From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 29 Aug 2006 21:26:58 -0700 (PDT) From: Christoph Lameter Subject: Re: libnuma interleaving oddness In-Reply-To: <20060830022621.GA5195@us.ibm.com> Message-ID: References: <20060829231545.GY5195@us.ibm.com> <20060830002110.GZ5195@us.ibm.com> <20060830022621.GA5195@us.ibm.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Nishanth Aravamudan Cc: ak@suse.de, linux-mm@kvack.org, linuxppc-dev@ozlabs.org, lnxninja@us.ibm.com, agl@us.ibm.com List-ID: On Tue, 29 Aug 2006, Nishanth Aravamudan wrote: > If I use the default hugepage-aligned hugepage-backed malloc > replacement, I get the following in /proc/pid/numa_maps (excerpt): > > 20000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.3JbO7R\040(deleted) huge dirty=1 N0=1 > 21000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.3JbO7R\040(deleted) huge dirty=1 N0=1 > ... > 37000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.3JbO7R\040(deleted) huge dirty=1 N0=1 > 38000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.3JbO7R\040(deleted) huge dirty=1 N0=1 Is this with nodemask set to [0]? > If I change the nodemask to 1-7, I get: > > 20000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N1=1 > 21000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N2=1 > 22000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N3=1 > 23000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N4=1 > 24000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N5=1 > 25000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N6=1 > 26000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N7=1 > ... > 35000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N1=1 > 36000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N2=1 > 37000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N3=1 > 38000000 interleave=1-7 file=/libhugetlbfs/libhugetlbfs.tmp.Eh9Bmp\040(deleted) huge dirty=1 N4=1 So interleave has an effect. Are you using cpusets? Or are you only using memory policies? What is the default policy of the task you are running? > If I then change our malloc implementation to (unnecessarily) mmap a > size aligned to 4 hugepages, rather aligned to a single hugepage, but > using a nodemask of 0-7, I get: > > 20000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 24000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 28000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 2c000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 30000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 34000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=4 N0=1 N1=1 N2=1 N3=1 > 38000000 interleave=0-7 file=/libhugetlbfs/libhugetlbfs.tmp.PFt0xt\040(deleted) huge dirty=1 mapped=4 N0=1 N1=1 N2=1 N3=1 Hmm... Strange. Interleaving should continue after the last one.... -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org