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Posted to commits@harmony.apache.org by "Naumova Natalya (JIRA)" <ji...@apache.org> on 2007/12/10 12:21:43 UTC

[jira] Created: (HARMONY-5281) mapping bootstrap jar directly into memory

mapping bootstrap jar directly into memory
------------------------------------------

                 Key: HARMONY-5281
                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
             Project: Harmony
          Issue Type: Sub-task
          Components: DRLVM
            Reporter: Naumova Natalya 


Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov updated HARMONY-5281:
----------------------------------

    Attachment: bootstrap_jar_mapping.patch

Here is a platform independent implementation of this optimization. I'm going to commit it as soon as my commit queue gets to this JIRA.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Commented: (HARMONY-5281) [drlvm][startup][performance] mapping bootstrap jars directly into memory

Posted by "Vladimir Beliaev (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564758#action_12564758 ] 

Vladimir Beliaev commented on HARMONY-5281:
-------------------------------------------

The bootstrap processing is handled by classloader module, so the JIRA is better be named as [drlvm][classloader].

> [drlvm][startup][performance] mapping bootstrap jars directly into memory
> -------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) mapping bootstrap jars directly into memory

Posted by "Naumova Natalya (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Naumova Natalya  updated HARMONY-5281:
--------------------------------------

    Attachment: jarmapping.BCP.patch

> mapping bootstrap jars directly into memory
> -------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov updated HARMONY-5281:
----------------------------------

    Summary: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory  (was: [drlvm][startup][performance] mapping bootstrap jars directly into memory)

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Assigned: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov reassigned HARMONY-5281:
-------------------------------------

    Assignee: Pavel Pervov

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Resolved: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov resolved HARMONY-5281.
-----------------------------------

    Resolution: Fixed

Committed revision 641169.

VM option vm.map_bootstrap_jars can be used to turn mmap functionality on.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) [drlvm][startup][performance] mapping bootstrap jars directly into memory

Posted by "Naumova Natalya (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Naumova Natalya  updated HARMONY-5281:
--------------------------------------

    Summary: [drlvm][startup][performance] mapping bootstrap jars directly into memory  (was: mapping bootstrap jars directly into memory)

> [drlvm][startup][performance] mapping bootstrap jars directly into memory
> -------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Commented: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Alexei Fedotov (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565375#action_12565375 ] 

Alexei Fedotov commented on HARMONY-5281:
-----------------------------------------

Hello, Natalya,
There are plenty of comments in your patch and they are hardly readable. I would really appreciate if you make some of these comments more descriptive, and remove those which may confuse a reader.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>         Attachments: jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pervov updated HARMONY-5281:
----------------------------------

    Patch Info: [Patch Available]

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Pavel Pervov <pm...@gmail.com>.
Egor,

I'm not aware of any regular measurements of Harmony memory footprint.

Pavel.

On 10 Mar 2008 18:05:51 +0300, Egor Pasko <eg...@gmail.com> wrote:
> On the 0x401 day of Apache Harmony Nathan Beyer wrote:
> > On Fri, Mar 7, 2008 at 4:46 AM, Tim Ellison <t....@gmail.com> wrote:
> > > Nataly Naumova wrote:
> > >  > I've measured the startup performance for simple applications, speedup
> > >  > was ~2-3% on simple graphics aplication with lots of AWT/SWING
> > >  > classes. But I think the idea is quite pretty, because of we get rid
> > >  > of a big amount of system calls, such as lseek, read etc. As we're
> > >  > working just with pointers directly.
> > >
> > >  Understood, but to increase the runtime footprint by 20Mb is bad IMHO.
> >
> > What's the total footprint? What was it before? The RI has a ~25M
> > footprint for general uses the last time I checked.
>
> Do we measure DRLVM footprint regularly? Is there something in BTI to
> facilitate this? Say, we can have some reference startup footprints
> like Eclipse, JEdit (more?). Did anybody compare them to RI?
>
> To detect bottlenecks it is also important to know what part of the
> footprint is heap, what is JITted code, what is other stuff. Is
> there any handy function to measure this?  (if at performance cost,
> it's OK)
>
> Offtopicly, I regularly worry about footprint impact of Jitrino
> optimizations, where inliner is most notable, you know. Looks as if
> everybody sees the picture, but not me :)
>
> --
> Egor Pasko
>
>


