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List:       konq-e
Subject:    Workaround for memory limits on iPAQ during compilation
From:       "Lawrence E. Widman" <widman () cardiothink ! com>
Date:       2001-07-09 6:38:25
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Here is the fix for the problem below:

> > I encountered the following problems while trying to compile
> > snapshot-20010702 on an iPAQ with 32 MB RAM, 1 GB microdrive
> > with 32 MB swap space, and the intimate/Debian Linux
> > distribution:
> > 
> > 1.  ./konq-embed/kdesrc/khtml/misc/helper.cpp would not
> >     compile.  The error was "compiler received signal 15",
> >     which I figured meant that memory was too small.
> 
> There's nothing I can do about this one. It's nothing that can
> be fixed source code wise. You might better cross-compile on
> a machine with more RAM ;-)

Turns out that Linux can use files for swap as well as disk
partitions.  So, the solution is (read the man page for mkswap):
  
  mkdir /swap2  (or whereever you want to put the swap file(s))
  dd if=/dev/zero of=/swap2/swapfile bs=1024 count=31000
  mkswap -f /swap2/swapfile
  /sbin/swapon /swap2/swapfile
  (more than one swapfile can be created and used.  The system
  uses however many it is given, up to N=3 at least!)

I created an extra 31 MB swap file and recompiled konqueror /
embedded. The compiler ran out of memory in helper.cpp. I
created another 31 MB swap file (total of 32 MB RAM and 94 MB
swap). The compiler ran out of memory :( . I created a 130 MB
swap file for a total of 32 MB RAM and 214 MB swap! Then I
watched top as it compiled that module. The peak memory usage
was 29.9 MB RAM and 106.7 MB swap, for a total of 136.6 MB peak
memory usage.  The only other module that came close was
khtml_part.cpp, which took a very long time to compile but
needed only 54.3MB swap plus 32MB RAM.  I now have konqueror up
and running on the iPAQ after 100% native compilation.  (The
only problem with the install was that the fonts are in
$QTDIR/etc/fonts and konqueror expects them in
$QTDIR/lib/fonts.  A simple "ln -s" takes care of that.)

After compilation is done, the swap files can be deactivated by
syncing and rebooting.  It may be safe to use swapoff, but I
don't know that for sure.  After the system is rebooted, they
won't be used unless swapon is executed again, so they can be
deleted at that point.

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