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@redhat.com