-- 
Pavel Pervov,
Intel Enterprise Solutions Software Division

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Egor Pasko <eg...@gmail.com>.
On the 0x401 day of Apache Harmony Nathan Beyer wrote:
> On Fri, Mar 7, 2008 at 4:46 AM, Tim Ellison <t....@gmail.com> wrote:
> > Nataly Naumova wrote:
> >  > I've measured the startup performance for simple applications, speedup
> >  > was ~2-3% on simple graphics aplication with lots of AWT/SWING
> >  > classes. But I think the idea is quite pretty, because of we get rid
> >  > of a big amount of system calls, such as lseek, read etc. As we're
> >  > working just with pointers directly.
> >
> >  Understood, but to increase the runtime footprint by 20Mb is bad IMHO.
> 
> What's the total footprint? What was it before? The RI has a ~25M
> footprint for general uses the last time I checked.

Do we measure DRLVM footprint regularly? Is there something in BTI to
facilitate this? Say, we can have some reference startup footprints
like Eclipse, JEdit (more?). Did anybody compare them to RI?

To detect bottlenecks it is also important to know what part of the
footprint is heap, what is JITted code, what is other stuff. Is
there any handy function to measure this?  (if at performance cost,
it's OK)

Offtopicly, I regularly worry about footprint impact of Jitrino
optimizations, where inliner is most notable, you know. Looks as if
everybody sees the picture, but not me :)

-- 
Egor Pasko

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Nathan Beyer <nb...@gmail.com>.
On Fri, Mar 7, 2008 at 4:46 AM, Tim Ellison <t....@gmail.com> wrote:
> Nataly Naumova wrote:
>  > I've measured the startup performance for simple applications, speedup
>  > was ~2-3% on simple graphics aplication with lots of AWT/SWING
>  > classes. But I think the idea is quite pretty, because of we get rid
>  > of a big amount of system calls, such as lseek, read etc. As we're
>  > working just with pointers directly.
>
>  Understood, but to increase the runtime footprint by 20Mb is bad IMHO.

What's the total footprint? What was it before? The RI has a ~25M
footprint for general uses the last time I checked.

-Nathan

>
>  Tim
>
>
>
>
>  > On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
>  >> Pavel Pervov (JIRA) wrote:
>  >>  > Please, note, that memory footprint of DRLVM will increase by size of
>  >>  > JRE, namely, ~20 megs.
>  >>
>  >>  Eek, that's quite significant!  What's the speed-up by doing this?
>  >>
>  >>  Regards,
>  >>  Tim
>  >>
>  >
>  >
>  >
>

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Tim Ellison <t....@gmail.com>.
Nataly Naumova wrote:
> I've measured the startup performance for simple applications, speedup
> was ~2-3% on simple graphics aplication with lots of AWT/SWING
> classes. But I think the idea is quite pretty, because of we get rid
> of a big amount of system calls, such as lseek, read etc. As we're
> working just with pointers directly.

Understood, but to increase the runtime footprint by 20Mb is bad IMHO.

Tim


> On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
>> Pavel Pervov (JIRA) wrote:
>>  > Please, note, that memory footprint of DRLVM will increase by size of
>>  > JRE, namely, ~20 megs.
>>
>>  Eek, that's quite significant!  What's the speed-up by doing this?
>>
>>  Regards,
>>  Tim
>>
> 
> 
>

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Xiao-Feng Li <xi...@gmail.com>.
On Thu, Mar 13, 2008 at 7:01 PM, Alexei Fedotov
<al...@gmail.com> wrote:
> Thanks, Pavel!
>  I believe that your idea of making a questionable option configurable
>  is the best way to resolve these concerns.

Yes,  agreed.

