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  • Java reduce CPU usage

    - by steve
    Greets- We gots a few nutters in work who enjoy using while(true) { //Code } in their code. As you can imagine this maxes out the CPU. Does anyone know ways to reduce the CPU utilization so that other people can use the server as well. The code itself is just constantly polling the internet for updates on sites. Therefore I'd imagine a little sleep method would greatly reduce the the CPU usage. Also all manipulation is being done in String objects (Java) anyone know how much StringBuilders would reduce the over head by? Thanks for any pointers

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  • High CPU - What to do.

    - by Udi Kantzuker
    I have a high CPU problem with MYSQL using "top" ( linux ) shows cpu peaks of 90%. I was trying to find the source of the problem, turned on general log and slow query log, The slow query log did not find anything. The Db contains a few small tables and one large table that contains almost 100k rows, Database Engine is MyIsam. strange thing i have noticed that on the large table, select, insert are very fast but update takes 0.2 - 0.5 secs. already used optimize and repair and no improvement. the table is being updated frequently, could this be the source of the high CPU% ? What can i do to improve this?

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  • C read part of file into cache

    - by Pete Jodo
    I have to do a program (for Linux) where there's an extremely large index file and I have to search and interpret the data from the file. Now the catch is, I'm only allowed to have x-bytes of the file cached at any time (determined by argument) so I have to remove certain data from the cache if it's not what I'm looking for. If my understanding is correct, fopen (r) doesn't put anything in the cache, only when I call getc or fread(specifying size) does it get cached. So my question is, lets say I use fread and read 100 bytes but after checking it, only 20 of the 100 bytes contains the data I need; how would I remove the useless 80 bytes from cache (or overwrite it) in order to read more from the file.

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  • Force a page cache of Ajax content

    - by Webnet
    I have a page that is an search where the results are loaded via ajax. It then lists products on a page and you can click to view each product. I'd like to change this page where after you view a product if you click "back" on your browser it'll load the cache instead of forcing the user to search again. How can I achieve this? I currently have.... header('Cache-Control: private, max-age:3600'); header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + 3600)); and it doesn't load the cache

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  • Python profiler and CPU seconds

    - by dude
    Hey, I'm totally behind this topic. Yesterday I was doing profiling using Python profiler module for some script I'm working on, and the unit for time spent was a 'CPU second'. Can anyone remind me with the definition of it? For example for some profiling I got: 200.750 CPU seconds. What does that supposed to mean? At other case and for time consuming process I got: -347.977 CPU seconds, a negative number! Is there anyway I can convert that time, to calendar time? Cheers,

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  • Kworker, what is it and why is it hogging so much CPU?

    - by davorao
    I recently upgraded to the Kubuntu Natty Beta 1 and I've been having a lot of issues with the process kworker. At moments it uses almost half my CPU. Also, strangely enough it seems to affect my USB ports; whenever I plug in an USB drive, the process kworker goes into hyperdrive, leaving me unable to work. I have thought about filing a bug but since I haven't even found any reasonable explanation on what kworker is I figured I should find out first.

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  • mod_cache serving the wrong content

    - by J. Pablo Fernández
    I'm trying to use mod_disk_cache to speed up a web site that is running on WordPress. Whenever I enable it with CacheEnable disk / and the rest being the stock Ubuntu configuration I start to get the wrong results. When I see the main page it's fine, but when I go to a specific post I get a RSS feed instead. Like if the cache is returning the wrong content. I've disabled my RewriteRules as it seems mod_cache doesn't work with that. I'm not even sure where to start to debug such a thing. Any ideas?

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  • PHP processes run one at a time, always taking 100% of one core

    - by Derek Kurth
    We have seven websites written in PHP running on a Windows 2008 server with IIS 7.5. They are all very slow right now. When I look in Task Manager, I see around 10 php-cgi.exe processes, and they are all taking 0% of the CPU, except one, which is taking 25%. It's a quad-core server, so it's taking 100% of one core. If I watch for a few seconds, the process taking 25% will go to 0%, and a different php-cgi.exe process will jump to 25%. So all the php-cgi.exe processes are just lined up, waiting on a single core, and each process uses 100% of the processor when it can. Each of the 7 sites is in its own application pool in IIS, and we're using FastCGI. The PHP version is 5.3. Any ideas? Thanks!

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  • Changing frontend cache

    - by Utsav
    Our architecture consists of a front-end cache that most read only users obtain their data from directly. The front-end cache sits in front of a farm of webservers that serve pages written in PHP. We need to be able to detect certain conditions at the front-end cache level and pass those values through to the back-end via HTTP headers. For example we would like to manually tag the carrier network based on the IP address. So, for incoming traffic if the user is say coming from an IP address in the range of "41.202.192.0"/19 we would tag them as being a Orange Cameroon user by setting the appropriate HTTP request header, e.g., X-Carrier = "Orange Cameroon". Based on the setting of this header we would like to vary the cache and serve a different banner to the end user. How would you go about doing this? Keep in mind that we don't want to pollute the cache and we also don't want to create too many small cache segments. Assumptions: You can assume that the X-Carrier has already been detected in our cache. So, for the purposes of your test you can just set this value manually in your example script.

