This section describes how to create, update, remove, and view pico configurations.

Each pico configuration consists of a set of attributes, including templates, system properties, JVM arguments, and classpaths. When you change these attributes in a configuration, the corresponding pico instance must be restarted.

A configuration may also include "settings" attributes. Unlike e g properties, this type of attribute may contain array values and changes do not require restart of pico instances.

{
	template=<template name space>.<template file name>
	settings {
		state=enabled
	    tags=[]
	}
 	config {
  		classpath {
			#classpaths...
  		}
  		jvmargs {
			#jvmargs...
		}
		properties {
			#properties... {
			pico
				#picos.. {
				groups {
					#groups...
				}
			}
		}
 	}
}

Settings

At the time of writing, there are three available settings:

• state - If set to disabled, this pico will not be started by the system command    
• tags - Add tags to group pico instances in the mzsh command system.

• pico.groups - This attribute is applicable for ECs. Add pico groups to reference multiple pico instances as an entity in a workflow. You can only reference existing EC groups in the pico.groups attribute. For information about how to create an EC group, see /wiki/spaces/MD82/pages/3770753 in the /wiki/spaces/MD82/pages/3768690.

Classpaths

The default classpath attributes that are set in the pico configuration of the Platform. Agents that are installed on the system may require that additional classpaths are set in the pico configuration of ECs. 

JVM Arguments

A number of JVM arguments controlling the memory usage are set in the default template standard, which is inherited by all other default templates.

config {
...
    jvmargs {
        args=[
            "-server"
        ]
        maxDirect=[
            "-XX:MaxDirectMemorySize=4096M"
        ]
        maxMetaspace=[
            "-XX:MaxMetaspaceSize=196M"
        ]
        xms=[
            "-Xms64M"
        ]
        xmx=[
            "-Xmx256M"
        ]
    }
...    
}

 You can add additional JVM arguments in a custom template or override the default values in your pico configurations.

maxDirect

MaxDirectMemorySize

maxMetaspace

maxMetaspace

xms

Xms

mzsh topo set topo://container:<container>/pico:<pico>/obj:config.jvmargs \
'<label>: ["argument1","argument2"]'

mzsh topo set topo://container:main1/pico:platform/obj:config.jvmargs \
'xmx:["-Xmx256M"]
xms:["-Xms64M"]
maxMetaspace:["-XX:MaxMetaspaceSize=196M"]
maxDirect:["-XX:MaxDirectMemorySize=4096M"]
args : ["-server"]'

If you have a large block of APL code, e g 300 lines or more, add the JVM argument -XX:DontCompileHugeMethods to pico configurations of ECs. This causes the the JIT compilation to take effect:

mzsh topo set topo://container:<container>/pico:<pico>/obj:config.jvmargs \
'dontCompileHugeMethods:["-XX:DontCompileHugeMethods"]'

System Properties

For information about the available system properties, see System Properties.