pinned memory

[nam2934]

Hi,
I'm curious to know whether HeavyDB employs pinned memory.
From my perspective, utilizing pinned memory appears to offer advantages in terms of H2D data transfer.
If HeavyDB doesn't use pinned memory, could you kindly share any specific reasons behind this decision?

Thank you.

[cdessanti]

Hi,
In the past, we had a specific option for using pinned memory. However, it was dropped due to issues like memory fragmentation and OOM killer intervention. C
urrently, there is negligible performance difference between pinned and regular memory when using a single GPU. Some serialization issues in the software also render the use of this memory type impractical, particularly when employing multiple GPUs.

Despite this, we are planning to reintroduce the usage of this memory for specific narrow scopes in the near future.

Regards,
Candido