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Adding a huge zero pageAdding a huge zero pagePosted Sep 28, 2012 23:37 UTC (Fri) by khc (subscriber, #45209)In reply to: Adding a huge zero page by alankila Parent article: Adding a huge zero page
are we doing some kind of poll? :-)
MemTotal: 16327088 kB
Of course, this box has a fairly specialized daemon that allocates 8GB of memory as 2 separate pools, so it's not surprising that auto huge pages work well (although I've never measured the performance impact of that).
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Adding a huge zero page Posted Sep 29, 2012 10:28 UTC (Sat) by nix (subscriber, #2304) [Link]
Yeah, exactly. If you run things with big heaps composed of lots of little pieces (so malloc uses arena allocation and allocates >>2Mb), you'll probably do well with transparent hugepages. If instead you have lots of little programs with small heaps, you won't see any benefit: if you have programs that make lots of medium-big allocations between 512Kb and 2Mb, you'll probably see glibc malloc falling back to mmap() of regions a bit too small to be converted into a transparent hugepage.
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