On 3/30/18 4:31 PM, Per Nordlöw wrote:
I'm working on a graph database with tens of millions of small nodes
containing typically around 8-64 bytes of member data. Is there a faster
way of allocating many small class objects such as
class Node
{
// abstract members
}
class StrNode : Node
{
string value;
}
// more Node-types...
other than
const nodeCount = 10_000_000;
foreach (0 .. n)
{
auto node = new Node(someData);
// connect node...
}
You may be interested in this proposal, which was inspired by trying to
implement a reserve feature for AAs (requires a similar mechanism).
https://issues.dlang.org/show_bug.cgi?id=17881
Note that the recommendations in the replies here have the unfortunate
drawback of tying all allocations to one block, scanned by the GC all at
once, and will only get collected when none of them are referenced. On
32-bit systems this also leads to a high likelihood of false pointers
keeping the block alive.
More use cases for the feature request may help push for acceptance.
-Steve