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  • JBossCacheService: exception occurred in cache put error occurred after changing cache mode to REPL_

    - by logoin
    Hi, we have a horizontal cluster set up on JBoss 4.2. The session replication worked fine until we changed cache mode from REPL_ASYNC to REPL_SYNC to fix a issue. We started to see warning for some session failovers: [org.jboss.web.tomcat.service.session.InstantSnapshotManager.ROOT] Failed to replicate session java.lang.RuntimeException bc [local7.warning] JBossCacheService: exception occurred in cache put ... org.jboss.web.tomcat.service.session.JBossCacheWrapper.put(JBossCacheWrapper.java:147) org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:315) org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:125) Does anyone have any idea why this happen and how to fix it if we want to still use REPL_SYNC? Any help is appreciated. Thanks!

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  • How can I use System.Web.Caching.Cache in a Console application?

    - by Ron Klein
    Context: .Net 3.5, C# I'd like to have caching mechanism in my Console application. Instead of re-inventing the wheel, I'd like to use System.Web.Caching.Cache (and that's a final decision, I can't use other caching framework, don't ask why). However, it looks like System.Web.Caching.Cache is supposed to run only in a valid HTTP context. My very simple snippet looks like this: using System; using System.Web.Caching; using System.Web; Cache c = new Cache(); try { c.Insert("a", 123); } catch (Exception ex) { Console.WriteLine("cannot insert to cache, exception:"); Console.WriteLine(ex); } and the result is: cannot insert to cache, exception: System.NullReferenceException: Object reference not set to an instance of an object. at System.Web.Caching.Cache.Insert(String key, Object value) at MyClass.RunSnippet() So obviously, I'm doing something wrong here. Any ideas? Update: +1 to most answers, getting the cache via static methods is the correct usage, namely HttpRuntime.Cache and HttpContext.Current.Cache. Thank you all!

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  • MySQL 5.5.9 Query Cache not working.

    - by thepearson
    I am running MySQL 5.5.9 x86_64 RPM as downloaded from mysql.com. Running on CentOS 5.5 Xen DomU. I have enabled the Query_cache however MySQL NEVER uses it. All of my tables are InnoDB. Why is the Qcache never hit? Here are my settings. mysql> SELECT VERSION(); +-----------+ | VERSION() | +-----------+ | 5.5.9 | +-----------+ 1 row in set (0.00 sec) mysql> SHOW VARIABLES LIKE '%query_cache%'; +------------------------------+-----------+ | Variable_name | Value | +------------------------------+-----------+ | have_query_cache | YES | | query_cache_limit | 2097152 | | query_cache_min_res_unit | 4096 | | query_cache_size | 536870912 | | query_cache_type | ON | | query_cache_wlock_invalidate | OFF | +------------------------------+-----------+ 6 rows in set (0.00 sec) mysql> show status like 'Qcache%'; +-------------------------+-----------+ | Variable_name | Value | +-------------------------+-----------+ | Qcache_free_blocks | 1 | | Qcache_free_memory | 536852824 | | Qcache_hits | 0 | | Qcache_inserts | 0 | | Qcache_lowmem_prunes | 0 | | Qcache_not_cached | 7665775 | | Qcache_queries_in_cache | 0 | | Qcache_total_blocks | 1 | +-------------------------+-----------+ 8 rows in set (0.00 sec)

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  • 32-bit and 64-bit CPU/OS [closed]

    - by learnerforever
    Possible Duplicates: how to know if a computer is 32 bit or 64 bit 32-bit v/s 64-bit systems Hi, This 32-bit and 64-bit thing baffles me. It's not often that I run across it, but when I do, it baffles me. Like when I want to download software from http://www.google.com/ime/transliteration/ it asks me which version to download. I have win XP running on my thinkpad machine. How do I find out if my hardware is 32-bit or 64-bit. Also, how do I find if OS is 32-bit or 64-bit and thus how to know which version to download from this link. Also for any installed application say firefox, how do I know which bit version is installed. How popular are 64-bit hardware/OSs?. Are all the new CPUs and OSs supporting 64-bit and 32-bit for backwards compatible or 64-bit is still a luxury? Thanks,

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  • Refresh file access time under Linux / Discard disk read cache

    - by calandoa
    I am making use of the access time to analyse some build process, but it is not working the way I want: the access time is updated the first time I read the file, then it stays the same for a long while, or until the next reboot. For instance: $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 10:03 some_file $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time is updated # waiting a few minutes... $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time has not been updated :( I suppose that the file is buffered by Linux in the free memory, the only this copy is accessed the subsequent times for speed reasons. A solution would be to discard the buffers in memory. After searching some forums, I found: sync echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches But it is not working, it seems that it only sync up the write buffers, not the read ones. May be it is due to some custom kernel configuration on my distro (fedora 9)? Or I am missing something here? Is there a way to achieve this access time refresh? Note also that I do not want to simulate some writes on my entire file tree. Because I am using some makefile based build system, this will cause the entire project to be build again.

