multi-load.xml

<?xml version="1.0" encoding="UTF-8"?>
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                <timestamp>true</timestamp>
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                <label>true</label>
                <code>true</code>
                <message>true</message>
                <threadName>true</threadName>
                <dataType>true</dataType>
                <encoding>false</encoding>
                <assertions>true</assertions>
                <subresults>true</subresults>
                <responseData>false</responseData>
                <samplerData>false</samplerData>
                <xml>true</xml>
                <fieldNames>false</fieldNames>
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                <requestHeaders>false</requestHeaders>
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        <stringProp name="ThreadGroup.delay"></stringProp>
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            <collectionProp name="Arguments.arguments"/>
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          <stringProp name="HTTPSampler.port">8080</stringProp>
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          <stringProp name="HTTPSampler.response_timeout"></stringProp>
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                <label>true</label>
                <code>true</code>
                <message>true</message>
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                <dataType>true</dataType>
                <encoding>false</encoding>
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                <subresults>true</subresults>
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        <stringProp name="ThreadGroup.duration"></stringProp>
        <stringProp name="ThreadGroup.delay"></stringProp>
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            <collectionProp name="Arguments.arguments"/>
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                <latency>true</latency>
                <timestamp>true</timestamp>
                <success>true</success>
                <label>true</label>
                <code>true</code>
                <message>true</message>
                <threadName>true</threadName>
                <dataType>true</dataType>
                <encoding>false</encoding>
                <assertions>true</assertions>
                <subresults>true</subresults>
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                <responseHeaders>false</responseHeaders>
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</jmeterTestPlan>

multi.py

from eventlet import listen, sleep, wsgi
from multiprocessing import Process, Semaphore


LIMIT = 30


class Application(object):
    def __init__(self, semaphore):
        self.semaphore = semaphore

    def _lock(self):
        # A hot-ish sleeping loop, but we can't allow the multiprocessing
        # semaphore to block. sleep(0) may work here, too.
        while not self.semaphore.acquire(block=False):
            sleep(0)

        return True

    def _unlock(self):
        self.semaphore.release()

    def get(self):
        return ["GET Response"]

    def delete(self):
        # Acquire our semaphore.
        self._lock()

        # Do some "work"
        sleep(1)

        # Release our semaphore.
        self._unlock()

        return ["DELETE Response"]

    def __call__(self, env, start_response):
        method = env['REQUEST_METHOD']

        handlers = {}
        handlers['GET'] = self.get
        handlers['DELETE'] = self.delete

        start_response('200 OK', [('Content-Type', 'text/plain')])
        return handlers[method]()


def worker(port, semaphore):
    wsgi.server(listen(('', port)), Application(semaphore))


if __name__ == '__main__':
    semaphore = Semaphore(LIMIT)
    workers = []

    for port in range(8080, 8083):
        process = Process(target=worker, args=(port, semaphore))
        process.start()

        workers.append(process)

    for w in workers:
        w.join()