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Java Forum / General / March 2006how to find cpu is idle or not???
hi... how to find cpu is idle or not using java programming... bye.. frnds... waiting for ur reply.. master007 wrote On 02/16/06 12:38,: > hi... > > how to find cpu is idle or not using java programming... > bye.. > frnds... > waiting for ur reply.. static boolean CPUIsIdle() { return false; } ... because the CPU cannot be idle if it's executing the method. What's your *real* question?  SignatureEric.Sosman@sun.com > static boolean CPUIsIdle() { I would recommend "isCpuIdle()" in stead :-) > return false; > } > >... because the CPU cannot be idle if it's executing >the method. There could presumably be a callback the CPU could invoke when it knows that it otherwise would have been idle though. Cheers Bent D SignatureBent Dalager - bcd@pvv.org - http://www.pvv.org/~bcd powered by emacs > master007 wrote On 02/16/06 12:38,: >> hi... [quoted text clipped - 12 lines] > > What's your *real* question? What if the user has a multi-cpu machine, and the Java code is running on one CPU, but querying a different CPU? ;) - Oliver Oliver Wong wrote On 02/16/06 13:53,: >>master007 wrote On 02/16/06 12:38,: >> [quoted text clipped - 16 lines] > What if the user has a multi-cpu machine, and the Java code is running > on one CPU, but querying a different CPU? ;) That's the sort of clarification I hope he'll offer, along with what he means by "CPU" and by "idle." I also admit to some puzzlement about why he thinks an answer would be useful ... SignatureEric.Sosman@sun.com Sir... iam doing file searcher in hard disk. i have to scan the hard disk... if i scan the comp when it is loaded...system performance will be degraded.. so i want to know wheather cpu is idle or not..? if it is idle..i can use that time ...with causing inconvience to user... I think u Got my Point Sir... ThankU Sir... >so i want to know wheather cpu is idle or not..? you could detect that by creating a very low priority thread that did something inane like compute pi. You check in on it after a second to see how much it has accomplished. If a lot, then the machine is idle. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > Sir... > iam doing file searcher in hard disk. > i have to scan the hard disk... > if i scan the comp when it is loaded...system performance will be > degraded.. > so i want to know wheather cpu is idle or not..? No you don't - you just want to schedule the thread with minimum priority. If the JVM is any good, Java threads are mapped to OS threads, and it'll get run with minimum priority by the OS. Thread.currentThread().setPriority(Thread.MIN_PRIORITY); Alun Harford master007 sez: > Sir... > iam doing file searcher in hard disk. > i have to scan the hard disk... > if i scan the comp when it is loaded...system performance will be > degraded.. > so i want to know wheather cpu is idle or not..? You can't: it's like opening the box except the cat is dead 100% of the time. The code for checking must be executed by the cpu, so when the check runs cpu will always be busy -- running the check. HTH,HAND Dima SignatureSurely there is a polite way to say FOAD. -- Shmuel Metz "Go forth and multiply". -- Paul Martin > Sir... > iam doing file searcher in hard disk. [quoted text clipped - 8 lines] > > ThankU Sir... I made a post about this earlier. See http://tinyurl.com/jvvad (original URL is: http://groups.google.ca/group/comp.lang.java.programmer/browse_frm/thread/3edac1 e4ce9a2ece/ceaa37335d33440e#ceaa37335d33440e ) - Oliver Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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