node() {
    stage('1') {
         500.times {
                sh """#!/bin/sh +e
                    echo ${it}
                """
            }
    }    
}

There will be errors when 60 concurrent executions are performed simultaneously.
sh: /opt/container/instances/tomcat/app.data/workspace/ddd@53@tmp/durable-4c0dc187/script.sh: /bin/sh: bad interpreter: Text file busy