Thanks,
xiaofeng
>
>
>  On Tue, Mar 11, 2008 at 4:13 PM, Pavel Pervov <pm...@gmail.com> wrote:
>  > Xiao-Feng,
>  >
>  >  Yes, in the patch I've also added command line option to change that
>  >  behaviour (actually, patch _adds_ jar mapping, not _changes_ file
>  >  reads to mapping).
>  >  I made it on by default in the patch but I can change it to off before
>  >  committing and keep this functionality as a potential performance
>  >  optimization on some scenarios.
>  >
>  >  Pavel.
>  >
>  >
>  >
>  >  On 3/7/08, Xiao-Feng Li <xi...@gmail.com> wrote:
>  >  > On Fri, Mar 7, 2008 at 6:42 PM, Nataly Naumova
>  >  > <na...@gmail.com> wrote:
>  >  > > Tim,
>  >  > >
>  >  > >  I've measured the startup performance for simple applications, speedup
>  >  > >  was ~2-3% on simple graphics aplication with lots of AWT/SWING
>  >  > >  classes. But I think the idea is quite pretty, because of we get rid
>  >  > >  of a big amount of system calls, such as lseek, read etc. As we're
>  >  > >  working just with pointers directly.
>  >  >
>  >  > Can it be a runtime option chosen by the user?
>  >  >
>  >  > Thanks,
>  >  > xiaofeng
>  >  > >
>  >  > >
>  >  > >  On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
>  >  > >  > Pavel Pervov (JIRA) wrote:
>  >  > >  >  > Please, note, that memory footprint of DRLVM will increase by size of
>  >  > >  >  > JRE, namely, ~20 megs.
>  >  > >  >
>  >  > >  >  Eek, that's quite significant!  What's the speed-up by doing this?
>  >  > >  >
>  >  > >  >  Regards,
>  >  > >  >  Tim
>  >  > >  >
>  >  > >
>  >  > >
>  >  > >
>  >  > >  --
>  >  > >  Nataly Naumova,
>  >  > >  Intel Middleware Products Division
>  >  > >
>  >  >
>  >  >
>  >  >
>  >  > --
>  >  > http://xiao-feng.blogspot.com
>  >  >
>  >
>  >
>  >
>  >
>  > --
>  >  Pavel Pervov,
>  >  Intel Enterprise Solutions Software Division
>  >
>
>
>
>  --
>  With best regards,
>  Alexei
>



-- 
http://xiao-feng.blogspot.com

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Alexei Fedotov <al...@gmail.com>.
Thanks, Pavel!
I believe that your idea of making a questionable option configurable
is the best way to resolve these concerns.

On Tue, Mar 11, 2008 at 4:13 PM, Pavel Pervov <pm...@gmail.com> wrote:
> Xiao-Feng,
>
>  Yes, in the patch I've also added command line option to change that
>  behaviour (actually, patch _adds_ jar mapping, not _changes_ file
>  reads to mapping).
>  I made it on by default in the patch but I can change it to off before
>  committing and keep this functionality as a potential performance
>  optimization on some scenarios.
>
>  Pavel.
>
>
>
>  On 3/7/08, Xiao-Feng Li <xi...@gmail.com> wrote:
>  > On Fri, Mar 7, 2008 at 6:42 PM, Nataly Naumova
>  > <na...@gmail.com> wrote:
>  > > Tim,
>  > >
>  > >  I've measured the startup performance for simple applications, speedup
>  > >  was ~2-3% on simple graphics aplication with lots of AWT/SWING
>  > >  classes. But I think the idea is quite pretty, because of we get rid
>  > >  of a big amount of system calls, such as lseek, read etc. As we're
>  > >  working just with pointers directly.
>  >
>  > Can it be a runtime option chosen by the user?
>  >
>  > Thanks,
>  > xiaofeng
>  > >
>  > >
>  > >  On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
>  > >  > Pavel Pervov (JIRA) wrote:
>  > >  >  > Please, note, that memory footprint of DRLVM will increase by size of
>  > >  >  > JRE, namely, ~20 megs.
>  > >  >
>  > >  >  Eek, that's quite significant!  What's the speed-up by doing this?
>  > >  >
>  > >  >  Regards,
>  > >  >  Tim
>  > >  >
>  > >
>  > >
>  > >
>  > >  --
>  > >  Nataly Naumova,
>  > >  Intel Middleware Products Division
>  > >
>  >
>  >
>  >
>  > --
>  > http://xiao-feng.blogspot.com
>  >
>
>
>
>
> --
>  Pavel Pervov,
>  Intel Enterprise Solutions Software Division
>



-- 
With best regards,
Alexei

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Pavel Pervov <pm...@gmail.com>.
Xiao-Feng,

Yes, in the patch I've also added command line option to change that
behaviour (actually, patch _adds_ jar mapping, not _changes_ file
reads to mapping).
I made it on by default in the patch but I can change it to off before
committing and keep this functionality as a potential performance
optimization on some scenarios.

Pavel.

