On Wed, 9 Jan 2013, Christoph Egger wrote:

Hi!

Faheem Mitha <fah...@faheem.info> writes:

On Wed, 9 Jan 2013, Christoph Egger wrote:

 So actually it either needs to actually dfail to allocate the memory
 or it's platform-specific. I think I get the problem on a amd64 with
 few enough memory to trigger the Heap exhaustion

Hi Christoph,

Thanks for taking a look. The developers don't seem interested. What
is dfail?

Just a d too much. In the first case the run of (main 10000) just went
through and didn't cause a heap exhaustion while the second one was on a
machine with way less memory and address-space (64bit 8GB RAM vs 32bit
1G RAM) and showed the hep exhaustion error.

Yes, I could not reproduce the problem with amd64 either. I'm not sure why. I don't think memory has much to do with it. My machine has 4G. Also, the SBCL heap size is fixed and cannot expand anyway.

The major issue is really that (gc :full t) breaks. Do you see that?

I guess so. The end of the log is below:

Yes, that looks like what I got. If you can interest any of the SBCL developers in this, please do. I think SBCL's garbage collection has major problems, but this opinion does not seem to be shared by most people.

A separate but related problem from the (gc :full t) breakage is that if large objects are allocated, then much of the time, the SBCL gc does nothing. So, of course, after a few such allocations, it runs out of room.

Thanks for your interest.
                                                           Regards, Faheem


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