Are you seeing the average response time / latency of the cache from
outside?
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.
--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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