On 3/7/08, Xiao-Feng Li <xi...@gmail.com> wrote:
> On Fri, Mar 7, 2008 at 6:42 PM, Nataly Naumova
> <na...@gmail.com> wrote:
> > Tim,
> >
> >  I've measured the startup performance for simple applications, speedup
> >  was ~2-3% on simple graphics aplication with lots of AWT/SWING
> >  classes. But I think the idea is quite pretty, because of we get rid
> >  of a big amount of system calls, such as lseek, read etc. As we're
> >  working just with pointers directly.
>
> Can it be a runtime option chosen by the user?
>
> Thanks,
> xiaofeng
> >
> >
> >  On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
> >  > Pavel Pervov (JIRA) wrote:
> >  >  > Please, note, that memory footprint of DRLVM will increase by size of
> >  >  > JRE, namely, ~20 megs.
> >  >
> >  >  Eek, that's quite significant!  What's the speed-up by doing this?
> >  >
> >  >  Regards,
> >  >  Tim
> >  >
> >
> >
> >
> >  --
> >  Nataly Naumova,
> >  Intel Middleware Products Division
> >
>
>
>
> --
> http://xiao-feng.blogspot.com
>


-- 
Pavel Pervov,
Intel Enterprise Solutions Software Division

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Xiao-Feng Li <xi...@gmail.com>.
On Fri, Mar 7, 2008 at 6:42 PM, Nataly Naumova
<na...@gmail.com> wrote:
> Tim,
>
>  I've measured the startup performance for simple applications, speedup
>  was ~2-3% on simple graphics aplication with lots of AWT/SWING
>  classes. But I think the idea is quite pretty, because of we get rid
>  of a big amount of system calls, such as lseek, read etc. As we're
>  working just with pointers directly.

Can it be a runtime option chosen by the user?

Thanks,
xiaofeng
>
>
>  On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
>  > Pavel Pervov (JIRA) wrote:
>  >  > Please, note, that memory footprint of DRLVM will increase by size of
>  >  > JRE, namely, ~20 megs.
>  >
>  >  Eek, that's quite significant!  What's the speed-up by doing this?
>  >
>  >  Regards,
>  >  Tim
>  >
>
>
>
>  --
>  Nataly Naumova,
>  Intel Middleware Products Division
>



-- 
http://xiao-feng.blogspot.com

Re: [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Nataly Naumova <na...@gmail.com>.
Tim,

I've measured the startup performance for simple applications, speedup
was ~2-3% on simple graphics aplication with lots of AWT/SWING
classes. But I think the idea is quite pretty, because of we get rid
of a big amount of system calls, such as lseek, read etc. As we're
working just with pointers directly.

On Thu, Mar 6, 2008 at 7:45 PM, Tim Ellison <t....@gmail.com> wrote:
> Pavel Pervov (JIRA) wrote:
>  > Please, note, that memory footprint of DRLVM will increase by size of
>  > JRE, namely, ~20 megs.
>
>  Eek, that's quite significant!  What's the speed-up by doing this?
>
>  Regards,
>  Tim
>



-- 
Nataly Naumova,
Intel Middleware Products Division

[drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory (HARMONY-5281)

Posted by Tim Ellison <t....@gmail.com>.
Pavel Pervov (JIRA) wrote:
> Please, note, that memory footprint of DRLVM will increase by size of
> JRE, namely, ~20 megs.

Eek, that's quite significant!  What's the speed-up by doing this?

Regards,
Tim

[jira] Commented: (HARMONY-5281) [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory

Posted by "Pavel Pervov (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12575725#action_12575725 ] 

Pavel Pervov commented on HARMONY-5281:
---------------------------------------

Please, note, that memory footprint of DRLVM will increase by size of JRE, namely, ~20 megs.

> [drlvm][startup][performance][classloader] mapping bootstrap jars directly into memory
> --------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>            Assignee: Pavel Pervov
>         Attachments: bootstrap_jar_mapping.patch, jarmapping.BCP.patch
>
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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[jira] Updated: (HARMONY-5281) mapping bootstrap jars directly into memory

Posted by "Naumova Natalya (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HARMONY-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Naumova Natalya  updated HARMONY-5281:
--------------------------------------

    Summary: mapping bootstrap jars directly into memory  (was: mapping bootstrap jar directly into memory)

> mapping bootstrap jars directly into memory
> -------------------------------------------
>
>                 Key: HARMONY-5281
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5281
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Naumova Natalya 
>
> Bootstrap jar files mapping : we can deliver from a big amount of system calls (such as lseek, read etc) by mapping jars into memory via CreateFileMapping for windows and nmap for linux. Then we can work using pointer arithmetic only. 
> The same can be done with classlib jars also..

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