[ovirt-devel] limiting gwt compiler threads to 1

[Vojtech Szocs]

Hi Greg,

I assume you're developing against the master branch.

Your "make" command looks good, note that ThreadedPermutationWorkerFactory
is already applied [1] so there's no need to specify that in build command.

To use max. 1 thread for GWT compilation, try this:

  $ make ... DEV_EXTRA_BUILD_FLAGS="-Dgwt.compiler.localWorkers=1"

I've just tested above command for compiling GWT UI for 2 browsers:

  [INFO]    Compiling 2 permutations
  [INFO]       Compiling permutation 0...
  ... delay ...
  [INFO]       Compiling permutation 1...
  ... delay ...

[1] property "gwt-plugin.extraJvmArgs" in frontend/webadmin/modules/pom.xml

Regards,
Vojtech


----- Original Message -----
> From: "Greg Sheremeta" <gshereme at redhat.com>
> To: "Vojtech Szocs" <vszocs at redhat.com>, "Alexander Wels" <awels at redhat.com>
> Cc: devel at ovirt.org
> Sent: Thursday, May 15, 2014 3:09:17 AM
> Subject: limiting gwt compiler threads to 1
> 
> Hi,
> 
> On Fedora 20, I sometimes get GWT compiler crashes due to OutOfMemory. So I
> tried limiting to 1 thread like so:
> 
> make clean install-dev PREFIX=$HOME/ovirt-engine
> DEV_EXTRA_BUILD_FLAGS_GWT_DEFAULTS="-Dgwt.userAgent=gecko1_8,safari"
> BUILD_UT=0 DEV_EXTRA_BUILD_FLAGS="-Dgwt.jjs.maxThreads=1
> -Dgwt.jjs.permutationWorkerFactory=com.google.gwt.dev.ThreadedPermutationWorkerFactory"
> 
> When the two compiler threads spawn, they seem to fire at the same time.
> 
> [INFO]    Compiling 2 permutations
> [INFO]       Compiling permutation 0...
> [INFO]       Compiling permutation 1...
> 
> I would expect there to be a delay while 1 waits for 0:
> 
> [INFO]    Compiling 2 permutations
> [INFO]       Compiling permutation 0...
> <30 second pause...>   <done>
> [INFO]       Compiling permutation 1...
> <30 second pause...>   <done>
> 
> Do I have the options wrong?
> 
> Greg
> 
> Greg Sheremeta
> Red Hat, Inc.
> Sr. Software Engineer, RHEV
> Cell: 919-807-1086
> gshereme at redhat.com
>