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can you check if you are page faulting a lot?

@churro, do you mean that if the memory is not enough large for all the mapped segment files (or put another way, all the files are mapped to the historical process) we start to see "thrashing" of paging in and paging out?

i think the historicals download the active segments and mmap all of them, whether they are queried or not. So the OS decides which pages get cached….so i would imagine if you see a lot of page faulting, you need to adjust your memory to disk ratio.

thx, that is what I suspect. It would be great if you can share some code pointers.