We ultimately decided to rollout despite this glitch.  Not happy about it,
and hoping whatever is causing this gets resolved in a future release.  My
hunch is that it's a fixed price being paid that if 1000's of more
requests/second were sent to the app would make this unnoticeable.



On Sun, Oct 7, 2018 at 11:18 AM Avshalom Manevich <avshalom...@gmail.com>
wrote:

> Hi Gary,
>
> Did you end up finding a solution to this?
>
> We're hitting a similar issue with Akka HTTP (10.0.11) and a low-load
> server.
>
> Average latency is great but 99th percentile is horrible (~200ms).
>
> Appreciate your input.
>
> Regards,
> Avshalom
>
>
> I wonder if you could start a timer when you enter the trace block and
>> then e.g. after 200ms trigger one or multiple stack dumps (using JMX or
>> just by printing out the result of `Thread.getAllStackTraces`). It's not
>> super likely that something will turn up but it seems like a simple enough
>> thing to try.
>>
>> Johannes
>>
>> On Thursday, November 16, 2017 at 1:28:23 PM UTC+1, Gary Malouf wrote:
>>
>>> Hi Johannes,
>>>
>>> Yes; we are seeing 2-3 requests/second (only in production) with the
>>> latency spikes.  We found no correlation between the gc times and these
>>> request latencies, nor between the size/type of requests.
>>>
>>> We had to pause the migration effort for 2 weeks because of the time
>>> being taken, but just jumped back on it the other day.
>>>
>>> Our current strategy is to implement this with the low level api to see
>>> if we get the same results.
>>>
>>> Gary
>>>
>>> On Nov 16, 2017 6:57 AM, <johannes...@lightbend.com> wrote:
>>>
>>> Hi Gary,
>>>
>>> did you find out what's going on by now? If I understand correctly, you
>>> get latency spikes as soon as you use the `entity[as[String]]` directive?
>>> Could you narrow down if there's anything special to those requests? I
>>> guess you monitor your GC times?
>>>
>>> Johannes
>>>
>>>
>>> On Wednesday, November 1, 2017 at 8:56:50 PM UTC+1, Gary Malouf wrote:
>>>
>>>> So the only way I was able to successfully identify the suspicious code
>>>> was to route a percentage of my production traffic to a stubbed route that
>>>> I incrementally added back pieces of our implementation into.  What I found
>>>> was that we started getting spikes when the entity(as[CaseClassFromJson
>>>> ]) stubbed was added back in.  To figure out if it was the json
>>>> parsing or 'POST' entity consumption itself, I replaced that class with a
>>>> string - turns out we experience the latency spikes with that as well (on
>>>> low traffic as noted earlier in this thread).
>>>>
>>>> I by no means have a deep understanding of streams, but it makes me
>>>> wonder if the way I have our code consuming the entity is not correct.
>>>>
>>>> On Monday, October 30, 2017 at 4:27:13 PM UTC-4, Gary Malouf wrote:
>>>>
>>>>> Hi Roland - thank you for the tip.  We shrunk the thread pool size
>>>>> down to 1, but were disheartened to still see the latency spikes.  Using
>>>>> Kamon's tracing library (which we validated with various tests to ensure
>>>>> it's own numbers are most likely correct), we could not find anything in
>>>>> our code within the route that was causing the latency (it all appeared to
>>>>> be classified to be that route but no code segments within it).
>>>>>
>>>>> As mentioned earlier, running loads of 100-1000 requests/second
>>>>> completely hides the issue (save for the max latency) as everything 
>>>>> through
>>>>> 99th percentiles is under a few milliseconds.
>>>>>
>>>>> On Tuesday, October 24, 2017 at 2:23:07 AM UTC-4, rkuhn wrote:
>>>>>
>>>>>> 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 <malou...@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...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> And you consume the entityBytes I presume?
>>>>>>>
>>>>>>> On Mon, Oct 23, 2017 at 10:35 PM, Gary Malouf <malou...@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...@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 <malou...@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...@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 <
>>>>>>>>>>> malou...@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 <http://kto.so>' Malawski
>>>>>>>>>>>>> Akka <http://akka.io/> @ Lightbend <http://lightbend.com/>
>>>>>>>>>>>>>
>>>>>>>>>>>>> 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:
>>>>>>>>>>>>> https://groups.google.com/group/akka-user
>>>>>>>>>>>>> ---
>>>>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from
>>>>>>>>>>>>> it, send an email to akka-user+...@googlegroups.com.
>>>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>>>> ---
>>>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from
>>>>>>>>>>>> it, send an email to akka-user+...@googlegroups.com.
>>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> Cheers,
>>>>>>>>>>> √
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>>> ---
>>>>>>>>>>> You received this message because you are subscribed to a topic
>>>>>>>>>>> in the Google Groups "Akka User List" group.
