Is 128Mb enough as a PHP allocation?

Hello everyone,

I'm receiving the following error in my logs:

[01-Mar-2016 06:21:03 America/Denver] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 12730211 bytes) in /googleads-php-lib-6.1.0/src/Google/Api/Ads/Common/Util/XmlUtils.php on line 61
Here is the function in question:

  public static function GetXmlFromDom($document) {
    return trim($document->saveXml()); // Line 61
  }

My hosting has 128Mb available to allocate to PHP Scripts, no more.

So my question is, is the API Simply running out of memory whilst trying to process data, or is there other issues at play?

Many thanks

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