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A script parsing a logfile of a Ruby on Rails app to analyze where the load to the app comes from.

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rails-load-stats

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.

Usage:

./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.

Requirements:

bash version >= 4

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A script parsing a logfile of a Ruby on Rails app to analyze where the load to the app comes from.

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