Monthly Archives: October 2016

Liner Regression — an example

Assume we have sample points: (1, 2), (2, 4), (3 ,5), (4, 4), (5, 5).

Then we have table
linear5

we will calculate: y = b0 + b1x
linear21

So, we have

Proof of OLS: link1, link2

A web service is deployed in GAE(google app engine). This is the loading test on GAE with different core, concurrency combinations.

1 core, 1 thread, 0.3s per reqeust

1 core, 160 threads, 12s per request

1 core, 150 threads, 8s per request

8 core, 50 threads, 5s per request

16 core, 50 threads, 3s per request

Google App Engine doesn’t support multi-thread of the application, such as multiprocessing in python.

Each GAE supports maximum of 16 cores. If we want to auto-scale, we should read google API and design properly.