From 1a1974a27ef5ed51bed6e5471db9ae847bb95584 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Thu, 8 May 2014 11:11:25 -0700 Subject: [PATCH] cat,cp,split: use a larger buffer for copying * src/ioblksize.h (io_blksize): Double the size, to 128KB. --- src/ioblksize.h | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/src/ioblksize.h b/src/ioblksize.h index dfdaff4..264db41 100644 --- a/src/ioblksize.h +++ b/src/ioblksize.h @@ -36,20 +36,24 @@ system-1 = 1.7GHz pentium-m with 400MHz DDR2 RAM, arch=i686 system-2 = 2.1GHz i3-2310M with 1333MHz DDR3 RAM, arch=x86_64 system-3 = 3.2GHz i7-970 with 1333MHz DDR3, arch=x86_64 + system-4 = 2.20GHz Xeon E5-2660 with 1333MHz DDR3, arch=x86_64 + system-5 = 2.30GHz i7-3615QM with 1600MHz DDR3, arch=x86_64 + system-6 = 1.30GHz i5-4250U with 1-channel 1600MHz DDR3, arch=x86_64 + + blksize system-1 system-2 system-3 system-4 system-5 system-6 + ------------------------------------------------------------------------ + 1024 734 MB/s 1.7 GB/s 2.6 GB/s 642 MB/s 1.0 GB/s 2.5 GB/s + 2048 1.3 GB/s 3.0 GB/s 4.4 GB/s 1.2 GB/s 2.0 GB/s 4.4 GB/s + 4096 2.4 GB/s 5.1 GB/s 6.5 GB/s 2.3 GB/s 3.7 GB/s 7.4 GB/s + 8192 3.5 GB/s 7.3 GB/s 8.5 GB/s 4.0 GB/s 6.0 GB/s 10.4 GB/s + 16384 3.9 GB/s 9.4 GB/s 10.1 GB/s 6.3 GB/s 8.3 GB/s 13.3 GB/s + 32768 5.2 GB/s 9.9 GB/s 11.1 GB/s 8.1 GB/s 10.7 GB/s 13.2 GB/s + 65536 5.3 GB/s 11.2 GB/s 12.0 GB/s 10.6 GB/s 12.8 GB/s 16.1 GB/s + 131072 5.5 GB/s 11.8 GB/s 12.3 GB/s 12.1 GB/s 14.0 GB/s 16.7 GB/s + 262144 5.7 GB/s 11.6 GB/s 12.5 GB/s 12.3 GB/s 14.7 GB/s 16.4 GB/s + 524288 5.7 GB/s 11.4 GB/s 12.5 GB/s 12.1 GB/s 14.7 GB/s 15.5 GB/s + 1048576 5.8 GB/s 11.4 GB/s 12.6 GB/s 12.2 GB/s 14.9 GB/s 15.7 GB/s - blksize system-1 system-2 system-3 - --------------------------------------- - 1024 734 MB/s 1.7 GB/s 2.6 GB/s - 2048 1.3 GB/s 3.0 GB/s 4.4 GB/s - 4096 2.4 GB/s 5.1 GB/s 6.5 GB/s - 8192 3.5 GB/s 7.3 GB/s 8.5 GB/s - 16384 3.9 GB/s 9.4 GB/s 10.1 GB/s - 32768 5.2 GB/s 9.9 GB/s 11.1 GB/s - 65536 5.3 GB/s 11.2 GB/s 12.0 GB/s - 131072 5.5 GB/s 11.8 GB/s 12.3 GB/s - 262144 5.7 GB/s 11.6 GB/s 12.5 GB/s - 524288 5.7 GB/s 11.4 GB/s 12.5 GB/s - 1048576 5.8 GB/s 11.4 GB/s 12.6 GB/s Note that this is to minimize system call overhead. Other values may be appropriate to minimize file system @@ -64,7 +68,7 @@ In the future we could use the above method if available and default to io_blksize() if not. */ -enum { IO_BUFSIZE = 64*1024 }; +enum { IO_BUFSIZE = 128*1024 }; static inline size_t io_blksize (struct stat sb) { -- 1.9.0.rc3.9.ge265f1f