<div dir="ltr">Behazd, <div><br></div><div>Ok, for now we can do it in such way. </div><div><br></div><div>What I am thinking is that this *logic* should be implemented on benchmark.runner level. </div><div>Cause different load generators are using different approaches to generate load. </div><div>So in case of "serial" runner it's even impossible to make locking.</div><div><br></div><div>So what about adding in <a href="https://github.com/stackforge/rally/blob/master/rally/benchmark/runners/base.py#L140">https://github.com/stackforge/rally/blob/master/rally/benchmark/runners/base.py#L140</a></div><div>2 abstract methods (one for incrementing, another for waiting) </div><div><br></div><div>And implement them for different runners? </div><div><br></div><div><br></div><div>Best regards, </div><div>Boris Pavlovic </div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 23, 2014 at 12:05 PM, Behzad Dastur (bdastur) <span dir="ltr"><<a href="mailto:bdastur@cisco.com" target="_blank">bdastur@cisco.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Boris,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I am still getting my feet wet with rally so some concepts are new, and did not quite get your statement regarding the different load generators. I am presuming
you are referring to the Scenario runner and the different “types” of runs.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">What I was looking at is the runner, where we specify the type, times and concurrency. We could have an additional field(s) which would specify the synchronization
property.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Essentially, what I have found most useful in the cases where we run scenarios/tests in parallel; is some sort of “barrier”, where at a certain point in the
run you want all the parallel tasks to reach a specific point before continuing.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Also, I am also considering cases where synchronization is needed within a single benchmark case, where the same benchmark scenario:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">creates some vms, performs some tasks, deletes the vm<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Just for simplicity as a POC, I tried something with shared memory (multiprocessing.Value), which looks something like this:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">class Barrier(object):<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> __init__(self, concurrency)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> self.shmem = multiprocessing.Value(‘I’, concurrency)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> self.lock = multiprocessing.Lock()<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> def wait_at_barrier ():<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> while self.shmem.value > 0:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> time.sleep(1)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> return<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> def decrement_shm_concurrency_cnt ():<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> with self.lock:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> self.shmem.value -= 1<br>
<br>
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">And from the scenario, it can be called as:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">scenario:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> -- do some action –<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> barrobj.decrement_shm_concurrency_cnt()<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> sync_helper.wait_at_barrier()
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-- do some action –
</span><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">ß</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> all processes will do this action at almost the same time.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I would be happy to discuss more to get a good common solution.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Behzad<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:boris@pavlovic.ru" target="_blank">boris@pavlovic.ru</a> [mailto:<a href="mailto:boris@pavlovic.ru" target="_blank">boris@pavlovic.ru</a>]
<b>On Behalf Of </b>Boris Pavlovic<br>
<b>Sent:</b> Tuesday, October 21, 2014 3:23 PM<br>
<b>To:</b> Behzad Dastur (bdastur)<br>
<b>Cc:</b> OpenStack Development Mailing List (not for usage questions); Pradeep Chandrasekar (pradeech); John Wei-I Wu (weiwu)<br>
<b>Subject:</b> Re: [openstack-dev] [rally][users]: Synchronizing between multiple scenario instances.<u></u><u></u></span></p><div><div class="h5">
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<p class="MsoNormal">Behzad, <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Unfortunately at this point there is no support of locking between scenarios.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">It will be quite tricky for implementation, because we have different load generators, and we will need to find <u></u><u></u></p>
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<p class="MsoNormal">common solutions for all of them. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">If you have any ideas about how to implement it in such way, I will be more than happy to get this in upstream. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">One of the way that I see is to having some kind of chain-of-benchmarks:<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">1) Like first benchmark is running N VMs<u></u><u></u></p>
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<p class="MsoNormal">2) Second benchmarking is doing something with all those benchmarks<u></u><u></u></p>
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<p class="MsoNormal">3) Third benchmark is deleting all these VMs <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">(where chain elements are atomic actions)<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Probably this will be better long term solution. <u></u><u></u></p>
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<p class="MsoNormal">Only thing that we should understand is how to store those results and how to display them. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">If you would like to help with this let's start discussing it, in some kind of google docs. <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thoughts?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Best regards,<u></u><u></u></p>
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<p class="MsoNormal">Boris Pavlovic <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Wed, Oct 22, 2014 at 2:13 AM, Behzad Dastur (bdastur) <<a href="mailto:bdastur@cisco.com" target="_blank">bdastur@cisco.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Does rally provide any synchronization mechanism to synchronize between multiple scenario, when running
in parallel? Rally spawns multiple processes, with each process running the scenario. We need a way to synchronize between these to start a perf test operation at the same time.
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">regards,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Behzad</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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