Alexis, Where can I find and download the said logs?
Thanks, Will On Fri, Oct 14, 2011 at 1:30 AM, Alexis <alexis.hanico...@gmail.com> wrote: > I have not read in details previous posts but would like to share some > figures on this subject. > I agree that setting max idle to automatic is very expensive, in my > case I adjusted the scheduler to get an acceptable balance between > latency and price. > > In order to do so, I've downloaded logs from the application and > studied them. > The "pending_ms" tag being important here. > > Instances graph: > http://dl.dropbox.com/u/497622/instances.png > > I changed the max idle instances from automatic to 20. > Before change: > ---------- > Out of 214903 studied requests we have: > (from 2011-10-13 09:23:07 to 2011-10-13 09:46:31) > Average ms: 303 > Pending requests: 2.4 % > Global Average pending_ms: 45 > Pending Average pending_ms: 1896 > Loading requests: 0.0 > ---------- > > > 1h after the change: > > ---------- > Out of 270115 studied requests we have: > (from 2011-10-13 11:25:56 to 2011-10-13 11:55:46) > Average ms: 345 > Pending requests: 17.3 % > Global Average pending_ms: 90 > Pending Average pending_ms: 522 > Loading requests: 0.3 > ---------- > > > > So reducing the max idle instances settings had the following impact: > - general latency increase of only 50ms > - but 17% of the requests now wait 500ms before being served > > This appears the be acceptable for our application, and the price > reduction is really worth it (from 240 instances down to 60!). > Having an even lower max idle instance setting (10? 5?) would further > increase latency while the price reduction would not be significant > (as we have many instances running). > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to google-appengine@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com. > 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 google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
