What is the minimum amount of RAM that the Weblogic Admin Consoel (version 10.3.2) will run under?
256MB is usually a safe bet but for our larger production domains, we use as much as 512mb. In addition to the domain size, your WLDF settings can affect the required heap size.
On a test system, you can probably get away with 128mb.
4 GB
Setting the memory arguments for the WebLogic application servers for SAS® Financial Management
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I am running Apache Guacamole on a Google Cloud Compute Engine f1-micro with CentOS 7 because it is free.
Guacamole runs fine for some time (an hour or so) then unexpectantly crashes. I get the ERR_CONNECTION_REFUSED error in Chrome and when running htop I can see that all of the tomcat processes have stopped. To get it running again I just have to restart tomcat.
I have a message saying "Instance "guac" is overutilized. Consider switching to the machine type: g1-small (1 vCPU, 1.7 GB memory)" in the compute engine console.
I have tried limiting the memory allocation to tomcat, but that didn't seem to work.
Any suggestions?
I think the reason for the ERR_CONNECTION_REFUSED is likely due to the VM instance falling short on resources and in order to keep the OS up, process manager shuts down some processes. SSH is one of those processes, and once you reboot the vm, resource will resume operation in full.
As per the "over-utilization" notification recommending g1-small (1 vCPU, 1.7 GB memory)", please note that, f1-micro is a shared-core micro machine type with 0.2 vCPU, 0.60 GB of memory, backed by a shared physical core and is only ideal for running smaller non-resource intensive applications..
Depending on your Tomcat configuration, also note that:
Connecting to a database is an intensive process.
Creating a Tomcat with Google Marketplace, the default VM setting is "VM instance: 1 vCPU + 3.75 GB memory (n1-standard-1) so upgrading to machine type: g1-small (1 vCPU, 1.7 GB memory) so should ideal in your case.
Why was g1 small machine type recommended. Please note that Compute Engine uses the same CPU utilization numbers reported on the Compute Engine dashboard to determine what recommendations to make. These numbers are based on the average utilization of your instances over 60-seconds intervals, so they do not capture short CPU usage spikes.
So, applications with short usage spikes might need to run on a larger machine type than the one recommended by Google, to accommodate these spikes"
In summary my suggestion would be to upgrade as recommended. Also note that, the rightsizing gives warnings when VM is underutilized or overutilized and in this case, it is recommending to increase your VM size due to overutilization and keep in mind that this is only a recommendation based on the available data.
We are noticing that IBM MobileFirst Server is using High Memory by Java TM Platform SE binary process, after 2 3 days of server start it reach up to 6 GB which cause the server in hang status, then only restart is the solution.
in logs we found below message:
"No buffer space available (maximum connections reached?): connect"
Enviornment: IBm Worklight Server 7.1 and java version is 1.7 64 bit on windows server 2012. hybrid Mobile application running on this server.
It seems that there might be some configuration required can any one advice ?
Lots of information missing... this can be caused by any number of reasons.
Are you in a cluster? if yes, how many servers? how much memory is available to each machine?
How many adapters do you have deployed? What is the value you gave to the serverSessionTimeout property? This for example can cause connections to stay open for a longer time, meaning the server will not "clean/remove" connections... and the more you have open, the more memory you will require.
all of these and more can contribute to how much memory you may need.
See also: http://www-01.ibm.com/support/docview.wss?uid=swg21690707
It mentions DB2, but the idea is - the more connections, the more memory you will need.
About to choose hosting service for a website written in GWT with Java on the server side.
Does anyone have some good guidelines for JVM mem settings. Some hosting services are limiting JVM memory. I was told one JVM per CPU core but what about mem settings?
Best regards,
Niclas Lindberg
Multiple JVM will increase the memory footprint. We used to run single JVM even for 64 core machines. You need to tune your JVM parameters accordingly.
Please see the following links
http://docs.sun.com/source/817-2180-10/pt_chap5.html
http://javahowto.blogspot.com/2006/06/6-common-errors-in-setting-java-heap.html
It depends on the requirements of your app. You can start with a certain size, e.g:
-Xms512m -Xmx512m -XX:PermSize=128m -XX:MaxPermSize=256m
You need to monitor the JVM with JConsole and see if it is good enough. You can adjust the parameters according to your monitor result. Basically, -Xms should be equals with -Xmx which can reduce the CPU overhead for increasing heap size.
My Grails application is running in a development environment. I still didn't go into production, but in any case, is it normal that my Grails application is requiring 230 MB at startup only (with an empty bootstrap and no request handled so far)?
Do you know why this is the case, how to improve memory usage in development mode and, most important, whether it is reduced in production environment?
To answer your questions, yes - it is normal. It's especially normal if you have a lot GSPs in your application. GSPs are runtime compiled so you can speed up their generation by increasing your permgen space.
You can improve memory use and performance in general by making sure that you are passing the '-server' flag when you load your server JVM.
I wouldn't blame all that memory usage just on Grails. Because it uses an embedded Tomcat (Jetty in older versions) there will be a decent amount of overhead even when running an empty application.
IMO, 230MB is a lot of memory use for a Java application. High memory usage is just part of life when writing jvm based applications.
My online Grails applications run in a VPS with only 512MB (which includes a Drupal CMS, Apache, the email services, ... and the Tomcat to run GRails) so you can definitely tune your application to use less memory
I'm thinking of getting my own dedicated server with the following stats:
Processor: Celeron 440 2.0 GHz
Memory: 1 GB
Primary Hard Drive : 160 GB SATA II
This will be running Windows. I have some experience with my local IIS and playing around with servers, but I have never set one up (at least a Windows one) and I've never dealt with DNS/backup/security issues.
My question has two parts:
Will this server be able to run Windows 2008, SQL Server, and possible Exchange on it without trouble. I'm worried about the processor and RAM.
Are there any guides/tutorials that talk about how to admin a windows server from start to finish. (I'm looking for something like the FAQs slicehost has for *nix based servers).
You WILL run into a problems with RAM. Refer to MS documentation and minimum requirements (SQL Server and Exchange). Also please mind that new releases of Exchange run only on 64bit systems.
Personally I would recommend installing CORE version of W2K8 if you plan to go with your described configuration.
It depends from user load. If you have about 1k unique users / month this means that probably, you will have 30 users per day - roughly 1 per hour. I think you will use more CPU working on this computer personally. So it really depends from user load.
If I were you, I would add more RAM to have something about 4 GB. RAM is the cheapest upgrade available.
You state "I've never dealt with DNS/backup/security issues."
I would suggest to you that these are the most important issues. You need to stay on top of security, applying security patches, insuring firewalls are properly configured etc.
Having been called after the fact for websites that have been hacked, I can tell you it is not pretty. Learn all you can before you stand up this server on the internet.