I had read that you need to change the heap size in the jmeter.bat file (I'm using windows) to increase the memory to be able to test around 500 threads or more. This is the default:
if not defined HEAP (
rem See the unix startup file for the rationale of the following parameters,
rem including some tuning recommendations
set HEAP=-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m
)
I changed the set HEAP=-Xms1g -Xmx1g -XX:MaxMetaspaceSize=256m it to:
set HEAP=-Xms2g -Xmx8g -XX:MaxMetaspaceSize=512m
But when I open Jmeter in GUI mode there is a message in the command line window
Modify current env variable HEAP="-Xms1g -Xmx1g -XX:MaxMetaSpaceSize=256m" in the jmeter batch file
So does that mean the change in the batch file didn't work? Or it does work when running in non-gui mode? Did I miss something to change or what? Thanks in advance.
You don't need to increase the heap unless you face java.lang.OutOfMemoryError: Java heap space error or detect unusually high GC activity
The message basically a form of advice, you will see it even if you have several terabytes of heap space as it is simply hard-coded and will always be shown during GUI startup. If you want to see all Java arguments including heap space settings you can use JSR223 Sampler and the following Groovy code:
java.lang.management.ManagementFactory.getRuntimeMXBean().getInputArguments().each {
log.info("Effective JVM argument: " + "$it")
}
This way you can test whether you changes are applied or not:
Related
I've been able to create dashboards for small amounts of log data (3mb) with JMeter. However, when trying to create dashboards with large amounts of data (35mb), jmeter will throw a java.lang.OutOfMemoryError: Java Heap Space.
So far I've tried to create an environment variable called JVM_ARGS=-Xms1024m -Xmx10240m but I still do not have enough space.
Is there anything else I can try to create these dashboards? Or is there a way to reduce the number of entries that get written to the log file?
Thank you!
There are 2 possibilities :
Option 1 : your JVM options are not taken into account. Show the first lines or all content of jmeter.log
Option 2 : you have added some dynamic parameter to your http requests that has created a lot of different (name) SampleResult
Edit 8 october 2018:
Root cause was point Option 2
Make sure you've really created the environment variable and it has the anticipated value, double check this by running the following command in the terminal window where you will be launching JMeter from:
echo %JVM_ARGS% for Windows
echo $JVM_ARGS for Linux/Unix/MacOS
You should see your increased JVM heap settings
Make sure to use either jmeter.bat for Windows or jmeter.sh for other operating systems wrapper script
Make sure to use 64-bit version of JRE as 32-bit will not be able to allocate more than 3G heap
Make sure you can execute java command with your 10G heap
java -Xms1024m -Xmx10240m -version
you should see your Java version
Try running ApacheJMeter.jar executable directly:
java -Xms1024m -Xmx10240m -jar ApacheJMeter.jar -g result.jtl -o destination_folder
If nothing helps be aware that you can generate tables/charts using JMeterPluginsCMD Command Line Tool (it is not a part of standard JMeter installation, can be installed using JMeter Plugins Manager)
I'm running a Java program inside a Docker container that has a hard memory limit of 4GB. I've set the max heap to 3GB but still the Java program exceeds the limit and gets killed (OOMKilled).
My question is: How can I configure Java to respect the set container limit and throw an OutOfMemoryException instead of trying to allocate beyond the limit and get its ass kicked by the host kernel?
Update: I'm an experienced Java developer and have a fair understanding of the JVM. I know how to set the max heap, but I wonder if anyone knows of a way to set a limit to the total memory that the JVM process claims from the OS.
When a Java application is executed inside a container, the JVM ergonomics (which is responsible for dynamically assign resources based on the host's capabilities) does not know it is running inside a container and it calculates the number of resources to be used by the Java app based on the host that is executing your container. Given that, it does not matter if you set limits to your container, the JVM will take your host's resources as the base for doing that calculation.
From JDK 8u131+ and JDK 9, there’s an experimental VM option that allows the JVM ergonomics to read the memory values from CGgroups. To enable it you must pass the following flags to the JVM:
-XX:+UnlockExperimentalVMOptions and -XX:+UseCGroupMemoryLimitForHeap
If you enable these flags, the JVM will be aware that is running inside a container and will make the JVM ergonomics to calculate the app's resources based on the container limits and not the host's capabilities.
Enabling the flags:
$ java -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -jar app.jar
You can dynamically pass the JVM options to your container with ENV variables.
Example:
The command to run your app would like something like:
$ java ${JAVA_OPTIONS} -jar app.jar
And the docker run command needs to pass the ENV variable like this:
$ docker run -e JAVA_OPTIONS="-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap" myJavaImage
Hope this helps!
In addition to Fabian Rivera's answer I've found that Java 10 has good support for running in containers without any custom startup parameters. By default it uses 25% of the containers memory as heap, which might be a bit low for some users. You can change this with the following parameter:
-XX:MaxRAMPercentage=50
To play around with Java 10 run the following docker command:
docker run -it --rm -m1g --entrypoint bash openjdk:10-jdk
It will give you a bash environment where you can run executables from the JDK. For instance, to run a small piece of script you can use jrunscript like this:
jrunscript -e "print(Packages.java.lang.Runtime.getRuntime().maxMemory()/(1<<20) + 'M')"
This will show you the size of the heap in MB. To change the percentage of total container memory that is used for the heap add the MaxRAMPercentage parameter like this:
jrunscript -J-XX:MaxRAMPercentage=50 -e "print(Packages.java.lang.Runtime.getRuntime().maxMemory()/(1<<20) + 'M')"
Now you can play around with the sizing of the container and the max percentage of heap.
I use jre-7u40-linux-x64 on SL6.4.
