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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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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'm building a Java application that will run on a battery-powered, cellular-enabled device (not a mobile phone by the way), and needs to send commands to a server.
These commands are in the form of JSON-objects, so they can easily be serialized and deserialized.
As internet connectivity may not be completely reliable, and the battery of the device may run out, I need a way of saving my commands to disk in case the battery runs out (which could, in some cases, cause power to switch off without warning).
The commands can be 'worth' a few euros a piece, so it's important that I take every precaution (within certain bounds of course) to make sure no commands are lost. Sending a command twice is not a problem, as every command is tagged with a GUID, and my server will make sure duplicates are ignored. The queue may contain up to a thousand commands, but most of the time it will be empty.
What I'm actually looking for is a Queue-like (FIFO) object with a backing file store that is made to survive an instant crash. I need to be able to peek at the next in line, and remove it after processing is finished.
Up to now, I've been working with MapDB 3.0, but the documentation is a bit confusing as to how to create a queue-like object. And besides, it seems to be a bit much for what I'm trying to achieve
You could have a directory of files. One file per message. The file name could be a timestamp or name which records the ordered. A directory with 1000 files should still perform ok.
Once you close the file, it should be persisted to disk, although exact how safe any operation is will depend on the device and how it is implemented.
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Closed 7 years ago.
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I'm currently running a Java app over a network and I'm using one system as the server. The clients can create documents such as receipts and other things but they're all stored on a folder in the server system. But now I have an issue the folder had to be shared and it's permission set to read and write for every client to be able to read and write to that folder and cos of this users can directly access this folder on the network and see the files or even delete the files in the folder but I don't want this.
So is it possible to have a folder where all clients can read or write files to on the server system but cannot directly access the folder through the network?
Normally you would have a service, such as a web service which allows users to upload files. There is command line tools to do this as well as being able to do this with a web browser. There is a number of way of doing this based on your preferred choice.
Another approach is to give each use a folder they and only they can access (your application also). One folder per client/user. You can monitor these folders and detect when a new file appears and move it to a folder only your can access.
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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 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.