Re: [nhc-users] Maximum Heap Size

Arunkumar S Jadhav writes:

Am I right in assuming that nhc98 uses only 29 (out of possible 32) bits for addressing. Because, the top bit is used for ZAP, and least two bits are used to differentiate between various data nodes and so on.

Yes. (However, we are thinking about changing the representation of the ZAP information to free-up the top bit, and see below for the other two bits.)

If this is the case then, we can't allocate more than 2^29 bytes or 2^27 (i.e 128 Mega Words) words for the total heap size

No. A heap pointer is always aligned to a 4-byte boundary, which is why we can use the bottom two bits for other purposes. Thus, the maximum heap size is indeed 2^31 bytes = 2^29 words. Regards, Malcolm