Server with more than 30Gb of RAM. User's memory limits sets to several gigabytes, but
command java returns error.
"Not enough memory heap..."
Under root it's ok and -XshowSettings:vm shows that memory size is automaticaly estimated.
Under user with options -Xmx256m it's ok also.
So is it possible to set the property(-Xmx256m) permanently?
I tried environtment variables (JAVA_OPTS,JAVA_OPTIONS) and jvm.cfg. With no results.
Any advices and keywords?
Thank you.
JAVA_OPTS / JAVA_OPTIONS do not help: Running java with JAVA_OPTS env variable
However, if you want such feature, you can create a simple shell script.
A script called java in a location that is in user's PATH environment variable before the actual java binary should do the trick:
#!/bin/bash
/usr/local/java/oracle/bin/java "$JAVA_OPTS" "$#"
I'm currently having this problem where I am executing a query that will load large of records. At first execution, it is successful, but when I
execute again, I am having java heap size out of memory.
I Know I can increase java heap size using command line, but that requires a compiled jar file.
But I am currently on the development process, so how can I increase java heap size in that case?
Im using Elipse as my IDE.
Thanks for any response.
It doesn't require a compiled jar file. Choose Run - Run configurations... - Select your run configuration - Arguments tab. Then enter the appropriate command line argument in the VM arguments text box: -Xmx1024m for example.
You can modify the eclipse.ini file located inside of our eclipse directory .There you will find Xms40m Xmx256m parameter with some value , you can increase it to Xms256m Xmx1024m . Then check whether outofmemory error is still there . If its there then try tuning these parameter slightly increasing and check.
Apperently that was not enough for an answer... well, let me just copy the text from those answers instead :S
You can use the environment variable _JAVA_OPTIONS to set the default heap size. This will change the heap size for all Java programs. Like this:
export _JAVA_OPTIONS="-Xmx1g"
I have an upload files scenario in my project. When I'm trying to upload the large files it's giving me an OutOfMemory error. That error is related to Java heap size.
How can you increase the heap size in Java and which file do I need to alter for this? I'm using jboss 5.1 server for running my application.
You can set it as JVM arguments the usual way, e.g. -Xms1024m -Xmx2048m for a minimum heap of 1GB and maximum heap of 2GB. JBoss will use the JAVA_OPTS environment variable to include additional JVM arguments, you could specify it in the /bin/run.conf.bat file:
set "JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx2048m"
However, this is more a workaround than a real solution. If multiple users concurrently uploads big files, you'll hit the same problem sooner or later. You would need to keep increasing memory for nothing. You should rather configure your file upload parser to store the uploaded file on temp disk instead of entirely in memory. As long as it's unclear which parser you're using, no suitable answer can be given. However, more than often Apache Commons FileUpload is used under the covers, you should then read the documentation with "threshold size" as keyword to configure the memory limit for uploaded files. When the file size is beyond the threshold, it would then be written to disk.
On wildfly 8 and later, go to /bin/standalone.conf and put your JAVA_OPTS there, with all you need.
Edit the following entry in the run.conf file. But if you have multiple JVMs running on the same JBoss, you might want to run it via command line argument of -Xms2g -Xmx4g (or whatever your preferred start/max memory settings are.
if [ "x$JAVA_OPTS" = "x" ]; then
JAVA_OPTS="-Xms2g -Xmx4g -XX:MaxPermSize=256m -Dorg.jboss.resolver.warning=true
Use -Xms and -Xmx command line options when runing java:
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
For more help type java -X in command line.
I have mentioned the configuration changes needed for the increase of heap size in Windows or Linux environments.
Linux:
bin/standalone.conf
Check for the following line,
JAVA_OPTS
and change it accordingly to suit your heap size needs
-Xms1303m: initial heap size in megabytes
-Xmx1303m: maximum heap size in megabytes
JAVA_OPTS="-Xms1024M -Xmx2048M -XX:MaxPermSize=2048M -XX:MaxHeapSize=2048M"
Windows:
bin/standalone.conf.bat
JAVA_OPTS="-Xms1024M -Xmx2048M -XX:MaxPermSize=2048M -XX:MaxHeapSize=2048M"
Now restart the server and it will work without prompting any heap size errors.
For more information you can refer this link below.
https://access.redhat.com/documentation/en-us/jboss_enterprise_application_platform/5/html/getting_started_guide/adjust_memory_settings
Look in your JBoss bin folder for the file run.bat (run.sh on Unix)
look for the line
set JAVA_OPTS, (or just JAVA_OPTS on Unix) at the end of that line add -Xmx512m. Change the number to the amount of memory you want to allocate to JBoss.
If you are using a custom script to start your jboss instance, you can add the set JAVA_OPTS option there as well.
In my case, for jboss 6.3 I had to change JAVA_OPTS in file jboss-eap-6.3\bin\standalone.conf.bat and set following values -Xmx8g -Xms8g -Xmn3080m for jvm to take 8gb space.
Add following option in jboss in bin/standalone.conf.bat
set "JAVA_OPTS=-Xms1G -Xmx1G -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=1024m"
What to change?
set "JAVA_OPTS=%JAVA_OPTS% -Xms1024m -Xmx2048m"
Where to change? (Normally)
bin/standalone.conf(Linux) standalone.conf.bat(Windows)
What if you are using custom script which overrides the existing settings? then?
setAppServerEnvironment.cmd/.sh (kind of file name will be there)
More information are already provided by one of our committee members!
BalusC.
You can increase or set the heap size configuration i.e. -Xms/Xmx or any other JVM options in the JBoss application server in JAVA_OPTS JVM options in standalone.conf(Linux) & standalone.conf.bat file in Windows.
JAVA_OPTS="-Xms2048M -Xmx2048M"