How much memory does your app need to do a full compile on your machine
(for just one permutation)?
Super dev mode works very differently than legacy dev mode - I almost
prefer to call it "super draft mode" but it has more improvements than
simply running a draft compile. Legacy dev mode doesn't actually compile
your code at all, but instead spends its startup time figuring out how to
call the browser from the JVM when actual JS needs to be run, etc. In this
way, it is sort of anti-GWT, since instead of compiling anything to JS, it
is making JS callable by Java. In contrast, super dev mode actually has to
transpile everything, but actually works in modern browsers. It typically
does the basic compile on startup, then each subsequent refresh should be
much faster.
On Saturday, December 23, 2017 at 2:33:31 AM UTC-6, Ali Jalal wrote:
>
> Hi,
>
> We have a large project with about 250 KLoC client-side code (without
> comment and blank lines). This project compiles in DevMode with Xmx2500m in
> 3mins. But in SuperDevMode it throws OutOfMemoryError.
>
> *GWT Libraries:* GWT 2.8.2, gwittir, gwtchosen, gwtquery
>
> *DevMode:*
> *Compiler Arguments:* org.example.base.Base -startupUrl base -war
> /usr/jboss/standalone/deployments/base.war -noserver -logLevel ERROR -port
> 80 -nosuperDevMode -XmethodNameDisplayMode FULL -strict
>
> *VM Arguments:* -Xms2000m -Xmx2500m -XX:+UseCompressedOops
> -Djava.io.tmpdir=${TMP}/base -Dgwt.persistentunitcachedir=${TMP}/base
> -Dgwt.usearchives=true -Dgwt.disableGeneratorResultCaching
>
>
> *SuperDevMode:*
> Just change -nosuperDevMode to -superDevMode in compiler arguments.
>
> In DevMode with Xmx2500m, first compile takes about 3min, but in
> SuperDevMode with even Xmx4000m it throws OutOfMemoryError. By increasing
> Xmx to 20GB, it starts compile but never stops (it seems it needs more
> memory). So we can not use SuperDevMode in large projects. (Removing
> gwt.usearchives or gwt.disableGeneratorResultCaching has no effect.)
>
>
> My questions:
>
> 1. Why SuperDevMode should takes more memory than DevMode?
>
> 2. In small projects, SuperDevMode compile time is equal or greater than
> DevMode compile time. Is it normal?
>
> 3. How can I reduce SuperDevMode compile time?
>
> Regards,
> Ali.
>
>
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