Rails-load-stats is a simple bash script that processes a logfile of any Ruby on Rails app to analyze where the load to the app comes from. It produces statistics about:
- Particular requests: how many requests against each method were raised, how much (min/max/avg/sum) time these took, and what percentage of overall execution time was spent by processing the different types of requests.
- Level of concurrency: how many requests were processed in parallel, what was the max/avg/mean/90%percentile. This helps with scaling your app.
Example output (from a foreman deployment):
there were 3196 requests taking 782320 ms (i.e. 0.22 hours, i.e. 0.01 days) in summary
type count min max avg mean sum percentage
--------------------------------------------------------------------------------------------------------------------
HostsController#externalNodes 220 233 969 471 429 103832 13.27 %
HostsController#facts 147 29 2912 671 777 98675 12.61 %
DashboardController#show 84 52 11378 881 318 74057 9.47 %
JobInvocationsController#show 573 52 508 88 77 50705 6.48 %
HostsController#get_power_state 154 24 3033 267 69 41150 5.26 %
SyncManagementController#index 4 8314 10158 9367 9188 37470 4.79 %
ProductsController#index 2 13196 17166 15181 13196 30362 3.88 %
CandlepinProxiesController#get 432 35 583 69 52 30124 3.85 %
..
..
..ontroller#puppet_environment_for_content_view 1 30 30 30 30 30 0.00 %
concurrent requests:
- MAX: 60 when processing request with ID 0b5552e0
- AVG: 29
- MEAN: 33
- 90%PERCENTILE: 50
Results are stored in results.* files, individual requests per each type are available in times.* files, numbers of concurrently processed requests at a time in concur-requests.txt. Method names have stripped class namespaces - just in the table.
./analyze.sh logfile [sort-results]
where (optional) sort-results can be a value from 2 to 7 determining column to sort the results by. By default, results are sorted alhpabeticaly by method names.
bash version >= 4