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I am working on Traveling Salesman Problem algorithm. When I execute the program it takes 3-4 hours to finish (not a big surprise for TSP). However, my Task manager tells that CPU is used only by 5% and ram by 27%. Is it possible to add more CPU resource for program execution, without modifying the code (I am not allowed to modify it)?
When you run the java program out of eclipse, it runs as an application on its own and not inside eclipse. There is no way to limit or allow more resources inside java. The only way to do it is:
From a Virtual Machine
When your code can utilise only a limited number of cores and you run it on a multi core machine, in this case modifying the code would be able to utilise more resources.
Since for you none of the above apply - no it's not possible for you.
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I'm on this for a really long time. I need to have JRE 6 running on a new nonactivated Windows server 2019 essentials to be able to use a very old remote controller for some servers (old IBM & DELL racks).
No matter what version of java I install, it's just not running. I don't see it in the bottom right corner or in the running services. I know it seems very basic but I couldn't find a solution online.
Am I missing something? All I could find online is suggestions to add java to the environment variables but that is for a different issue. I tried it desperately but of course it didn't solve the problem.
Java, or more precisely the Java Virtual Machine (JVM), is not something that runs in the background. JVM is used to start specific applications. How the java.exe or similar executable will be resolved and invoked will depend on the specific application.
What you usually see in the Windows task tray area is a the Java update checker (Jucheck.exe). Whether or not this service is present will depend on selected installation options. It also might be that a very old Java 6 simply does not ship it.
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There's very little information about the /tmp/ folder which App Engine can use to write files. https://cloud.google.com/appengine/docs/standard/java/runtime-java8#Java_The_sandbox
The main question is if this is isolated per instance? And if an instance saves a file, starts a push queue, will the push queue be ran by the same instance and able to read the file?
Thanks
The /tmp directory actually exists in memory, so it is local to each GAE instance. From the doc you quoted:
Files in /tmp will consume the memory allocated to your instance.
Typically the execution of a push queue task is not guaranteed to happen on the same instance that enqueued the task.
This guarantee can only exist in a very specific, rather not typical case: you use manual scaling with exactly one instance running and that instance both enqueues the task and (later) processes it.
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I have a java program that write some temporary files in the temp directory. The temp directory is on a SSD. The write operation is normally very fast. But now with some specific sample data it is very, very slow and the CPU of the Antimalware Service Executable is high (30% - 35%). The write speed is approx. 50 KB/s.
If I set a breakpoint on the write loop the CPU of the Antimalware go to 0%. If I continue then the CPU of the Antimalware go to high. I can repeat this multiple time.
It look like the Antimalware is scanning my temporary data intensively. Why occur this and how can I prevent this?
To prevent scanning you can exclude files from being scanned by file name, directory name, file extension of the associated process. To do so, open “Windows Security Essential” or “Windows defender” (type it in the Start Menu).
Then go to Settings -> Excluded files and locations.
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I'm interested, is there any good method for running java programms (for example tests) at any specific time on Windows?
Just can't find anything good as of now.
You can either:
Schedule java programs externally
For example via Windows Task Scheduler, windows version of crontab, etc. The scheduler invokes a script which runs your java program.
Schedule java programs inside the jvm
For example quartz scheduler. Your java program is running all the time, and it "wakes up" to perform specific actions.
Integrate into a specific tool
Since you mention running tests you could configure them to run in Jenkins.
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I'm executing a long running batch process in IBM WebSphere Application Server v8.5.5.1, which is getting data from a ECM repository, and afterwards converting it to PDF document. It runs about 20k of small documents, which compose the whole batch.
Right now I'm getting about 20 docs/sec, but the System is only about 45-55% cpu usage, so something is preventing me to get it to work at full throttle
I'm running in Windows 2012 R2 Standard on an HP Proliant DL385p Gen8 (32GB RAM, 2 x AMD Opteron 6272 each with 16 2.1GHz cores )
All resources are locally stored, so almost no network traffic should be bothering.
I've also tried to write the PDF output documents to a RAMDISK, but there's no improvement at all.
Any ideas of where should I peek to let this process use the whole power of my server?
Thanks!!
PS: Please see attached reference image
CPU Usage graph
I think the actual issue is that you're fully using one CPU but not the other.
The good news is that you can probably easily multithread your application to use both processors; just set up a task queue and play around with the number of worker threads you have until you achieve 100% usage.