[Engine-devel] GWT Dev Mode unbearably slow in WebAdmin

Fri Mar 21 14:11:38 UTC 2014

----- Original Message -----
> From: "Greg Sheremeta" <gshereme at redhat.com>
> To: "Vojtech Szocs" <vszocs at redhat.com>
> Cc: "engine-devel" <engine-devel at ovirt.org>
> Sent: Friday, March 21, 2014 3:04:17 PM
> Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in WebAdmin
> 
> 
> ----- Original Message -----
> > From: "Vojtech Szocs" <vszocs at redhat.com>
> > To: "Greg Sheremeta" <gshereme at redhat.com>
> > Cc: "engine-devel" <engine-devel at ovirt.org>
> > Sent: Friday, March 21, 2014 9:57:00 AM
> > Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in WebAdmin
> > 
> > 
> > 
> > ----- Original Message -----
> > > From: "Greg Sheremeta" <gshereme at redhat.com>
> > > To: "engine-devel" <engine-devel at ovirt.org>
> > > Sent: Friday, March 21, 2014 1:32:54 AM
> > > Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in WebAdmin
> > > 
> > > I'm afraid I need to resurrect this. I'm again seeing unbearable slowness
> > > with GWT Dev Mode in webadmin on master. The first load is tolerable, and
> > > one or two refreshes are ok, but after that it bogs down and is unusable.
> > 
> > Some suggestions (that have been already mentioned in this thread a while
> > ago):
> > 
> > 1, use gwt-maven-plugin 2.5.1 instead of 2.4.0
> >    in root pom.xml change
> >    <gwt-maven-plugin.workingRefresh.version>2.4.0</gwt-maven-plugin.workingRefresh.version>
> >    to
> >    <gwt-maven-plugin.workingRefresh.version>${gwt.version}</gwt-maven-plugin.workingRefresh.version>
> > 
> > 2, disable GWT persistent unit cache
> >    in frontend/webadmin/modules/pom.xml find
> >    <artifactId>gwt-maven-plugin</artifactId>
> >    add <persistentunitcache>false</persistentunitcache> to <configuration>
> >    -or-
> >    make gwt-debug [usual options]
> >    DEV_EXTRA_BUILD_FLAGS="-Dgwt.persistentunitcache=false"
> > 
> > 3, try out GWT Super Dev Mode
> > 
> > Vojtech
> 
> Vojtech, you're not experiencing this slowness?

In fact, I am .. (and I have quite powerful laptop)

The slowness is a combination of two factors, lots of UI code (for GWT compiler to process) + on-the-fly recompilation of GWT Dev Mode. The "lots of code" factor should be improved when we transition to REST API and introduce other UI improvements (like alternative/dynamic i18n implementation, possibly UiCommon code refactoring, etc).

I've seen that people tend to use Super Dev Mode for basic debugging, falling back to Classic (slow) Dev Mode for deeper debugging. (So far, I didn't have time to try out Super Dev Mode myself.)

