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  • LInux C++: how do profile time wasted due to cache misses?

    - by anon
    I know that I can use gprof to benchmark my code. However, I have this problem -- I have a smart pointer that has an extra level of indirection (think of it as a proxy object). As a result, I have this extra layer that effects pretty much all functions, and screws with caching. Is there a way to measure the time my CPU wastes due to cache misses? Thanks!

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  • WebClient and Gzip compression is faster?

    - by Yozer
    I writting an application which is using WebClient class. Adding something like that: ExC.Headers.Add("Accept-Encoding: gzip, deflate"); where ExC is: class ExWebClient1 : WebClient { protected override WebRequest GetWebRequest(Uri address) { HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address); request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate; return request; } } It will be a diffrence in speed when i will be using encoded response?

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  • Caching images with asp/http

    - by Dmitry Makovetskiyd
    I want to cache all the images on my site, so I used this code: <%Response.AddHeader "Expires","Tue, 2 October 2013 00:00:00 GMT"%> The problem is that google says the images are not cached, whenever I go to this site: https://developers.google.com/speed/pagespeed Also in chrome, I can see that it gives a Get response for all the images. Why is that and how can I cache the images for the next year.

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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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  • Any Javascript optimization benchmarks?

    - by int3
    I watched Nicholas Zakas' talk, Speed up your Javascript, with some interest. I liked how he benchmarked the various performance improvements created by various optimization techniques, e.g. reducing calls to deeply nested objects, changing loops to count down instead of up, etc. I would like to run these benchmarks myself though, to see exactly how our current browsers are faring. I guess it wouldn't be too difficult to cook up some timed loops, but I'd like to know if there are any existing implementations out there.

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  • Possible to distribute or parallel process a sequential program?

    - by damigu
    In C++, I've written a mathematical program (for diffusion limited aggregation) where each new point calculated is dependent on all of the preceding points. Is it possible to have such a program work in a parallel or distributed manner to increase computing speed? If so, what type of modifications to the code would I need to look into?

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  • Money vs. Decimal vs. Float Performance issues (SQL data types for Currency value)?

    - by urz shah
    What data type should be selected in case of Currency value column in SQL server. I have read some where on web Working on customer implementations, we found some interesting performance numbers concerning the money data type. For example, when Analysis Services was set to the currency data type (from double) to match the SQL Server money data type, there was a 13% improvement in processing speed (rows/sec). Is it true??

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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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  • Selecting from a Large Table SQL 2005

    - by Eugene
    I have a SQL table it has more than 1000000 rows, and I need to select with the query as you can see below: SELECT DISTINCT TOP (200) COUNT(1) AS COUNT, KEYWORD FROM QUERIES WITH(NOLOCK) WHERE KEYWORD LIKE '%Something%' GROUP BY KEYWORD ORDER BY 'COUNT' DESC Could you please tell me how can I optimize it to speed up the execution process? Thank you for useful answers.

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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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  • Unlimited Online File Storage

    - by AmeL
    Well, I would like to build a file hosting website just like other already did, but it is going to be something different by adding search engine, allowing download and upload in full speed for any user, and so on. Unfortunately the web hosting plans, which declared to support UNLIMITED SPACE rarely allows me to host files on those space. So what I need is the unlimited file storage service which could host all of my users' files. I found Amazon S3, already provides such service, but could anybody recommends me for other better ?

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  • How to Embed thumbnails in images

    - by user198222
    I have a bunch of 200X120 thumbnails and a bunch of high quality images, Apparently when I just resize the thumbnails with img size the quality suffers, so we are loading two images from the server the image thumbnail and the actual, I am just trying to optimize my site for speed a little saw someone mention embedding thumbs in the image, does anyone know a program that does that? Is this the best way to achieve my goal of high quality thumbnails?

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  • How can I use Action Script 3.0 to make random placed Symbols fly by?

    - by William Calleja
    I'm trying to make a simple animation with Flash CS4 and Action Script 3.0 to make a number of Symbols fly by from right to left constantly. What I want is that once a symbol has reached the end of the screen it is destroyed and another one is placed at the start position. I intend to give each symbol a random speed and create a random symbol each time one is 'destroyed'. Any clues where I can start?

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