Advantages of a large number of threads cf other approaches?

Ulf Wiger ulf.wiger@REDACTED
Thu Feb 19 18:05:06 CET 2004

On Thu, 19 Feb 2004 17:56:48 +0100, Ulf Wiger <ulf.wiger@REDACTED> 

> On Tue, 17 Feb 2004 19:51:49 -0500, Shawn Pearce <spearce@REDACTED> 
> wrote:
>> Also due to the effects of the relatively small i-cache on some 
>> processors, a well written emulator can in fact run faster than
>> native code on very big applications.  If the application has very
>> poor cache locatily in its instruction stream (randomly jumping to
>> different functions) the i-cache can have a hard time keeping up.
>> But if you move all of the code into the much larger d-cache (as
>> in the case of an emulator) you can make the emulator fly
>> as a much higher percentage of the application can be stored in the 
>> d-cache.
> Some work has been done on improving these aspects of BEAM, partly
> due to Thomas Lindgren's work on low-level profiling of AXD 301
> code, compiled with HiPE, JAM and BEAM. Björn G. took some of
> Thomas's findings to heart and improved the cache hit ratio.

Sorry, I had not intended to send that - not that it contains
sensitive or (to my knowledge) incorrect info, but I didn't
feel like I had much to add to the discussion. My mouse off
and clicked the send button before I could react.


Ulf Wiger, Senior System Architect

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