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[Bug libc/16029] New: Benchtests are inconsistent.
- From: "neleai at seznam dot cz" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 09 Oct 2013 12:04:29 +0000
- Subject: [Bug libc/16029] New: Benchtests are inconsistent.
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=16029
Bug ID: 16029
Summary: Benchtests are inconsistent.
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: neleai at seznam dot cz
CC: drepper.fsp at gmail dot com
When running make bench on ivy bridge processor a you have output for
tail benchtests/bench-strcat.out
Length 256/ 10, alignment 5/ 5: 1282.44 151.531
Length 256/ 10, alignment 5/ 5: 1279.66 148.875
Length 512/ 1, alignment 6/ 4: 2327.94 192.969
Length 512/ 1, alignment 4/ 6: 2993.31 214.375
Length 512/ 10, alignment 6/ 6: 2370.69 217.156
Length 512/ 10, alignment 6/ 6: 2369.78 215.938
Length 1024/ 1, alignment 7/ 6: 4498.62 257.25
Length 1024/ 1, alignment 6/ 7: 5808.56 319.281
Length 1024/ 10, alignment 7/ 7: 4543.91 317.406
Length 1024/ 10, alignment 7/ 7: 4544.72 315.156
and for benchtests/bench-strcat-ifunc.out
Length 256/ 10, alignment 5/ 5: 494.703 90.7031 61.6719 151.875
Length 256/ 10, alignment 5/ 5: 493.953 93.0781 60.8125 146.906
Length 512/ 1, alignment 6/ 4: 924.938 106.062 79.0469 165.844
Length 512/ 1, alignment 4/ 6: 1221.88 108.281 88.7812 226.109
Length 512/ 10, alignment 6/ 6: 939.766 116.312 89.3906 263.453
Length 512/ 10, alignment 6/ 6: 940.234 802.625 122.078 258.594
Length 1024/ 1, alignment 7/ 6: 1818.06 113.047 105.156 310.109
Length 1024/ 1, alignment 6/ 7: 2399.88 154.656 130.984 452.344
Length 1024/ 10, alignment 7/ 7: 1833.78 166.172 130.234 486.016
Length 1024/ 10, alignment 7/ 7: 1833.5 163.812 130.344 481.156
Which is quite different performance.
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