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• Is MPI_Request global among the MPI processees ?

  - by debugger

  Hello All, If i declare a table of MPI_Request ( one request for each CPU ), it will be accessible globally when using for MPI_Isend/MPI_Irecv ?? ( In comparison with MPI_comm that is everywhere accessible after initializing the MPI environment ) Thanks.

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• Looking for a fast hash-function.

  - by Julian

  Hello, I'm looking for a special hash-function. Let's say I have a large list of strings, if I order them by their hash-values they should be ordered quasi randomly. The most important point is: it must be super fast. I've tried md5 and sha1 and they're using to much cpu power. Clashes are not a problem. I'm using javascript, so it shouldn't be too complicated to implement.

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• showing .tif images in matlab

  - by sepideh

  I am trying to show a .tif image in matlab and I use these two line of codes a = imread('C:\Users\sepideh\Desktop\21_15.tif'); imshow(a) that encounters this warning Warning: Image is too big to fit on screen; displaying at 3% In imuitools\private\initSize at 73 In imshow at 262 what is the cause of this warning and what can I do to fix that? the main trouble is it sometimes doesn't show the image and of course even if it shows the image CPU usage gets high that I can't zoom properly

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• What the best multi-thread application debugger for C++ apps.

  - by Coredumped

  I'm looking for a good multi-thread-aware debugger, capable of showing performance charts of application threads on Linux, don't know if such a thing exists, perhaps as a Eclipse plugin. The idea would be to track per thread memory allocation a CPU usage as well as being able to interrupt a thread and examine its stack trace, local vars, etc. It does not have to be an eclipse plugin or a free tool, do any of you have heard of something similar?

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• Visual studio 2010 beta 2 problem

  - by bemon

  Hi there! I've been messing around with VS2010 beta 2 (ultimate) on windows7 and already I have a nasty problem - when I try to run devenv it's only shows me very-nice-beta2 splash screen and cpu usage of devenv process run to sky. If thats can help - on machine i have already vs2008 installed.

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• Finding resource utilization on a web site

  - by Aravindkumar

  I am doing a project to find CPU, memory and IO utilization consumed by a page to get loaded after logging into it.can any one help me?

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• Is there an Javascript event for when a the page is pushed into the background?

  - by Georg

  I remember having used such an event, but I can't remember the name. The specific task I'm trying to accomplish is to stop my slideshow when the browser window isn't in the foreground. I'm fading the different images with jQuery, which uses quite some CPU power. Is there an event that tells me, when the user switches to another application / page.

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• "blkclr (mach_kernel)" shows up in mac's shark profiler. What does it do?

  - by lh3

  I am profiling a C program using Mac's Shark which shows that some of CPU time goes to "blkclr" in "mach_kernel". What does this kernel function do? I speculate it is related to memory allocation, but I am not sure. I have googled for some time, but could not find the answer, either. Does someone know this? Thanks in advance.

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• Tools to profile the most computational cost of my .NET application.

  - by smwikipedia

  I have a C# application which sometimes cost the CPU very high. I want to see which part of the code cost most. But the Microsoft CLR Profiler only determins the memory usage, it's not meant for computational profiling according to here. Is there any tools to do this? Thanks.

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• How can I measure the speed of code written in Java? (AI algorithms)

  - by Registered User

  Hi All, How can I measure the speed of code written in Java? I planning to develop software which will solve Sudoku using all presently available AI and ML algorithms and compare time against simple brute-force method. I need to measure time of each algorithm, I would like to ask for suggestions on what is the best way of doing that? Very important, program must be useful on any machine regardless to CPU power/memory. Thank you.

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• snmp and platform specific information

  - by reza

  I need to come with a strategy to use gather information about the health of my linux platform, hardware health such as high CPU temperature and may be disk space usage, etc... I know my examples are not very good ones. Essentially, I have an SNMP agent running on Linux and I need it to provide platform specific health and state information. Are there any Linux packages that do this, what MIBs to use, Dell Open Manager functionality??? Any thoughts and comments are appreciated.

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• Can I get memory usage of processes running on the monitored server by newrelic REST API

  - by youlin

  according to the newrelic faq https://docs.newrelic.com/docs/server/server-monitor-faq, The Server Monitoring agent can report Top 20 processes that are using significant memory or I/O and I can view the memory usage of the processes on the newrelic portal page. However, I do not find any clue about how to get this metrics by newrelic REST API (I can get the CPU usage of processes by REST API). Is it possible to do this?

