Re: [Chicken-users] entry/exit to Scheme really slow on Solaris

[felix]

On 11 Aug 2003 15:23:41 +1200, Bruce Hoult <address@hidden> wrote:

> Well, I solved it.
>
> Each time Chicken does a GC (major or minor), it calls getrusage before
> and after so it can calculate the amount of CPU time used in the GC. 
> Unfortunately, this takes around 60 uS per call on this SPARC SunFire
> v120, which turns out to be about 90% of the total runtime of my
> program.
>
> With the following patch the runtime of my test program drops from 94
> seconds to 9 seconds!
>
> This turns out to be a significant improvement not only for very short
> calls into Scheme, but also for normal programs.  For example, it
> dramatically lowers all the times for nsample, especially with small
> nursery sizes:

This is indeed the case. Many thanks for pointing this out, Bruce!

I've taken the freedom to handle this somewhat differently (compared to
your patch): minor GC time is now not included in timing results (as
shown by the `time') macro, only *major* GC time.


cheers,
felix