>>>>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe
>>>>>>>>>>> .
>>>>>>>>>>> To unsubscribe from this group and all its topics, send an email
>>>>>>>>>>> to akka-user+...@googlegroups.com.
>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>> ---
>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Cheers,
>>>>>>>>> √
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>> ---
>>>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>>>> the Google Groups "Akka User List" group.
>>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe
>>>>>>>>> .
>>>>>>>>> To unsubscribe from this group and all its topics, send an email
>>>>>>>>> to akka-user+...@googlegroups.com.
>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> >>>>>>>>>> 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
>>>>>>>> ---
>>>>>>>> You received this message because you are subscribed to the Google
>>>>>>>> Groups "Akka User List" group.
>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Cheers,
>>>>>>> √
>>>>>>>
>>>>>>> --
>>>>>>> >>>>>>>>>> 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
>>>>>>> ---
>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>> the Google Groups "Akka User List" group.
>>>>>>> To unsubscribe from this topic, visit
>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe.
>>>>>>> To unsubscribe from this group and all its topics, send an email to
>>>>>>> akka-user+...@googlegroups.com.
>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>
>>>>>>
>>>>>> --
>>>>>> >>>>>>>>>> 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
>>>>>> ---
>>>>>> You received this message because you are subscribed to the Google
>>>>>> Groups "Akka User List" group.
>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>> --
>>> >>>>>>>>>> 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
>>> ---
>>> You received this message because you are subscribed to a topic in the
>>> Google Groups "Akka User List" group.
>>> To unsubscribe from this topic, visit
>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe.
>>> To unsubscribe from this group and all its topics, send an email to
>>> akka-user+...@googlegroups.com.
>>> To post to this group, send email to akka...@googlegroups.com.
>>> Visit this group at https://groups.google.com/group/akka-user.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>>>
>>>
> בתאריך יום חמישי, 16 בנובמבר 2017 בשעה 15:00:35 UTC+2, מאת
> johannes...@lightbend.com:
>
>> I wonder if you could start a timer when you enter the trace block and
>> then e.g. after 200ms trigger one or multiple stack dumps (using JMX or
>> just by printing out the result of `Thread.getAllStackTraces`). It's not
>> super likely that something will turn up but it seems like a simple enough
>> thing to try.
>>
>> Johannes
>>
>> On Thursday, November 16, 2017 at 1:28:23 PM UTC+1, Gary Malouf wrote:
>>
>>> Hi Johannes,
>>>
>>> Yes; we are seeing 2-3 requests/second (only in production) with the
>>> latency spikes.  We found no correlation between the gc times and these
>>> request latencies, nor between the size/type of requests.
>>>
>>> We had to pause the migration effort for 2 weeks because of the time
>>> being taken, but just jumped back on it the other day.
>>>
>>> Our current strategy is to implement this with the low level api to see
>>> if we get the same results.
>>>
>>> Gary
>>>
>>> On Nov 16, 2017 6:57 AM, <johannes...@lightbend.com> wrote:
>>>
>>> Hi Gary,
>>>
>>> did you find out what's going on by now? If I understand correctly, you
>>> get latency spikes as soon as you use the `entity[as[String]]` directive?
>>> Could you narrow down if there's anything special to those requests? I
>>> guess you monitor your GC times?
>>>
>>> Johannes
>>>
>>>
>>> On Wednesday, November 1, 2017 at 8:56:50 PM UTC+1, Gary Malouf wrote:
>>>
>>>> So the only way I was able to successfully identify the suspicious code
>>>> was to route a percentage of my production traffic to a stubbed route that
>>>> I incrementally added back pieces of our implementation into.  What I found
>>>> was that we started getting spikes when the entity(as[CaseClassFromJson
>>>> ]) stubbed was added back in.  To figure out if it was the json
>>>> parsing or 'POST' entity consumption itself, I replaced that class with a
>>>> string - turns out we experience the latency spikes with that as well (on
>>>> low traffic as noted earlier in this thread).
>>>>
>>>> I by no means have a deep understanding of streams, but it makes me
>>>> wonder if the way I have our code consuming the entity is not correct.
>>>>
>>>> On Monday, October 30, 2017 at 4:27:13 PM UTC-4, Gary Malouf wrote:
>>>>
>>>>> Hi Roland - thank you for the tip.  We shrunk the thread pool size
>>>>> down to 1, but were disheartened to still see the latency spikes.  Using
>>>>> Kamon's tracing library (which we validated with various tests to ensure
>>>>> it's own numbers are most likely correct), we could not find anything in
>>>>> our code within the route that was causing the latency (it all appeared to
>>>>> be classified to be that route but no code segments within it).
