public void addEnvironmentVariable(String nameAndValue) {
        int pos = nameAndValue.indexOf('=');
        environmentVariables.put(nameAndValue.substring(0, pos), nameAndValue.substring(pos+1));
    }
If larger or equal to 0 it mean that explicit mmaps shall not be included in coredump.
config-model/src/main/java/com/yahoo/vespa/model/AbstractService.java