public String getEnvStringForTesting() {
        return environmentVariables.entrySet().stream().sorted(Map.Entry.comparingByKey())
                .map(e -> e.getKey() + '=' + toEnvValue(e.getValue())).collect(Collectors.joining(" "));
    }
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