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• Firebird 2.1 + EXISTS = query bug?

  - by Atlas

  Using Delphi 2009 + Firebird 2.1.3. Database is ODS 11.1, default char set is UTF8. My prepared query is as follows: SELECT a.po_id, a.po_no FROM purchase_order a WHERE EXISTS (SELECT 1 FROM sales_order_item z1 JOIN purchase_order_item z2 ON z2.so_item_id = z1.so_item_id AND z2.po_id = a.po_id WHERE z1.so_id = :soid) ORDER BY a.po_no Now when I loop this say 1000 times because I have 1000 x so_id, the CPU usage get at 100% for FBSERVER.EXE Anyone encountered this problem?

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• How does XNA timing work?

  - by oakskc

  How does XNA maintain a consistent and precise 60 FPS frame rate? Additionally, how does it maintain such precise timing without pegging the CPU at 100%?

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• Regex vs. string:find() for simple word boundary

  - by user576267

  Say I only need to find out whether a line read from a file contains a word from a finite set of words. One way of doing this is to use a regex like this: .*\y(good|better|best)\y.* Another way of accomplishing this is using a pseudo code like this: if ( (readLine.find("good") != string::npos) || (readLine.find("better") != string::npos) || (readLine.find("best") != string::npos) ) { // line contains a word from a finite set of words. } Which way will have better performance? (i.e. speed and CPU utilization)

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• Why is the PrintDialog not displaying (in 64 bit)?

  - by Bill

  This code, when built in .Net for Any CPU platform and running on a 64-bit machine, simply returns a DialogResult of Cancel without showing the expected dialog box. Dim dlg As New System.Windows.Forms.PrintDialog If dlg.ShowDialog() = Windows.Forms.DialogResult.OK Then '... print the document ' End If However, it works fine when the application is built for the x86 platform, and run on a 64-bit machine. How can you display the dialog with a 64-bit compile?

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• What instance type should I choose?

  - by cute

  To run video chat service? High-Memory or High-CPU? And, guess Standard isn't suitable?

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• mySQL: How many rows in a table before performance is affected?

  - by Industrial

  Hi everybody, Is there a "known limit" for columns & rows in a mySQL table that when passed, it can be safe to say that performance is severely affected? I've think that I had heard that there is a "golden number" that you really dont want to exceed in either columns or rows in a table. - Or is it all about the size of the index and available RAM + CPU on the server? Thanks!

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• installation of mac 10.6.2

  - by mahesh

  hi i installed vmware workstation 7.0 in windows,and it working well.i installed mac os 10.4.8 in it as a guest it is alo working well,but while installin mac os 10.6.2 it dont installed and shows an error as "invalid front-side bus freqency 66000000 hz. disablin the cpu." please help me how to solve this and please suggest any link to easyly understand installation if mac os 10.6.2

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• How many FPS should I have for updating a custom progress bar?

  - by Tom Dignan

  I just wrote a custom progress bar, it's single buffered and will remain so. How many frames per second are desirable for something like this? I don't want to waste too much CPU updating the screen unnecessarily.

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• How to restrict http access to video files?

  - by Tharases

  I want to only let "right" people watch those videos. In other words, only registered users that are allowed (by other users, ie, friends) should see videos. I have a hard retriction for cpu usage in my shared environment, so I can use things like php's readfile.

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• What's best value for make -j

  - by k0re

  Hi, What's the best value of -j switch? I usually set this up to the number of CPU/Cores available. Thanks.

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• windows-7 x86 to x64 upgrade [closed]

  - by small_potato

  is it possible to update my system from windows 7 x86 to x64 without losing data ? cpu architecture is 32bit but I have 4g ram, so to unseal the ram, I have to go with x64.

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• C/C++ variable length automatic array performance

  - by aaa

  hello. Is there significant cpu/memory overhead associated with using automatic arrays with g++/Intel on 64-bit x86 linux platform? int function(int N) { double array[N]; overhead compared to allocating array before hand (assuming function is called multiple times) overhead compared to using new overhead compared to using malloc range of N maybe from 1kb to 16kb roughly, stack overrun is not a problem Thank you

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• C# stop and continue..

  - by Betamoo

  I need some way to do the following efficiently in C#: Make program execution stop until certain value is changed. Note: I do not want to make it with a while loop to avoid wasting cpu power..

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