Actually within MMTk you should use the Log class.
The Log class safely and coherently buffers output for output.
Flushing can be forced (Log.flush()).
Log is only supported within MMTk. One day we hope to have it
propogated to the rest of the VM. If you're working outside of MMTk,
you'll need to use VM.sysWriteln() as Fil mentions. However, to
achieve atomicity of output with VM.sysWrite* you'll need to fine a
single sysWrite() command that can output the format you want (fine if
you just want to output a simple string, but not good if you want to
output something complex). If the method you want isn't there, you
just need to create your own. Otherwise you won't get atomicity in
your output, which is a problem in a multithreaded setting.
--Steve
On 13/06/2009, at 12:29 AM, Filip Pizlo wrote:
> Hi Cristian,
>
> I usually use VM.sysWriteln(). You can also use VM.tsysWriteln() to
> get the thread ID prefixed to your message (useful for debugging
> multi-
> threaded stuff).
>
> -Filip
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