Equinox also indexes by objectClass alone. So I am not sure what the discrepancy is here. Would be nice to have the test case code to analyze. Stanley, can you post a gist with the code?
-- BJ Hargrave Senior Technical Staff Member, IBM OSGi Fellow and CTO of the OSGi Alliance hargr...@us.ibm.com office: +1 386 848 1781 mobile: +1 386 848 3788 From: "Richard S. Hall" <he...@ungoverned.org> To: Equinox development mailing list <equinox-dev@eclipse.org>, Date: 2012/05/04 13:16 Subject: Re: [equinox-dev] Service Lookup by GUID very Slow Sent by: equinox-dev-boun...@eclipse.org Just a side comment... On the Felix framework, it is technically possible to index services on arbitrary service properties, but we don't provide any configuration properties to do so. By default, we only index on objectClass, which I assume Equinox does as well. If all of your services have the same objectClass, then it will regress to a linear search. There is no other magic to make it faster in Felix. I would expect something similar in Equinox. If that is not the case, then yeah it sounds like there is an issue. -> richard On 5/4/12 12:41 , stanley_p...@dell.com wrote: Tom, You are right on. I am using a simple filter. We just added a GUID property to each service. Two follow up questions: - We ran the same tests on Felix and Knopflerfish and get 100ms response time. This is about 50X. I am wondering there may be something wrong in the environment. Do you think JVM settings like Perm generation size helps? I have Xmx=2GB, Xms=1GB and XXMaxPermSize=64MB. - Do you think lazy service creation may be the reason? Is lazy creation the default? How to configure it? - Can you outline the steps to use ServiceTrackerCustomizer to build index? Do you mean trapping the registration events and build the needed indexes? Thank you, Stanley From: equinox-dev-boun...@eclipse.org [ mailto:equinox-dev-boun...@eclipse.org] On Behalf Of Thomas Watson Sent: Friday, May 04, 2012 5:40 AM To: Equinox development mailing list Subject: Re: [equinox-dev] Service Lookup by GUID very Slow I was also not sure what you meant by GUID. After some thought I think you probably mean the service id or perhaps the service pid (service.id and service.pid properties)? And by lookup I assume you are using some kind of service filter, for example "(service.id=23)" with a call to BundleContext.getServiceReferences. I will say that the service registry is not optimized for this kind of lookup. You are far better keeping your own data structure that optimizes the lookup over the set of service references and indexes on the keys that you want to use to lookup service references. This can easily be done with a ServiceTrackerCustomizer. Tom BJ Hargrave---05/03/2012 10:04:05 PM---What is service lookup by GUID? Services don't have globally unique identifiers. Can you provide more information on the specif From: BJ Hargrave/Austin/IBM@IBMUS To: Equinox development mailing list <equinox-dev@eclipse.org>, Date: 05/03/2012 10:04 PM Subject: Re: [equinox-dev] Service Lookup by GUID very Slow What is service lookup by GUID? Services don't have globally unique identifiers. Can you provide more information on the specifics of your lookup? Such as the code snippet? -- BJ Hargrave Senior Technical Staff Member, IBM OSGi Fellow and CTO of the OSGi Alliance hargr...@us.ibm.com office: +1 386 848 1781 mobile: +1 386 848 3788 From: <stanley_p...@dell.com> To: <equinox-dev@eclipse.org>, Date: 2012/05/03 16:54 Subject: [equinox-dev] Service Lookup by GUID very Slow Sent by: equinox-dev-boun...@eclipse.org In an experiment to have 200K of services registered, the service lookup by GUID is exceedingly slow – more the 4 seconds per lookup. There are enough RAM (8G) and heap (2G) allocated. What would be the reason of the slowness of the lookup? Any settings to start the framework to improve this? Thanks, Stanley_______________________________________________ equinox-dev mailing list equinox-dev@eclipse.org https://dev.eclipse.org/mailman/listinfo/equinox-dev _______________________________________________ equinox-dev mailing list equinox-dev@eclipse.org https://dev.eclipse.org/mailman/listinfo/equinox-dev _______________________________________________ equinox-dev mailing list equinox-dev@eclipse.org https://dev.eclipse.org/mailman/listinfo/equinox-dev _______________________________________________ equinox-dev mailing list equinox-dev@eclipse.org https://dev.eclipse.org/mailman/listinfo/equinox-dev
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