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  • DNS cache-on-demand server in Win7

    - by Andrew Heath
    I live in a country that enjoys manipulating DNS entries for fun and profit. For various reasons, I cannot surf with a VPN running 100% of the time. Because some sites are only blocked via DNS spoofing, it would be very handy if I could run a local DNS server that I could update on command during active VPN sessions. Is this granularity possible on Win7? Most of the DNS server related posts on SU are regarding the more config-friendly Linux platforms...

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  • Where does Tomcat cache my taglib .jar files?

    - by NogginTheNog
    I'm deploying a .jar file to a tomcat instance (we're running 6.0.18 on Redhat linux) and according to the log output the old .jar is still being used. I've restarted everthing I can think of, have deleted the work directory etc.etc. but to no avail. I'm no tomcat expert, so here's my question: where should I look for to ascertain if tomcat is using a cached jar and how should I prevent it from doing so?

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  • CPU?: Not responding

    - by James
    I'm attempting to build a system for co-location. I've been running into issues while trying to install CentOS 6.3 System Specs: Motherboard: ASUS m5a99x Process: AMD FX-8120 (8-core Bulldozer) Memory: 2x 4gb G-Skill 2133 running at 1600 I keeps giving me an error message: CPU1: Not Responding. CPU2: Not Responding. CPU3: Not Responding. CPU4: Not Responding. CPU5: Not Responding. CPU6: Not Responding. Then it instantly restarts. I have tried installing it from USB, Multiple DVDs, Multiple Distros. I have also in the bios attempted to disable cores. I was able to disable 2/3 4/5 6/7. I have also ensured that there is zero overclocking. The system works fine in a windows environment. I'm out of ideas.

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  • Is a Hyperthreaded CPU more powerful and more efficient than a Dual-core CPU? [closed]

    - by user1811864
    which computer to choose with Pentium processor hello they are getting rid of the old computer equipment in the office and i have to choose the computer to take home i get first choice to pick. -15 inch lcd screen 4 gb of ram core 2 duo dual Core E8400 3.00 GHz dvd writer windows vista/ linux -15 inch crt monitor with 2 gb ram and pentium 4 2 ghz single core HT technology windows xp hardisks both 250 GB my friend is telling me to choose the second one Pentium single core HT because he told me it runs faster becuase of HT technology and cooler and consumes less current electricity so it wont get overheated because it has HT technology so it's high definition for encoding and watching HD movies and HD sound and is like a gaming pc to play internet games. And also he said the dual core 8400 runs at 3 ghz compared to the 2 ghz so it heats very much because of the two extra cores so it takes more current raising electricty bills and is not good for gaming and watching HD movies and internet flash animations and games because of getting heated everytime. And he wants to choose and take the E8400 because he has air conditioning at home so it will be safe from heating. So which one computer should i take is it really faster because of the HT High definition technology and will i be able to play internet flash card games better and watch good HD movies Youtube etc and play all the music and songs.

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  • Bugzilla random lag and CPU usage

    - by Serty Oan
    Here is the configuration : Bugzilla (3.4.2) application running on a Ubuntu server 8.04 with Perl 5.8.8. Here is the problem : Sometimes (randomly), pages take very long to load. It can be any of the login page or query.cgi page or buglist.cgi... etc... Using top on the server, I tried to see what was wrong, and saw that sometimes a bugzilla script would use 30% memory and last pretty long (1 to 5 seconds) and sometimes not even show in the list because it responded too quickly or just use 2%. The mysqld process does not seems to be the problem.

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  • 100% CPU load on Ubuntu 10.04.3 LTS 64bit

    - by deadtired
    I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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  • CPU temperatures high on new build after gaming

    - by Reznor
    My friend had a problem with his computer a while back. His games were crashing, even within the menus. He was stumped as to what the problem was, so I posted on here requesting help. He found out the day later, when his computer would start up but wouldn't display anything on the screen. His video card must have came screwed up. So, he got a replacement. Now, there's a new problem. His temperatures, which were acceptable before, are now insanely high. His GPU temperature runs 70-80c, which is understandable considering he's running his games maxed out, but the real problem here is his processor and motherboard temperatures. All four of his cores are running at 88-90c after coming out of a game. His motherboard temperature was also 70c at one point. In terms of cooling, his case should definitely be adequate. He has an Antec Twelve Hundred. He's using stock fans. The cable management in his case is very good; better than average. He's using the stock heatsink with the processor too, but note, it was fine before the replacement, so it isn't like there's some inherent problem. He has checked the case too. Everything's fine! No cables in the way. The heatsink is seated properly. He turned his case fans up to high, as well, but the temperatures are persisting. Could the processor be overheating due to running games maxed out? Any ideas?

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