Hello, Dave!
воскресенье, 19 марта 2017 г., 3:28:13 UTC+3 пользователь David
Collier-Brown написал:
>
> Are you seeing the average response time / latency of the cache from
> outside?
>
I don't calculate average, I'm using percentiles! Looks like the "cache"
don't affect at all, otherwise I'll seen that on my graphs, since I'm
calling my cache inside http handler between timings.
> If so, you should see lots of really quick responeses, and a few ones as
> slow as inside that average to what you're seeing.
>
No, as I said, I'm using only percentiles, not average.
>
> --dave
>
>
> On Saturday, March 18, 2017 at 3:52:21 PM UTC-4, Alexander Petrovsky wrote:
>>
>> Hello!
>>
>> Colleagues, I need your help!
>>
>> And so, I have the application, that accept through http (fasthttp)
>> dynamic json, unmarshal it to the map[string]interface{} using ffjson,
>> after that some fields reads into struct, then using this struct I make
>> some calculations, and then struct fields writes into
>> map[string]interface{}, this map writes to kafka (asynchronous), and
>> finally the result reply to client through http. Also, I have 2 caches, one
>> contains 100 millions and second 20 millions items, this caches build using
>> freecache to avoid slooooow GC pauses. Incoming rate is 4k rps per server
>> (5 servers at all), total cpu utilisation about 15% per server.
>>
>> The problem — my latency measurements show me that inside application
>> latency significantly less then outside.
>> 1. How I measure latency?
>> - I've add timings into http function handlers, and after that make
>> graphs.
>> 2. How I understood that latency inside application significantly less
>> then outside?
>> - I'm installed in front of my application the nginx server and log
>> $request_time, $upstream_response_time, after that make graphs too.
>>
>> It graphs show me that inside application latency is about 500
>> microseconds in 99 percentile, and about 10-15 milliseconds outside
>> (nginx). The nginx and my app works on the same server. My graphs show me
>> that GC occur every 30-40 seconds, and works less then 3 millisecond.
>>
>>
>> <https://lh3.googleusercontent.com/-HOZJ9iwMyyw/WM2POBUU1MI/AAAAAAAABV8/jhIV1f_PBxwPbs7fSmbqg5WJfKhB-CONgCLcB/s1600/1.png>
>>
>>
>> <https://lh3.googleusercontent.com/-Z-3-RgNcpN0/WM2PSCKXebI/AAAAAAAABWA/u-QhZs2YfzwzP6DHzu_7cT2toU-px-azACLcB/s1600/2.png>
>>
>>
>> Could someone help me find the problem and profile my application?
>>
>
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