You only get the benefit of threads if you have unused CPU cycles. If you are only spending .1% of the time waiting on API's than you don't have any "Spare" CPU to start on the next task.
Your app will perform as you said, instances will queue up and the first request will take the same amount of time as it did before, the second request will take twice as long, and so your average will be 50% longer than it was on 2.5. You might test F2 instances with thread safe. In some cases we have found these to be Significantly faster for Request 1. With F1 and thread safe you would see 100Ms for 1st request 200MS (100+100) for 2nd request. Average 150ms With F1 With out thread safe 2 instances would handle requests in 95ms F2 With Thread Safe 50MS for 1st Request 100MS for 2nd Request Average 75MS This F2 Time is As a Result Faster, and The same Price if not Cheaper than the F1's with out thread safe. From: [email protected] [mailto:[email protected]] On Behalf Of Felippe Bueno Sent: Thursday, March 08, 2012 3:35 PM To: [email protected] Subject: Re: [google-appengine] My expirencie with python 2.7 and others Thanks for your answer Brandon. Let me see if I understand. I'm like only 0.1% API calls CPU. You are saying that threadsafe is not a good idea to me ? I mean, instances were cuted to half, but latency was the double of python 2.5. Thanks again. On Thu, Mar 8, 2012 at 7:27 PM, Brandon Wirtz <[email protected]> wrote: >I need to choose between, save money (half of instances) or run fast. That should make sense, but in my opinion, >python 2.7 should comes to save us money, running at same speed of python 2.5. >Am I wrong ? Yes you are wrong. Thread safe only saves you money if you are waiting on API's enough to save money. If you look at your Dashboard and 85% of your CPU usage is API's you will likely go faster and save money with Thread safe. if you are 85% CPU, unless you always have 10 instances you may save a little money but you will go slower. If you are at 50% API's and always have 20 instances, thread safe will make you a lot faster and cut your bill in half. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected] <mailto:google-appengine%[email protected]> . For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
