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POcelery + eventlet = 100% CPU usage
 

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  1. POcelery + eventlet = 100% CPU usage
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    <p>We are using celery to get flights data from different travel agencies, every request takes ~20-30 seconds(most agencies require request sequence - authorize, send request, poll for results). </p> <p>Normal celery task looks like this: </p> <pre><code>from eventlet.green import urllib2, time def get_results(attr, **kwargs): search, provider, minprice = attr data = XXX # prepared data host = urljoin(MAIN_URL, "RPCService/Flights_SearchStart") req = urllib2.Request(host, data, {'Content-Type': 'text/xml'}) try: response_stream = urllib2.urlopen(req) except urllib2.URLError as e: return [search, None] response = response_stream.read() rsp_host = urljoin(MAIN_URL, "RPCService/FlightSearchResults_Get") rsp_req = urllib2.Request(rsp_host, response, {'Content-Type': 'text/xml'}) ready = False sleeptime = 1 rsp_response = '' while not ready: time.sleep(sleeptime) try: rsp_response_stream = urllib2.urlopen(rsp_req) except urllib2.URLError as e: log.error('go2see: results fetch failed for %s IOError %s'% (search.id, str(e))) else: rsp_response = rsp_response_stream.read() try: rsp = parseString(rsp_response) except ExpatError as e: return [search, None] else: ready = rsp.getElementsByTagName('SearchResultEx') [0].getElementsByTagName('IsReady')[0].firstChild.data ready = (ready == 'true') sleeptime += 1 if sleeptime &gt; 10: return [search, None] hash = "%032x" % random.getrandbits(128) open(RESULT_TMP_FOLDER+hash, 'w+').write(rsp_response) # call to parser parse_agent_results.apply_async(queue='parsers', args=[__name__, search, provider, hash]) </code></pre> <p>This tasks are run in eventlet pool with concurency 300, <code>prefetch_multiplier = 1</code>, <code>broker_limit = 300</code> When ~100-200 task are fetched from queue - CPU usage raises up to 100% ( whole CPU core is used) and task fetching from queue is performed with delays. </p> <p>Could you please point on possible issues - blocking operations( eventlet <code>ALARM DETECTOR</code> gives no exceptions ), wrong architecture or whatever.</p>
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      1. POcelery + eventlet = 100% CPU usage
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    1. COI have been investigating reports about high CPU usage that only happens after upgrading to 2.5.x. I have not yet been able to reproduce, as I haven't received any example doing so. But maybe this will do the job, I will try and report back. Thanks!
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