> 
> 
> > 
> > > 
> > > Anyone else?
> > > 
> > > Greg
> > > 
> > > 
> > > ----- Original Message -----
> > > > From: "Greg Sheremeta" <gshereme at redhat.com>
> > > > To: awels at redhat.com
> > > > Cc: "engine-devel" <engine-devel at ovirt.org>
> > > > Sent: Thursday, February 27, 2014 9:26:40 AM
> > > > Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in WebAdmin
> > > > 
> > > > Thanks, and great work figuring it out :)
> > > > 
> > > > Greg
> > > > 
> > > > ----- Original Message -----
> > > > > From: "Alexander Wels" <awels at redhat.com>
> > > > > To: "Greg Sheremeta" <gshereme at redhat.com>
> > > > > Cc: "Lior Vernia" <lvernia at redhat.com>, "Martin Betak"
> > > > > <mbetak at redhat.com>,
> > > > > "engine-devel" <engine-devel at ovirt.org>,
> > > > > "Vojtech Szocs" <vszocs at redhat.com>
> > > > > Sent: Thursday, February 27, 2014 8:32:00 AM
> > > > > Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in WebAdmin
> > > > > 
> > > > > Master is back to its normal zippy self in GWT dev mode as of 8:25
> > > > > EST
> > > > > Feb
> > > > > 27th 2014. With relative values for zippy. If you are annoyed by the
> > > > > slow
> > > > > GTW
> > > > > dev mode be sure to fetch and rebase.
> > > > > 
> > > > > On Wednesday, February 19, 2014 10:51:06 AM Greg Sheremeta wrote:
> > > > > > I agree with Lior. Alexander (cc'd) has a patch that will hopefully
> > > > > > address
> > > > > > it.
> > > > > > 
> > > > > > Greg
> > > > > > 
> > > > > > ----- Original Message -----
> > > > > > 
> > > > > > > From: "Lior Vernia" <lvernia at redhat.com>
> > > > > > > To: "Martin Betak" <mbetak at redhat.com>
> > > > > > > Cc: "Greg Sheremeta" <gshereme at redhat.com>, "engine-devel"
> > > > > > > <engine-devel at ovirt.org>, "Vojtech Szocs" <vszocs at redhat.com>
> > > > > > > Sent: Wednesday, February 19, 2014 10:27:51 AM
> > > > > > > Subject: Re: [Engine-devel] GWT Dev Mode unbearably slow in
> > > > > > > WebAdmin
> > > > > > > 
> > > > > > > Hi guys,
> > > > > > > 
> > > > > > > On 17/02/14 13:15, Martin Betak wrote:
> > > > > > > > Yes, this has been my developer experience since I joined the
> > > > > > > > project.
> > > > > > > 
> > > > > > > To my eyes, it hasn't always been this slow. Something aggravated
> > > > > > > the
> > > > > > > situation sometime in the past 3 weeks. I'm not knowledgeable
> > > > > > > enough
> > > > > > > to
> > > > > > > say what went wrong, but this is not simply a gradual degradation
> > > > > > > of
> > > > > > > more code being compiled, etc.
> > > > > > > 
> > > > > > > Lior.
> > > > > > > 
> > > > > > > > The 5-6 minute page-loads are a standard but the GWT Dev Mode
> > > > > > > > gets
> > > > > > > > progressively
> > > > > > > > slower after each "refresh" that involves frontend
> > > > > > > > recompilation.
> > > > > > > > Also
> > > > > > > > the
> > > > > > > > memory
> > > > > > > > consumption increases and after 5-th "refresh" or so I have to
> > > > > > > > kill
> > > > > > > > it
> > > > > > > > and
> > > > > > > > recompile the whole engine.
> > > > > > > > 
> > > > > > > > Any improvement to current status would be much appreciated.
> > > > > > > > 
> > > > > > > > Martin
> > > > > > > > 
> > > > > > > > 
> > > > > > > > 
> > > > > > > > ----- Original Message -----
> > > > > > > > 
> > > > > > > >> From: "Greg Sheremeta" <gshereme at redhat.com>
> > > > > > > >> To: "engine-devel" <engine-devel at ovirt.org>
> > > > > > > >> Sent: Friday, February 14, 2014 4:50:46 PM
> > > > > > > >> Subject: [Engine-devel] GWT Dev Mode unbearably slow in
> > > > > > > >> WebAdmin
> > > > > > > >> 
> > > > > > > >> Has anyone else noticed that GWT Dev Mode is unbearably slow
> > > > > > > >> for
> > > > > > > >> WebAdmin?
> > > > > > > >> On
> > > > > > > >> my machine, it's to the point where I might as well rebuild
> > > > > > > >> the
> > > > > > > >> entire
> > > > > > > >> application for every change and not bother with Dev Mode.
> > > > > > > >> Pages
> > > > > > > >> take
> > > > > > > >> 4
> > > > > > > >> or
> > > > > > > >> 5
> > > > > > > >> minutes to render. Sometimes after 5 minutes, I just give up,
> > > > > > > >> close
> > > > > > > >> everything, and rebuild the app.
> > > > > > > >> 
> > > > > > > >> For now, I want to see if others have this issue. If we
> > > > > > > >> confirm
> > > > > > > >> that
> > > > > > > >> it's
> > > > > > > >> widespread, we can discuss ways to mitigate.
> > > > > > > >> 
> > > > > > > >> Greg Sheremeta
> > > > > > > >> Red Hat, Inc.
> > > > > > > >> Sr. Software Engineer, RHEV
> > > > > > > >> Cell: 919-807-1086
> > > > > > > >> gshereme at redhat.com
> > > > > > > >> _______________________________________________
> > > > > > > >> Engine-devel mailing list
> > > > > > > >> Engine-devel at ovirt.org
> > > > > > > >> http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > > > > > > 
> > > > > > > > _______________________________________________
> > > > > > > > Engine-devel mailing list
> > > > > > > > Engine-devel at ovirt.org
> > > > > > > > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > > > 
> > > > > 
> > > > _______________________________________________
> > > > Engine-devel mailing list
> > > > Engine-devel at ovirt.org
> > > > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > > 
> > > _______________________________________________
> > > Engine-devel mailing list
> > > Engine-devel at ovirt.org
> > > http://lists.ovirt.org/mailman/listinfo/engine-devel
> > > 
> > 
> 