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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4282) Improve startup time by making row cache population multi threaded
Date Fri, 25 May 2012 09:06:23 GMT
Marcus Eriksson created CASSANDRA-4282:
------------------------------------------

             Summary: Improve startup time by making row cache population multi threaded
                 Key: CASSANDRA-4282
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4282
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Marcus Eriksson
            Priority: Minor
             Fix For: 1.2


Attached patch multi threads the row cache population

my small tests show improvements atleast;

{code}
- 4 cores                                                                                
                                                                                         
                   
- 11G stress-generated data
- page cache dropped between runs                                                        
                                                                                         
                         
                                                                                         
                                                                                         
                   
single platter spinning disk:                                                            
                                                                                      
single threaded:                                                                         
                                                                                         
                   
 INFO 10:18:21,365 completed loading (245562 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
 INFO 10:32:43,738 completed loading (255106 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
multi threaded:                                                                          
                                                                                         
                   
 INFO 10:22:47,567 completed loading (213905 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
 INFO 10:27:26,873 completed loading (214514 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
                                                                                         
                                                                                         
                   
ssd;                                                                                     
                                                                                         
                   
single threaded:                                                                         
                                                                                         
                   
 INFO 10:40:49,079 completed loading (103883 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
 INFO 10:43:45,799 completed loading (106913 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
             
multi threaded:                                                                          
                                                                                         
                   
 INFO 10:38:20,798 completed loading (57617 ms; 311381 keys) row cache for Keyspace1.Standard1
                                                                                         
              
 INFO 10:47:20,339 completed loading (56682 ms; 311381 keys) row cache for Keyspace1.Standard1
{code}

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