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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