You could try to decrease your thread pool size to 1 to exclude wakeup 
latencies when things (like CPU cores) have gone to sleep.

Regards, Roland 

Sent from my iPhone

> On 23. Oct 2017, at 22:49, Gary Malouf <malouf.g...@gmail.com> wrote:
> 
> Yes, it gets parsed using entity(as[]) with spray-json support.  Under a load 
> test of say 1000 requests/second these latencies are not visible in the 
> percentiles - they are easy to see because this web server is getting 10-20 
> requests/second currently.  Trying to brainstorm if a dispatcher needed to be 
> tuned or something of that sort but have yet to see evidence supporting that.
> 
> path("foos") {
> traceName("FooSelection") {
> 
> entity(as[ExternalPageRequest]) { pr =>
> val spr = toSelectionPageRequest(pr)
> shouldTracePageId(spr.pageId).fold(
> Tracer.currentContext.withNewSegment(s"Page-${pr.pageId}", "PageTrace", 
> "kamon") {
> processPageRequestAndComplete(pr, spr)
> },
> processPageRequestAndComplete(pr, spr)
> )
> }
> }
> 
> }
> 
>> On Mon, Oct 23, 2017 at 4:42 PM, Viktor Klang <viktor.kl...@gmail.com> wrote:
>> And you consume the entityBytes I presume?
>> 
>>> On Mon, Oct 23, 2017 at 10:35 PM, Gary Malouf <malouf.g...@gmail.com> wrote:
>>> It is from when I start the Kamon trace (just inside of my 
>>> path("myawesomepath") declaration until (theoretically) a 'complete' call 
>>> is made.  
>>> 
>>> path("myawesomepath") {
>>>   traceName("CoolStory") {
>>> ///do some stuff
>>>  complete("This is great")
>>> } }
>>> 
>>> For what it's worth, this route is a 'POST' call.
>>> 
>>>> On Mon, Oct 23, 2017 at 4:30 PM, Viktor Klang <viktor.kl...@gmail.com> 
>>>> wrote:
>>>> No, I mean, is it from first-byte-received to last-byte-sent or what?
>>>> 
>>>>> On Mon, Oct 23, 2017 at 10:22 PM, Gary Malouf <malouf.g...@gmail.com> 
>>>>> wrote:
>>>>> We are using percentiles computed via Kamon 0.6.8.  In a very low request 
>>>>> rate environment like this, it takes roughly 1 super slow request/second 
>>>>> to throw off the percentiles (which is what I think is happening).  
>>>>> 
>>>>> 
>>>>> 
>>>>>> On Mon, Oct 23, 2017 at 4:20 PM, Viktor Klang <viktor.kl...@gmail.com> 
>>>>>> wrote:
>>>>>> What definition of latency are you using? (i.e. how is it derived)
>>>>>> 
>>>>>>> On Mon, Oct 23, 2017 at 10:11 PM, Gary Malouf <malouf.g...@gmail.com> 
>>>>>>> wrote:
>>>>>>> Hi Konrad,
>>>>>>> 
>>>>>>> Our real issue is that we can not reproduce the results.  The web 
>>>>>>> server we are having latency issues with is under peak load of 10-15 
>>>>>>> requests/second - obviously not much to deal with.  
>>>>>>> 
>>>>>>> When we use load tests (https://github.com/apigee/apib), it's easy for 
>>>>>>> us to throw a few thousand requests/second at it and get latencies in 
>>>>>>> the ~ 3 ms range.  We use kamon to track internal metrics - what we see 
>>>>>>> is that our 95th and 99th percentiles only look bad under the 
>>>>>>> production traffic but not under load tests.  
>>>>>>> 
>>>>>>> I've since used kamon to print out the actual requests trying to find 
>>>>>>> any pattern in them to hint at what's wrong in my own code, but they 
>>>>>>> seem to be completely random.  What we do know is that downgrading to 
>>>>>>> spray gets us 99.9th percentile latencies under 2ms, so something 
>>>>>>> related to the upgrade is allowing this.
>>>>>>> 
>>>>>>> Thanks,
>>>>>>> 
>>>>>>> Gary
>>>>>>> 
>>>>>>>> On Tuesday, October 17, 2017 at 12:07:51 PM UTC-4, Konrad Malawski 
>>>>>>>> wrote:
>>>>>>>> Step 1 – don’t panic ;-)
>>>>>>>> Step 2 – as I already asked for, please share actual details of the 
>>>>>>>> benchmarks. It is not good to discuss benchmarks without any insight 
>>>>>>>> into what / how exactly you’re measuring.
>>>>>>>> 
>>>>>>>> -- 
>>>>>>>> Cheers,
>>>>>>>> Konrad 'ktoso' Malawski
>>>>>>>> Akka @ Lightbend
>>>>>>>> 
>>>>>>>>> On October 12, 2017 at 15:31:19, Gary Malouf (malou...@gmail.com) 
>>>>>>>>> wrote:
>>>>>>>>> 
>>>>>>>>> We have a web service that we just finished migrating from spray 1.3 
>>>>>>>>> to Akka-Http 10.0.9.  While in most cases it is performing well, we 
>>>>>>>>> are seeing terrible 99th percentile latencies 300-450ms range) 
>>>>>>>>> starting from a very low request rate (10/second) on an ec2 m3.large. 
>>>>>>>>>  
>>>>>>>>> 
>>>>>>>>> Our service does not do anything complicated - it does a few Map 
>>>>>>>>> lookups and returns a response to a request.  In spray, even 99th 
>>>>>>>>> percentile latencies were on the order of 1-3 ms, so we are 
>>>>>>>>> definitely concerned.  Connections as with many pixel-type servers 
>>>>>>>>> are short-lived -> we actually pass the Connection: Close header 
>>>>>>>>> intentionally in our responses.  
>>>>>>>>> 
>>>>>>>>> Is there any obvious tuning that should be done on the server 
>>>>>>>>> configuration that others have found?
>>>>>>>>> --
>>>>>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>> >>>>>>>>>> Check the FAQ: 
>>>>>>>>> >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>> >>>>>>>>>> Search the archives: 
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>>>>>>> -- 
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>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> -- 
>>>>>> Cheers,
>>>>>> √
>>>>>> -- 
>>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>> >>>>>>>>>> Check the FAQ: 
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>>>>> 
>>>>> -- 
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>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> Cheers,
>>>> √
>>>> -- 
>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>> >>>>>>>>>> Check the FAQ: 
>>>> >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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>>> 
>>> -- 
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>> 
>> 
>> 
>> -- 
>> Cheers,
>> √
>> -- 
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
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> 
> -- 
> >>>>>>>>>> Read the docs: http://akka.io/docs/
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-- 
>>>>>>>>>>      Read the docs: http://akka.io/docs/
>>>>>>>>>>      Check the FAQ: 
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>>      Search the archives: https://groups.google.com/group/akka-user
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