I recently migrated to endpoints framework version 2 and started paying
closer attention to latency. In my case I have a very low traffic app. I
even tried just using the standard python echo example found here:
https://cloud.google.com/endpoints/docs/frameworks/python/get-started-frameworks-python
So in my case I made sure one backend instance is running and then I
started issuing basic requests via curl. I also see large unexplained gaps
in my appstats and the corresponding log latency is much lower than the
actual latency reported by curl. The unexplained latency overhead is very
sporadic and ranges from 200ms to 1.3 seconds. Is this just the nature of
cloud endpoints framework api? Here are some examples:
MacBook-Pro$ curl -H "Content-Type: application/json" -X POST -d
'{"content":"hello world"}'
https://testtictactoe-164905.appspot.com/_ah/api/echo/v1/echo -w
"@curl-format.txt"
{
"content": "hello world"
}
time_namelookup: 0.005
time_connect: 0.019
time_appconnect: 0.143
time_pretransfer: 0.144
time_redirect: 0.000
time_starttransfer: 0.660
--------
time_total: 0.660
MacBook-Pro$ curl -H "Content-Type: application/json" -X POST -d
'{"content":"hello world"}'
https://testtictactoe-164905.appspot.com/_ah/api/echo/v1/echo -w
"@curl-format.txt"
{
"content": "hello world"
}
time_namelookup: 0.005
time_connect: 0.021
time_appconnect: 0.145
time_pretransfer: 0.145
time_redirect: 0.000
time_starttransfer: 1.028
--------
time_total: 1.028
MacBook-Pro$ curl -H "Content-Type: application/json" -X POST -d
'{"content":"hello world"}'
https://testtictactoe-164905.appspot.com/_ah/api/echo/v1/echo -w
"@curl-format.txt"
{
"content": "hello world"
}
time_namelookup: 0.528
time_connect: 0.542
time_appconnect: 0.668
time_pretransfer: 0.668
time_redirect: 0.000
time_starttransfer: 0.912
--------
time_total: 0.912
MacBook-Pro$ curl -H "Content-Type: application/json" -X POST -d
'{"content":"hello world"}'
https://testtictactoe-164905.appspot.com/_ah/api/echo/v1/echo -w
"@curl-format.txt"
{
"content": "hello world"
}
time_namelookup: 0.005
time_connect: 0.019
time_appconnect: 0.141
time_pretransfer: 0.141
time_redirect: 0.000
time_starttransfer: 0.903
--------
time_total: 0.903
MacBook-Pro$ curl -H "Content-Type: application/json" -X POST -d
'{"content":"hello world"}'
https://testtictactoe-164905.appspot.com/_ah/api/echo/v1/echo -w
"@curl-format.txt"
{
"content": "hello world"
}
time_namelookup: 0.005
time_connect: 0.018
time_appconnect: 0.151
time_pretransfer: 0.151
time_redirect: 0.000
time_starttransfer: 1.597
--------
time_total: 1.597
On Friday, July 29, 2016 at 12:29:44 PM UTC-7, Christian Foster Howes wrote:
>
> looks like the pending MS logs mystery was solved:
> https://groups.google.com/forum/#!topic/google-appengine/8mHxjsSCOYc so
> if you don't see that in your logs you can rule that out as a problem.
>
> On Friday, July 29, 2016 at 10:04:47 AM UTC-7, Christian F. Howes wrote:
>>
>> A helpful stat would be the "pending latency" (the amount of time that
>> the request waited for an available instance to run on). This was part
>> of the logs in the old log viewer and is missing is the new log viewer.
>> i believe someone has filed an issue requesting that it be re-added.
>>
>> if any of your requests are cacheable, setting proper cache headers will
>> trigger google's edge cache and dramatically reduce server side latency
>> as well.
>>
>>
>>
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