[ https://issues.apache.org/jira/browse/QPID-7666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robbie Gemmell updated QPID-7666: --------------------------------- Fix Version/s: qpid-cpp-1.37.0 Setting fix-version for 1.37.0. > [linearstore] Enhancements to the write buffer default and per-queue options > ---------------------------------------------------------------------------- > > Key: QPID-7666 > URL: https://issues.apache.org/jira/browse/QPID-7666 > Project: Qpid > Issue Type: Improvement > Components: C++ Broker > Affects Versions: qpid-cpp-1.37.0 > Reporter: Kim van der Riet > Assignee: Kim van der Riet > Fix For: qpid-cpp-1.37.0 > > > In applications where large numbers of persistent queues are created on a > single broker, control over the default and per-queue store options are > important so that resources are not wasted or become exhausted prematurely. > There are two resources of concern: > # Memory allocated per queue for buffering; > # Disk resources consumed for journal files. > Currently, the default setting for memory allocation is 1024kiB/queue (ie 32 > pages of 32kiB). The only default setting available is the page size (using > the {{wcache-page-size}} option), and the number of pages is set internally > according to the following table: > ||{{wcache-page-size}}||{{wcache-num-pages}}||total mmap|| > ||(kiB)||(set interanlly)||(kiB)|| > | 4 | 64 | 256 | > | 8 | 64 | 512| > | 16 | 32 | 512| > | 32* | 32 | 1024| > | 64 | 16 | 1024| > |128 | 8 | 1024| > \* default > This gives in effect only 3 per-queue memory allocation options: 256kiB, > 512kiB and 1024kiB. > Currently, the values of {{wcache-page-size}} is limited to the powers of 2 > between 4 and 128. > It is suggested that the {{wcache-num-pages}} value be set as as an option > rather than internally, which would give the user much greater control over > the per-queue memory footprint and the buffer geometry (which can be > optimized for the disk hardware and queue load characteristics). > In addition, the upper value limit on {{wcache-page-size}} should be removed > (as it is rather arbitrary) and the default value should be revised. > Further, it would be valuable to add these parameters to {{qpid-config}} so > that if a queue is created using this tool, the default values for the store > parameters can be overridden on a per-queue basis. > Disk resource controls are currently in place for the EFP partition > ({{efp-partition}}) and the size of the EFP files ({{efp-file-size}}), both > as a default and in {{qpid-config}}. The default values should also be > revised. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org