Question: GATK -Xmx4G and -Xmx8G
gravatar for alhamidi.reem
12 months ago by
alhamidi.reem20 wrote:

Dear all,

I would like to know what the difference is between the "-Xmx4G" and "-Xmx8G" switches on GATK. All I know is, both of these switches are used for specifying memory allocation (which I'm still not quite sure I understand the meaning of it) from

I want to use the HaplotypeCaller tool on my bam files, and I'd like to know the difference between switches before I proceed.

Many thanks


ADD COMMENTlink modified 12 months ago by andrew.j.skelton736.0k • written 12 months ago by alhamidi.reem20
gravatar for andrew.j.skelton73
12 months ago by
andrew.j.skelton736.0k wrote:

These aren't GATK specific switches, but a java JVM (java virtual machine) parameter. Since GATK4, these parameters have been absorbed into the main binary to integrate well with the WDL notation and Cromwell orchestration.

-Xmx is the switch to tell Java how much memory it's allowed to work with (heap size). This is akin to the amount of RAM on your machine. -Xmx8G means that you're telling Java it can work with 8GB of memory (or RAM) on your machine. It's important not to allocate more than your machine has available.

ADD COMMENTlink written 12 months ago by andrew.j.skelton736.0k

Thanks alot, Andrew.

ADD REPLYlink written 12 months ago by alhamidi.reem20
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