| # ERB: | |
| # | |
| # <%= reformal_widget 'alma-by' %> | |
| # </head> | |
| # | |
| # Haml: | |
| # | |
| # = reformal_widget('alma-by') | |
| # %body | |
When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.
There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the
| Benchmark.ips do |x| | |
| x.report('exists?') { User.exists?(:id => 1) } | |
| x.report('where-any?') { User.where(:id => 1).any? } | |
| x.compare! | |
| end | |
| Comparison: | |
| exists?: 636.0 i/s | |
| where-any?: 567.1 i/s - 1.12x slower |
| Benchmark.ips do |x| | |
| x.report('exists?') { user.printers.exists? } | |
| x.report('any?') { user.printers.any? } | |
| x.compare! | |
| end | |
| Comparison: | |
| any?: 615.6 i/s | |
| exists?: 601.8 i/s - 1.02x slower |
| Benchmark.ips do |x| | |
| x.report('object comparison') { item.user == print.user } | |
| x.report('id comparison') { item.user_id == print.user_id } | |
| x.compare! | |
| end | |
| Calculating ------------------------------------- | |
| object comparison 1.204k i/100ms | |
| id comparison 1.972k i/100ms | |
| ------------------------------------------------- |
| cr-search field -> api.crossref.org field | |
| totalResults -> "message": { "total-results" | |
| startIndex -> "message": { "query": {"start-index":0 | |
| itemsPerPage -> "message": { "items-per-page":20 | |
| "query": { "searchTerms": -> "message": { "query": {"search-terms": | |
| "items": [{ "doi": -> "message": { "items": [ "DOI" | |
| "items": [{ "deposited": -> "message": { "items": [ "deposited": {"date-parts": | |
| "items": [{ "published": -> "message": { "items": [ "issued": {"date-parts": |
| // aligned/shortened/restructures response from http://api.crossref.org/funders/100000015 | |
| { | |
| "status":"ok", | |
| "message-type":"work-list", | |
| "message-version":"1.0.0", | |
| "message": { | |
| "total-results":9332, | |
| "query":{"search-terms":null,"start-index":0}, | |
| "items-per-page":20, | |
| "items": [ |
| // response from http://search.chorusaccess.org/funders/100000015/dois (cr-search app) | |
| { | |
| "totalResults": 8906, | |
| "startIndex": 0, | |
| "itemsPerPage": 20, | |
| "query": { | |
| "searchTerms": "100000015", | |
| "startPage": 1 | |
| }, | |
| "items": [ |
| get '/fundref' | |
| get '/fundref.csv' | |
| get '/chorus' | |
| get '/funders/:id/dois' | |
| get '/funders/:id/hierarchy' | |
| get '/funders/:id/hierarchy.csv' | |
| get '/funders/hierarchy' | |
| get '/funders/dois' | |
| get '/funders/prefixes' | |
| get '/funders/:id' |