>>>>>
>>>>> As mentioned earlier, running loads of 100-1000 requests/second
>>>>> completely hides the issue (save for the max latency) as everything 
>>>>> through
>>>>> 99th percentiles is under a few milliseconds.
>>>>>
>>>>> On Tuesday, October 24, 2017 at 2:23:07 AM UTC-4, rkuhn wrote:
>>>>>
>>>>>> 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 <malou...@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...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> And you consume the entityBytes I presume?
>>>>>>>
>>>>>>> On Mon, Oct 23, 2017 at 10:35 PM, Gary Malouf <malou...@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...@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 <malou...@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...@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 <
>>>>>>>>>>> malou...@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 <http://kto.so>' Malawski
>>>>>>>>>>>>> Akka <http://akka.io/> @ Lightbend <http://lightbend.com/>
>>>>>>>>>>>>>
>>>>>>>>>>>>> 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:
>>>>>>>>>>>>> https://groups.google.com/group/akka-user
>>>>>>>>>>>>> ---
>>>>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from
>>>>>>>>>>>>> it, send an email to akka-user+...@googlegroups.com.
>>>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>>>> ---
>>>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from
>>>>>>>>>>>> it, send an email to akka-user+...@googlegroups.com.
>>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> Cheers,
>>>>>>>>>>> √
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>>> ---
>>>>>>>>>>> You received this message because you are subscribed to a topic
>>>>>>>>>>> in the Google Groups "Akka User List" group.
>>>>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe
>>>>>>>>>>> .
>>>>>>>>>>> To unsubscribe from this group and all its topics, send an email
>>>>>>>>>>> to akka-user+...@googlegroups.com.
>>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>>> ---
>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>> Google Groups "Akka User List" group.
>>>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Cheers,
>>>>>>>>> √
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> >>>>>>>>>> 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
>>>>>>>>> ---
>>>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>>>> the Google Groups "Akka User List" group.
>>>>>>>>> To unsubscribe from this topic, visit
>>>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe
>>>>>>>>> .
>>>>>>>>> To unsubscribe from this group and all its topics, send an email
>>>>>>>>> to akka-user+...@googlegroups.com.
>>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> >>>>>>>>>> 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
>>>>>>>> ---
>>>>>>>> You received this message because you are subscribed to the Google
>>>>>>>> Groups "Akka User List" group.
>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Cheers,
>>>>>>> √
>>>>>>>
>>>>>>> --
>>>>>>> >>>>>>>>>> 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
>>>>>>> ---
>>>>>>> You received this message because you are subscribed to a topic in
>>>>>>> the Google Groups "Akka User List" group.
>>>>>>> To unsubscribe from this topic, visit
>>>>>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe.
>>>>>>> To unsubscribe from this group and all its topics, send an email to
>>>>>>> akka-user+...@googlegroups.com.
>>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>
>>>>>>
>>>>>> --
>>>>>> >>>>>>>>>> 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
>>>>>> ---
>>>>>> You received this message because you are subscribed to the Google
>>>>>> Groups "Akka User List" group.
>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>> send an email to akka-user+...@googlegroups.com.
>>>>>> To post to this group, send email to akka...@googlegroups.com.
>>>>>> Visit this group at https://groups.google.com/group/akka-user.
>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>> --
>>> >>>>>>>>>> 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
>>> ---
>>> You received this message because you are subscribed to a topic in the
>>> Google Groups "Akka User List" group.
>>> To unsubscribe from this topic, visit
>>> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe.
>>> To unsubscribe from this group and all its topics, send an email to
>>> akka-user+...@googlegroups.com.
>>> To post to this group, send email to akka...@googlegroups.com.
>>> Visit this group at https://groups.google.com/group/akka-user.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>>>
>>> --
>
> *****************************************************************************************************
> ** New discussion forum: https://discuss.akka.io/ replacing akka-user
> google-group soon.
> ** This group will soon be put into read-only mode, and replaced by
> discuss.akka.io
> ** More details:
> https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced
>
> *****************************************************************************************************
> >>>>>>>>>>
> >>>>>>>>>> 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
> ---
> You received this message because you are subscribed to a topic in the
> Google Groups "Akka User List" group.
> To unsubscribe from this topic, visit
> https://groups.google.com/d/topic/akka-user/-_C9jCPDwts/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> akka-user+unsubscr...@googlegroups.com.
> To post to this group, send email to akka-user@googlegroups.com.
> Visit this group at https://groups.google.com/group/akka-user.
> For more options, visit https://groups.google.com/d/optout.
>

-- 
*****************************************************************************************************
** New discussion forum: https://discuss.akka.io/ replacing akka-user 
google-group soon.
** This group will soon be put into read-only mode, and replaced by 
discuss.akka.io
** More details: https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced
*****************************************************************************************************
>>>>>>>>>> 
>>>>>>>>>>      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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