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C Program High Cpu Usage


Still funny though. #15 Markbnj, Jun 15, 2007 xtknight Elite Member Joined: Oct 15, 2004 Messages: 12,974 Likes Received: 0 This makes me laugh (*p++)+1.144564542315345; What is this, a fraction It also cause significant GUI lag that might not allow you to kill it with task manager. Output N in base -10 Should we kill the features that users are not using frequently, to improve performance? A single word for "the space in between" Are the guns on a fighter jet fixed or can they be aimed? have a peek at these guys

Stay logged in Sign up now! Note: Never do this on a citrix server. We quickly came up with this code to count prime numbers: #include #include void main() { clock_t start, end; double runTime; start = clock(); int i, num = 1, However, that's only of some importance if 2 seconds of CPU usage is considered too much. http://stackoverflow.com/questions/5399184/need-program-that-will-make-the-cpu-run-at-100

Increase Cpu Usage Linux

That's a better approach. share|improve this answer answered Apr 25 '14 at 12:44 ivspenna 734 I have already seen the source code of "cpulimit" but I didn't find out how to make my So if that is an issue one can use something like void main(void) { omp_set_dynamic(0); // In most implemetations omp_get_num_procs() return #cores omp_set_num_threads(omp_get_num_procs()); #pragma omp parallel for for(;;) {} } share|improve Warning: Those are infinite loops, which you may have trouble closing.

Handled below } // This is for READING button else if (n == 0) { // This timeout is okay // This allows us to read the button press as well it's not really sleeping). Example of compact operators in quantum mechanics Is it bad practice to use GET method as login username/password for administrators? Linux Stress The last number (in the finite loop) can be adjusted to adjust the running time.

Both values are signed and uninitialized, so who the hell knows where it will start writing to memory. Do they wish to personify BBC Worldwide? Recreate the ASCII-table as an ASCII-table What is this apartment in which the Terminator fixes himself? just like the one above :) int main(void) { #pragma omp parallel { volatile unsigned x=0, y=1; while (x++ || y++); } return 0; } share|improve this answer edited Mar 22

I think the postfix increment operator binds before the dereference operator. Openmp Why not try to clean that up, allocate 2 gigs of memory (32 bit os which is all you are allowed to allocate per process) and run your algoritm in valid I'm running the program from the command line in Cygwin from XP, and it's cross-compatible with Linux. asked 1 year ago viewed 340 times active 1 year ago Related 28How do I use mqueue in a c program on a Linux based system?0How do I receive a signal

How To Increase Cpu Usage For Testing In Linux

So your program doesn't make other things slower, but if there is nothing else to do (other processes waiting for IO e.g.), it'll still get the most possible CPU time. What's the male version of "hottie"? Increase Cpu Usage Linux The program just wastes CPU (loop), no need to develop something special, just want that it program waste a fixed percentage of CPU –Mitchapp Apr 29 '14 at 17:36 #pragma Omp Parallel You'll need to run multiple instances like the bat :goto script.

All rights reserved. http://computerhelpdev.com/cpu-usage/reduce-cpu-usage-program.php While running the program, I notice that the CPU usage is 100%, with my application stealing 97% of it. This is platform specific and is better asked in newsgroups for the specific platforms. Jul 19 '05 #8 P: n/a Eternally "Rolf Magnus" wrote in message news:bo*************@news.t-online.com... Stress Cpu Linux

Properly, I think it should be: int main () { int * i; float * p; while (p == p){ *(p++)+1.144564542315345; *(i++)+1; } } Oh, and FWIW, doesn't modulus have one That's a better approach. I use gprof to profile the program, nothing really helps. http://computerhelpdev.com/cpu-usage/cpu-usage-program-java.php Edit: never mind, ++ takes precedence over * but if thats what you were doing it should have crashed nearly immediately as soon as you read from an unallocated page.

If you don't want it to use 99% cpu than you need to use a blocking operation in the main loop. Prime95 more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed My homepage Advice: Take only as directed - If symptoms persist, please see your debugger Linus Torvalds: "But it clearly is the only right way.

It is a very simple and effective framework for making up parallel programs.

share|improve this answer answered Feb 15 '12 at 23:09 Joel 4,69794865 add a comment| protected by Mysticial Jun 29 '13 at 18:51 Thank you for your interest in this question. He creates expressions but never assigns the results, so they're both nops. I then tried using clock() and making it pause until a certain amount of time had passed like .005 of a second, but the cpu sticks at 100% with that method Since it's real-time, and the graph is constantly adjusting with time, I don't think there's any even that I could use to adjust it.

One they I said I should try ubuntu and here I am. Since you wrote you're writing for cygwin and linux, there is a good chance that you find a posix function that works for both. How big is your hard drive If you want to burn memory, call new [] without delete in an endless loop and listen to your hard drive grind to a halt http://computerhelpdev.com/cpu-usage/c-program-to-find-cpu-usage.php more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

While running the program, I notice that the CPU usage is 100%, with my application stealing 97% of it. Move this part timeout.tv_sec = 0; timeout.tv_usec = 10000; inside the loop before the select() call and it should work as you expect it to, you can move many delcarations inside Something fun to mess with is sorting algorthms, like bubble sorting. #21 Red Squirrel, Jun 27, 2007 Markbnj Elite Member
Moderator Emeritus Moderator Joined: Sep 16, 2005 Messages: 15,688 Likes However, if you just want it on average then you can potentially do it (with a couple of restrictions).

I didn't make it far enough into my programming degree to see trees. Actually, you would need 100ms to be at exactly 10fps, but firstly you cannot sleep for *exactly* 100ms and secondly, you also need some time for calculations. On Windows you Another approach is to take an existing benchmark program for the Cray supercomputer and port it to a modern PC. Useful Searches Recent Posts Menu Forums Forums Quick Links Search Forums Recent Posts Menu Log in Sign up AnandTech Forums: Technology, Hardware, Software, and Deals Forums > Software > Programming >

Jul 19 '05 #18 This discussion thread is closed Start new discussion Replies have been disabled for this discussion. Nice. If the bottleneck in your decompression is CPU usage rather than IO, then that suggests that there is some horrible inefficiency in your decompressor. That's one of my favorite snippets of code. –Zomgie Mar 22 '11 at 23:48 This one uses more like 100000%... –R..

But no, as someone else mentioned, no O/S crash. What would be the best way to achieve that? Your comment belongs in your question above, paste formatted code, select with mouse, click the {} tool at the top left of the edit box. How can I bring my applications CPU usage down to 10%?

now what? more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Don't reply to email address (post here instead) Jul 19 '05 #5 P: n/a Rolf Magnus Eternally wrote: Hey folks, I'm writing a simple C++ application which runs continuously. Thanks in advance for the help!

Of course this program didn't really work with the Crays 8 specialist processors, and that is a whole other issue... Thanks in advance for the help! I noticed that on certain applications like those used to decode video, you can specify how much CPU to use (high priority, low priority...), how is that accomplished?