Skip to main content
X
xfreeman89x
Inspiring
February 9, 2016
Answered

Coldfusion 11 JVM settings

  • February 9, 2016
  • 2 replies
  • 3746 views

Hi,

I wonder if my JVM parameters on Coldfusion 11 are correct. My actual parameters are:

-server -XX:MaxMetaspaceSize=192m -XX:+UseParallelGC -Xbatch -Dcoldfusion.home={application.home} -Djava.security.egd=/dev/urandom -Duser.language=en -Dcoldfusion.rootDir={application.home} -Dcoldfusion.libPath={application.home}/lib -Dorg.apache.coyote.USE_CUSTOM_STATUS_MSG_IN_HEADER=true -Dcoldfusion.jsafe.defaultalgo=FIPS186Random -Dorg.eclipse.jetty.util.log.class=org.eclipse.jetty.util.log.JavaUtilLog

Minimum JVM Heap Size is 4096 MB and Maximum JVM Heap Size is 6144 MB.

My server has 2 vCPU and 8 GB RAM.

Yesterday, my Coldfusion server crashed suddenly so I ask you if there is some problem in my actual configuration.

Thank you all.

This topic has been closed for replies.
Correct answer carl type3

Hi,

The JVM parameters appear correct. You have modified the install default settings for Minimum JVM Heap Size is 4096 MB and Maximum JVM Heap Size.

Perhaps you would like to consider this value: -XX:MaxMetaspaceSize=192m

On 64 bit it is fair to say small. With available memory you could increase that to 512m. It can be a good

idea to configure an initial setting as well as maximum EG:

-XX:MetaspaceSize=312m -XX:MaxMetaspaceSize=512m

CF requires a restart to apply that change.

It is good to be aware there are other memory spaces that are present by default in Java 8 64 bit even tho not mentioned in the JVM settings. EG:

-XX:ReservedCodeCacheSize=240m

-XX:CompressedClassSpaceSize=1g

HTH, Carl.

2 replies

X
xfreeman89xAuthor
Inspiring
February 9, 2016

Thank you Carl for your solution. I will increase -XX:MaxMetaspaceSize to 512MB as you suggested. I have one more question: if I set other values such as -XX:MetaspaceSize or -XX:ReservedCodeCacheSize have I increase physical memory or those values are tailored inside JVM heap size?

Thanks a lot.

Salvatore

Salvatore Cerruto
C
carl type3
Legend
February 9, 2016

Hi Salvatore,

The values for XX:MetaspaceSize or XX:ReservedCodeCacheSize are non heap. That memory will be consumed outside of heap which you have set to initial 4G maximum 6G.

With regard to heap it can sometimes be a good idea to set initial and maximum the same. Some kind of Java monitoring would be needed to know for sure what is best. Let me be clear I am guessing, on a server with 8Gb RAM perhaps initial 4G maximum 4G is better to leave RAM available for non heap.

HTH again, Carl.

    C
    carl type3Correct answer
    Legend
    February 9, 2016

    Hi,

    The JVM parameters appear correct. You have modified the install default settings for Minimum JVM Heap Size is 4096 MB and Maximum JVM Heap Size.

    Perhaps you would like to consider this value: -XX:MaxMetaspaceSize=192m

    On 64 bit it is fair to say small. With available memory you could increase that to 512m. It can be a good

    idea to configure an initial setting as well as maximum EG:

    -XX:MetaspaceSize=312m -XX:MaxMetaspaceSize=512m

    CF requires a restart to apply that change.

    It is good to be aware there are other memory spaces that are present by default in Java 8 64 bit even tho not mentioned in the JVM settings. EG:

    -XX:ReservedCodeCacheSize=240m

    -XX:CompressedClassSpaceSize=1g

    HTH, Carl.

      Terms & ConditionsAccessibility statement
      Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices