 ServerSignature On <IfModule prefork.c> </IfModule> RewriteEngine on RewriteMap LeechProtect prg:/usr/local/cpanel/bin/leechprotect Mutex file:/usr/local/apache/logs rewrite-map <IfModule !mod_ruid2.c> UserDir public_html </IfModule> <IfModule mod_ruid2.c> UserDir disabled </IfModule> # DirectoryIndex is set via the WHM -> Service Configuration -> Apache Setup -> DirectoryIndex Priority DirectoryIndex index.html.var index.htm index.html index.shtml index.xhtml index.wml index.perl index.pl index.plx index.ppl index.cgi index.jsp index.js index.jp index.php4 index.php3 index.php index.phtml default.htm default.html home.htm index.php5 Default.html Default.htm home.html # SSLCipherSuite can be set in WHM under 'Apache Global Configuration' SSLPassPhraseDialog builtin SSLUseStapling on SSLStaplingCache shmcb:/usr/local/apache/logs/stapling_cache_shmcb(256000) SSLSessionCache shmcb:/usr/local/apache/logs/ssl_gcache_data_shmcb(1024000) SSLSessionCacheTimeout 300 Mutex file:/usr/local/apache/logs ssl-cache SSLRandomSeed startup builtin SSLRandomSeed connect builtin # Defined in /var/cpanel/cpanel.config: apache_ssl_port Listen 0.0.0.0:443 AddType application/x-x509-ca-cert .crt AddType application/x-pkcs7-crl .crl AddHandler cgi-script .cgi .pl .plx .ppl .perl AddHandler server-parsed .shtml AddType text/html .shtml AddType application/x-tar .tgz AddType text/vnd.wap.wml .wml AddType image/vnd.wap.wbmp .wbmp AddType text/vnd.wap.wmlscript .wmls AddType application/vnd.wap.wmlc .wmlc AddType application/vnd.wap.wmlscriptc .wmlsc <Location /whm-server-status> SetHandler server-status Order deny,allow Deny from all Allow from 127.0.0.1 </Location> # SUEXEC is supported Include "/usr/local/apache/conf/includes/pre_virtualhost_global.conf" Include "/usr/local/apache/conf/includes/pre_virtualhost_2.conf" What can cause this and how can i fix it ?

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  • Best Practices - Core allocation

    - by jsavit
    This post is one of a series of "best practices" notes for Oracle VM Server for SPARC (also called Logical Domains) Introduction SPARC T-series servers currently have up to 4 CPU sockets, each of which has up to 8 or (on SPARC T3) 16 CPU cores, while each CPU core has 8 threads, for a maximum of 512 dispatchable CPUs. The defining feature of Oracle VM Server for SPARC is that each domain is assigned CPU threads or cores for its exclusive use. This avoids the overhead of software-based time-slicing and emulation (or binary rewriting) of system state-changing privileged instructions used in traditional hypervisors. To create a domain, administrators specify either the number of CPU threads or cores that the domain will own, as well as its memory and I/O resources. When CPU resources are assigned at the individual thread level, the logical domains constraint manager attempts to assign threads from the same cores to a domain, and avoid "split core" situations where the same CPU core is used by multiple domains. Sometimes this is unavoidable, especially when domains are allocated and deallocated CPUs in small increments. Why split cores can matter Split core allocations can silenty reduce performance because multiple domains with different address spaces and memory contents are sharing the core's Level 1 cache (L1$). This is called false cache sharing since even identical memory addresses from different domains must point to different locations in RAM. The effect of this is increased contention for the cache, and higher memory latency for each domain using that core. The degree of performance impact can be widely variable. For applications with very small memory working sets, and with I/O bound or low-CPU utilization workloads, it may not matter at all: all machines wait for work at the same speed. If the domains have substantial workloads, or are critical to performance then this can have an important impact: This blog entry was inspired by a customer issue in which one CPU core was split among 3 domains, one of which was the control and service domain. The reported problem was increased I/O latency in guest domains, but the root cause might be higher latency servicing the I/O requests due to the control domain being slowed down. What to do about it Split core situations are easily avoided. In most cases the logical domain constraint manager will avoid it without any administrative action, but it can be entirely prevented by doing one of the several actions: Assign virtual CPUs in multiples of 8 - the number of threads per core. For example: ldm set-vcpu 8 mydomain or ldm add-vcpu 24 mydomain. Each domain will then be allocated on a core boundary. Use the whole core constraint when assigning CPU resources. This allocates CPUs in increments of entire cores instead of virtual CPU threads. The equivalent of the above commands would be ldm set-core 1 mydomain or ldm add-core 3 mydomain. Older syntax does the same thing by adding the -c flag to the add-vcpu, rm-vcpu and set-vcpu commands, but the new syntax is recommended. When whole core allocation is used an attempt to add cores to a domain fails if there aren't enough completely empty cores to satisfy the request. See https://blogs.oracle.com/sharakan/entry/oracle_vm_server_for_sparc4 for an excellent article on this topic by Eric Sharakan. Don't obsess: - if the workloads have minimal CPU requirements and don't need anywhere near a full CPU core, then don't worry about it. If you have low utilization workloads being consolidated from older machines onto a current T-series, then there's no need to worry about this or to assign an entire core to domains that will never use that much capacity. In any case, make sure the most important domains have their own CPU cores, in particular the control domain and any I/O or service domain, and of course any important guests. Summary Split core CPU allocation to domains can potentially have an impact on performance, but the logical domains manager tends to prevent this situation, and it can be completely and simply avoided by allocating virtual CPUs on core boundaries.

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